linux/arch/sparc/mm/sun4c.c
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   1/* sun4c.c: Doing in software what should be done in hardware.
   2 *
   3 * Copyright (C) 1996 David S. Miller (davem@davemloft.net)
   4 * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
   5 * Copyright (C) 1996 Andrew Tridgell (Andrew.Tridgell@anu.edu.au)
   6 * Copyright (C) 1997-2000 Anton Blanchard (anton@samba.org)
   7 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   8 */
   9
  10#define NR_TASK_BUCKETS 512
  11
  12#include <linux/kernel.h>
  13#include <linux/mm.h>
  14#include <linux/init.h>
  15#include <linux/bootmem.h>
  16#include <linux/highmem.h>
  17#include <linux/fs.h>
  18#include <linux/seq_file.h>
  19#include <linux/scatterlist.h>
  20
  21#include <asm/page.h>
  22#include <asm/pgalloc.h>
  23#include <asm/pgtable.h>
  24#include <asm/vaddrs.h>
  25#include <asm/idprom.h>
  26#include <asm/machines.h>
  27#include <asm/memreg.h>
  28#include <asm/processor.h>
  29#include <asm/auxio.h>
  30#include <asm/io.h>
  31#include <asm/oplib.h>
  32#include <asm/openprom.h>
  33#include <asm/mmu_context.h>
  34#include <asm/sun4paddr.h>
  35#include <asm/highmem.h>
  36#include <asm/btfixup.h>
  37#include <asm/cacheflush.h>
  38#include <asm/tlbflush.h>
  39
  40/* Because of our dynamic kernel TLB miss strategy, and how
  41 * our DVMA mapping allocation works, you _MUST_:
  42 *
  43 * 1) Disable interrupts _and_ not touch any dynamic kernel
  44 *    memory while messing with kernel MMU state.  By
  45 *    dynamic memory I mean any object which is not in
  46 *    the kernel image itself or a thread_union (both of
  47 *    which are locked into the MMU).
  48 * 2) Disable interrupts while messing with user MMU state.
  49 */
  50
  51extern int num_segmaps, num_contexts;
  52
  53extern unsigned long page_kernel;
  54
  55#ifdef CONFIG_SUN4
  56#define SUN4C_VAC_SIZE sun4c_vacinfo.num_bytes
  57#else
  58/* That's it, we prom_halt() on sun4c if the cache size is something other than 65536.
  59 * So let's save some cycles and just use that everywhere except for that bootup
  60 * sanity check.
  61 */
  62#define SUN4C_VAC_SIZE 65536
  63#endif
  64
  65#define SUN4C_KERNEL_BUCKETS 32
  66
  67/* Flushing the cache. */
  68struct sun4c_vac_props sun4c_vacinfo;
  69unsigned long sun4c_kernel_faults;
  70
  71/* Invalidate every sun4c cache line tag. */
  72static void __init sun4c_flush_all(void)
  73{
  74        unsigned long begin, end;
  75
  76        if (sun4c_vacinfo.on)
  77                panic("SUN4C: AIEEE, trying to invalidate vac while it is on.");
  78
  79        /* Clear 'valid' bit in all cache line tags */
  80        begin = AC_CACHETAGS;
  81        end = (AC_CACHETAGS + SUN4C_VAC_SIZE);
  82        while (begin < end) {
  83                __asm__ __volatile__("sta %%g0, [%0] %1\n\t" : :
  84                                     "r" (begin), "i" (ASI_CONTROL));
  85                begin += sun4c_vacinfo.linesize;
  86        }
  87}
  88
  89static void sun4c_flush_context_hw(void)
  90{
  91        unsigned long end = SUN4C_VAC_SIZE;
  92
  93        __asm__ __volatile__(
  94                "1:     addcc   %0, -4096, %0\n\t"
  95                "       bne     1b\n\t"
  96                "        sta    %%g0, [%0] %2"
  97        : "=&r" (end)
  98        : "0" (end), "i" (ASI_HWFLUSHCONTEXT)
  99        : "cc");
 100}
 101
 102/* Must be called minimally with IRQs disabled. */
 103static void sun4c_flush_segment_hw(unsigned long addr)
 104{
 105        if (sun4c_get_segmap(addr) != invalid_segment) {
 106                unsigned long vac_size = SUN4C_VAC_SIZE;
 107
 108                __asm__ __volatile__(
 109                        "1:     addcc   %0, -4096, %0\n\t"
 110                        "       bne     1b\n\t"
 111                        "        sta    %%g0, [%2 + %0] %3"
 112                        : "=&r" (vac_size)
 113                        : "0" (vac_size), "r" (addr), "i" (ASI_HWFLUSHSEG)
 114                        : "cc");
 115        }
 116}
 117
 118/* File local boot time fixups. */
 119BTFIXUPDEF_CALL(void, sun4c_flush_page, unsigned long)
 120BTFIXUPDEF_CALL(void, sun4c_flush_segment, unsigned long)
 121BTFIXUPDEF_CALL(void, sun4c_flush_context, void)
 122
 123#define sun4c_flush_page(addr) BTFIXUP_CALL(sun4c_flush_page)(addr)
 124#define sun4c_flush_segment(addr) BTFIXUP_CALL(sun4c_flush_segment)(addr)
 125#define sun4c_flush_context() BTFIXUP_CALL(sun4c_flush_context)()
 126
 127/* Must be called minimally with interrupts disabled. */
 128static void sun4c_flush_page_hw(unsigned long addr)
 129{
 130        addr &= PAGE_MASK;
 131        if ((int)sun4c_get_pte(addr) < 0)
 132                __asm__ __volatile__("sta %%g0, [%0] %1"
 133                                     : : "r" (addr), "i" (ASI_HWFLUSHPAGE));
 134}
 135
 136/* Don't inline the software version as it eats too many cache lines if expanded. */
 137static void sun4c_flush_context_sw(void)
 138{
 139        unsigned long nbytes = SUN4C_VAC_SIZE;
 140        unsigned long lsize = sun4c_vacinfo.linesize;
 141
 142        __asm__ __volatile__(
 143        "add    %2, %2, %%g1\n\t"
 144        "add    %2, %%g1, %%g2\n\t"
 145        "add    %2, %%g2, %%g3\n\t"
 146        "add    %2, %%g3, %%g4\n\t"
 147        "add    %2, %%g4, %%g5\n\t"
 148        "add    %2, %%g5, %%o4\n\t"
 149        "add    %2, %%o4, %%o5\n"
 150        "1:\n\t"
 151        "subcc  %0, %%o5, %0\n\t"
 152        "sta    %%g0, [%0] %3\n\t"
 153        "sta    %%g0, [%0 + %2] %3\n\t"
 154        "sta    %%g0, [%0 + %%g1] %3\n\t"
 155        "sta    %%g0, [%0 + %%g2] %3\n\t"
 156        "sta    %%g0, [%0 + %%g3] %3\n\t"
 157        "sta    %%g0, [%0 + %%g4] %3\n\t"
 158        "sta    %%g0, [%0 + %%g5] %3\n\t"
 159        "bg     1b\n\t"
 160        " sta   %%g0, [%1 + %%o4] %3\n"
 161        : "=&r" (nbytes)
 162        : "0" (nbytes), "r" (lsize), "i" (ASI_FLUSHCTX)
 163        : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc");
 164}
 165
 166/* Don't inline the software version as it eats too many cache lines if expanded. */
 167static void sun4c_flush_segment_sw(unsigned long addr)
 168{
 169        if (sun4c_get_segmap(addr) != invalid_segment) {
 170                unsigned long nbytes = SUN4C_VAC_SIZE;
 171                unsigned long lsize = sun4c_vacinfo.linesize;
 172
 173                __asm__ __volatile__(
 174                "add    %2, %2, %%g1\n\t"
 175                "add    %2, %%g1, %%g2\n\t"
 176                "add    %2, %%g2, %%g3\n\t"
 177                "add    %2, %%g3, %%g4\n\t"
 178                "add    %2, %%g4, %%g5\n\t"
 179                "add    %2, %%g5, %%o4\n\t"
 180                "add    %2, %%o4, %%o5\n"
 181                "1:\n\t"
 182                "subcc  %1, %%o5, %1\n\t"
 183                "sta    %%g0, [%0] %6\n\t"
 184                "sta    %%g0, [%0 + %2] %6\n\t"
 185                "sta    %%g0, [%0 + %%g1] %6\n\t"
 186                "sta    %%g0, [%0 + %%g2] %6\n\t"
 187                "sta    %%g0, [%0 + %%g3] %6\n\t"
 188                "sta    %%g0, [%0 + %%g4] %6\n\t"
 189                "sta    %%g0, [%0 + %%g5] %6\n\t"
 190                "sta    %%g0, [%0 + %%o4] %6\n\t"
 191                "bg     1b\n\t"
 192                " add   %0, %%o5, %0\n"
 193                : "=&r" (addr), "=&r" (nbytes), "=&r" (lsize)
 194                : "0" (addr), "1" (nbytes), "2" (lsize),
 195                  "i" (ASI_FLUSHSEG)
 196                : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc");
 197        }
 198}
 199
 200/* Don't inline the software version as it eats too many cache lines if expanded. */
 201static void sun4c_flush_page_sw(unsigned long addr)
 202{
 203        addr &= PAGE_MASK;
 204        if ((sun4c_get_pte(addr) & (_SUN4C_PAGE_NOCACHE | _SUN4C_PAGE_VALID)) ==
 205            _SUN4C_PAGE_VALID) {
 206                unsigned long left = PAGE_SIZE;
 207                unsigned long lsize = sun4c_vacinfo.linesize;
 208
 209                __asm__ __volatile__(
 210                "add    %2, %2, %%g1\n\t"
 211                "add    %2, %%g1, %%g2\n\t"
 212                "add    %2, %%g2, %%g3\n\t"
 213                "add    %2, %%g3, %%g4\n\t"
 214                "add    %2, %%g4, %%g5\n\t"
 215                "add    %2, %%g5, %%o4\n\t"
 216                "add    %2, %%o4, %%o5\n"
 217                "1:\n\t"
 218                "subcc  %1, %%o5, %1\n\t"
 219                "sta    %%g0, [%0] %6\n\t"
 220                "sta    %%g0, [%0 + %2] %6\n\t"
 221                "sta    %%g0, [%0 + %%g1] %6\n\t"
 222                "sta    %%g0, [%0 + %%g2] %6\n\t"
 223                "sta    %%g0, [%0 + %%g3] %6\n\t"
 224                "sta    %%g0, [%0 + %%g4] %6\n\t"
 225                "sta    %%g0, [%0 + %%g5] %6\n\t"
 226                "sta    %%g0, [%0 + %%o4] %6\n\t"
 227                "bg     1b\n\t"
 228                " add   %0, %%o5, %0\n"
 229                : "=&r" (addr), "=&r" (left), "=&r" (lsize)
 230                : "0" (addr), "1" (left), "2" (lsize),
 231                  "i" (ASI_FLUSHPG)
 232                : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc");
 233        }
 234}
 235
 236/* The sun4c's do have an on chip store buffer.  And the way you
 237 * clear them out isn't so obvious.  The only way I can think of
 238 * to accomplish this is to read the current context register,
 239 * store the same value there, then read an external hardware
 240 * register.
 241 */
 242void sun4c_complete_all_stores(void)
 243{
 244        volatile int _unused;
 245
 246        _unused = sun4c_get_context();
 247        sun4c_set_context(_unused);
 248#ifdef CONFIG_SUN_AUXIO
 249        _unused = get_auxio();
 250#endif
 251}
 252
 253/* Bootup utility functions. */
 254static inline void sun4c_init_clean_segmap(unsigned char pseg)
 255{
 256        unsigned long vaddr;
 257
 258        sun4c_put_segmap(0, pseg);
 259        for (vaddr = 0; vaddr < SUN4C_REAL_PGDIR_SIZE; vaddr += PAGE_SIZE)
 260                sun4c_put_pte(vaddr, 0);
 261        sun4c_put_segmap(0, invalid_segment);
 262}
 263
 264static inline void sun4c_init_clean_mmu(unsigned long kernel_end)
 265{
 266        unsigned long vaddr;
 267        unsigned char savectx, ctx;
 268
 269        savectx = sun4c_get_context();
 270        for (ctx = 0; ctx < num_contexts; ctx++) {
 271                sun4c_set_context(ctx);
 272                for (vaddr = 0; vaddr < 0x20000000; vaddr += SUN4C_REAL_PGDIR_SIZE)
 273                        sun4c_put_segmap(vaddr, invalid_segment);
 274                for (vaddr = 0xe0000000; vaddr < KERNBASE; vaddr += SUN4C_REAL_PGDIR_SIZE)
 275                        sun4c_put_segmap(vaddr, invalid_segment);
 276                for (vaddr = kernel_end; vaddr < KADB_DEBUGGER_BEGVM; vaddr += SUN4C_REAL_PGDIR_SIZE)
 277                        sun4c_put_segmap(vaddr, invalid_segment);
 278                for (vaddr = LINUX_OPPROM_ENDVM; vaddr; vaddr += SUN4C_REAL_PGDIR_SIZE)
 279                        sun4c_put_segmap(vaddr, invalid_segment);
 280        }
 281        sun4c_set_context(savectx);
 282}
 283
 284void __init sun4c_probe_vac(void)
 285{
 286        sun4c_disable_vac();
 287
 288        if (ARCH_SUN4) {
 289                switch (idprom->id_machtype) {
 290
 291                case (SM_SUN4|SM_4_110):
 292                        sun4c_vacinfo.type = VAC_NONE;
 293                        sun4c_vacinfo.num_bytes = 0;
 294                        sun4c_vacinfo.linesize = 0;
 295                        sun4c_vacinfo.do_hwflushes = 0;
 296                        prom_printf("No VAC. Get some bucks and buy a real computer.");
 297                        prom_halt();
 298                        break;
 299
 300                case (SM_SUN4|SM_4_260):
 301                        sun4c_vacinfo.type = VAC_WRITE_BACK;
 302                        sun4c_vacinfo.num_bytes = 128 * 1024;
 303                        sun4c_vacinfo.linesize = 16;
 304                        sun4c_vacinfo.do_hwflushes = 0;
 305                        break;
 306
 307                case (SM_SUN4|SM_4_330):
 308                        sun4c_vacinfo.type = VAC_WRITE_THROUGH;
 309                        sun4c_vacinfo.num_bytes = 128 * 1024;
 310                        sun4c_vacinfo.linesize = 16;
 311                        sun4c_vacinfo.do_hwflushes = 0;
 312                        break;
 313
 314                case (SM_SUN4|SM_4_470):
 315                        sun4c_vacinfo.type = VAC_WRITE_BACK;
 316                        sun4c_vacinfo.num_bytes = 128 * 1024;
 317                        sun4c_vacinfo.linesize = 32;
 318                        sun4c_vacinfo.do_hwflushes = 0;
 319                        break;
 320
 321                default:
 322                        prom_printf("Cannot initialize VAC - weird sun4 model idprom->id_machtype = %d", idprom->id_machtype);
 323                        prom_halt();
 324                };
 325        } else {
 326                sun4c_vacinfo.type = VAC_WRITE_THROUGH;
 327
 328                if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) ||
 329                    (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) {
 330                        /* PROM on SS1 lacks this info, to be super safe we
 331                         * hard code it here since this arch is cast in stone.
 332                         */
 333                        sun4c_vacinfo.num_bytes = 65536;
 334                        sun4c_vacinfo.linesize = 16;
 335                } else {
 336                        sun4c_vacinfo.num_bytes =
 337                         prom_getintdefault(prom_root_node, "vac-size", 65536);
 338                        sun4c_vacinfo.linesize =
 339                         prom_getintdefault(prom_root_node, "vac-linesize", 16);
 340                }
 341                sun4c_vacinfo.do_hwflushes =
 342                 prom_getintdefault(prom_root_node, "vac-hwflush", 0);
 343
 344                if (sun4c_vacinfo.do_hwflushes == 0)
 345                        sun4c_vacinfo.do_hwflushes =
 346                         prom_getintdefault(prom_root_node, "vac_hwflush", 0);
 347
 348                if (sun4c_vacinfo.num_bytes != 65536) {
 349                        prom_printf("WEIRD Sun4C VAC cache size, "
 350                                    "tell sparclinux@vger.kernel.org");
 351                        prom_halt();
 352                }
 353        }
 354
 355        sun4c_vacinfo.num_lines =
 356                (sun4c_vacinfo.num_bytes / sun4c_vacinfo.linesize);
 357        switch (sun4c_vacinfo.linesize) {
 358        case 16:
 359                sun4c_vacinfo.log2lsize = 4;
 360                break;
 361        case 32:
 362                sun4c_vacinfo.log2lsize = 5;
 363                break;
 364        default:
 365                prom_printf("probe_vac: Didn't expect vac-linesize of %d, halting\n",
 366                            sun4c_vacinfo.linesize);
 367                prom_halt();
 368        };
 369
 370        sun4c_flush_all();
 371        sun4c_enable_vac();
 372}
 373
 374/* Patch instructions for the low level kernel fault handler. */
 375extern unsigned long invalid_segment_patch1, invalid_segment_patch1_ff;
 376extern unsigned long invalid_segment_patch2, invalid_segment_patch2_ff;
 377extern unsigned long invalid_segment_patch1_1ff, invalid_segment_patch2_1ff;
 378extern unsigned long num_context_patch1, num_context_patch1_16;
 379extern unsigned long num_context_patch2_16;
 380extern unsigned long vac_linesize_patch, vac_linesize_patch_32;
 381extern unsigned long vac_hwflush_patch1, vac_hwflush_patch1_on;
 382extern unsigned long vac_hwflush_patch2, vac_hwflush_patch2_on;
 383
 384#define PATCH_INSN(src, dst) do {       \
 385                daddr = &(dst);         \
 386                iaddr = &(src);         \
 387                *daddr = *iaddr;        \
 388        } while (0)
 389
 390static void __init patch_kernel_fault_handler(void)
 391{
 392        unsigned long *iaddr, *daddr;
 393
 394        switch (num_segmaps) {
 395                case 128:
 396                        /* Default, nothing to do. */
 397                        break;
 398                case 256:
 399                        PATCH_INSN(invalid_segment_patch1_ff,
 400                                   invalid_segment_patch1);
 401                        PATCH_INSN(invalid_segment_patch2_ff,
 402                                   invalid_segment_patch2);
 403                        break;
 404                case 512:
 405                        PATCH_INSN(invalid_segment_patch1_1ff,
 406                                   invalid_segment_patch1);
 407                        PATCH_INSN(invalid_segment_patch2_1ff,
 408                                   invalid_segment_patch2);
 409                        break;
 410                default:
 411                        prom_printf("Unhandled number of segmaps: %d\n",
 412                                    num_segmaps);
 413                        prom_halt();
 414        };
 415        switch (num_contexts) {
 416                case 8:
 417                        /* Default, nothing to do. */
 418                        break;
 419                case 16:
 420                        PATCH_INSN(num_context_patch1_16,
 421                                   num_context_patch1);
 422                        break;
 423                default:
 424                        prom_printf("Unhandled number of contexts: %d\n",
 425                                    num_contexts);
 426                        prom_halt();
 427        };
 428
 429        if (sun4c_vacinfo.do_hwflushes != 0) {
 430                PATCH_INSN(vac_hwflush_patch1_on, vac_hwflush_patch1);
 431                PATCH_INSN(vac_hwflush_patch2_on, vac_hwflush_patch2);
 432        } else {
 433                switch (sun4c_vacinfo.linesize) {
 434                case 16:
 435                        /* Default, nothing to do. */
 436                        break;
 437                case 32:
 438                        PATCH_INSN(vac_linesize_patch_32, vac_linesize_patch);
 439                        break;
 440                default:
 441                        prom_printf("Impossible VAC linesize %d, halting...\n",
 442                                    sun4c_vacinfo.linesize);
 443                        prom_halt();
 444                };
 445        }
 446}
 447
 448static void __init sun4c_probe_mmu(void)
 449{
 450        if (ARCH_SUN4) {
 451                switch (idprom->id_machtype) {
 452                case (SM_SUN4|SM_4_110):
 453                        prom_printf("No support for 4100 yet\n");
 454                        prom_halt();
 455                        num_segmaps = 256;
 456                        num_contexts = 8;
 457                        break;
 458
 459                case (SM_SUN4|SM_4_260):
 460                        /* should be 512 segmaps. when it get fixed */
 461                        num_segmaps = 256;
 462                        num_contexts = 16;
 463                        break;
 464
 465                case (SM_SUN4|SM_4_330):
 466                        num_segmaps = 256;
 467                        num_contexts = 16;
 468                        break;
 469
 470                case (SM_SUN4|SM_4_470):
 471                        /* should be 1024 segmaps. when it get fixed */
 472                        num_segmaps = 256;
 473                        num_contexts = 64;
 474                        break;
 475                default:
 476                        prom_printf("Invalid SUN4 model\n");
 477                        prom_halt();
 478                };
 479        } else {
 480                if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) ||
 481                    (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) {
 482                        /* Hardcode these just to be safe, PROM on SS1 does
 483                        * not have this info available in the root node.
 484                        */
 485                        num_segmaps = 128;
 486                        num_contexts = 8;
 487                } else {
 488                        num_segmaps =
 489                            prom_getintdefault(prom_root_node, "mmu-npmg", 128);
 490                        num_contexts =
 491                            prom_getintdefault(prom_root_node, "mmu-nctx", 0x8);
 492                }
 493        }
 494        patch_kernel_fault_handler();
 495}
 496
 497volatile unsigned long __iomem *sun4c_memerr_reg = NULL;
 498
 499void __init sun4c_probe_memerr_reg(void)
 500{
 501        int node;
 502        struct linux_prom_registers regs[1];
 503
 504        if (ARCH_SUN4) {
 505                sun4c_memerr_reg = ioremap(sun4_memreg_physaddr, PAGE_SIZE);
 506        } else {
 507                node = prom_getchild(prom_root_node);
 508                node = prom_searchsiblings(prom_root_node, "memory-error");
 509                if (!node)
 510                        return;
 511                if (prom_getproperty(node, "reg", (char *)regs, sizeof(regs)) <= 0)
 512                        return;
 513                /* hmm I think regs[0].which_io is zero here anyways */
 514                sun4c_memerr_reg = ioremap(regs[0].phys_addr, regs[0].reg_size);
 515        }
 516}
 517
 518static inline void sun4c_init_ss2_cache_bug(void)
 519{
 520        extern unsigned long start;
 521
 522        if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS2)) ||
 523            (idprom->id_machtype == (SM_SUN4C | SM_4C_IPX)) ||
 524            (idprom->id_machtype == (SM_SUN4 | SM_4_330)) ||
 525            (idprom->id_machtype == (SM_SUN4C | SM_4C_ELC))) {
 526                /* Whee.. */
 527                printk("SS2 cache bug detected, uncaching trap table page\n");
 528                sun4c_flush_page((unsigned int) &start);
 529                sun4c_put_pte(((unsigned long) &start),
 530                        (sun4c_get_pte((unsigned long) &start) | _SUN4C_PAGE_NOCACHE));
 531        }
 532}
 533
 534/* Addr is always aligned on a page boundary for us already. */
 535static int sun4c_map_dma_area(dma_addr_t *pba, unsigned long va,
 536    unsigned long addr, int len)
 537{
 538        unsigned long page, end;
 539
 540        *pba = addr;
 541
 542        end = PAGE_ALIGN((addr + len));
 543        while (addr < end) {
 544                page = va;
 545                sun4c_flush_page(page);
 546                page -= PAGE_OFFSET;
 547                page >>= PAGE_SHIFT;
 548                page |= (_SUN4C_PAGE_VALID | _SUN4C_PAGE_DIRTY |
 549                         _SUN4C_PAGE_NOCACHE | _SUN4C_PAGE_PRIV);
 550                sun4c_put_pte(addr, page);
 551                addr += PAGE_SIZE;
 552                va += PAGE_SIZE;
 553        }
 554
 555        return 0;
 556}
 557
 558static struct page *sun4c_translate_dvma(unsigned long busa)
 559{
 560        /* Fortunately for us, bus_addr == uncached_virt in sun4c. */
 561        unsigned long pte = sun4c_get_pte(busa);
 562        return pfn_to_page(pte & SUN4C_PFN_MASK);
 563}
 564
 565static void sun4c_unmap_dma_area(unsigned long busa, int len)
 566{
 567        /* Fortunately for us, bus_addr == uncached_virt in sun4c. */
 568        /* XXX Implement this */
 569}
 570
 571/* TLB management. */
 572
 573/* Don't change this struct without changing entry.S. This is used
 574 * in the in-window kernel fault handler, and you don't want to mess
 575 * with that. (See sun4c_fault in entry.S).
 576 */
 577struct sun4c_mmu_entry {
 578        struct sun4c_mmu_entry *next;
 579        struct sun4c_mmu_entry *prev;
 580        unsigned long vaddr;
 581        unsigned char pseg;
 582        unsigned char locked;
 583
 584        /* For user mappings only, and completely hidden from kernel
 585         * TLB miss code.
 586         */
 587        unsigned char ctx;
 588        struct sun4c_mmu_entry *lru_next;
 589        struct sun4c_mmu_entry *lru_prev;
 590};
 591
 592static struct sun4c_mmu_entry mmu_entry_pool[SUN4C_MAX_SEGMAPS];
 593
 594static void __init sun4c_init_mmu_entry_pool(void)
 595{
 596        int i;
 597
 598        for (i=0; i < SUN4C_MAX_SEGMAPS; i++) {
 599                mmu_entry_pool[i].pseg = i;
 600                mmu_entry_pool[i].next = NULL;
 601                mmu_entry_pool[i].prev = NULL;
 602                mmu_entry_pool[i].vaddr = 0;
 603                mmu_entry_pool[i].locked = 0;
 604                mmu_entry_pool[i].ctx = 0;
 605                mmu_entry_pool[i].lru_next = NULL;
 606                mmu_entry_pool[i].lru_prev = NULL;
 607        }
 608        mmu_entry_pool[invalid_segment].locked = 1;
 609}
 610
 611static inline void fix_permissions(unsigned long vaddr, unsigned long bits_on,
 612                                   unsigned long bits_off)
 613{
 614        unsigned long start, end;
 615
 616        end = vaddr + SUN4C_REAL_PGDIR_SIZE;
 617        for (start = vaddr; start < end; start += PAGE_SIZE)
 618                if (sun4c_get_pte(start) & _SUN4C_PAGE_VALID)
 619                        sun4c_put_pte(start, (sun4c_get_pte(start) | bits_on) &
 620                                      ~bits_off);
 621}
 622
 623static inline void sun4c_init_map_kernelprom(unsigned long kernel_end)
 624{
 625        unsigned long vaddr;
 626        unsigned char pseg, ctx;
 627#ifdef CONFIG_SUN4
 628        /* sun4/110 and 260 have no kadb. */
 629        if ((idprom->id_machtype != (SM_SUN4 | SM_4_260)) && 
 630            (idprom->id_machtype != (SM_SUN4 | SM_4_110))) {
 631#endif
 632        for (vaddr = KADB_DEBUGGER_BEGVM;
 633             vaddr < LINUX_OPPROM_ENDVM;
 634             vaddr += SUN4C_REAL_PGDIR_SIZE) {
 635                pseg = sun4c_get_segmap(vaddr);
 636                if (pseg != invalid_segment) {
 637                        mmu_entry_pool[pseg].locked = 1;
 638                        for (ctx = 0; ctx < num_contexts; ctx++)
 639                                prom_putsegment(ctx, vaddr, pseg);
 640                        fix_permissions(vaddr, _SUN4C_PAGE_PRIV, 0);
 641                }
 642        }
 643#ifdef CONFIG_SUN4
 644        }
 645#endif
 646        for (vaddr = KERNBASE; vaddr < kernel_end; vaddr += SUN4C_REAL_PGDIR_SIZE) {
 647                pseg = sun4c_get_segmap(vaddr);
 648                mmu_entry_pool[pseg].locked = 1;
 649                for (ctx = 0; ctx < num_contexts; ctx++)
 650                        prom_putsegment(ctx, vaddr, pseg);
 651                fix_permissions(vaddr, _SUN4C_PAGE_PRIV, _SUN4C_PAGE_NOCACHE);
 652        }
 653}
 654
 655static void __init sun4c_init_lock_area(unsigned long start, unsigned long end)
 656{
 657        int i, ctx;
 658
 659        while (start < end) {
 660                for (i = 0; i < invalid_segment; i++)
 661                        if (!mmu_entry_pool[i].locked)
 662                                break;
 663                mmu_entry_pool[i].locked = 1;
 664                sun4c_init_clean_segmap(i);
 665                for (ctx = 0; ctx < num_contexts; ctx++)
 666                        prom_putsegment(ctx, start, mmu_entry_pool[i].pseg);
 667                start += SUN4C_REAL_PGDIR_SIZE;
 668        }
 669}
 670
 671/* Don't change this struct without changing entry.S. This is used
 672 * in the in-window kernel fault handler, and you don't want to mess
 673 * with that. (See sun4c_fault in entry.S).
 674 */
 675struct sun4c_mmu_ring {
 676        struct sun4c_mmu_entry ringhd;
 677        int num_entries;
 678};
 679
 680static struct sun4c_mmu_ring sun4c_context_ring[SUN4C_MAX_CONTEXTS]; /* used user entries */
 681static struct sun4c_mmu_ring sun4c_ufree_ring;       /* free user entries */
 682static struct sun4c_mmu_ring sun4c_ulru_ring;        /* LRU user entries */
 683struct sun4c_mmu_ring sun4c_kernel_ring;      /* used kernel entries */
 684struct sun4c_mmu_ring sun4c_kfree_ring;       /* free kernel entries */
 685
 686static inline void sun4c_init_rings(void)
 687{
 688        int i;
 689
 690        for (i = 0; i < SUN4C_MAX_CONTEXTS; i++) {
 691                sun4c_context_ring[i].ringhd.next =
 692                        sun4c_context_ring[i].ringhd.prev =
 693                        &sun4c_context_ring[i].ringhd;
 694                sun4c_context_ring[i].num_entries = 0;
 695        }
 696        sun4c_ufree_ring.ringhd.next = sun4c_ufree_ring.ringhd.prev =
 697                &sun4c_ufree_ring.ringhd;
 698        sun4c_ufree_ring.num_entries = 0;
 699        sun4c_ulru_ring.ringhd.lru_next = sun4c_ulru_ring.ringhd.lru_prev =
 700                &sun4c_ulru_ring.ringhd;
 701        sun4c_ulru_ring.num_entries = 0;
 702        sun4c_kernel_ring.ringhd.next = sun4c_kernel_ring.ringhd.prev =
 703                &sun4c_kernel_ring.ringhd;
 704        sun4c_kernel_ring.num_entries = 0;
 705        sun4c_kfree_ring.ringhd.next = sun4c_kfree_ring.ringhd.prev =
 706                &sun4c_kfree_ring.ringhd;
 707        sun4c_kfree_ring.num_entries = 0;
 708}
 709
 710static void add_ring(struct sun4c_mmu_ring *ring,
 711                     struct sun4c_mmu_entry *entry)
 712{
 713        struct sun4c_mmu_entry *head = &ring->ringhd;
 714
 715        entry->prev = head;
 716        (entry->next = head->next)->prev = entry;
 717        head->next = entry;
 718        ring->num_entries++;
 719}
 720
 721static inline void add_lru(struct sun4c_mmu_entry *entry)
 722{
 723        struct sun4c_mmu_ring *ring = &sun4c_ulru_ring;
 724        struct sun4c_mmu_entry *head = &ring->ringhd;
 725
 726        entry->lru_next = head;
 727        (entry->lru_prev = head->lru_prev)->lru_next = entry;
 728        head->lru_prev = entry;
 729}
 730
 731static void add_ring_ordered(struct sun4c_mmu_ring *ring,
 732                             struct sun4c_mmu_entry *entry)
 733{
 734        struct sun4c_mmu_entry *head = &ring->ringhd;
 735        unsigned long addr = entry->vaddr;
 736
 737        while ((head->next != &ring->ringhd) && (head->next->vaddr < addr))
 738                head = head->next;
 739
 740        entry->prev = head;
 741        (entry->next = head->next)->prev = entry;
 742        head->next = entry;
 743        ring->num_entries++;
 744
 745        add_lru(entry);
 746}
 747
 748static inline void remove_ring(struct sun4c_mmu_ring *ring,
 749                                   struct sun4c_mmu_entry *entry)
 750{
 751        struct sun4c_mmu_entry *next = entry->next;
 752
 753        (next->prev = entry->prev)->next = next;
 754        ring->num_entries--;
 755}
 756
 757static void remove_lru(struct sun4c_mmu_entry *entry)
 758{
 759        struct sun4c_mmu_entry *next = entry->lru_next;
 760
 761        (next->lru_prev = entry->lru_prev)->lru_next = next;
 762}
 763
 764static void free_user_entry(int ctx, struct sun4c_mmu_entry *entry)
 765{
 766        remove_ring(sun4c_context_ring+ctx, entry);
 767        remove_lru(entry);
 768        add_ring(&sun4c_ufree_ring, entry);
 769}
 770
 771static void free_kernel_entry(struct sun4c_mmu_entry *entry,
 772                              struct sun4c_mmu_ring *ring)
 773{
 774        remove_ring(ring, entry);
 775        add_ring(&sun4c_kfree_ring, entry);
 776}
 777
 778static void __init sun4c_init_fill_kernel_ring(int howmany)
 779{
 780        int i;
 781
 782        while (howmany) {
 783                for (i = 0; i < invalid_segment; i++)
 784                        if (!mmu_entry_pool[i].locked)
 785                                break;
 786                mmu_entry_pool[i].locked = 1;
 787                sun4c_init_clean_segmap(i);
 788                add_ring(&sun4c_kfree_ring, &mmu_entry_pool[i]);
 789                howmany--;
 790        }
 791}
 792
 793static void __init sun4c_init_fill_user_ring(void)
 794{
 795        int i;
 796
 797        for (i = 0; i < invalid_segment; i++) {
 798                if (mmu_entry_pool[i].locked)
 799                        continue;
 800                sun4c_init_clean_segmap(i);
 801                add_ring(&sun4c_ufree_ring, &mmu_entry_pool[i]);
 802        }
 803}
 804
 805static void sun4c_kernel_unmap(struct sun4c_mmu_entry *kentry)
 806{
 807        int savectx, ctx;
 808
 809        savectx = sun4c_get_context();
 810        for (ctx = 0; ctx < num_contexts; ctx++) {
 811                sun4c_set_context(ctx);
 812                sun4c_put_segmap(kentry->vaddr, invalid_segment);
 813        }
 814        sun4c_set_context(savectx);
 815}
 816
 817static void sun4c_kernel_map(struct sun4c_mmu_entry *kentry)
 818{
 819        int savectx, ctx;
 820
 821        savectx = sun4c_get_context();
 822        for (ctx = 0; ctx < num_contexts; ctx++) {
 823                sun4c_set_context(ctx);
 824                sun4c_put_segmap(kentry->vaddr, kentry->pseg);
 825        }
 826        sun4c_set_context(savectx);
 827}
 828
 829#define sun4c_user_unmap(__entry) \
 830        sun4c_put_segmap((__entry)->vaddr, invalid_segment)
 831
 832static void sun4c_demap_context(struct sun4c_mmu_ring *crp, unsigned char ctx)
 833{
 834        struct sun4c_mmu_entry *head = &crp->ringhd;
 835        unsigned long flags;
 836
 837        local_irq_save(flags);
 838        if (head->next != head) {
 839                struct sun4c_mmu_entry *entry = head->next;
 840                int savectx = sun4c_get_context();
 841
 842                flush_user_windows();
 843                sun4c_set_context(ctx);
 844                sun4c_flush_context();
 845                do {
 846                        struct sun4c_mmu_entry *next = entry->next;
 847
 848                        sun4c_user_unmap(entry);
 849                        free_user_entry(ctx, entry);
 850
 851                        entry = next;
 852                } while (entry != head);
 853                sun4c_set_context(savectx);
 854        }
 855        local_irq_restore(flags);
 856}
 857
 858static int sun4c_user_taken_entries;  /* This is how much we have.             */
 859static int max_user_taken_entries;    /* This limits us and prevents deadlock. */
 860
 861static struct sun4c_mmu_entry *sun4c_kernel_strategy(void)
 862{
 863        struct sun4c_mmu_entry *this_entry;
 864
 865        /* If some are free, return first one. */
 866        if (sun4c_kfree_ring.num_entries) {
 867                this_entry = sun4c_kfree_ring.ringhd.next;
 868                return this_entry;
 869        }
 870
 871        /* Else free one up. */
 872        this_entry = sun4c_kernel_ring.ringhd.prev;
 873        sun4c_flush_segment(this_entry->vaddr);
 874        sun4c_kernel_unmap(this_entry);
 875        free_kernel_entry(this_entry, &sun4c_kernel_ring);
 876        this_entry = sun4c_kfree_ring.ringhd.next;
 877
 878        return this_entry;
 879}
 880
 881/* Using this method to free up mmu entries eliminates a lot of
 882 * potential races since we have a kernel that incurs tlb
 883 * replacement faults.  There may be performance penalties.
 884 *
 885 * NOTE: Must be called with interrupts disabled.
 886 */
 887static struct sun4c_mmu_entry *sun4c_user_strategy(void)
 888{
 889        struct sun4c_mmu_entry *entry;
 890        unsigned char ctx;
 891        int savectx;
 892
 893        /* If some are free, return first one. */
 894        if (sun4c_ufree_ring.num_entries) {
 895                entry = sun4c_ufree_ring.ringhd.next;
 896                goto unlink_out;
 897        }
 898
 899        if (sun4c_user_taken_entries) {
 900                entry = sun4c_kernel_strategy();
 901                sun4c_user_taken_entries--;
 902                goto kunlink_out;
 903        }
 904
 905        /* Grab from the beginning of the LRU list. */
 906        entry = sun4c_ulru_ring.ringhd.lru_next;
 907        ctx = entry->ctx;
 908
 909        savectx = sun4c_get_context();
 910        flush_user_windows();
 911        sun4c_set_context(ctx);
 912        sun4c_flush_segment(entry->vaddr);
 913        sun4c_user_unmap(entry);
 914        remove_ring(sun4c_context_ring + ctx, entry);
 915        remove_lru(entry);
 916        sun4c_set_context(savectx);
 917
 918        return entry;
 919
 920unlink_out:
 921        remove_ring(&sun4c_ufree_ring, entry);
 922        return entry;
 923kunlink_out:
 924        remove_ring(&sun4c_kfree_ring, entry);
 925        return entry;
 926}
 927
 928/* NOTE: Must be called with interrupts disabled. */
 929void sun4c_grow_kernel_ring(void)
 930{
 931        struct sun4c_mmu_entry *entry;
 932
 933        /* Prevent deadlock condition. */
 934        if (sun4c_user_taken_entries >= max_user_taken_entries)
 935                return;
 936
 937        if (sun4c_ufree_ring.num_entries) {
 938                entry = sun4c_ufree_ring.ringhd.next;
 939                remove_ring(&sun4c_ufree_ring, entry);
 940                add_ring(&sun4c_kfree_ring, entry);
 941                sun4c_user_taken_entries++;
 942        }
 943}
 944
 945/* 2 page buckets for task struct and kernel stack allocation.
 946 *
 947 * TASK_STACK_BEGIN
 948 * bucket[0]
 949 * bucket[1]
 950 *   [ ... ]
 951 * bucket[NR_TASK_BUCKETS-1]
 952 * TASK_STACK_BEGIN + (sizeof(struct task_bucket) * NR_TASK_BUCKETS)
 953 *
 954 * Each slot looks like:
 955 *
 956 *  page 1 --  task struct + beginning of kernel stack
 957 *  page 2 --  rest of kernel stack
 958 */
 959
 960union task_union *sun4c_bucket[NR_TASK_BUCKETS];
 961
 962static int sun4c_lowbucket_avail;
 963
 964#define BUCKET_EMPTY     ((union task_union *) 0)
 965#define BUCKET_SHIFT     (PAGE_SHIFT + 1)        /* log2(sizeof(struct task_bucket)) */
 966#define BUCKET_SIZE      (1 << BUCKET_SHIFT)
 967#define BUCKET_NUM(addr) ((((addr) - SUN4C_LOCK_VADDR) >> BUCKET_SHIFT))
 968#define BUCKET_ADDR(num) (((num) << BUCKET_SHIFT) + SUN4C_LOCK_VADDR)
 969#define BUCKET_PTE(page)       \
 970        ((((page) - PAGE_OFFSET) >> PAGE_SHIFT) | pgprot_val(SUN4C_PAGE_KERNEL))
 971#define BUCKET_PTE_PAGE(pte)   \
 972        (PAGE_OFFSET + (((pte) & SUN4C_PFN_MASK) << PAGE_SHIFT))
 973
 974static void get_locked_segment(unsigned long addr)
 975{
 976        struct sun4c_mmu_entry *stolen;
 977        unsigned long flags;
 978
 979        local_irq_save(flags);
 980        addr &= SUN4C_REAL_PGDIR_MASK;
 981        stolen = sun4c_user_strategy();
 982        max_user_taken_entries--;
 983        stolen->vaddr = addr;
 984        flush_user_windows();
 985        sun4c_kernel_map(stolen);
 986        local_irq_restore(flags);
 987}
 988
 989static void free_locked_segment(unsigned long addr)
 990{
 991        struct sun4c_mmu_entry *entry;
 992        unsigned long flags;
 993        unsigned char pseg;
 994
 995        local_irq_save(flags);
 996        addr &= SUN4C_REAL_PGDIR_MASK;
 997        pseg = sun4c_get_segmap(addr);
 998        entry = &mmu_entry_pool[pseg];
 999
1000        flush_user_windows();
1001        sun4c_flush_segment(addr);
1002        sun4c_kernel_unmap(entry);
1003        add_ring(&sun4c_ufree_ring, entry);
1004        max_user_taken_entries++;
1005        local_irq_restore(flags);
1006}
1007
1008static inline void garbage_collect(int entry)
1009{
1010        int start, end;
1011
1012        /* 32 buckets per segment... */
1013        entry &= ~31;
1014        start = entry;
1015        for (end = (start + 32); start < end; start++)
1016                if (sun4c_bucket[start] != BUCKET_EMPTY)
1017                        return;
1018
1019        /* Entire segment empty, release it. */
1020        free_locked_segment(BUCKET_ADDR(entry));
1021}
1022
1023static struct thread_info *sun4c_alloc_thread_info(void)
1024{
1025        unsigned long addr, pages;
1026        int entry;
1027
1028        pages = __get_free_pages(GFP_KERNEL, THREAD_INFO_ORDER);
1029        if (!pages)
1030                return NULL;
1031
1032        for (entry = sun4c_lowbucket_avail; entry < NR_TASK_BUCKETS; entry++)
1033                if (sun4c_bucket[entry] == BUCKET_EMPTY)
1034                        break;
1035        if (entry == NR_TASK_BUCKETS) {
1036                free_pages(pages, THREAD_INFO_ORDER);
1037                return NULL;
1038        }
1039        if (entry >= sun4c_lowbucket_avail)
1040                sun4c_lowbucket_avail = entry + 1;
1041
1042        addr = BUCKET_ADDR(entry);
1043        sun4c_bucket[entry] = (union task_union *) addr;
1044        if(sun4c_get_segmap(addr) == invalid_segment)
1045                get_locked_segment(addr);
1046
1047        /* We are changing the virtual color of the page(s)
1048         * so we must flush the cache to guarantee consistency.
1049         */
1050        sun4c_flush_page(pages);
1051#ifndef CONFIG_SUN4     
1052        sun4c_flush_page(pages + PAGE_SIZE);
1053#endif
1054
1055        sun4c_put_pte(addr, BUCKET_PTE(pages));
1056#ifndef CONFIG_SUN4     
1057        sun4c_put_pte(addr + PAGE_SIZE, BUCKET_PTE(pages + PAGE_SIZE));
1058#endif
1059
1060#ifdef CONFIG_DEBUG_STACK_USAGE
1061        memset((void *)addr, 0, PAGE_SIZE << THREAD_INFO_ORDER);
1062#endif /* DEBUG_STACK_USAGE */
1063
1064        return (struct thread_info *) addr;
1065}
1066
1067static void sun4c_free_thread_info(struct thread_info *ti)
1068{
1069        unsigned long tiaddr = (unsigned long) ti;
1070        unsigned long pages = BUCKET_PTE_PAGE(sun4c_get_pte(tiaddr));
1071        int entry = BUCKET_NUM(tiaddr);
1072
1073        /* We are deleting a mapping, so the flush here is mandatory. */
1074        sun4c_flush_page(tiaddr);
1075#ifndef CONFIG_SUN4     
1076        sun4c_flush_page(tiaddr + PAGE_SIZE);
1077#endif
1078        sun4c_put_pte(tiaddr, 0);
1079#ifndef CONFIG_SUN4     
1080        sun4c_put_pte(tiaddr + PAGE_SIZE, 0);
1081#endif
1082        sun4c_bucket[entry] = BUCKET_EMPTY;
1083        if (entry < sun4c_lowbucket_avail)
1084                sun4c_lowbucket_avail = entry;
1085
1086        free_pages(pages, THREAD_INFO_ORDER);
1087        garbage_collect(entry);
1088}
1089
1090static void __init sun4c_init_buckets(void)
1091{
1092        int entry;
1093
1094        if (sizeof(union thread_union) != (PAGE_SIZE << THREAD_INFO_ORDER)) {
1095                extern void thread_info_size_is_bolixed_pete(void);
1096                thread_info_size_is_bolixed_pete();
1097        }
1098
1099        for (entry = 0; entry < NR_TASK_BUCKETS; entry++)
1100                sun4c_bucket[entry] = BUCKET_EMPTY;
1101        sun4c_lowbucket_avail = 0;
1102}
1103
1104static unsigned long sun4c_iobuffer_start;
1105static unsigned long sun4c_iobuffer_end;
1106static unsigned long sun4c_iobuffer_high;
1107static unsigned long *sun4c_iobuffer_map;
1108static int iobuffer_map_size;
1109
1110/*
1111 * Alias our pages so they do not cause a trap.
1112 * Also one page may be aliased into several I/O areas and we may
1113 * finish these I/O separately.
1114 */
1115static char *sun4c_lockarea(char *vaddr, unsigned long size)
1116{
1117        unsigned long base, scan;
1118        unsigned long npages;
1119        unsigned long vpage;
1120        unsigned long pte;
1121        unsigned long apage;
1122        unsigned long high;
1123        unsigned long flags;
1124
1125        npages = (((unsigned long)vaddr & ~PAGE_MASK) +
1126                  size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
1127
1128        scan = 0;
1129        local_irq_save(flags);
1130        for (;;) {
1131                scan = find_next_zero_bit(sun4c_iobuffer_map,
1132                                          iobuffer_map_size, scan);
1133                if ((base = scan) + npages > iobuffer_map_size) goto abend;
1134                for (;;) {
1135                        if (scan >= base + npages) goto found;
1136                        if (test_bit(scan, sun4c_iobuffer_map)) break;
1137                        scan++;
1138                }
1139        }
1140
1141found:
1142        high = ((base + npages) << PAGE_SHIFT) + sun4c_iobuffer_start;
1143        high = SUN4C_REAL_PGDIR_ALIGN(high);
1144        while (high > sun4c_iobuffer_high) {
1145                get_locked_segment(sun4c_iobuffer_high);
1146                sun4c_iobuffer_high += SUN4C_REAL_PGDIR_SIZE;
1147        }
1148
1149        vpage = ((unsigned long) vaddr) & PAGE_MASK;
1150        for (scan = base; scan < base+npages; scan++) {
1151                pte = ((vpage-PAGE_OFFSET) >> PAGE_SHIFT);
1152                pte |= pgprot_val(SUN4C_PAGE_KERNEL);
1153                pte |= _SUN4C_PAGE_NOCACHE;
1154                set_bit(scan, sun4c_iobuffer_map);
1155                apage = (scan << PAGE_SHIFT) + sun4c_iobuffer_start;
1156
1157                /* Flush original mapping so we see the right things later. */
1158                sun4c_flush_page(vpage);
1159
1160                sun4c_put_pte(apage, pte);
1161                vpage += PAGE_SIZE;
1162        }
1163        local_irq_restore(flags);
1164        return (char *) ((base << PAGE_SHIFT) + sun4c_iobuffer_start +
1165                         (((unsigned long) vaddr) & ~PAGE_MASK));
1166
1167abend:
1168        local_irq_restore(flags);
1169        printk("DMA vaddr=0x%p size=%08lx\n", vaddr, size);
1170        panic("Out of iobuffer table");
1171        return NULL;
1172}
1173
1174static void sun4c_unlockarea(char *vaddr, unsigned long size)
1175{
1176        unsigned long vpage, npages;
1177        unsigned long flags;
1178        int scan, high;
1179
1180        vpage = (unsigned long)vaddr & PAGE_MASK;
1181        npages = (((unsigned long)vaddr & ~PAGE_MASK) +
1182                  size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
1183
1184        local_irq_save(flags);
1185        while (npages != 0) {
1186                --npages;
1187
1188                /* This mapping is marked non-cachable, no flush necessary. */
1189                sun4c_put_pte(vpage, 0);
1190                clear_bit((vpage - sun4c_iobuffer_start) >> PAGE_SHIFT,
1191                          sun4c_iobuffer_map);
1192                vpage += PAGE_SIZE;
1193        }
1194
1195        /* garbage collect */
1196        scan = (sun4c_iobuffer_high - sun4c_iobuffer_start) >> PAGE_SHIFT;
1197        while (scan >= 0 && !sun4c_iobuffer_map[scan >> 5])
1198                scan -= 32;
1199        scan += 32;
1200        high = sun4c_iobuffer_start + (scan << PAGE_SHIFT);
1201        high = SUN4C_REAL_PGDIR_ALIGN(high) + SUN4C_REAL_PGDIR_SIZE;
1202        while (high < sun4c_iobuffer_high) {
1203                sun4c_iobuffer_high -= SUN4C_REAL_PGDIR_SIZE;
1204                free_locked_segment(sun4c_iobuffer_high);
1205        }
1206        local_irq_restore(flags);
1207}
1208
1209/* Note the scsi code at init time passes to here buffers
1210 * which sit on the kernel stack, those are already locked
1211 * by implication and fool the page locking code above
1212 * if passed to by mistake.
1213 */
1214static __u32 sun4c_get_scsi_one(char *bufptr, unsigned long len, struct sbus_bus *sbus)
1215{
1216        unsigned long page;
1217
1218        page = ((unsigned long)bufptr) & PAGE_MASK;
1219        if (!virt_addr_valid(page)) {
1220                sun4c_flush_page(page);
1221                return (__u32)bufptr; /* already locked */
1222        }
1223        return (__u32)sun4c_lockarea(bufptr, len);
1224}
1225
1226static void sun4c_get_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus)
1227{
1228        while (sz != 0) {
1229                --sz;
1230                sg->dvma_address = (__u32)sun4c_lockarea(sg_virt(sg), sg->length);
1231                sg->dvma_length = sg->length;
1232                sg = sg_next(sg);
1233        }
1234}
1235
1236static void sun4c_release_scsi_one(__u32 bufptr, unsigned long len, struct sbus_bus *sbus)
1237{
1238        if (bufptr < sun4c_iobuffer_start)
1239                return; /* On kernel stack or similar, see above */
1240        sun4c_unlockarea((char *)bufptr, len);
1241}
1242
1243static void sun4c_release_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus)
1244{
1245        while (sz != 0) {
1246                --sz;
1247                sun4c_unlockarea((char *)sg->dvma_address, sg->length);
1248                sg = sg_next(sg);
1249        }
1250}
1251
1252#define TASK_ENTRY_SIZE    BUCKET_SIZE /* see above */
1253#define LONG_ALIGN(x) (((x)+(sizeof(long))-1)&~((sizeof(long))-1))
1254
1255struct vm_area_struct sun4c_kstack_vma;
1256
1257static void __init sun4c_init_lock_areas(void)
1258{
1259        unsigned long sun4c_taskstack_start;
1260        unsigned long sun4c_taskstack_end;
1261        int bitmap_size;
1262
1263        sun4c_init_buckets();
1264        sun4c_taskstack_start = SUN4C_LOCK_VADDR;
1265        sun4c_taskstack_end = (sun4c_taskstack_start +
1266                               (TASK_ENTRY_SIZE * NR_TASK_BUCKETS));
1267        if (sun4c_taskstack_end >= SUN4C_LOCK_END) {
1268                prom_printf("Too many tasks, decrease NR_TASK_BUCKETS please.\n");
1269                prom_halt();
1270        }
1271
1272        sun4c_iobuffer_start = sun4c_iobuffer_high =
1273                                SUN4C_REAL_PGDIR_ALIGN(sun4c_taskstack_end);
1274        sun4c_iobuffer_end = SUN4C_LOCK_END;
1275        bitmap_size = (sun4c_iobuffer_end - sun4c_iobuffer_start) >> PAGE_SHIFT;
1276        bitmap_size = (bitmap_size + 7) >> 3;
1277        bitmap_size = LONG_ALIGN(bitmap_size);
1278        iobuffer_map_size = bitmap_size << 3;
1279        sun4c_iobuffer_map = __alloc_bootmem(bitmap_size, SMP_CACHE_BYTES, 0UL);
1280        memset((void *) sun4c_iobuffer_map, 0, bitmap_size);
1281
1282        sun4c_kstack_vma.vm_mm = &init_mm;
1283        sun4c_kstack_vma.vm_start = sun4c_taskstack_start;
1284        sun4c_kstack_vma.vm_end = sun4c_taskstack_end;
1285        sun4c_kstack_vma.vm_page_prot = PAGE_SHARED;
1286        sun4c_kstack_vma.vm_flags = VM_READ | VM_WRITE | VM_EXEC;
1287        insert_vm_struct(&init_mm, &sun4c_kstack_vma);
1288}
1289
1290/* Cache flushing on the sun4c. */
1291static void sun4c_flush_cache_all(void)
1292{
1293        unsigned long begin, end;
1294
1295        flush_user_windows();
1296        begin = (KERNBASE + SUN4C_REAL_PGDIR_SIZE);
1297        end = (begin + SUN4C_VAC_SIZE);
1298
1299        if (sun4c_vacinfo.linesize == 32) {
1300                while (begin < end) {
1301                        __asm__ __volatile__(
1302                        "ld     [%0 + 0x00], %%g0\n\t"
1303                        "ld     [%0 + 0x20], %%g0\n\t"
1304                        "ld     [%0 + 0x40], %%g0\n\t"
1305                        "ld     [%0 + 0x60], %%g0\n\t"
1306                        "ld     [%0 + 0x80], %%g0\n\t"
1307                        "ld     [%0 + 0xa0], %%g0\n\t"
1308                        "ld     [%0 + 0xc0], %%g0\n\t"
1309                        "ld     [%0 + 0xe0], %%g0\n\t"
1310                        "ld     [%0 + 0x100], %%g0\n\t"
1311                        "ld     [%0 + 0x120], %%g0\n\t"
1312                        "ld     [%0 + 0x140], %%g0\n\t"
1313                        "ld     [%0 + 0x160], %%g0\n\t"
1314                        "ld     [%0 + 0x180], %%g0\n\t"
1315                        "ld     [%0 + 0x1a0], %%g0\n\t"
1316                        "ld     [%0 + 0x1c0], %%g0\n\t"
1317                        "ld     [%0 + 0x1e0], %%g0\n"
1318                        : : "r" (begin));
1319                        begin += 512;
1320                }
1321        } else {
1322                while (begin < end) {
1323                        __asm__ __volatile__(
1324                        "ld     [%0 + 0x00], %%g0\n\t"
1325                        "ld     [%0 + 0x10], %%g0\n\t"
1326                        "ld     [%0 + 0x20], %%g0\n\t"
1327                        "ld     [%0 + 0x30], %%g0\n\t"
1328                        "ld     [%0 + 0x40], %%g0\n\t"
1329                        "ld     [%0 + 0x50], %%g0\n\t"
1330                        "ld     [%0 + 0x60], %%g0\n\t"
1331                        "ld     [%0 + 0x70], %%g0\n\t"
1332                        "ld     [%0 + 0x80], %%g0\n\t"
1333                        "ld     [%0 + 0x90], %%g0\n\t"
1334                        "ld     [%0 + 0xa0], %%g0\n\t"
1335                        "ld     [%0 + 0xb0], %%g0\n\t"
1336                        "ld     [%0 + 0xc0], %%g0\n\t"
1337                        "ld     [%0 + 0xd0], %%g0\n\t"
1338                        "ld     [%0 + 0xe0], %%g0\n\t"
1339                        "ld     [%0 + 0xf0], %%g0\n"
1340                        : : "r" (begin));
1341                        begin += 256;
1342                }
1343        }
1344}
1345
1346static void sun4c_flush_cache_mm(struct mm_struct *mm)
1347{
1348        int new_ctx = mm->context;
1349
1350        if (new_ctx != NO_CONTEXT) {
1351                flush_user_windows();
1352
1353                if (sun4c_context_ring[new_ctx].num_entries) {
1354                        struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
1355                        unsigned long flags;
1356
1357                        local_irq_save(flags);
1358                        if (head->next != head) {
1359                                struct sun4c_mmu_entry *entry = head->next;
1360                                int savectx = sun4c_get_context();
1361
1362                                sun4c_set_context(new_ctx);
1363                                sun4c_flush_context();
1364                                do {
1365                                        struct sun4c_mmu_entry *next = entry->next;
1366
1367                                        sun4c_user_unmap(entry);
1368                                        free_user_entry(new_ctx, entry);
1369
1370                                        entry = next;
1371                                } while (entry != head);
1372                                sun4c_set_context(savectx);
1373                        }
1374                        local_irq_restore(flags);
1375                }
1376        }
1377}
1378
1379static void sun4c_flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end)
1380{
1381        struct mm_struct *mm = vma->vm_mm;
1382        int new_ctx = mm->context;
1383
1384        if (new_ctx != NO_CONTEXT) {
1385                struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
1386                struct sun4c_mmu_entry *entry;
1387                unsigned long flags;
1388
1389                flush_user_windows();
1390
1391                local_irq_save(flags);
1392                /* All user segmap chains are ordered on entry->vaddr. */
1393                for (entry = head->next;
1394                     (entry != head) && ((entry->vaddr+SUN4C_REAL_PGDIR_SIZE) < start);
1395                     entry = entry->next)
1396                        ;
1397
1398                /* Tracing various job mixtures showed that this conditional
1399                 * only passes ~35% of the time for most worse case situations,
1400                 * therefore we avoid all of this gross overhead ~65% of the time.
1401                 */
1402                if ((entry != head) && (entry->vaddr < end)) {
1403                        int octx = sun4c_get_context();
1404                        sun4c_set_context(new_ctx);
1405
1406                        /* At this point, always, (start >= entry->vaddr) and
1407                         * (entry->vaddr < end), once the latter condition
1408                         * ceases to hold, or we hit the end of the list, we
1409                         * exit the loop.  The ordering of all user allocated
1410                         * segmaps makes this all work out so beautifully.
1411                         */
1412                        do {
1413                                struct sun4c_mmu_entry *next = entry->next;
1414                                unsigned long realend;
1415
1416                                /* "realstart" is always >= entry->vaddr */
1417                                realend = entry->vaddr + SUN4C_REAL_PGDIR_SIZE;
1418                                if (end < realend)
1419                                        realend = end;
1420                                if ((realend - entry->vaddr) <= (PAGE_SIZE << 3)) {
1421                                        unsigned long page = entry->vaddr;
1422                                        while (page < realend) {
1423                                                sun4c_flush_page(page);
1424                                                page += PAGE_SIZE;
1425                                        }
1426                                } else {
1427                                        sun4c_flush_segment(entry->vaddr);
1428                                        sun4c_user_unmap(entry);
1429                                        free_user_entry(new_ctx, entry);
1430                                }
1431                                entry = next;
1432                        } while ((entry != head) && (entry->vaddr < end));
1433                        sun4c_set_context(octx);
1434                }
1435                local_irq_restore(flags);
1436        }
1437}
1438
1439static void sun4c_flush_cache_page(struct vm_area_struct *vma, unsigned long page)
1440{
1441        struct mm_struct *mm = vma->vm_mm;
1442        int new_ctx = mm->context;
1443
1444        /* Sun4c has no separate I/D caches so cannot optimize for non
1445         * text page flushes.
1446         */
1447        if (new_ctx != NO_CONTEXT) {
1448                int octx = sun4c_get_context();
1449                unsigned long flags;
1450
1451                flush_user_windows();
1452                local_irq_save(flags);
1453                sun4c_set_context(new_ctx);
1454                sun4c_flush_page(page);
1455                sun4c_set_context(octx);
1456                local_irq_restore(flags);
1457        }
1458}
1459
1460static void sun4c_flush_page_to_ram(unsigned long page)
1461{
1462        unsigned long flags;
1463
1464        local_irq_save(flags);
1465        sun4c_flush_page(page);
1466        local_irq_restore(flags);
1467}
1468
1469/* Sun4c cache is unified, both instructions and data live there, so
1470 * no need to flush the on-stack instructions for new signal handlers.
1471 */
1472static void sun4c_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr)
1473{
1474}
1475
1476/* TLB flushing on the sun4c.  These routines count on the cache
1477 * flushing code to flush the user register windows so that we need
1478 * not do so when we get here.
1479 */
1480
1481static void sun4c_flush_tlb_all(void)
1482{
1483        struct sun4c_mmu_entry *this_entry, *next_entry;
1484        unsigned long flags;
1485        int savectx, ctx;
1486
1487        local_irq_save(flags);
1488        this_entry = sun4c_kernel_ring.ringhd.next;
1489        savectx = sun4c_get_context();
1490        flush_user_windows();
1491        while (sun4c_kernel_ring.num_entries) {
1492                next_entry = this_entry->next;
1493                sun4c_flush_segment(this_entry->vaddr);
1494                for (ctx = 0; ctx < num_contexts; ctx++) {
1495                        sun4c_set_context(ctx);
1496                        sun4c_put_segmap(this_entry->vaddr, invalid_segment);
1497                }
1498                free_kernel_entry(this_entry, &sun4c_kernel_ring);
1499                this_entry = next_entry;
1500        }
1501        sun4c_set_context(savectx);
1502        local_irq_restore(flags);
1503}
1504
1505static void sun4c_flush_tlb_mm(struct mm_struct *mm)
1506{
1507        int new_ctx = mm->context;
1508
1509        if (new_ctx != NO_CONTEXT) {
1510                struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
1511                unsigned long flags;
1512
1513                local_irq_save(flags);
1514                if (head->next != head) {
1515                        struct sun4c_mmu_entry *entry = head->next;
1516                        int savectx = sun4c_get_context();
1517
1518                        sun4c_set_context(new_ctx);
1519                        sun4c_flush_context();
1520                        do {
1521                                struct sun4c_mmu_entry *next = entry->next;
1522
1523                                sun4c_user_unmap(entry);
1524                                free_user_entry(new_ctx, entry);
1525
1526                                entry = next;
1527                        } while (entry != head);
1528                        sun4c_set_context(savectx);
1529                }
1530                local_irq_restore(flags);
1531        }
1532}
1533
1534static void sun4c_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end)
1535{
1536        struct mm_struct *mm = vma->vm_mm;
1537        int new_ctx = mm->context;
1538
1539        if (new_ctx != NO_CONTEXT) {
1540                struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
1541                struct sun4c_mmu_entry *entry;
1542                unsigned long flags;
1543
1544                local_irq_save(flags);
1545                /* See commentary in sun4c_flush_cache_range(). */
1546                for (entry = head->next;
1547                     (entry != head) && ((entry->vaddr+SUN4C_REAL_PGDIR_SIZE) < start);
1548                     entry = entry->next)
1549                        ;
1550
1551                if ((entry != head) && (entry->vaddr < end)) {
1552                        int octx = sun4c_get_context();
1553
1554                        sun4c_set_context(new_ctx);
1555                        do {
1556                                struct sun4c_mmu_entry *next = entry->next;
1557
1558                                sun4c_flush_segment(entry->vaddr);
1559                                sun4c_user_unmap(entry);
1560                                free_user_entry(new_ctx, entry);
1561
1562                                entry = next;
1563                        } while ((entry != head) && (entry->vaddr < end));
1564                        sun4c_set_context(octx);
1565                }
1566                local_irq_restore(flags);
1567        }
1568}
1569
1570static void sun4c_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
1571{
1572        struct mm_struct *mm = vma->vm_mm;
1573        int new_ctx = mm->context;
1574
1575        if (new_ctx != NO_CONTEXT) {
1576                int savectx = sun4c_get_context();
1577                unsigned long flags;
1578
1579                local_irq_save(flags);
1580                sun4c_set_context(new_ctx);
1581                page &= PAGE_MASK;
1582                sun4c_flush_page(page);
1583                sun4c_put_pte(page, 0);
1584                sun4c_set_context(savectx);
1585                local_irq_restore(flags);
1586        }
1587}
1588
1589static inline void sun4c_mapioaddr(unsigned long physaddr, unsigned long virt_addr)
1590{
1591        unsigned long page_entry, pg_iobits;
1592
1593        pg_iobits = _SUN4C_PAGE_PRESENT | _SUN4C_READABLE | _SUN4C_WRITEABLE |
1594                    _SUN4C_PAGE_IO | _SUN4C_PAGE_NOCACHE;
1595
1596        page_entry = ((physaddr >> PAGE_SHIFT) & SUN4C_PFN_MASK);
1597        page_entry |= ((pg_iobits | _SUN4C_PAGE_PRIV) & ~(_SUN4C_PAGE_PRESENT));
1598        sun4c_put_pte(virt_addr, page_entry);
1599}
1600
1601static void sun4c_mapiorange(unsigned int bus, unsigned long xpa,
1602    unsigned long xva, unsigned int len)
1603{
1604        while (len != 0) {
1605                len -= PAGE_SIZE;
1606                sun4c_mapioaddr(xpa, xva);
1607                xva += PAGE_SIZE;
1608                xpa += PAGE_SIZE;
1609        }
1610}
1611
1612static void sun4c_unmapiorange(unsigned long virt_addr, unsigned int len)
1613{
1614        while (len != 0) {
1615                len -= PAGE_SIZE;
1616                sun4c_put_pte(virt_addr, 0);
1617                virt_addr += PAGE_SIZE;
1618        }
1619}
1620
1621static void sun4c_alloc_context(struct mm_struct *old_mm, struct mm_struct *mm)
1622{
1623        struct ctx_list *ctxp;
1624
1625        ctxp = ctx_free.next;
1626        if (ctxp != &ctx_free) {
1627                remove_from_ctx_list(ctxp);
1628                add_to_used_ctxlist(ctxp);
1629                mm->context = ctxp->ctx_number;
1630                ctxp->ctx_mm = mm;
1631                return;
1632        }
1633        ctxp = ctx_used.next;
1634        if (ctxp->ctx_mm == old_mm)
1635                ctxp = ctxp->next;
1636        remove_from_ctx_list(ctxp);
1637        add_to_used_ctxlist(ctxp);
1638        ctxp->ctx_mm->context = NO_CONTEXT;
1639        ctxp->ctx_mm = mm;
1640        mm->context = ctxp->ctx_number;
1641        sun4c_demap_context(&sun4c_context_ring[ctxp->ctx_number],
1642                               ctxp->ctx_number);
1643}
1644
1645/* Switch the current MM context. */
1646static void sun4c_switch_mm(struct mm_struct *old_mm, struct mm_struct *mm, struct task_struct *tsk, int cpu)
1647{
1648        struct ctx_list *ctx;
1649        int dirty = 0;
1650
1651        if (mm->context == NO_CONTEXT) {
1652                dirty = 1;
1653                sun4c_alloc_context(old_mm, mm);
1654        } else {
1655                /* Update the LRU ring of contexts. */
1656                ctx = ctx_list_pool + mm->context;
1657                remove_from_ctx_list(ctx);
1658                add_to_used_ctxlist(ctx);
1659        }
1660        if (dirty || old_mm != mm)
1661                sun4c_set_context(mm->context);
1662}
1663
1664static void sun4c_destroy_context(struct mm_struct *mm)
1665{
1666        struct ctx_list *ctx_old;
1667
1668        if (mm->context != NO_CONTEXT) {
1669                sun4c_demap_context(&sun4c_context_ring[mm->context], mm->context);
1670                ctx_old = ctx_list_pool + mm->context;
1671                remove_from_ctx_list(ctx_old);
1672                add_to_free_ctxlist(ctx_old);
1673                mm->context = NO_CONTEXT;
1674        }
1675}
1676
1677static void sun4c_mmu_info(struct seq_file *m)
1678{
1679        int used_user_entries, i;
1680
1681        used_user_entries = 0;
1682        for (i = 0; i < num_contexts; i++)
1683                used_user_entries += sun4c_context_ring[i].num_entries;
1684
1685        seq_printf(m, 
1686                   "vacsize\t\t: %d bytes\n"
1687                   "vachwflush\t: %s\n"
1688                   "vaclinesize\t: %d bytes\n"
1689                   "mmuctxs\t\t: %d\n"
1690                   "mmupsegs\t: %d\n"
1691                   "kernelpsegs\t: %d\n"
1692                   "kfreepsegs\t: %d\n"
1693                   "usedpsegs\t: %d\n"
1694                   "ufreepsegs\t: %d\n"
1695                   "user_taken\t: %d\n"
1696                   "max_taken\t: %d\n",
1697                   sun4c_vacinfo.num_bytes,
1698                   (sun4c_vacinfo.do_hwflushes ? "yes" : "no"),
1699                   sun4c_vacinfo.linesize,
1700                   num_contexts,
1701                   (invalid_segment + 1),
1702                   sun4c_kernel_ring.num_entries,
1703                   sun4c_kfree_ring.num_entries,
1704                   used_user_entries,
1705                   sun4c_ufree_ring.num_entries,
1706                   sun4c_user_taken_entries,
1707                   max_user_taken_entries);
1708}
1709
1710/* Nothing below here should touch the mmu hardware nor the mmu_entry
1711 * data structures.
1712 */
1713
1714/* First the functions which the mid-level code uses to directly
1715 * manipulate the software page tables.  Some defines since we are
1716 * emulating the i386 page directory layout.
1717 */
1718#define PGD_PRESENT  0x001
1719#define PGD_RW       0x002
1720#define PGD_USER     0x004
1721#define PGD_ACCESSED 0x020
1722#define PGD_DIRTY    0x040
1723#define PGD_TABLE    (PGD_PRESENT | PGD_RW | PGD_USER | PGD_ACCESSED | PGD_DIRTY)
1724
1725static void sun4c_set_pte(pte_t *ptep, pte_t pte)
1726{
1727        *ptep = pte;
1728}
1729
1730static void sun4c_pgd_set(pgd_t * pgdp, pmd_t * pmdp)
1731{
1732}
1733
1734static void sun4c_pmd_set(pmd_t * pmdp, pte_t * ptep)
1735{
1736        pmdp->pmdv[0] = PGD_TABLE | (unsigned long) ptep;
1737}
1738
1739static void sun4c_pmd_populate(pmd_t * pmdp, struct page * ptep)
1740{
1741        if (page_address(ptep) == NULL) BUG();  /* No highmem on sun4c */
1742        pmdp->pmdv[0] = PGD_TABLE | (unsigned long) page_address(ptep);
1743}
1744
1745static int sun4c_pte_present(pte_t pte)
1746{
1747        return ((pte_val(pte) & (_SUN4C_PAGE_PRESENT | _SUN4C_PAGE_PRIV)) != 0);
1748}
1749static void sun4c_pte_clear(pte_t *ptep)        { *ptep = __pte(0); }
1750
1751static int sun4c_pmd_bad(pmd_t pmd)
1752{
1753        return (((pmd_val(pmd) & ~PAGE_MASK) != PGD_TABLE) ||
1754                (!virt_addr_valid(pmd_val(pmd))));
1755}
1756
1757static int sun4c_pmd_present(pmd_t pmd)
1758{
1759        return ((pmd_val(pmd) & PGD_PRESENT) != 0);
1760}
1761
1762#if 0 /* if PMD takes one word */
1763static void sun4c_pmd_clear(pmd_t *pmdp)        { *pmdp = __pmd(0); }
1764#else /* if pmd_t is a longish aggregate */
1765static void sun4c_pmd_clear(pmd_t *pmdp) {
1766        memset((void *)pmdp, 0, sizeof(pmd_t));
1767}
1768#endif
1769
1770static int sun4c_pgd_none(pgd_t pgd)            { return 0; }
1771static int sun4c_pgd_bad(pgd_t pgd)             { return 0; }
1772static int sun4c_pgd_present(pgd_t pgd)         { return 1; }
1773static void sun4c_pgd_clear(pgd_t * pgdp)       { }
1774
1775/*
1776 * The following only work if pte_present() is true.
1777 * Undefined behaviour if not..
1778 */
1779static pte_t sun4c_pte_mkwrite(pte_t pte)
1780{
1781        pte = __pte(pte_val(pte) | _SUN4C_PAGE_WRITE);
1782        if (pte_val(pte) & _SUN4C_PAGE_MODIFIED)
1783                pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_WRITE);
1784        return pte;
1785}
1786
1787static pte_t sun4c_pte_mkdirty(pte_t pte)
1788{
1789        pte = __pte(pte_val(pte) | _SUN4C_PAGE_MODIFIED);
1790        if (pte_val(pte) & _SUN4C_PAGE_WRITE)
1791                pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_WRITE);
1792        return pte;
1793}
1794
1795static pte_t sun4c_pte_mkyoung(pte_t pte)
1796{
1797        pte = __pte(pte_val(pte) | _SUN4C_PAGE_ACCESSED);
1798        if (pte_val(pte) & _SUN4C_PAGE_READ)
1799                pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_READ);
1800        return pte;
1801}
1802
1803/*
1804 * Conversion functions: convert a page and protection to a page entry,
1805 * and a page entry and page directory to the page they refer to.
1806 */
1807static pte_t sun4c_mk_pte(struct page *page, pgprot_t pgprot)
1808{
1809        return __pte(page_to_pfn(page) | pgprot_val(pgprot));
1810}
1811
1812static pte_t sun4c_mk_pte_phys(unsigned long phys_page, pgprot_t pgprot)
1813{
1814        return __pte((phys_page >> PAGE_SHIFT) | pgprot_val(pgprot));
1815}
1816
1817static pte_t sun4c_mk_pte_io(unsigned long page, pgprot_t pgprot, int space)
1818{
1819        return __pte(((page - PAGE_OFFSET) >> PAGE_SHIFT) | pgprot_val(pgprot));
1820}
1821
1822static unsigned long sun4c_pte_pfn(pte_t pte)
1823{
1824        return pte_val(pte) & SUN4C_PFN_MASK;
1825}
1826
1827static pte_t sun4c_pgoff_to_pte(unsigned long pgoff)
1828{
1829        return __pte(pgoff | _SUN4C_PAGE_FILE);
1830}
1831
1832static unsigned long sun4c_pte_to_pgoff(pte_t pte)
1833{
1834        return pte_val(pte) & ((1UL << PTE_FILE_MAX_BITS) - 1);
1835}
1836
1837
1838static inline unsigned long sun4c_pmd_page_v(pmd_t pmd)
1839{
1840        return (pmd_val(pmd) & PAGE_MASK);
1841}
1842
1843static struct page *sun4c_pmd_page(pmd_t pmd)
1844{
1845        return virt_to_page(sun4c_pmd_page_v(pmd));
1846}
1847
1848static unsigned long sun4c_pgd_page(pgd_t pgd) { return 0; }
1849
1850/* to find an entry in a page-table-directory */
1851static inline pgd_t *sun4c_pgd_offset(struct mm_struct * mm, unsigned long address)
1852{
1853        return mm->pgd + (address >> SUN4C_PGDIR_SHIFT);
1854}
1855
1856/* Find an entry in the second-level page table.. */
1857static pmd_t *sun4c_pmd_offset(pgd_t * dir, unsigned long address)
1858{
1859        return (pmd_t *) dir;
1860}
1861
1862/* Find an entry in the third-level page table.. */ 
1863pte_t *sun4c_pte_offset_kernel(pmd_t * dir, unsigned long address)
1864{
1865        return (pte_t *) sun4c_pmd_page_v(*dir) +
1866                        ((address >> PAGE_SHIFT) & (SUN4C_PTRS_PER_PTE - 1));
1867}
1868
1869static unsigned long sun4c_swp_type(swp_entry_t entry)
1870{
1871        return (entry.val & SUN4C_SWP_TYPE_MASK);
1872}
1873
1874static unsigned long sun4c_swp_offset(swp_entry_t entry)
1875{
1876        return (entry.val >> SUN4C_SWP_OFF_SHIFT) & SUN4C_SWP_OFF_MASK;
1877}
1878
1879static swp_entry_t sun4c_swp_entry(unsigned long type, unsigned long offset)
1880{
1881        return (swp_entry_t) {
1882                  (offset & SUN4C_SWP_OFF_MASK) << SUN4C_SWP_OFF_SHIFT
1883                | (type & SUN4C_SWP_TYPE_MASK) };
1884}
1885
1886static void sun4c_free_pte_slow(pte_t *pte)
1887{
1888        free_page((unsigned long)pte);
1889}
1890
1891static void sun4c_free_pgd_slow(pgd_t *pgd)
1892{
1893        free_page((unsigned long)pgd);
1894}
1895
1896static pgd_t *sun4c_get_pgd_fast(void)
1897{
1898        unsigned long *ret;
1899
1900        if ((ret = pgd_quicklist) != NULL) {
1901                pgd_quicklist = (unsigned long *)(*ret);
1902                ret[0] = ret[1];
1903                pgtable_cache_size--;
1904        } else {
1905                pgd_t *init;
1906                
1907                ret = (unsigned long *)__get_free_page(GFP_KERNEL);
1908                memset (ret, 0, (KERNBASE / SUN4C_PGDIR_SIZE) * sizeof(pgd_t));
1909                init = sun4c_pgd_offset(&init_mm, 0);
1910                memcpy (((pgd_t *)ret) + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
1911                        (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
1912        }
1913        return (pgd_t *)ret;
1914}
1915
1916static void sun4c_free_pgd_fast(pgd_t *pgd)
1917{
1918        *(unsigned long *)pgd = (unsigned long) pgd_quicklist;
1919        pgd_quicklist = (unsigned long *) pgd;
1920        pgtable_cache_size++;
1921}
1922
1923
1924static inline pte_t *
1925sun4c_pte_alloc_one_fast(struct mm_struct *mm, unsigned long address)
1926{
1927        unsigned long *ret;
1928
1929        if ((ret = (unsigned long *)pte_quicklist) != NULL) {
1930                pte_quicklist = (unsigned long *)(*ret);
1931                ret[0] = ret[1];
1932                pgtable_cache_size--;
1933        }
1934        return (pte_t *)ret;
1935}
1936
1937static pte_t *sun4c_pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
1938{
1939        pte_t *pte;
1940
1941        if ((pte = sun4c_pte_alloc_one_fast(mm, address)) != NULL)
1942                return pte;
1943
1944        pte = (pte_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
1945        return pte;
1946}
1947
1948static pgtable_t sun4c_pte_alloc_one(struct mm_struct *mm, unsigned long address)
1949{
1950        pte_t *pte;
1951        struct page *page;
1952
1953        pte = sun4c_pte_alloc_one_kernel(mm, address);
1954        if (pte == NULL)
1955                return NULL;
1956        page = virt_to_page(pte);
1957        pgtable_page_ctor(page);
1958        return page;
1959}
1960
1961static inline void sun4c_free_pte_fast(pte_t *pte)
1962{
1963        *(unsigned long *)pte = (unsigned long) pte_quicklist;
1964        pte_quicklist = (unsigned long *) pte;
1965        pgtable_cache_size++;
1966}
1967
1968static void sun4c_pte_free(pgtable_t pte)
1969{
1970        pgtable_page_dtor(pte);
1971        sun4c_free_pte_fast(page_address(pte));
1972}
1973
1974/*
1975 * allocating and freeing a pmd is trivial: the 1-entry pmd is
1976 * inside the pgd, so has no extra memory associated with it.
1977 */
1978static pmd_t *sun4c_pmd_alloc_one(struct mm_struct *mm, unsigned long address)
1979{
1980        BUG();
1981        return NULL;
1982}
1983
1984static void sun4c_free_pmd_fast(pmd_t * pmd) { }
1985
1986static void sun4c_check_pgt_cache(int low, int high)
1987{
1988        if (pgtable_cache_size > high) {
1989                do {
1990                        if (pgd_quicklist)
1991                                sun4c_free_pgd_slow(sun4c_get_pgd_fast());
1992                        if (pte_quicklist)
1993                                sun4c_free_pte_slow(sun4c_pte_alloc_one_fast(NULL, 0));
1994                } while (pgtable_cache_size > low);
1995        }
1996}
1997
1998/* An experiment, turn off by default for now... -DaveM */
1999#define SUN4C_PRELOAD_PSEG
2000
2001void sun4c_update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t pte)
2002{
2003        unsigned long flags;
2004        int pseg;
2005
2006        if (vma->vm_mm->context == NO_CONTEXT)
2007                return;
2008
2009        local_irq_save(flags);
2010        address &= PAGE_MASK;
2011        if ((pseg = sun4c_get_segmap(address)) == invalid_segment) {
2012                struct sun4c_mmu_entry *entry = sun4c_user_strategy();
2013                struct mm_struct *mm = vma->vm_mm;
2014                unsigned long start, end;
2015
2016                entry->vaddr = start = (address & SUN4C_REAL_PGDIR_MASK);
2017                entry->ctx = mm->context;
2018                add_ring_ordered(sun4c_context_ring + mm->context, entry);
2019                sun4c_put_segmap(entry->vaddr, entry->pseg);
2020                end = start + SUN4C_REAL_PGDIR_SIZE;
2021                while (start < end) {
2022#ifdef SUN4C_PRELOAD_PSEG
2023                        pgd_t *pgdp = sun4c_pgd_offset(mm, start);
2024                        pte_t *ptep;
2025
2026                        if (!pgdp)
2027                                goto no_mapping;
2028                        ptep = sun4c_pte_offset_kernel((pmd_t *) pgdp, start);
2029                        if (!ptep || !(pte_val(*ptep) & _SUN4C_PAGE_PRESENT))
2030                                goto no_mapping;
2031                        sun4c_put_pte(start, pte_val(*ptep));
2032                        goto next;
2033
2034                no_mapping:
2035#endif
2036                        sun4c_put_pte(start, 0);
2037#ifdef SUN4C_PRELOAD_PSEG
2038                next:
2039#endif
2040                        start += PAGE_SIZE;
2041                }
2042#ifndef SUN4C_PRELOAD_PSEG
2043                sun4c_put_pte(address, pte_val(pte));
2044#endif
2045                local_irq_restore(flags);
2046                return;
2047        } else {
2048                struct sun4c_mmu_entry *entry = &mmu_entry_pool[pseg];
2049
2050                remove_lru(entry);
2051                add_lru(entry);
2052        }
2053
2054        sun4c_put_pte(address, pte_val(pte));
2055        local_irq_restore(flags);
2056}
2057
2058extern void sparc_context_init(int);
2059extern unsigned long end;
2060extern unsigned long bootmem_init(unsigned long *pages_avail);
2061extern unsigned long last_valid_pfn;
2062
2063void __init sun4c_paging_init(void)
2064{
2065        int i, cnt;
2066        unsigned long kernel_end, vaddr;
2067        extern struct resource sparc_iomap;
2068        unsigned long end_pfn, pages_avail;
2069
2070        kernel_end = (unsigned long) &end;
2071        kernel_end = SUN4C_REAL_PGDIR_ALIGN(kernel_end);
2072
2073        pages_avail = 0;
2074        last_valid_pfn = bootmem_init(&pages_avail);
2075        end_pfn = last_valid_pfn;
2076
2077        sun4c_probe_mmu();
2078        invalid_segment = (num_segmaps - 1);
2079        sun4c_init_mmu_entry_pool();
2080        sun4c_init_rings();
2081        sun4c_init_map_kernelprom(kernel_end);
2082        sun4c_init_clean_mmu(kernel_end);
2083        sun4c_init_fill_kernel_ring(SUN4C_KERNEL_BUCKETS);
2084        sun4c_init_lock_area(sparc_iomap.start, IOBASE_END);
2085        sun4c_init_lock_area(DVMA_VADDR, DVMA_END);
2086        sun4c_init_lock_areas();
2087        sun4c_init_fill_user_ring();
2088
2089        sun4c_set_context(0);
2090        memset(swapper_pg_dir, 0, PAGE_SIZE);
2091        memset(pg0, 0, PAGE_SIZE);
2092        memset(pg1, 0, PAGE_SIZE);
2093        memset(pg2, 0, PAGE_SIZE);
2094        memset(pg3, 0, PAGE_SIZE);
2095
2096        /* Save work later. */
2097        vaddr = VMALLOC_START;
2098        swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg0);
2099        vaddr += SUN4C_PGDIR_SIZE;
2100        swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg1);
2101        vaddr += SUN4C_PGDIR_SIZE;
2102        swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg2);
2103        vaddr += SUN4C_PGDIR_SIZE;
2104        swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg3);
2105        sun4c_init_ss2_cache_bug();
2106        sparc_context_init(num_contexts);
2107
2108        {
2109                unsigned long zones_size[MAX_NR_ZONES];
2110                unsigned long zholes_size[MAX_NR_ZONES];
2111                unsigned long npages;
2112                int znum;
2113
2114                for (znum = 0; znum < MAX_NR_ZONES; znum++)
2115                        zones_size[znum] = zholes_size[znum] = 0;
2116
2117                npages = max_low_pfn - pfn_base;
2118
2119                zones_size[ZONE_DMA] = npages;
2120                zholes_size[ZONE_DMA] = npages - pages_avail;
2121
2122                npages = highend_pfn - max_low_pfn;
2123                zones_size[ZONE_HIGHMEM] = npages;
2124                zholes_size[ZONE_HIGHMEM] = npages - calc_highpages();
2125
2126                free_area_init_node(0, zones_size, pfn_base, zholes_size);
2127        }
2128
2129        cnt = 0;
2130        for (i = 0; i < num_segmaps; i++)
2131                if (mmu_entry_pool[i].locked)
2132                        cnt++;
2133
2134        max_user_taken_entries = num_segmaps - cnt - 40 - 1;
2135
2136        printk("SUN4C: %d mmu entries for the kernel\n", cnt);
2137}
2138
2139static pgprot_t sun4c_pgprot_noncached(pgprot_t prot)
2140{
2141        prot |= __pgprot(_SUN4C_PAGE_IO | _SUN4C_PAGE_NOCACHE);
2142
2143        return prot;
2144}
2145
2146/* Load up routines and constants for sun4c mmu */
2147void __init ld_mmu_sun4c(void)
2148{
2149        extern void ___xchg32_sun4c(void);
2150        
2151        printk("Loading sun4c MMU routines\n");
2152
2153        /* First the constants */
2154        BTFIXUPSET_SIMM13(pgdir_shift, SUN4C_PGDIR_SHIFT);
2155        BTFIXUPSET_SETHI(pgdir_size, SUN4C_PGDIR_SIZE);
2156        BTFIXUPSET_SETHI(pgdir_mask, SUN4C_PGDIR_MASK);
2157
2158        BTFIXUPSET_SIMM13(ptrs_per_pmd, SUN4C_PTRS_PER_PMD);
2159        BTFIXUPSET_SIMM13(ptrs_per_pgd, SUN4C_PTRS_PER_PGD);
2160        BTFIXUPSET_SIMM13(user_ptrs_per_pgd, KERNBASE / SUN4C_PGDIR_SIZE);
2161
2162        BTFIXUPSET_INT(page_none, pgprot_val(SUN4C_PAGE_NONE));
2163        PAGE_SHARED = pgprot_val(SUN4C_PAGE_SHARED);
2164        BTFIXUPSET_INT(page_copy, pgprot_val(SUN4C_PAGE_COPY));
2165        BTFIXUPSET_INT(page_readonly, pgprot_val(SUN4C_PAGE_READONLY));
2166        BTFIXUPSET_INT(page_kernel, pgprot_val(SUN4C_PAGE_KERNEL));
2167        page_kernel = pgprot_val(SUN4C_PAGE_KERNEL);
2168
2169        /* Functions */
2170        BTFIXUPSET_CALL(pgprot_noncached, sun4c_pgprot_noncached, BTFIXUPCALL_NORM);
2171        BTFIXUPSET_CALL(___xchg32, ___xchg32_sun4c, BTFIXUPCALL_NORM);
2172        BTFIXUPSET_CALL(do_check_pgt_cache, sun4c_check_pgt_cache, BTFIXUPCALL_NORM);
2173        
2174        BTFIXUPSET_CALL(flush_cache_all, sun4c_flush_cache_all, BTFIXUPCALL_NORM);
2175
2176        if (sun4c_vacinfo.do_hwflushes) {
2177                BTFIXUPSET_CALL(sun4c_flush_page, sun4c_flush_page_hw, BTFIXUPCALL_NORM);
2178                BTFIXUPSET_CALL(sun4c_flush_segment, sun4c_flush_segment_hw, BTFIXUPCALL_NORM);
2179                BTFIXUPSET_CALL(sun4c_flush_context, sun4c_flush_context_hw, BTFIXUPCALL_NORM);
2180        } else {
2181                BTFIXUPSET_CALL(sun4c_flush_page, sun4c_flush_page_sw, BTFIXUPCALL_NORM);
2182                BTFIXUPSET_CALL(sun4c_flush_segment, sun4c_flush_segment_sw, BTFIXUPCALL_NORM);
2183                BTFIXUPSET_CALL(sun4c_flush_context, sun4c_flush_context_sw, BTFIXUPCALL_NORM);
2184        }
2185
2186        BTFIXUPSET_CALL(flush_tlb_mm, sun4c_flush_tlb_mm, BTFIXUPCALL_NORM);
2187        BTFIXUPSET_CALL(flush_cache_mm, sun4c_flush_cache_mm, BTFIXUPCALL_NORM);
2188        BTFIXUPSET_CALL(destroy_context, sun4c_destroy_context, BTFIXUPCALL_NORM);
2189        BTFIXUPSET_CALL(switch_mm, sun4c_switch_mm, BTFIXUPCALL_NORM);
2190        BTFIXUPSET_CALL(flush_cache_page, sun4c_flush_cache_page, BTFIXUPCALL_NORM);
2191        BTFIXUPSET_CALL(flush_tlb_page, sun4c_flush_tlb_page, BTFIXUPCALL_NORM);
2192        BTFIXUPSET_CALL(flush_tlb_range, sun4c_flush_tlb_range, BTFIXUPCALL_NORM);
2193        BTFIXUPSET_CALL(flush_cache_range, sun4c_flush_cache_range, BTFIXUPCALL_NORM);
2194        BTFIXUPSET_CALL(__flush_page_to_ram, sun4c_flush_page_to_ram, BTFIXUPCALL_NORM);
2195        BTFIXUPSET_CALL(flush_tlb_all, sun4c_flush_tlb_all, BTFIXUPCALL_NORM);
2196
2197        BTFIXUPSET_CALL(flush_sig_insns, sun4c_flush_sig_insns, BTFIXUPCALL_NOP);
2198
2199        BTFIXUPSET_CALL(set_pte, sun4c_set_pte, BTFIXUPCALL_STO1O0);
2200
2201        /* The 2.4.18 code does not set this on sun4c, how does it work? XXX */
2202        /* BTFIXUPSET_SETHI(none_mask, 0x00000000); */  /* Defaults to zero? */
2203
2204        BTFIXUPSET_CALL(pte_pfn, sun4c_pte_pfn, BTFIXUPCALL_NORM);
2205#if 0 /* PAGE_SHIFT <= 12 */ /* Eek. Investigate. XXX */
2206        BTFIXUPSET_CALL(pmd_page, sun4c_pmd_page, BTFIXUPCALL_ANDNINT(PAGE_SIZE - 1));
2207#else
2208        BTFIXUPSET_CALL(pmd_page, sun4c_pmd_page, BTFIXUPCALL_NORM);
2209#endif
2210        BTFIXUPSET_CALL(pmd_set, sun4c_pmd_set, BTFIXUPCALL_NORM);
2211        BTFIXUPSET_CALL(pmd_populate, sun4c_pmd_populate, BTFIXUPCALL_NORM);
2212
2213        BTFIXUPSET_CALL(pte_present, sun4c_pte_present, BTFIXUPCALL_NORM);
2214        BTFIXUPSET_CALL(pte_clear, sun4c_pte_clear, BTFIXUPCALL_STG0O0);
2215
2216        BTFIXUPSET_CALL(pmd_bad, sun4c_pmd_bad, BTFIXUPCALL_NORM);
2217        BTFIXUPSET_CALL(pmd_present, sun4c_pmd_present, BTFIXUPCALL_NORM);
2218        BTFIXUPSET_CALL(pmd_clear, sun4c_pmd_clear, BTFIXUPCALL_STG0O0);
2219
2220        BTFIXUPSET_CALL(pgd_none, sun4c_pgd_none, BTFIXUPCALL_RETINT(0));
2221        BTFIXUPSET_CALL(pgd_bad, sun4c_pgd_bad, BTFIXUPCALL_RETINT(0));
2222        BTFIXUPSET_CALL(pgd_present, sun4c_pgd_present, BTFIXUPCALL_RETINT(1));
2223        BTFIXUPSET_CALL(pgd_clear, sun4c_pgd_clear, BTFIXUPCALL_NOP);
2224
2225        BTFIXUPSET_CALL(mk_pte, sun4c_mk_pte, BTFIXUPCALL_NORM);
2226        BTFIXUPSET_CALL(mk_pte_phys, sun4c_mk_pte_phys, BTFIXUPCALL_NORM);
2227        BTFIXUPSET_CALL(mk_pte_io, sun4c_mk_pte_io, BTFIXUPCALL_NORM);
2228
2229        BTFIXUPSET_INT(pte_modify_mask, _SUN4C_PAGE_CHG_MASK);
2230        BTFIXUPSET_CALL(pmd_offset, sun4c_pmd_offset, BTFIXUPCALL_NORM);
2231        BTFIXUPSET_CALL(pte_offset_kernel, sun4c_pte_offset_kernel, BTFIXUPCALL_NORM);
2232        BTFIXUPSET_CALL(free_pte_fast, sun4c_free_pte_fast, BTFIXUPCALL_NORM);
2233        BTFIXUPSET_CALL(pte_free, sun4c_pte_free, BTFIXUPCALL_NORM);
2234        BTFIXUPSET_CALL(pte_alloc_one_kernel, sun4c_pte_alloc_one_kernel, BTFIXUPCALL_NORM);
2235        BTFIXUPSET_CALL(pte_alloc_one, sun4c_pte_alloc_one, BTFIXUPCALL_NORM);
2236        BTFIXUPSET_CALL(free_pmd_fast, sun4c_free_pmd_fast, BTFIXUPCALL_NOP);
2237        BTFIXUPSET_CALL(pmd_alloc_one, sun4c_pmd_alloc_one, BTFIXUPCALL_RETO0);
2238        BTFIXUPSET_CALL(free_pgd_fast, sun4c_free_pgd_fast, BTFIXUPCALL_NORM);
2239        BTFIXUPSET_CALL(get_pgd_fast, sun4c_get_pgd_fast, BTFIXUPCALL_NORM);
2240
2241        BTFIXUPSET_HALF(pte_writei, _SUN4C_PAGE_WRITE);
2242        BTFIXUPSET_HALF(pte_dirtyi, _SUN4C_PAGE_MODIFIED);
2243        BTFIXUPSET_HALF(pte_youngi, _SUN4C_PAGE_ACCESSED);
2244        BTFIXUPSET_HALF(pte_filei, _SUN4C_PAGE_FILE);
2245        BTFIXUPSET_HALF(pte_wrprotecti, _SUN4C_PAGE_WRITE|_SUN4C_PAGE_SILENT_WRITE);
2246        BTFIXUPSET_HALF(pte_mkcleani, _SUN4C_PAGE_MODIFIED|_SUN4C_PAGE_SILENT_WRITE);
2247        BTFIXUPSET_HALF(pte_mkoldi, _SUN4C_PAGE_ACCESSED|_SUN4C_PAGE_SILENT_READ);
2248        BTFIXUPSET_CALL(pte_mkwrite, sun4c_pte_mkwrite, BTFIXUPCALL_NORM);
2249        BTFIXUPSET_CALL(pte_mkdirty, sun4c_pte_mkdirty, BTFIXUPCALL_NORM);
2250        BTFIXUPSET_CALL(pte_mkyoung, sun4c_pte_mkyoung, BTFIXUPCALL_NORM);
2251        BTFIXUPSET_CALL(update_mmu_cache, sun4c_update_mmu_cache, BTFIXUPCALL_NORM);
2252
2253        BTFIXUPSET_CALL(pte_to_pgoff, sun4c_pte_to_pgoff, BTFIXUPCALL_NORM);
2254        BTFIXUPSET_CALL(pgoff_to_pte, sun4c_pgoff_to_pte, BTFIXUPCALL_NORM);
2255
2256        BTFIXUPSET_CALL(mmu_lockarea, sun4c_lockarea, BTFIXUPCALL_NORM);
2257        BTFIXUPSET_CALL(mmu_unlockarea, sun4c_unlockarea, BTFIXUPCALL_NORM);
2258
2259        BTFIXUPSET_CALL(mmu_get_scsi_one, sun4c_get_scsi_one, BTFIXUPCALL_NORM);
2260        BTFIXUPSET_CALL(mmu_get_scsi_sgl, sun4c_get_scsi_sgl, BTFIXUPCALL_NORM);
2261        BTFIXUPSET_CALL(mmu_release_scsi_one, sun4c_release_scsi_one, BTFIXUPCALL_NORM);
2262        BTFIXUPSET_CALL(mmu_release_scsi_sgl, sun4c_release_scsi_sgl, BTFIXUPCALL_NORM);
2263
2264        BTFIXUPSET_CALL(mmu_map_dma_area, sun4c_map_dma_area, BTFIXUPCALL_NORM);
2265        BTFIXUPSET_CALL(mmu_unmap_dma_area, sun4c_unmap_dma_area, BTFIXUPCALL_NORM);
2266        BTFIXUPSET_CALL(mmu_translate_dvma, sun4c_translate_dvma, BTFIXUPCALL_NORM);
2267
2268        BTFIXUPSET_CALL(sparc_mapiorange, sun4c_mapiorange, BTFIXUPCALL_NORM);
2269        BTFIXUPSET_CALL(sparc_unmapiorange, sun4c_unmapiorange, BTFIXUPCALL_NORM);
2270
2271        BTFIXUPSET_CALL(__swp_type, sun4c_swp_type, BTFIXUPCALL_NORM);
2272        BTFIXUPSET_CALL(__swp_offset, sun4c_swp_offset, BTFIXUPCALL_NORM);
2273        BTFIXUPSET_CALL(__swp_entry, sun4c_swp_entry, BTFIXUPCALL_NORM);
2274
2275        BTFIXUPSET_CALL(alloc_thread_info, sun4c_alloc_thread_info, BTFIXUPCALL_NORM);
2276        BTFIXUPSET_CALL(free_thread_info, sun4c_free_thread_info, BTFIXUPCALL_NORM);
2277
2278        BTFIXUPSET_CALL(mmu_info, sun4c_mmu_info, BTFIXUPCALL_NORM);
2279
2280        /* These should _never_ get called with two level tables. */
2281        BTFIXUPSET_CALL(pgd_set, sun4c_pgd_set, BTFIXUPCALL_NOP);
2282        BTFIXUPSET_CALL(pgd_page_vaddr, sun4c_pgd_page, BTFIXUPCALL_RETO0);
2283}
2284