linux-bk/arch/sparc/mm/sun4c.c
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   1/* $Id: sun4c.c,v 1.212 2001/12/21 04:56:15 davem Exp $
   2 * sun4c.c: Doing in software what should be done in hardware.
   3 *
   4 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
   5 * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
   6 * Copyright (C) 1996 Andrew Tridgell (Andrew.Tridgell@anu.edu.au)
   7 * Copyright (C) 1997-2000 Anton Blanchard (anton@samba.org)
   8 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   9 */
  10
  11#define NR_TASK_BUCKETS 512
  12
  13#include <linux/config.h>
  14#include <linux/kernel.h>
  15#include <linux/mm.h>
  16#include <linux/init.h>
  17#include <linux/bootmem.h>
  18#include <linux/highmem.h>
  19#include <linux/fs.h>
  20#include <linux/seq_file.h>
  21
  22#include <asm/scatterlist.h>
  23#include <asm/page.h>
  24#include <asm/pgalloc.h>
  25#include <asm/pgtable.h>
  26#include <asm/vaddrs.h>
  27#include <asm/idprom.h>
  28#include <asm/machines.h>
  29#include <asm/memreg.h>
  30#include <asm/processor.h>
  31#include <asm/auxio.h>
  32#include <asm/io.h>
  33#include <asm/oplib.h>
  34#include <asm/openprom.h>
  35#include <asm/mmu_context.h>
  36#include <asm/sun4paddr.h>
  37#include <asm/highmem.h>
  38#include <asm/btfixup.h>
  39#include <asm/cacheflush.h>
  40#include <asm/tlbflush.h>
  41
  42/* Because of our dynamic kernel TLB miss strategy, and how
  43 * our DVMA mapping allocation works, you _MUST_:
  44 *
  45 * 1) Disable interrupts _and_ not touch any dynamic kernel
  46 *    memory while messing with kernel MMU state.  By
  47 *    dynamic memory I mean any object which is not in
  48 *    the kernel image itself or a thread_union (both of
  49 *    which are locked into the MMU).
  50 * 2) Disable interrupts while messing with user MMU state.
  51 */
  52
  53extern int num_segmaps, num_contexts;
  54
  55extern unsigned long page_kernel;
  56
  57#ifdef CONFIG_SUN4
  58#define SUN4C_VAC_SIZE sun4c_vacinfo.num_bytes
  59#else
  60/* That's it, we prom_halt() on sun4c if the cache size is something other than 65536.
  61 * So let's save some cycles and just use that everywhere except for that bootup
  62 * sanity check.
  63 */
  64#define SUN4C_VAC_SIZE 65536
  65#endif
  66
  67#define SUN4C_KERNEL_BUCKETS 32
  68
  69/* Flushing the cache. */
  70struct sun4c_vac_props sun4c_vacinfo;
  71unsigned long sun4c_kernel_faults;
  72
  73/* Invalidate every sun4c cache line tag. */
  74static void __init sun4c_flush_all(void)
  75{
  76        unsigned long begin, end;
  77
  78        if (sun4c_vacinfo.on)
  79                panic("SUN4C: AIEEE, trying to invalidate vac while it is on.");
  80
  81        /* Clear 'valid' bit in all cache line tags */
  82        begin = AC_CACHETAGS;
  83        end = (AC_CACHETAGS + SUN4C_VAC_SIZE);
  84        while (begin < end) {
  85                __asm__ __volatile__("sta %%g0, [%0] %1\n\t" : :
  86                                     "r" (begin), "i" (ASI_CONTROL));
  87                begin += sun4c_vacinfo.linesize;
  88        }
  89}
  90
  91static void sun4c_flush_context_hw(void)
  92{
  93        unsigned long end = SUN4C_VAC_SIZE;
  94
  95        __asm__ __volatile__(
  96                "1:     addcc   %0, -4096, %0\n\t"
  97                "       bne     1b\n\t"
  98                "        sta    %%g0, [%0] %2"
  99        : "=&r" (end)
 100        : "0" (end), "i" (ASI_HWFLUSHCONTEXT)
 101        : "cc");
 102}
 103
 104/* Must be called minimally with IRQs disabled. */
 105static void sun4c_flush_segment_hw(unsigned long addr)
 106{
 107        if (sun4c_get_segmap(addr) != invalid_segment) {
 108                unsigned long vac_size = SUN4C_VAC_SIZE;
 109
 110                __asm__ __volatile__(
 111                        "1:     addcc   %0, -4096, %0\n\t"
 112                        "       bne     1b\n\t"
 113                        "        sta    %%g0, [%2 + %0] %3"
 114                        : "=&r" (vac_size)
 115                        : "0" (vac_size), "r" (addr), "i" (ASI_HWFLUSHSEG)
 116                        : "cc");
 117        }
 118}
 119
 120/* File local boot time fixups. */
 121BTFIXUPDEF_CALL(void, sun4c_flush_page, unsigned long)
 122BTFIXUPDEF_CALL(void, sun4c_flush_segment, unsigned long)
 123BTFIXUPDEF_CALL(void, sun4c_flush_context, void)
 124
 125#define sun4c_flush_page(addr) BTFIXUP_CALL(sun4c_flush_page)(addr)
 126#define sun4c_flush_segment(addr) BTFIXUP_CALL(sun4c_flush_segment)(addr)
 127#define sun4c_flush_context() BTFIXUP_CALL(sun4c_flush_context)()
 128
 129/* Must be called minimally with interrupts disabled. */
 130static void sun4c_flush_page_hw(unsigned long addr)
 131{
 132        addr &= PAGE_MASK;
 133        if ((int)sun4c_get_pte(addr) < 0)
 134                __asm__ __volatile__("sta %%g0, [%0] %1"
 135                                     : : "r" (addr), "i" (ASI_HWFLUSHPAGE));
 136}
 137
 138/* Don't inline the software version as it eats too many cache lines if expanded. */
 139static void sun4c_flush_context_sw(void)
 140{
 141        unsigned long nbytes = SUN4C_VAC_SIZE;
 142        unsigned long lsize = sun4c_vacinfo.linesize;
 143
 144        __asm__ __volatile__(
 145        "add    %2, %2, %%g1\n\t"
 146        "add    %2, %%g1, %%g2\n\t"
 147        "add    %2, %%g2, %%g3\n\t"
 148        "add    %2, %%g3, %%g4\n\t"
 149        "add    %2, %%g4, %%g5\n\t"
 150        "add    %2, %%g5, %%o4\n\t"
 151        "add    %2, %%o4, %%o5\n"
 152        "1:\n\t"
 153        "subcc  %0, %%o5, %0\n\t"
 154        "sta    %%g0, [%0] %3\n\t"
 155        "sta    %%g0, [%0 + %2] %3\n\t"
 156        "sta    %%g0, [%0 + %%g1] %3\n\t"
 157        "sta    %%g0, [%0 + %%g2] %3\n\t"
 158        "sta    %%g0, [%0 + %%g3] %3\n\t"
 159        "sta    %%g0, [%0 + %%g4] %3\n\t"
 160        "sta    %%g0, [%0 + %%g5] %3\n\t"
 161        "bg     1b\n\t"
 162        " sta   %%g0, [%1 + %%o4] %3\n"
 163        : "=&r" (nbytes)
 164        : "0" (nbytes), "r" (lsize), "i" (ASI_FLUSHCTX)
 165        : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc");
 166}
 167
 168/* Don't inline the software version as it eats too many cache lines if expanded. */
 169static void sun4c_flush_segment_sw(unsigned long addr)
 170{
 171        if (sun4c_get_segmap(addr) != invalid_segment) {
 172                unsigned long nbytes = SUN4C_VAC_SIZE;
 173                unsigned long lsize = sun4c_vacinfo.linesize;
 174
 175                __asm__ __volatile__(
 176                "add    %2, %2, %%g1\n\t"
 177                "add    %2, %%g1, %%g2\n\t"
 178                "add    %2, %%g2, %%g3\n\t"
 179                "add    %2, %%g3, %%g4\n\t"
 180                "add    %2, %%g4, %%g5\n\t"
 181                "add    %2, %%g5, %%o4\n\t"
 182                "add    %2, %%o4, %%o5\n"
 183                "1:\n\t"
 184                "subcc  %1, %%o5, %1\n\t"
 185                "sta    %%g0, [%0] %6\n\t"
 186                "sta    %%g0, [%0 + %2] %6\n\t"
 187                "sta    %%g0, [%0 + %%g1] %6\n\t"
 188                "sta    %%g0, [%0 + %%g2] %6\n\t"
 189                "sta    %%g0, [%0 + %%g3] %6\n\t"
 190                "sta    %%g0, [%0 + %%g4] %6\n\t"
 191                "sta    %%g0, [%0 + %%g5] %6\n\t"
 192                "sta    %%g0, [%0 + %%o4] %6\n\t"
 193                "bg     1b\n\t"
 194                " add   %0, %%o5, %0\n"
 195                : "=&r" (addr), "=&r" (nbytes), "=&r" (lsize)
 196                : "0" (addr), "1" (nbytes), "2" (lsize),
 197                  "i" (ASI_FLUSHSEG)
 198                : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc");
 199        }
 200}
 201
 202/* Don't inline the software version as it eats too many cache lines if expanded. */
 203static void sun4c_flush_page_sw(unsigned long addr)
 204{
 205        addr &= PAGE_MASK;
 206        if ((sun4c_get_pte(addr) & (_SUN4C_PAGE_NOCACHE | _SUN4C_PAGE_VALID)) ==
 207            _SUN4C_PAGE_VALID) {
 208                unsigned long left = PAGE_SIZE;
 209                unsigned long lsize = sun4c_vacinfo.linesize;
 210
 211                __asm__ __volatile__(
 212                "add    %2, %2, %%g1\n\t"
 213                "add    %2, %%g1, %%g2\n\t"
 214                "add    %2, %%g2, %%g3\n\t"
 215                "add    %2, %%g3, %%g4\n\t"
 216                "add    %2, %%g4, %%g5\n\t"
 217                "add    %2, %%g5, %%o4\n\t"
 218                "add    %2, %%o4, %%o5\n"
 219                "1:\n\t"
 220                "subcc  %1, %%o5, %1\n\t"
 221                "sta    %%g0, [%0] %6\n\t"
 222                "sta    %%g0, [%0 + %2] %6\n\t"
 223                "sta    %%g0, [%0 + %%g1] %6\n\t"
 224                "sta    %%g0, [%0 + %%g2] %6\n\t"
 225                "sta    %%g0, [%0 + %%g3] %6\n\t"
 226                "sta    %%g0, [%0 + %%g4] %6\n\t"
 227                "sta    %%g0, [%0 + %%g5] %6\n\t"
 228                "sta    %%g0, [%0 + %%o4] %6\n\t"
 229                "bg     1b\n\t"
 230                " add   %0, %%o5, %0\n"
 231                : "=&r" (addr), "=&r" (left), "=&r" (lsize)
 232                : "0" (addr), "1" (left), "2" (lsize),
 233                  "i" (ASI_FLUSHPG)
 234                : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc");
 235        }
 236}
 237
 238/* The sun4c's do have an on chip store buffer.  And the way you
 239 * clear them out isn't so obvious.  The only way I can think of
 240 * to accomplish this is to read the current context register,
 241 * store the same value there, then read an external hardware
 242 * register.
 243 */
 244void sun4c_complete_all_stores(void)
 245{
 246        volatile int _unused;
 247
 248        _unused = sun4c_get_context();
 249        sun4c_set_context(_unused);
 250#ifdef CONFIG_SUN_AUXIO
 251        _unused = get_auxio();
 252#endif
 253}
 254
 255/* Bootup utility functions. */
 256static inline void sun4c_init_clean_segmap(unsigned char pseg)
 257{
 258        unsigned long vaddr;
 259
 260        sun4c_put_segmap(0, pseg);
 261        for (vaddr = 0; vaddr < SUN4C_REAL_PGDIR_SIZE; vaddr += PAGE_SIZE)
 262                sun4c_put_pte(vaddr, 0);
 263        sun4c_put_segmap(0, invalid_segment);
 264}
 265
 266static inline void sun4c_init_clean_mmu(unsigned long kernel_end)
 267{
 268        unsigned long vaddr;
 269        unsigned char savectx, ctx;
 270
 271        savectx = sun4c_get_context();
 272        kernel_end = SUN4C_REAL_PGDIR_ALIGN(kernel_end);
 273        for (ctx = 0; ctx < num_contexts; ctx++) {
 274                sun4c_set_context(ctx);
 275                for (vaddr = 0; vaddr < 0x20000000; vaddr += SUN4C_REAL_PGDIR_SIZE)
 276                        sun4c_put_segmap(vaddr, invalid_segment);
 277                for (vaddr = 0xe0000000; vaddr < KERNBASE; vaddr += SUN4C_REAL_PGDIR_SIZE)
 278                        sun4c_put_segmap(vaddr, invalid_segment);
 279                for (vaddr = kernel_end; vaddr < KADB_DEBUGGER_BEGVM; vaddr += SUN4C_REAL_PGDIR_SIZE)
 280                        sun4c_put_segmap(vaddr, invalid_segment);
 281                for (vaddr = LINUX_OPPROM_ENDVM; vaddr; vaddr += SUN4C_REAL_PGDIR_SIZE)
 282                        sun4c_put_segmap(vaddr, invalid_segment);
 283        }
 284        sun4c_set_context(savectx);
 285}
 286
 287void __init sun4c_probe_vac(void)
 288{
 289        sun4c_disable_vac();
 290
 291        if (ARCH_SUN4) {
 292                switch (idprom->id_machtype) {
 293
 294                case (SM_SUN4|SM_4_110):
 295                        sun4c_vacinfo.type = VAC_NONE;
 296                        sun4c_vacinfo.num_bytes = 0;
 297                        sun4c_vacinfo.linesize = 0;
 298                        sun4c_vacinfo.do_hwflushes = 0;
 299                        prom_printf("No VAC. Get some bucks and buy a real computer.");
 300                        prom_halt();
 301                        break;
 302
 303                case (SM_SUN4|SM_4_260):
 304                        sun4c_vacinfo.type = VAC_WRITE_BACK;
 305                        sun4c_vacinfo.num_bytes = 128 * 1024;
 306                        sun4c_vacinfo.linesize = 16;
 307                        sun4c_vacinfo.do_hwflushes = 0;
 308                        break;
 309
 310                case (SM_SUN4|SM_4_330):
 311                        sun4c_vacinfo.type = VAC_WRITE_THROUGH;
 312                        sun4c_vacinfo.num_bytes = 128 * 1024;
 313                        sun4c_vacinfo.linesize = 16;
 314                        sun4c_vacinfo.do_hwflushes = 0;
 315                        break;
 316
 317                case (SM_SUN4|SM_4_470):
 318                        sun4c_vacinfo.type = VAC_WRITE_BACK;
 319                        sun4c_vacinfo.num_bytes = 128 * 1024;
 320                        sun4c_vacinfo.linesize = 32;
 321                        sun4c_vacinfo.do_hwflushes = 0;
 322                        break;
 323
 324                default:
 325                        prom_printf("Cannot initialize VAC - weird sun4 model idprom->id_machtype = %d", idprom->id_machtype);
 326                        prom_halt();
 327                };
 328        } else {
 329                sun4c_vacinfo.type = VAC_WRITE_THROUGH;
 330
 331                if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) ||
 332                    (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) {
 333                        /* PROM on SS1 lacks this info, to be super safe we
 334                         * hard code it here since this arch is cast in stone.
 335                         */
 336                        sun4c_vacinfo.num_bytes = 65536;
 337                        sun4c_vacinfo.linesize = 16;
 338                } else {
 339                        sun4c_vacinfo.num_bytes =
 340                         prom_getintdefault(prom_root_node, "vac-size", 65536);
 341                        sun4c_vacinfo.linesize =
 342                         prom_getintdefault(prom_root_node, "vac-linesize", 16);
 343                }
 344                sun4c_vacinfo.do_hwflushes =
 345                 prom_getintdefault(prom_root_node, "vac-hwflush", 0);
 346
 347                if (sun4c_vacinfo.do_hwflushes == 0)
 348                        sun4c_vacinfo.do_hwflushes =
 349                         prom_getintdefault(prom_root_node, "vac_hwflush", 0);
 350
 351                if (sun4c_vacinfo.num_bytes != 65536) {
 352                        prom_printf("WEIRD Sun4C VAC cache size, "
 353                                    "tell sparclinux@vger.kernel.org");
 354                        prom_halt();
 355                }
 356        }
 357
 358        sun4c_vacinfo.num_lines =
 359                (sun4c_vacinfo.num_bytes / sun4c_vacinfo.linesize);
 360        switch (sun4c_vacinfo.linesize) {
 361        case 16:
 362                sun4c_vacinfo.log2lsize = 4;
 363                break;
 364        case 32:
 365                sun4c_vacinfo.log2lsize = 5;
 366                break;
 367        default:
 368                prom_printf("probe_vac: Didn't expect vac-linesize of %d, halting\n",
 369                            sun4c_vacinfo.linesize);
 370                prom_halt();
 371        };
 372
 373        sun4c_flush_all();
 374        sun4c_enable_vac();
 375}
 376
 377/* Patch instructions for the low level kernel fault handler. */
 378extern unsigned long invalid_segment_patch1, invalid_segment_patch1_ff;
 379extern unsigned long invalid_segment_patch2, invalid_segment_patch2_ff;
 380extern unsigned long invalid_segment_patch1_1ff, invalid_segment_patch2_1ff;
 381extern unsigned long num_context_patch1, num_context_patch1_16;
 382extern unsigned long num_context_patch2_16;
 383extern unsigned long vac_linesize_patch, vac_linesize_patch_32;
 384extern unsigned long vac_hwflush_patch1, vac_hwflush_patch1_on;
 385extern unsigned long vac_hwflush_patch2, vac_hwflush_patch2_on;
 386
 387#define PATCH_INSN(src, dst) do {       \
 388                daddr = &(dst);         \
 389                iaddr = &(src);         \
 390                *daddr = *iaddr;        \
 391        } while (0)
 392
 393static void __init patch_kernel_fault_handler(void)
 394{
 395        unsigned long *iaddr, *daddr;
 396
 397        switch (num_segmaps) {
 398                case 128:
 399                        /* Default, nothing to do. */
 400                        break;
 401                case 256:
 402                        PATCH_INSN(invalid_segment_patch1_ff,
 403                                   invalid_segment_patch1);
 404                        PATCH_INSN(invalid_segment_patch2_ff,
 405                                   invalid_segment_patch2);
 406                        break;
 407                case 512:
 408                        PATCH_INSN(invalid_segment_patch1_1ff,
 409                                   invalid_segment_patch1);
 410                        PATCH_INSN(invalid_segment_patch2_1ff,
 411                                   invalid_segment_patch2);
 412                        break;
 413                default:
 414                        prom_printf("Unhandled number of segmaps: %d\n",
 415                                    num_segmaps);
 416                        prom_halt();
 417        };
 418        switch (num_contexts) {
 419                case 8:
 420                        /* Default, nothing to do. */
 421                        break;
 422                case 16:
 423                        PATCH_INSN(num_context_patch1_16,
 424                                   num_context_patch1);
 425                        break;
 426                default:
 427                        prom_printf("Unhandled number of contexts: %d\n",
 428                                    num_contexts);
 429                        prom_halt();
 430        };
 431
 432        if (sun4c_vacinfo.do_hwflushes != 0) {
 433                PATCH_INSN(vac_hwflush_patch1_on, vac_hwflush_patch1);
 434                PATCH_INSN(vac_hwflush_patch2_on, vac_hwflush_patch2);
 435        } else {
 436                switch (sun4c_vacinfo.linesize) {
 437                case 16:
 438                        /* Default, nothing to do. */
 439                        break;
 440                case 32:
 441                        PATCH_INSN(vac_linesize_patch_32, vac_linesize_patch);
 442                        break;
 443                default:
 444                        prom_printf("Impossible VAC linesize %d, halting...\n",
 445                                    sun4c_vacinfo.linesize);
 446                        prom_halt();
 447                };
 448        }
 449}
 450
 451static void __init sun4c_probe_mmu(void)
 452{
 453        if (ARCH_SUN4) {
 454                switch (idprom->id_machtype) {
 455                case (SM_SUN4|SM_4_110):
 456                        prom_printf("No support for 4100 yet\n");
 457                        prom_halt();
 458                        num_segmaps = 256;
 459                        num_contexts = 8;
 460                        break;
 461
 462                case (SM_SUN4|SM_4_260):
 463                        /* should be 512 segmaps. when it get fixed */
 464                        num_segmaps = 256;
 465                        num_contexts = 16;
 466                        break;
 467
 468                case (SM_SUN4|SM_4_330):
 469                        num_segmaps = 256;
 470                        num_contexts = 16;
 471                        break;
 472
 473                case (SM_SUN4|SM_4_470):
 474                        /* should be 1024 segmaps. when it get fixed */
 475                        num_segmaps = 256;
 476                        num_contexts = 64;
 477                        break;
 478                default:
 479                        prom_printf("Invalid SUN4 model\n");
 480                        prom_halt();
 481                };
 482        } else {
 483                if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) ||
 484                    (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) {
 485                        /* Hardcode these just to be safe, PROM on SS1 does
 486                        * not have this info available in the root node.
 487                        */
 488                        num_segmaps = 128;
 489                        num_contexts = 8;
 490                } else {
 491                        num_segmaps =
 492                            prom_getintdefault(prom_root_node, "mmu-npmg", 128);
 493                        num_contexts =
 494                            prom_getintdefault(prom_root_node, "mmu-nctx", 0x8);
 495                }
 496        }
 497        patch_kernel_fault_handler();
 498}
 499
 500volatile unsigned long *sun4c_memerr_reg = NULL;
 501
 502void __init sun4c_probe_memerr_reg(void)
 503{
 504        int node;
 505        struct linux_prom_registers regs[1];
 506
 507        if (ARCH_SUN4) {
 508                sun4c_memerr_reg = ioremap(sun4_memreg_physaddr, PAGE_SIZE);
 509        } else {
 510                node = prom_getchild(prom_root_node);
 511                node = prom_searchsiblings(prom_root_node, "memory-error");
 512                if (!node)
 513                        return;
 514                if (prom_getproperty(node, "reg", (char *)regs, sizeof(regs)) <= 0)
 515                        return;
 516                /* hmm I think regs[0].which_io is zero here anyways */
 517                sun4c_memerr_reg = ioremap(regs[0].phys_addr, regs[0].reg_size);
 518        }
 519}
 520
 521static inline void sun4c_init_ss2_cache_bug(void)
 522{
 523        extern unsigned long start;
 524
 525        if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS2)) ||
 526            (idprom->id_machtype == (SM_SUN4C | SM_4C_IPX)) ||
 527            (idprom->id_machtype == (SM_SUN4 | SM_4_330)) ||
 528            (idprom->id_machtype == (SM_SUN4C | SM_4C_ELC))) {
 529                /* Whee.. */
 530                printk("SS2 cache bug detected, uncaching trap table page\n");
 531                sun4c_flush_page((unsigned int) &start);
 532                sun4c_put_pte(((unsigned long) &start),
 533                        (sun4c_get_pte((unsigned long) &start) | _SUN4C_PAGE_NOCACHE));
 534        }
 535}
 536
 537/* Addr is always aligned on a page boundary for us already. */
 538static int sun4c_map_dma_area(dma_addr_t *pba, unsigned long va,
 539    unsigned long addr, int len)
 540{
 541        unsigned long page, end;
 542
 543        *pba = addr;
 544
 545        end = PAGE_ALIGN((addr + len));
 546        while (addr < end) {
 547                page = va;
 548                sun4c_flush_page(page);
 549                page -= PAGE_OFFSET;
 550                page >>= PAGE_SHIFT;
 551                page |= (_SUN4C_PAGE_VALID | _SUN4C_PAGE_DIRTY |
 552                         _SUN4C_PAGE_NOCACHE | _SUN4C_PAGE_PRIV);
 553                sun4c_put_pte(addr, page);
 554                addr += PAGE_SIZE;
 555                va += PAGE_SIZE;
 556        }
 557
 558        return 0;
 559}
 560
 561static struct page *sun4c_translate_dvma(unsigned long busa)
 562{
 563        /* Fortunately for us, bus_addr == uncached_virt in sun4c. */
 564        unsigned long pte = sun4c_get_pte(busa);
 565        return pfn_to_page(pte & SUN4C_PFN_MASK);
 566}
 567
 568static void sun4c_unmap_dma_area(unsigned long busa, int len)
 569{
 570        /* Fortunately for us, bus_addr == uncached_virt in sun4c. */
 571        /* XXX Implement this */
 572}
 573
 574/* TLB management. */
 575
 576/* Don't change this struct without changing entry.S. This is used
 577 * in the in-window kernel fault handler, and you don't want to mess
 578 * with that. (See sun4c_fault in entry.S).
 579 */
 580struct sun4c_mmu_entry {
 581        struct sun4c_mmu_entry *next;
 582        struct sun4c_mmu_entry *prev;
 583        unsigned long vaddr;
 584        unsigned char pseg;
 585        unsigned char locked;
 586
 587        /* For user mappings only, and completely hidden from kernel
 588         * TLB miss code.
 589         */
 590        unsigned char ctx;
 591        struct sun4c_mmu_entry *lru_next;
 592        struct sun4c_mmu_entry *lru_prev;
 593};
 594
 595static struct sun4c_mmu_entry mmu_entry_pool[SUN4C_MAX_SEGMAPS];
 596
 597static void __init sun4c_init_mmu_entry_pool(void)
 598{
 599        int i;
 600
 601        for (i=0; i < SUN4C_MAX_SEGMAPS; i++) {
 602                mmu_entry_pool[i].pseg = i;
 603                mmu_entry_pool[i].next = NULL;
 604                mmu_entry_pool[i].prev = NULL;
 605                mmu_entry_pool[i].vaddr = 0;
 606                mmu_entry_pool[i].locked = 0;
 607                mmu_entry_pool[i].ctx = 0;
 608                mmu_entry_pool[i].lru_next = NULL;
 609                mmu_entry_pool[i].lru_prev = NULL;
 610        }
 611        mmu_entry_pool[invalid_segment].locked = 1;
 612}
 613
 614static inline void fix_permissions(unsigned long vaddr, unsigned long bits_on,
 615                                   unsigned long bits_off)
 616{
 617        unsigned long start, end;
 618
 619        end = vaddr + SUN4C_REAL_PGDIR_SIZE;
 620        for (start = vaddr; start < end; start += PAGE_SIZE)
 621                if (sun4c_get_pte(start) & _SUN4C_PAGE_VALID)
 622                        sun4c_put_pte(start, (sun4c_get_pte(start) | bits_on) &
 623                                      ~bits_off);
 624}
 625
 626static inline void sun4c_init_map_kernelprom(unsigned long kernel_end)
 627{
 628        unsigned long vaddr;
 629        unsigned char pseg, ctx;
 630#ifdef CONFIG_SUN4
 631        /* sun4/110 and 260 have no kadb. */
 632        if ((idprom->id_machtype != (SM_SUN4 | SM_4_260)) && 
 633            (idprom->id_machtype != (SM_SUN4 | SM_4_110))) {
 634#endif
 635        for (vaddr = KADB_DEBUGGER_BEGVM;
 636             vaddr < LINUX_OPPROM_ENDVM;
 637             vaddr += SUN4C_REAL_PGDIR_SIZE) {
 638                pseg = sun4c_get_segmap(vaddr);
 639                if (pseg != invalid_segment) {
 640                        mmu_entry_pool[pseg].locked = 1;
 641                        for (ctx = 0; ctx < num_contexts; ctx++)
 642                                prom_putsegment(ctx, vaddr, pseg);
 643                        fix_permissions(vaddr, _SUN4C_PAGE_PRIV, 0);
 644                }
 645        }
 646#ifdef CONFIG_SUN4
 647        }
 648#endif
 649        for (vaddr = KERNBASE; vaddr < kernel_end; vaddr += SUN4C_REAL_PGDIR_SIZE) {
 650                pseg = sun4c_get_segmap(vaddr);
 651                mmu_entry_pool[pseg].locked = 1;
 652                for (ctx = 0; ctx < num_contexts; ctx++)
 653                        prom_putsegment(ctx, vaddr, pseg);
 654                fix_permissions(vaddr, _SUN4C_PAGE_PRIV, _SUN4C_PAGE_NOCACHE);
 655        }
 656}
 657
 658static void __init sun4c_init_lock_area(unsigned long start, unsigned long end)
 659{
 660        int i, ctx;
 661
 662        while (start < end) {
 663                for (i = 0; i < invalid_segment; i++)
 664                        if (!mmu_entry_pool[i].locked)
 665                                break;
 666                mmu_entry_pool[i].locked = 1;
 667                sun4c_init_clean_segmap(i);
 668                for (ctx = 0; ctx < num_contexts; ctx++)
 669                        prom_putsegment(ctx, start, mmu_entry_pool[i].pseg);
 670                start += SUN4C_REAL_PGDIR_SIZE;
 671        }
 672}
 673
 674/* Don't change this struct without changing entry.S. This is used
 675 * in the in-window kernel fault handler, and you don't want to mess
 676 * with that. (See sun4c_fault in entry.S).
 677 */
 678struct sun4c_mmu_ring {
 679        struct sun4c_mmu_entry ringhd;
 680        int num_entries;
 681};
 682
 683static struct sun4c_mmu_ring sun4c_context_ring[SUN4C_MAX_CONTEXTS]; /* used user entries */
 684static struct sun4c_mmu_ring sun4c_ufree_ring;       /* free user entries */
 685static struct sun4c_mmu_ring sun4c_ulru_ring;        /* LRU user entries */
 686struct sun4c_mmu_ring sun4c_kernel_ring;      /* used kernel entries */
 687struct sun4c_mmu_ring sun4c_kfree_ring;       /* free kernel entries */
 688
 689static inline void sun4c_init_rings(void)
 690{
 691        int i;
 692
 693        for (i = 0; i < SUN4C_MAX_CONTEXTS; i++) {
 694                sun4c_context_ring[i].ringhd.next =
 695                        sun4c_context_ring[i].ringhd.prev =
 696                        &sun4c_context_ring[i].ringhd;
 697                sun4c_context_ring[i].num_entries = 0;
 698        }
 699        sun4c_ufree_ring.ringhd.next = sun4c_ufree_ring.ringhd.prev =
 700                &sun4c_ufree_ring.ringhd;
 701        sun4c_ufree_ring.num_entries = 0;
 702        sun4c_ulru_ring.ringhd.lru_next = sun4c_ulru_ring.ringhd.lru_prev =
 703                &sun4c_ulru_ring.ringhd;
 704        sun4c_ulru_ring.num_entries = 0;
 705        sun4c_kernel_ring.ringhd.next = sun4c_kernel_ring.ringhd.prev =
 706                &sun4c_kernel_ring.ringhd;
 707        sun4c_kernel_ring.num_entries = 0;
 708        sun4c_kfree_ring.ringhd.next = sun4c_kfree_ring.ringhd.prev =
 709                &sun4c_kfree_ring.ringhd;
 710        sun4c_kfree_ring.num_entries = 0;
 711}
 712
 713static void add_ring(struct sun4c_mmu_ring *ring,
 714                     struct sun4c_mmu_entry *entry)
 715{
 716        struct sun4c_mmu_entry *head = &ring->ringhd;
 717
 718        entry->prev = head;
 719        (entry->next = head->next)->prev = entry;
 720        head->next = entry;
 721        ring->num_entries++;
 722}
 723
 724static __inline__ void add_lru(struct sun4c_mmu_entry *entry)
 725{
 726        struct sun4c_mmu_ring *ring = &sun4c_ulru_ring;
 727        struct sun4c_mmu_entry *head = &ring->ringhd;
 728
 729        entry->lru_next = head;
 730        (entry->lru_prev = head->lru_prev)->lru_next = entry;
 731        head->lru_prev = entry;
 732}
 733
 734static void add_ring_ordered(struct sun4c_mmu_ring *ring,
 735                             struct sun4c_mmu_entry *entry)
 736{
 737        struct sun4c_mmu_entry *head = &ring->ringhd;
 738        unsigned long addr = entry->vaddr;
 739
 740        while ((head->next != &ring->ringhd) && (head->next->vaddr < addr))
 741                head = head->next;
 742
 743        entry->prev = head;
 744        (entry->next = head->next)->prev = entry;
 745        head->next = entry;
 746        ring->num_entries++;
 747
 748        add_lru(entry);
 749}
 750
 751static __inline__ void remove_ring(struct sun4c_mmu_ring *ring,
 752                                   struct sun4c_mmu_entry *entry)
 753{
 754        struct sun4c_mmu_entry *next = entry->next;
 755
 756        (next->prev = entry->prev)->next = next;
 757        ring->num_entries--;
 758}
 759
 760static void remove_lru(struct sun4c_mmu_entry *entry)
 761{
 762        struct sun4c_mmu_entry *next = entry->lru_next;
 763
 764        (next->lru_prev = entry->lru_prev)->lru_next = next;
 765}
 766
 767static void free_user_entry(int ctx, struct sun4c_mmu_entry *entry)
 768{
 769        remove_ring(sun4c_context_ring+ctx, entry);
 770        remove_lru(entry);
 771        add_ring(&sun4c_ufree_ring, entry);
 772}
 773
 774static void free_kernel_entry(struct sun4c_mmu_entry *entry,
 775                              struct sun4c_mmu_ring *ring)
 776{
 777        remove_ring(ring, entry);
 778        add_ring(&sun4c_kfree_ring, entry);
 779}
 780
 781static void __init sun4c_init_fill_kernel_ring(int howmany)
 782{
 783        int i;
 784
 785        while (howmany) {
 786                for (i = 0; i < invalid_segment; i++)
 787                        if (!mmu_entry_pool[i].locked)
 788                                break;
 789                mmu_entry_pool[i].locked = 1;
 790                sun4c_init_clean_segmap(i);
 791                add_ring(&sun4c_kfree_ring, &mmu_entry_pool[i]);
 792                howmany--;
 793        }
 794}
 795
 796static void __init sun4c_init_fill_user_ring(void)
 797{
 798        int i;
 799
 800        for (i = 0; i < invalid_segment; i++) {
 801                if (mmu_entry_pool[i].locked)
 802                        continue;
 803                sun4c_init_clean_segmap(i);
 804                add_ring(&sun4c_ufree_ring, &mmu_entry_pool[i]);
 805        }
 806}
 807
 808static void sun4c_kernel_unmap(struct sun4c_mmu_entry *kentry)
 809{
 810        int savectx, ctx;
 811
 812        savectx = sun4c_get_context();
 813        for (ctx = 0; ctx < num_contexts; ctx++) {
 814                sun4c_set_context(ctx);
 815                sun4c_put_segmap(kentry->vaddr, invalid_segment);
 816        }
 817        sun4c_set_context(savectx);
 818}
 819
 820static void sun4c_kernel_map(struct sun4c_mmu_entry *kentry)
 821{
 822        int savectx, ctx;
 823
 824        savectx = sun4c_get_context();
 825        for (ctx = 0; ctx < num_contexts; ctx++) {
 826                sun4c_set_context(ctx);
 827                sun4c_put_segmap(kentry->vaddr, kentry->pseg);
 828        }
 829        sun4c_set_context(savectx);
 830}
 831
 832#define sun4c_user_unmap(__entry) \
 833        sun4c_put_segmap((__entry)->vaddr, invalid_segment)
 834
 835static void sun4c_demap_context(struct sun4c_mmu_ring *crp, unsigned char ctx)
 836{
 837        struct sun4c_mmu_entry *head = &crp->ringhd;
 838        unsigned long flags;
 839
 840        local_irq_save(flags);
 841        if (head->next != head) {
 842                struct sun4c_mmu_entry *entry = head->next;
 843                int savectx = sun4c_get_context();
 844
 845                flush_user_windows();
 846                sun4c_set_context(ctx);
 847                sun4c_flush_context();
 848                do {
 849                        struct sun4c_mmu_entry *next = entry->next;
 850
 851                        sun4c_user_unmap(entry);
 852                        free_user_entry(ctx, entry);
 853
 854                        entry = next;
 855                } while (entry != head);
 856                sun4c_set_context(savectx);
 857        }
 858        local_irq_restore(flags);
 859}
 860
 861static int sun4c_user_taken_entries;  /* This is how much we have.             */
 862static int max_user_taken_entries;    /* This limits us and prevents deadlock. */
 863
 864static struct sun4c_mmu_entry *sun4c_kernel_strategy(void)
 865{
 866        struct sun4c_mmu_entry *this_entry;
 867
 868        /* If some are free, return first one. */
 869        if (sun4c_kfree_ring.num_entries) {
 870                this_entry = sun4c_kfree_ring.ringhd.next;
 871                return this_entry;
 872        }
 873
 874        /* Else free one up. */
 875        this_entry = sun4c_kernel_ring.ringhd.prev;
 876        sun4c_flush_segment(this_entry->vaddr);
 877        sun4c_kernel_unmap(this_entry);
 878        free_kernel_entry(this_entry, &sun4c_kernel_ring);
 879        this_entry = sun4c_kfree_ring.ringhd.next;
 880
 881        return this_entry;
 882}
 883
 884/* Using this method to free up mmu entries eliminates a lot of
 885 * potential races since we have a kernel that incurs tlb
 886 * replacement faults.  There may be performance penalties.
 887 *
 888 * NOTE: Must be called with interrupts disabled.
 889 */
 890static struct sun4c_mmu_entry *sun4c_user_strategy(void)
 891{
 892        struct sun4c_mmu_entry *entry;
 893        unsigned char ctx;
 894        int savectx;
 895
 896        /* If some are free, return first one. */
 897        if (sun4c_ufree_ring.num_entries) {
 898                entry = sun4c_ufree_ring.ringhd.next;
 899                goto unlink_out;
 900        }
 901
 902        if (sun4c_user_taken_entries) {
 903                entry = sun4c_kernel_strategy();
 904                sun4c_user_taken_entries--;
 905                goto kunlink_out;
 906        }
 907
 908        /* Grab from the beginning of the LRU list. */
 909        entry = sun4c_ulru_ring.ringhd.lru_next;
 910        ctx = entry->ctx;
 911
 912        savectx = sun4c_get_context();
 913        flush_user_windows();
 914        sun4c_set_context(ctx);
 915        sun4c_flush_segment(entry->vaddr);
 916        sun4c_user_unmap(entry);
 917        remove_ring(sun4c_context_ring + ctx, entry);
 918        remove_lru(entry);
 919        sun4c_set_context(savectx);
 920
 921        return entry;
 922
 923unlink_out:
 924        remove_ring(&sun4c_ufree_ring, entry);
 925        return entry;
 926kunlink_out:
 927        remove_ring(&sun4c_kfree_ring, entry);
 928        return entry;
 929}
 930
 931/* NOTE: Must be called with interrupts disabled. */
 932void sun4c_grow_kernel_ring(void)
 933{
 934        struct sun4c_mmu_entry *entry;
 935
 936        /* Prevent deadlock condition. */
 937        if (sun4c_user_taken_entries >= max_user_taken_entries)
 938                return;
 939
 940        if (sun4c_ufree_ring.num_entries) {
 941                entry = sun4c_ufree_ring.ringhd.next;
 942                remove_ring(&sun4c_ufree_ring, entry);
 943                add_ring(&sun4c_kfree_ring, entry);
 944                sun4c_user_taken_entries++;
 945        }
 946}
 947
 948/* 2 page buckets for task struct and kernel stack allocation.
 949 *
 950 * TASK_STACK_BEGIN
 951 * bucket[0]
 952 * bucket[1]
 953 *   [ ... ]
 954 * bucket[NR_TASK_BUCKETS-1]
 955 * TASK_STACK_BEGIN + (sizeof(struct task_bucket) * NR_TASK_BUCKETS)
 956 *
 957 * Each slot looks like:
 958 *
 959 *  page 1 --  task struct + beginning of kernel stack
 960 *  page 2 --  rest of kernel stack
 961 */
 962
 963union task_union *sun4c_bucket[NR_TASK_BUCKETS];
 964
 965static int sun4c_lowbucket_avail;
 966
 967#define BUCKET_EMPTY     ((union task_union *) 0)
 968#define BUCKET_SHIFT     (PAGE_SHIFT + 1)        /* log2(sizeof(struct task_bucket)) */
 969#define BUCKET_SIZE      (1 << BUCKET_SHIFT)
 970#define BUCKET_NUM(addr) ((((addr) - SUN4C_LOCK_VADDR) >> BUCKET_SHIFT))
 971#define BUCKET_ADDR(num) (((num) << BUCKET_SHIFT) + SUN4C_LOCK_VADDR)
 972#define BUCKET_PTE(page)       \
 973        ((((page) - PAGE_OFFSET) >> PAGE_SHIFT) | pgprot_val(SUN4C_PAGE_KERNEL))
 974#define BUCKET_PTE_PAGE(pte)   \
 975        (PAGE_OFFSET + (((pte) & SUN4C_PFN_MASK) << PAGE_SHIFT))
 976
 977static void get_locked_segment(unsigned long addr)
 978{
 979        struct sun4c_mmu_entry *stolen;
 980        unsigned long flags;
 981
 982        local_irq_save(flags);
 983        addr &= SUN4C_REAL_PGDIR_MASK;
 984        stolen = sun4c_user_strategy();
 985        max_user_taken_entries--;
 986        stolen->vaddr = addr;
 987        flush_user_windows();
 988        sun4c_kernel_map(stolen);
 989        local_irq_restore(flags);
 990}
 991
 992static void free_locked_segment(unsigned long addr)
 993{
 994        struct sun4c_mmu_entry *entry;
 995        unsigned long flags;
 996        unsigned char pseg;
 997
 998        local_irq_save(flags);
 999        addr &= SUN4C_REAL_PGDIR_MASK;
1000        pseg = sun4c_get_segmap(addr);
1001        entry = &mmu_entry_pool[pseg];
1002
1003        flush_user_windows();
1004        sun4c_flush_segment(addr);
1005        sun4c_kernel_unmap(entry);
1006        add_ring(&sun4c_ufree_ring, entry);
1007        max_user_taken_entries++;
1008        local_irq_restore(flags);
1009}
1010
1011static inline void garbage_collect(int entry)
1012{
1013        int start, end;
1014
1015        /* 32 buckets per segment... */
1016        entry &= ~31;
1017        start = entry;
1018        for (end = (start + 32); start < end; start++)
1019                if (sun4c_bucket[start] != BUCKET_EMPTY)
1020                        return;
1021
1022        /* Entire segment empty, release it. */
1023        free_locked_segment(BUCKET_ADDR(entry));
1024}
1025
1026static struct thread_info *sun4c_alloc_thread_info(void)
1027{
1028        unsigned long addr, pages;
1029        int entry;
1030
1031        pages = __get_free_pages(GFP_KERNEL, THREAD_INFO_ORDER);
1032        if (!pages)
1033                return NULL;
1034
1035        for (entry = sun4c_lowbucket_avail; entry < NR_TASK_BUCKETS; entry++)
1036                if (sun4c_bucket[entry] == BUCKET_EMPTY)
1037                        break;
1038        if (entry == NR_TASK_BUCKETS) {
1039                free_pages(pages, THREAD_INFO_ORDER);
1040                return NULL;
1041        }
1042        if (entry >= sun4c_lowbucket_avail)
1043                sun4c_lowbucket_avail = entry + 1;
1044
1045        addr = BUCKET_ADDR(entry);
1046        sun4c_bucket[entry] = (union task_union *) addr;
1047        if(sun4c_get_segmap(addr) == invalid_segment)
1048                get_locked_segment(addr);
1049
1050        /* We are changing the virtual color of the page(s)
1051         * so we must flush the cache to guarantee consistency.
1052         */
1053        sun4c_flush_page(pages);
1054#ifndef CONFIG_SUN4     
1055        sun4c_flush_page(pages + PAGE_SIZE);
1056#endif
1057
1058        sun4c_put_pte(addr, BUCKET_PTE(pages));
1059#ifndef CONFIG_SUN4     
1060        sun4c_put_pte(addr + PAGE_SIZE, BUCKET_PTE(pages + PAGE_SIZE));
1061#endif
1062
1063#ifdef CONFIG_DEBUG_STACK_USAGE
1064        memset((void *)addr, 0, PAGE_SIZE << THREAD_INFO_ORDER);
1065#endif /* DEBUG_STACK_USAGE */
1066
1067        return (struct thread_info *) addr;
1068}
1069
1070static void sun4c_free_thread_info(struct thread_info *ti)
1071{
1072        unsigned long tiaddr = (unsigned long) ti;
1073        unsigned long pages = BUCKET_PTE_PAGE(sun4c_get_pte(tiaddr));
1074        int entry = BUCKET_NUM(tiaddr);
1075
1076        /* We are deleting a mapping, so the flush here is mandatory. */
1077        sun4c_flush_page(tiaddr);
1078#ifndef CONFIG_SUN4     
1079        sun4c_flush_page(tiaddr + PAGE_SIZE);
1080#endif
1081        sun4c_put_pte(tiaddr, 0);
1082#ifndef CONFIG_SUN4     
1083        sun4c_put_pte(tiaddr + PAGE_SIZE, 0);
1084#endif
1085        sun4c_bucket[entry] = BUCKET_EMPTY;
1086        if (entry < sun4c_lowbucket_avail)
1087                sun4c_lowbucket_avail = entry;
1088
1089        free_pages(pages, THREAD_INFO_ORDER);
1090        garbage_collect(entry);
1091}
1092
1093static void __init sun4c_init_buckets(void)
1094{
1095        int entry;
1096
1097        if (sizeof(union thread_union) != (PAGE_SIZE << THREAD_INFO_ORDER)) {
1098                extern void thread_info_size_is_bolixed_pete(void);
1099                thread_info_size_is_bolixed_pete();
1100        }
1101
1102        for (entry = 0; entry < NR_TASK_BUCKETS; entry++)
1103                sun4c_bucket[entry] = BUCKET_EMPTY;
1104        sun4c_lowbucket_avail = 0;
1105}
1106
1107static unsigned long sun4c_iobuffer_start;
1108static unsigned long sun4c_iobuffer_end;
1109static unsigned long sun4c_iobuffer_high;
1110static unsigned long *sun4c_iobuffer_map;
1111static int iobuffer_map_size;
1112
1113/*
1114 * Alias our pages so they do not cause a trap.
1115 * Also one page may be aliased into several I/O areas and we may
1116 * finish these I/O separately.
1117 */
1118static char *sun4c_lockarea(char *vaddr, unsigned long size)
1119{
1120        unsigned long base, scan;
1121        unsigned long npages;
1122        unsigned long vpage;
1123        unsigned long pte;
1124        unsigned long apage;
1125        unsigned long high;
1126        unsigned long flags;
1127
1128        npages = (((unsigned long)vaddr & ~PAGE_MASK) +
1129                  size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
1130
1131        scan = 0;
1132        local_irq_save(flags);
1133        for (;;) {
1134                scan = find_next_zero_bit(sun4c_iobuffer_map,
1135                                          iobuffer_map_size, scan);
1136                if ((base = scan) + npages > iobuffer_map_size) goto abend;
1137                for (;;) {
1138                        if (scan >= base + npages) goto found;
1139                        if (test_bit(scan, sun4c_iobuffer_map)) break;
1140                        scan++;
1141                }
1142        }
1143
1144found:
1145        high = ((base + npages) << PAGE_SHIFT) + sun4c_iobuffer_start;
1146        high = SUN4C_REAL_PGDIR_ALIGN(high);
1147        while (high > sun4c_iobuffer_high) {
1148                get_locked_segment(sun4c_iobuffer_high);
1149                sun4c_iobuffer_high += SUN4C_REAL_PGDIR_SIZE;
1150        }
1151
1152        vpage = ((unsigned long) vaddr) & PAGE_MASK;
1153        for (scan = base; scan < base+npages; scan++) {
1154                pte = ((vpage-PAGE_OFFSET) >> PAGE_SHIFT);
1155                pte |= pgprot_val(SUN4C_PAGE_KERNEL);
1156                pte |= _SUN4C_PAGE_NOCACHE;
1157                set_bit(scan, sun4c_iobuffer_map);
1158                apage = (scan << PAGE_SHIFT) + sun4c_iobuffer_start;
1159
1160                /* Flush original mapping so we see the right things later. */
1161                sun4c_flush_page(vpage);
1162
1163                sun4c_put_pte(apage, pte);
1164                vpage += PAGE_SIZE;
1165        }
1166        local_irq_restore(flags);
1167        return (char *) ((base << PAGE_SHIFT) + sun4c_iobuffer_start +
1168                         (((unsigned long) vaddr) & ~PAGE_MASK));
1169
1170abend:
1171        local_irq_restore(flags);
1172        printk("DMA vaddr=0x%p size=%08lx\n", vaddr, size);
1173        panic("Out of iobuffer table");
1174        return NULL;
1175}
1176
1177static void sun4c_unlockarea(char *vaddr, unsigned long size)
1178{
1179        unsigned long vpage, npages;
1180        unsigned long flags;
1181        int scan, high;
1182
1183        vpage = (unsigned long)vaddr & PAGE_MASK;
1184        npages = (((unsigned long)vaddr & ~PAGE_MASK) +
1185                  size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
1186
1187        local_irq_save(flags);
1188        while (npages != 0) {
1189                --npages;
1190
1191                /* This mapping is marked non-cachable, no flush necessary. */
1192                sun4c_put_pte(vpage, 0);
1193                clear_bit((vpage - sun4c_iobuffer_start) >> PAGE_SHIFT,
1194                          sun4c_iobuffer_map);
1195                vpage += PAGE_SIZE;
1196        }
1197
1198        /* garbage collect */
1199        scan = (sun4c_iobuffer_high - sun4c_iobuffer_start) >> PAGE_SHIFT;
1200        while (scan >= 0 && !sun4c_iobuffer_map[scan >> 5])
1201                scan -= 32;
1202        scan += 32;
1203        high = sun4c_iobuffer_start + (scan << PAGE_SHIFT);
1204        high = SUN4C_REAL_PGDIR_ALIGN(high) + SUN4C_REAL_PGDIR_SIZE;
1205        while (high < sun4c_iobuffer_high) {
1206                sun4c_iobuffer_high -= SUN4C_REAL_PGDIR_SIZE;
1207                free_locked_segment(sun4c_iobuffer_high);
1208        }
1209        local_irq_restore(flags);
1210}
1211
1212/* Note the scsi code at init time passes to here buffers
1213 * which sit on the kernel stack, those are already locked
1214 * by implication and fool the page locking code above
1215 * if passed to by mistake.
1216 */
1217static __u32 sun4c_get_scsi_one(char *bufptr, unsigned long len, struct sbus_bus *sbus)
1218{
1219        unsigned long page;
1220
1221        page = ((unsigned long)bufptr) & PAGE_MASK;
1222        if (!virt_addr_valid(page)) {
1223                sun4c_flush_page(page);
1224                return (__u32)bufptr; /* already locked */
1225        }
1226        return (__u32)sun4c_lockarea(bufptr, len);
1227}
1228
1229static void sun4c_get_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus)
1230{
1231        while (sz != 0) {
1232                --sz;
1233                sg[sz].dvma_address = (__u32)sun4c_lockarea(page_address(sg[sz].page) + sg[sz].offset, sg[sz].length);
1234                sg[sz].dvma_length = sg[sz].length;
1235        }
1236}
1237
1238static void sun4c_release_scsi_one(__u32 bufptr, unsigned long len, struct sbus_bus *sbus)
1239{
1240        if (bufptr < sun4c_iobuffer_start)
1241                return; /* On kernel stack or similar, see above */
1242        sun4c_unlockarea((char *)bufptr, len);
1243}
1244
1245static void sun4c_release_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus)
1246{
1247        while (sz != 0) {
1248                --sz;
1249                sun4c_unlockarea((char *)sg[sz].dvma_address, sg[sz].length);
1250        }
1251}
1252
1253#define TASK_ENTRY_SIZE    BUCKET_SIZE /* see above */
1254#define LONG_ALIGN(x) (((x)+(sizeof(long))-1)&~((sizeof(long))-1))
1255
1256struct vm_area_struct sun4c_kstack_vma;
1257
1258static void __init sun4c_init_lock_areas(void)
1259{
1260        unsigned long sun4c_taskstack_start;
1261        unsigned long sun4c_taskstack_end;
1262        int bitmap_size;
1263
1264        sun4c_init_buckets();
1265        sun4c_taskstack_start = SUN4C_LOCK_VADDR;
1266        sun4c_taskstack_end = (sun4c_taskstack_start +
1267                               (TASK_ENTRY_SIZE * NR_TASK_BUCKETS));
1268        if (sun4c_taskstack_end >= SUN4C_LOCK_END) {
1269                prom_printf("Too many tasks, decrease NR_TASK_BUCKETS please.\n");
1270                prom_halt();
1271        }
1272
1273        sun4c_iobuffer_start = sun4c_iobuffer_high =
1274                                SUN4C_REAL_PGDIR_ALIGN(sun4c_taskstack_end);
1275        sun4c_iobuffer_end = SUN4C_LOCK_END;
1276        bitmap_size = (sun4c_iobuffer_end - sun4c_iobuffer_start) >> PAGE_SHIFT;
1277        bitmap_size = (bitmap_size + 7) >> 3;
1278        bitmap_size = LONG_ALIGN(bitmap_size);
1279        iobuffer_map_size = bitmap_size << 3;
1280        sun4c_iobuffer_map = __alloc_bootmem(bitmap_size, SMP_CACHE_BYTES, 0UL);
1281        memset((void *) sun4c_iobuffer_map, 0, bitmap_size);
1282
1283        sun4c_kstack_vma.vm_mm = &init_mm;
1284        sun4c_kstack_vma.vm_start = sun4c_taskstack_start;
1285        sun4c_kstack_vma.vm_end = sun4c_taskstack_end;
1286        sun4c_kstack_vma.vm_page_prot = PAGE_SHARED;
1287        sun4c_kstack_vma.vm_flags = VM_READ | VM_WRITE | VM_EXEC;
1288        insert_vm_struct(&init_mm, &sun4c_kstack_vma);
1289}
1290
1291/* Cache flushing on the sun4c. */
1292static void sun4c_flush_cache_all(void)
1293{
1294        unsigned long begin, end;
1295
1296        flush_user_windows();
1297        begin = (KERNBASE + SUN4C_REAL_PGDIR_SIZE);
1298        end = (begin + SUN4C_VAC_SIZE);
1299
1300        if (sun4c_vacinfo.linesize == 32) {
1301                while (begin < end) {
1302                        __asm__ __volatile__(
1303                        "ld     [%0 + 0x00], %%g0\n\t"
1304                        "ld     [%0 + 0x20], %%g0\n\t"
1305                        "ld     [%0 + 0x40], %%g0\n\t"
1306                        "ld     [%0 + 0x60], %%g0\n\t"
1307                        "ld     [%0 + 0x80], %%g0\n\t"
1308                        "ld     [%0 + 0xa0], %%g0\n\t"
1309                        "ld     [%0 + 0xc0], %%g0\n\t"
1310                        "ld     [%0 + 0xe0], %%g0\n\t"
1311                        "ld     [%0 + 0x100], %%g0\n\t"
1312                        "ld     [%0 + 0x120], %%g0\n\t"
1313                        "ld     [%0 + 0x140], %%g0\n\t"
1314                        "ld     [%0 + 0x160], %%g0\n\t"
1315                        "ld     [%0 + 0x180], %%g0\n\t"
1316                        "ld     [%0 + 0x1a0], %%g0\n\t"
1317                        "ld     [%0 + 0x1c0], %%g0\n\t"
1318                        "ld     [%0 + 0x1e0], %%g0\n"
1319                        : : "r" (begin));
1320                        begin += 512;
1321                }
1322        } else {
1323                while (begin < end) {
1324                        __asm__ __volatile__(
1325                        "ld     [%0 + 0x00], %%g0\n\t"
1326                        "ld     [%0 + 0x10], %%g0\n\t"
1327                        "ld     [%0 + 0x20], %%g0\n\t"
1328                        "ld     [%0 + 0x30], %%g0\n\t"
1329                        "ld     [%0 + 0x40], %%g0\n\t"
1330                        "ld     [%0 + 0x50], %%g0\n\t"
1331                        "ld     [%0 + 0x60], %%g0\n\t"
1332                        "ld     [%0 + 0x70], %%g0\n\t"
1333                        "ld     [%0 + 0x80], %%g0\n\t"
1334                        "ld     [%0 + 0x90], %%g0\n\t"
1335                        "ld     [%0 + 0xa0], %%g0\n\t"
1336                        "ld     [%0 + 0xb0], %%g0\n\t"
1337                        "ld     [%0 + 0xc0], %%g0\n\t"
1338                        "ld     [%0 + 0xd0], %%g0\n\t"
1339                        "ld     [%0 + 0xe0], %%g0\n\t"
1340                        "ld     [%0 + 0xf0], %%g0\n"
1341                        : : "r" (begin));
1342                        begin += 256;
1343                }
1344        }
1345}
1346
1347static void sun4c_flush_cache_mm(struct mm_struct *mm)
1348{
1349        int new_ctx = mm->context;
1350
1351        if (new_ctx != NO_CONTEXT) {
1352                flush_user_windows();
1353
1354                if (sun4c_context_ring[new_ctx].num_entries) {
1355                        struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
1356                        unsigned long flags;
1357
1358                        local_irq_save(flags);
1359                        if (head->next != head) {
1360                                struct sun4c_mmu_entry *entry = head->next;
1361                                int savectx = sun4c_get_context();
1362
1363                                sun4c_set_context(new_ctx);
1364                                sun4c_flush_context();
1365                                do {
1366                                        struct sun4c_mmu_entry *next = entry->next;
1367
1368                                        sun4c_user_unmap(entry);
1369                                        free_user_entry(new_ctx, entry);
1370
1371                                        entry = next;
1372                                } while (entry != head);
1373                                sun4c_set_context(savectx);
1374                        }
1375                        local_irq_restore(flags);
1376                }
1377        }
1378}
1379
1380static void sun4c_flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end)
1381{
1382        struct mm_struct *mm = vma->vm_mm;
1383        int new_ctx = mm->context;
1384
1385        if (new_ctx != NO_CONTEXT) {
1386                struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
1387                struct sun4c_mmu_entry *entry;
1388                unsigned long flags;
1389
1390                flush_user_windows();
1391
1392                local_irq_save(flags);
1393                /* All user segmap chains are ordered on entry->vaddr. */
1394                for (entry = head->next;
1395                     (entry != head) && ((entry->vaddr+SUN4C_REAL_PGDIR_SIZE) < start);
1396                     entry = entry->next)
1397                        ;
1398
1399                /* Tracing various job mixtures showed that this conditional
1400                 * only passes ~35% of the time for most worse case situations,
1401                 * therefore we avoid all of this gross overhead ~65% of the time.
1402                 */
1403                if ((entry != head) && (entry->vaddr < end)) {
1404                        int octx = sun4c_get_context();
1405                        sun4c_set_context(new_ctx);
1406
1407                        /* At this point, always, (start >= entry->vaddr) and
1408                         * (entry->vaddr < end), once the latter condition
1409                         * ceases to hold, or we hit the end of the list, we
1410                         * exit the loop.  The ordering of all user allocated
1411                         * segmaps makes this all work out so beautifully.
1412                         */
1413                        do {
1414                                struct sun4c_mmu_entry *next = entry->next;
1415                                unsigned long realend;
1416
1417                                /* "realstart" is always >= entry->vaddr */
1418                                realend = entry->vaddr + SUN4C_REAL_PGDIR_SIZE;
1419                                if (end < realend)
1420                                        realend = end;
1421                                if ((realend - entry->vaddr) <= (PAGE_SIZE << 3)) {
1422                                        unsigned long page = entry->vaddr;
1423                                        while (page < realend) {
1424                                                sun4c_flush_page(page);
1425                                                page += PAGE_SIZE;
1426                                        }
1427                                } else {
1428                                        sun4c_flush_segment(entry->vaddr);
1429                                        sun4c_user_unmap(entry);
1430                                        free_user_entry(new_ctx, entry);
1431                                }
1432                                entry = next;
1433                        } while ((entry != head) && (entry->vaddr < end));
1434                        sun4c_set_context(octx);
1435                }
1436                local_irq_restore(flags);
1437        }
1438}
1439
1440static void sun4c_flush_cache_page(struct vm_area_struct *vma, unsigned long page)
1441{
1442        struct mm_struct *mm = vma->vm_mm;
1443        int new_ctx = mm->context;
1444
1445        /* Sun4c has no separate I/D caches so cannot optimize for non
1446         * text page flushes.
1447         */
1448        if (new_ctx != NO_CONTEXT) {
1449                int octx = sun4c_get_context();
1450                unsigned long flags;
1451
1452                flush_user_windows();
1453                local_irq_save(flags);
1454                sun4c_set_context(new_ctx);
1455                sun4c_flush_page(page);
1456                sun4c_set_context(octx);
1457                local_irq_restore(flags);
1458        }
1459}
1460
1461static void sun4c_flush_page_to_ram(unsigned long page)
1462{
1463        unsigned long flags;
1464
1465        local_irq_save(flags);
1466        sun4c_flush_page(page);
1467        local_irq_restore(flags);
1468}
1469
1470/* Sun4c cache is unified, both instructions and data live there, so
1471 * no need to flush the on-stack instructions for new signal handlers.
1472 */
1473static void sun4c_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr)
1474{
1475}
1476
1477/* TLB flushing on the sun4c.  These routines count on the cache
1478 * flushing code to flush the user register windows so that we need
1479 * not do so when we get here.
1480 */
1481
1482static void sun4c_flush_tlb_all(void)
1483{
1484        struct sun4c_mmu_entry *this_entry, *next_entry;
1485        unsigned long flags;
1486        int savectx, ctx;
1487
1488        local_irq_save(flags);
1489        this_entry = sun4c_kernel_ring.ringhd.next;
1490        savectx = sun4c_get_context();
1491        flush_user_windows();
1492        while (sun4c_kernel_ring.num_entries) {
1493                next_entry = this_entry->next;
1494                sun4c_flush_segment(this_entry->vaddr);
1495                for (ctx = 0; ctx < num_contexts; ctx++) {
1496                        sun4c_set_context(ctx);
1497                        sun4c_put_segmap(this_entry->vaddr, invalid_segment);
1498                }
1499                free_kernel_entry(this_entry, &sun4c_kernel_ring);
1500                this_entry = next_entry;
1501        }
1502        sun4c_set_context(savectx);
1503        local_irq_restore(flags);
1504}
1505
1506static void sun4c_flush_tlb_mm(struct mm_struct *mm)
1507{
1508        int new_ctx = mm->context;
1509
1510        if (new_ctx != NO_CONTEXT) {
1511                struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
1512                unsigned long flags;
1513
1514                local_irq_save(flags);
1515                if (head->next != head) {
1516                        struct sun4c_mmu_entry *entry = head->next;
1517                        int savectx = sun4c_get_context();
1518
1519                        sun4c_set_context(new_ctx);
1520                        sun4c_flush_context();
1521                        do {
1522                                struct sun4c_mmu_entry *next = entry->next;
1523
1524                                sun4c_user_unmap(entry);
1525                                free_user_entry(new_ctx, entry);
1526
1527                                entry = next;
1528                        } while (entry != head);
1529                        sun4c_set_context(savectx);
1530                }
1531                local_irq_restore(flags);
1532        }
1533}
1534
1535static void sun4c_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end)
1536{
1537        struct mm_struct *mm = vma->vm_mm;
1538        int new_ctx = mm->context;
1539
1540        if (new_ctx != NO_CONTEXT) {
1541                struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
1542                struct sun4c_mmu_entry *entry;
1543                unsigned long flags;
1544
1545                local_irq_save(flags);
1546                /* See commentary in sun4c_flush_cache_range(). */
1547                for (entry = head->next;
1548                     (entry != head) && ((entry->vaddr+SUN4C_REAL_PGDIR_SIZE) < start);
1549                     entry = entry->next)
1550                        ;
1551
1552                if ((entry != head) && (entry->vaddr < end)) {
1553                        int octx = sun4c_get_context();
1554
1555                        sun4c_set_context(new_ctx);
1556                        do {
1557                                struct sun4c_mmu_entry *next = entry->next;
1558
1559                                sun4c_flush_segment(entry->vaddr);
1560                                sun4c_user_unmap(entry);
1561                                free_user_entry(new_ctx, entry);
1562
1563                                entry = next;
1564                        } while ((entry != head) && (entry->vaddr < end));
1565                        sun4c_set_context(octx);
1566                }
1567                local_irq_restore(flags);
1568        }
1569}
1570
1571static void sun4c_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
1572{
1573        struct mm_struct *mm = vma->vm_mm;
1574        int new_ctx = mm->context;
1575
1576        if (new_ctx != NO_CONTEXT) {
1577                int savectx = sun4c_get_context();
1578                unsigned long flags;
1579
1580                local_irq_save(flags);
1581                sun4c_set_context(new_ctx);
1582                page &= PAGE_MASK;
1583                sun4c_flush_page(page);
1584                sun4c_put_pte(page, 0);
1585                sun4c_set_context(savectx);
1586                local_irq_restore(flags);
1587        }
1588}
1589
1590static inline void sun4c_mapioaddr(unsigned long physaddr, unsigned long virt_addr)
1591{
1592        unsigned long page_entry;
1593
1594        page_entry = ((physaddr >> PAGE_SHIFT) & SUN4C_PFN_MASK);
1595        page_entry |= ((pg_iobits | _SUN4C_PAGE_PRIV) & ~(_SUN4C_PAGE_PRESENT));
1596        sun4c_put_pte(virt_addr, page_entry);
1597}
1598
1599static void sun4c_mapiorange(unsigned int bus, unsigned long xpa,
1600    unsigned long xva, unsigned int len)
1601{
1602        while (len != 0) {
1603                len -= PAGE_SIZE;
1604                sun4c_mapioaddr(xpa, xva);
1605                xva += PAGE_SIZE;
1606                xpa += PAGE_SIZE;
1607        }
1608}
1609
1610static void sun4c_unmapiorange(unsigned long virt_addr, unsigned int len)
1611{
1612        while (len != 0) {
1613                len -= PAGE_SIZE;
1614                sun4c_put_pte(virt_addr, 0);
1615                virt_addr += PAGE_SIZE;
1616        }
1617}
1618
1619static void sun4c_alloc_context(struct mm_struct *old_mm, struct mm_struct *mm)
1620{
1621        struct ctx_list *ctxp;
1622
1623        ctxp = ctx_free.next;
1624        if (ctxp != &ctx_free) {
1625                remove_from_ctx_list(ctxp);
1626                add_to_used_ctxlist(ctxp);
1627                mm->context = ctxp->ctx_number;
1628                ctxp->ctx_mm = mm;
1629                return;
1630        }
1631        ctxp = ctx_used.next;
1632        if (ctxp->ctx_mm == old_mm)
1633                ctxp = ctxp->next;
1634        remove_from_ctx_list(ctxp);
1635        add_to_used_ctxlist(ctxp);
1636        ctxp->ctx_mm->context = NO_CONTEXT;
1637        ctxp->ctx_mm = mm;
1638        mm->context = ctxp->ctx_number;
1639        sun4c_demap_context(&sun4c_context_ring[ctxp->ctx_number],
1640                               ctxp->ctx_number);
1641}
1642
1643/* Switch the current MM context. */
1644static void sun4c_switch_mm(struct mm_struct *old_mm, struct mm_struct *mm, struct task_struct *tsk, int cpu)
1645{
1646        struct ctx_list *ctx;
1647        int dirty = 0;
1648
1649        if (mm->context == NO_CONTEXT) {
1650                dirty = 1;
1651                sun4c_alloc_context(old_mm, mm);
1652        } else {
1653                /* Update the LRU ring of contexts. */
1654                ctx = ctx_list_pool + mm->context;
1655                remove_from_ctx_list(ctx);
1656                add_to_used_ctxlist(ctx);
1657        }
1658        if (dirty || old_mm != mm)
1659                sun4c_set_context(mm->context);
1660}
1661
1662static void sun4c_destroy_context(struct mm_struct *mm)
1663{
1664        struct ctx_list *ctx_old;
1665
1666        if (mm->context != NO_CONTEXT) {
1667                sun4c_demap_context(&sun4c_context_ring[mm->context], mm->context);
1668                ctx_old = ctx_list_pool + mm->context;
1669                remove_from_ctx_list(ctx_old);
1670                add_to_free_ctxlist(ctx_old);
1671                mm->context = NO_CONTEXT;
1672        }
1673}
1674
1675static void sun4c_mmu_info(struct seq_file *m)
1676{
1677        int used_user_entries, i;
1678
1679        used_user_entries = 0;
1680        for (i = 0; i < num_contexts; i++)
1681                used_user_entries += sun4c_context_ring[i].num_entries;
1682
1683        seq_printf(m, 
1684                   "vacsize\t\t: %d bytes\n"
1685                   "vachwflush\t: %s\n"
1686                   "vaclinesize\t: %d bytes\n"
1687                   "mmuctxs\t\t: %d\n"
1688                   "mmupsegs\t: %d\n"
1689                   "kernelpsegs\t: %d\n"
1690                   "kfreepsegs\t: %d\n"
1691                   "usedpsegs\t: %d\n"
1692                   "ufreepsegs\t: %d\n"
1693                   "user_taken\t: %d\n"
1694                   "max_taken\t: %d\n",
1695                   sun4c_vacinfo.num_bytes,
1696                   (sun4c_vacinfo.do_hwflushes ? "yes" : "no"),
1697                   sun4c_vacinfo.linesize,
1698                   num_contexts,
1699                   (invalid_segment + 1),
1700                   sun4c_kernel_ring.num_entries,
1701                   sun4c_kfree_ring.num_entries,
1702                   used_user_entries,
1703                   sun4c_ufree_ring.num_entries,
1704                   sun4c_user_taken_entries,
1705                   max_user_taken_entries);
1706}
1707
1708/* Nothing below here should touch the mmu hardware nor the mmu_entry
1709 * data structures.
1710 */
1711
1712/* First the functions which the mid-level code uses to directly
1713 * manipulate the software page tables.  Some defines since we are
1714 * emulating the i386 page directory layout.
1715 */
1716#define PGD_PRESENT  0x001
1717#define PGD_RW       0x002
1718#define PGD_USER     0x004
1719#define PGD_ACCESSED 0x020
1720#define PGD_DIRTY    0x040
1721#define PGD_TABLE    (PGD_PRESENT | PGD_RW | PGD_USER | PGD_ACCESSED | PGD_DIRTY)
1722
1723static void sun4c_set_pte(pte_t *ptep, pte_t pte)
1724{
1725        *ptep = pte;
1726}
1727
1728static void sun4c_pgd_set(pgd_t * pgdp, pmd_t * pmdp)
1729{
1730}
1731
1732static void sun4c_pmd_set(pmd_t * pmdp, pte_t * ptep)
1733{
1734        pmdp->pmdv[0] = PGD_TABLE | (unsigned long) ptep;
1735}
1736
1737static void sun4c_pmd_populate(pmd_t * pmdp, struct page * ptep)
1738{
1739        if (page_address(ptep) == NULL) BUG();  /* No highmem on sun4c */
1740        pmdp->pmdv[0] = PGD_TABLE | (unsigned long) page_address(ptep);
1741}
1742
1743static int sun4c_pte_present(pte_t pte)
1744{
1745        return ((pte_val(pte) & (_SUN4C_PAGE_PRESENT | _SUN4C_PAGE_PRIV)) != 0);
1746}
1747static void sun4c_pte_clear(pte_t *ptep)        { *ptep = __pte(0); }
1748
1749static int sun4c_pmd_bad(pmd_t pmd)
1750{
1751        return (((pmd_val(pmd) & ~PAGE_MASK) != PGD_TABLE) ||
1752                (!virt_addr_valid(pmd_val(pmd))));
1753}
1754
1755static int sun4c_pmd_present(pmd_t pmd)
1756{
1757        return ((pmd_val(pmd) & PGD_PRESENT) != 0);
1758}
1759
1760#if 0 /* if PMD takes one word */
1761static void sun4c_pmd_clear(pmd_t *pmdp)        { *pmdp = __pmd(0); }
1762#else /* if pmd_t is a longish aggregate */
1763static void sun4c_pmd_clear(pmd_t *pmdp) {
1764        memset((void *)pmdp, 0, sizeof(pmd_t));
1765}
1766#endif
1767
1768static int sun4c_pgd_none(pgd_t pgd)            { return 0; }
1769static int sun4c_pgd_bad(pgd_t pgd)             { return 0; }
1770static int sun4c_pgd_present(pgd_t pgd)         { return 1; }
1771static void sun4c_pgd_clear(pgd_t * pgdp)       { }
1772
1773/*
1774 * The following only work if pte_present() is true.
1775 * Undefined behaviour if not..
1776 */
1777static pte_t sun4c_pte_mkwrite(pte_t pte)
1778{
1779        pte = __pte(pte_val(pte) | _SUN4C_PAGE_WRITE);
1780        if (pte_val(pte) & _SUN4C_PAGE_MODIFIED)
1781                pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_WRITE);
1782        return pte;
1783}
1784
1785static pte_t sun4c_pte_mkdirty(pte_t pte)
1786{
1787        pte = __pte(pte_val(pte) | _SUN4C_PAGE_MODIFIED);
1788        if (pte_val(pte) & _SUN4C_PAGE_WRITE)
1789                pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_WRITE);
1790        return pte;
1791}
1792
1793static pte_t sun4c_pte_mkyoung(pte_t pte)
1794{
1795        pte = __pte(pte_val(pte) | _SUN4C_PAGE_ACCESSED);
1796        if (pte_val(pte) & _SUN4C_PAGE_READ)
1797                pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_READ);
1798        return pte;
1799}
1800
1801/*
1802 * Conversion functions: convert a page and protection to a page entry,
1803 * and a page entry and page directory to the page they refer to.
1804 */
1805static pte_t sun4c_mk_pte(struct page *page, pgprot_t pgprot)
1806{
1807        return __pte(page_to_pfn(page) | pgprot_val(pgprot));
1808}
1809
1810static pte_t sun4c_mk_pte_phys(unsigned long phys_page, pgprot_t pgprot)
1811{
1812        return __pte((phys_page >> PAGE_SHIFT) | pgprot_val(pgprot));
1813}
1814
1815static pte_t sun4c_mk_pte_io(unsigned long page, pgprot_t pgprot, int space)
1816{
1817        return __pte(((page - PAGE_OFFSET) >> PAGE_SHIFT) | pgprot_val(pgprot));
1818}
1819
1820static unsigned long sun4c_pte_pfn(pte_t pte)
1821{
1822        return pte_val(pte) & SUN4C_PFN_MASK;
1823}
1824
1825static pte_t sun4c_pgoff_to_pte(unsigned long pgoff)
1826{
1827        return __pte(pgoff | _SUN4C_PAGE_FILE);
1828}
1829
1830static unsigned long sun4c_pte_to_pgoff(pte_t pte)
1831{
1832        return pte_val(pte) & ((1UL << PTE_FILE_MAX_BITS) - 1);
1833}
1834
1835
1836static __inline__ unsigned long sun4c_pmd_page_v(pmd_t pmd)
1837{
1838        return (pmd_val(pmd) & PAGE_MASK);
1839}
1840
1841static struct page *sun4c_pmd_page(pmd_t pmd)
1842{
1843        return virt_to_page(sun4c_pmd_page_v(pmd));
1844}
1845
1846static unsigned long sun4c_pgd_page(pgd_t pgd) { return 0; }
1847
1848/* to find an entry in a page-table-directory */
1849static inline pgd_t *sun4c_pgd_offset(struct mm_struct * mm, unsigned long address)
1850{
1851        return mm->pgd + (address >> SUN4C_PGDIR_SHIFT);
1852}
1853
1854/* Find an entry in the second-level page table.. */
1855static pmd_t *sun4c_pmd_offset(pgd_t * dir, unsigned long address)
1856{
1857        return (pmd_t *) dir;
1858}
1859
1860/* Find an entry in the third-level page table.. */ 
1861pte_t *sun4c_pte_offset_kernel(pmd_t * dir, unsigned long address)
1862{
1863        return (pte_t *) sun4c_pmd_page_v(*dir) +
1864                        ((address >> PAGE_SHIFT) & (SUN4C_PTRS_PER_PTE - 1));
1865}
1866
1867static unsigned long sun4c_swp_type(swp_entry_t entry)
1868{
1869        return (entry.val & SUN4C_SWP_TYPE_MASK);
1870}
1871
1872static unsigned long sun4c_swp_offset(swp_entry_t entry)
1873{
1874        return (entry.val >> SUN4C_SWP_OFF_SHIFT) & SUN4C_SWP_OFF_MASK;
1875}
1876
1877static swp_entry_t sun4c_swp_entry(unsigned long type, unsigned long offset)
1878{
1879        return (swp_entry_t) {
1880                  (offset & SUN4C_SWP_OFF_MASK) << SUN4C_SWP_OFF_SHIFT
1881                | (type & SUN4C_SWP_TYPE_MASK) };
1882}
1883
1884static void sun4c_free_pte_slow(pte_t *pte)
1885{
1886        free_page((unsigned long)pte);
1887}
1888
1889static void sun4c_free_pgd_slow(pgd_t *pgd)
1890{
1891        free_page((unsigned long)pgd);
1892}
1893
1894static pgd_t *sun4c_get_pgd_fast(void)
1895{
1896        unsigned long *ret;
1897
1898        if ((ret = pgd_quicklist) != NULL) {
1899                pgd_quicklist = (unsigned long *)(*ret);
1900                ret[0] = ret[1];
1901                pgtable_cache_size--;
1902        } else {
1903                pgd_t *init;
1904                
1905                ret = (unsigned long *)__get_free_page(GFP_KERNEL);
1906                memset (ret, 0, (KERNBASE / SUN4C_PGDIR_SIZE) * sizeof(pgd_t));
1907                init = sun4c_pgd_offset(&init_mm, 0);
1908                memcpy (((pgd_t *)ret) + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
1909                        (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
1910        }
1911        return (pgd_t *)ret;
1912}
1913
1914static void sun4c_free_pgd_fast(pgd_t *pgd)
1915{
1916        *(unsigned long *)pgd = (unsigned long) pgd_quicklist;
1917        pgd_quicklist = (unsigned long *) pgd;
1918        pgtable_cache_size++;
1919}
1920
1921
1922static __inline__ pte_t *
1923sun4c_pte_alloc_one_fast(struct mm_struct *mm, unsigned long address)
1924{
1925        unsigned long *ret;
1926
1927        if ((ret = (unsigned long *)pte_quicklist) != NULL) {
1928                pte_quicklist = (unsigned long *)(*ret);
1929                ret[0] = ret[1];
1930                pgtable_cache_size--;
1931        }
1932        return (pte_t *)ret;
1933}
1934
1935static pte_t *sun4c_pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
1936{
1937        pte_t *pte;
1938
1939        if ((pte = sun4c_pte_alloc_one_fast(mm, address)) != NULL)
1940                return pte;
1941
1942        pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
1943        if (pte)
1944                memset(pte, 0, PAGE_SIZE);
1945        return pte;
1946}
1947
1948static struct page *sun4c_pte_alloc_one(struct mm_struct *mm, unsigned long address)
1949{
1950        pte_t *pte = sun4c_pte_alloc_one_kernel(mm, address);
1951        if (pte == NULL)
1952                return NULL;
1953        return virt_to_page(pte);
1954}
1955
1956static __inline__ void sun4c_free_pte_fast(pte_t *pte)
1957{
1958        *(unsigned long *)pte = (unsigned long) pte_quicklist;
1959        pte_quicklist = (unsigned long *) pte;
1960        pgtable_cache_size++;
1961}
1962
1963static void sun4c_pte_free(struct page *pte)
1964{
1965        sun4c_free_pte_fast(page_address(pte));
1966}
1967
1968/*
1969 * allocating and freeing a pmd is trivial: the 1-entry pmd is
1970 * inside the pgd, so has no extra memory associated with it.
1971 */
1972static pmd_t *sun4c_pmd_alloc_one(struct mm_struct *mm, unsigned long address)
1973{
1974        BUG();
1975        return NULL;
1976}
1977
1978static void sun4c_free_pmd_fast(pmd_t * pmd) { }
1979
1980static void sun4c_check_pgt_cache(int low, int high)
1981{
1982        if (pgtable_cache_size > high) {
1983                do {
1984                        if (pgd_quicklist)
1985                                sun4c_free_pgd_slow(sun4c_get_pgd_fast());
1986                        if (pte_quicklist)
1987                                sun4c_free_pte_slow(sun4c_pte_alloc_one_fast(NULL, 0));
1988                } while (pgtable_cache_size > low);
1989        }
1990}
1991
1992/* An experiment, turn off by default for now... -DaveM */
1993#define SUN4C_PRELOAD_PSEG
1994
1995void sun4c_update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t pte)
1996{
1997        unsigned long flags;
1998        int pseg;
1999
2000        local_irq_save(flags);
2001        address &= PAGE_MASK;
2002        if ((pseg = sun4c_get_segmap(address)) == invalid_segment) {
2003                struct sun4c_mmu_entry *entry = sun4c_user_strategy();
2004                struct mm_struct *mm = vma->vm_mm;
2005                unsigned long start, end;
2006
2007                entry->vaddr = start = (address & SUN4C_REAL_PGDIR_MASK);
2008                entry->ctx = mm->context;
2009                add_ring_ordered(sun4c_context_ring + mm->context, entry);
2010                sun4c_put_segmap(entry->vaddr, entry->pseg);
2011                end = start + SUN4C_REAL_PGDIR_SIZE;
2012                while (start < end) {
2013#ifdef SUN4C_PRELOAD_PSEG
2014                        pgd_t *pgdp = sun4c_pgd_offset(mm, start);
2015                        pte_t *ptep;
2016
2017                        if (!pgdp)
2018                                goto no_mapping;
2019                        ptep = sun4c_pte_offset_kernel((pmd_t *) pgdp, start);
2020                        if (!ptep || !(pte_val(*ptep) & _SUN4C_PAGE_PRESENT))
2021                                goto no_mapping;
2022                        sun4c_put_pte(start, pte_val(*ptep));
2023                        goto next;
2024
2025                no_mapping:
2026#endif
2027                        sun4c_put_pte(start, 0);
2028#ifdef SUN4C_PRELOAD_PSEG
2029                next:
2030#endif
2031                        start += PAGE_SIZE;
2032                }
2033#ifndef SUN4C_PRELOAD_PSEG
2034                sun4c_put_pte(address, pte_val(pte));
2035#endif
2036                local_irq_restore(flags);
2037                return;
2038        } else {
2039                struct sun4c_mmu_entry *entry = &mmu_entry_pool[pseg];
2040
2041                remove_lru(entry);
2042                add_lru(entry);
2043        }
2044
2045        sun4c_put_pte(address, pte_val(pte));
2046        local_irq_restore(flags);
2047}
2048
2049extern void sparc_context_init(int);
2050extern unsigned long end;
2051extern unsigned long bootmem_init(unsigned long *pages_avail);
2052extern unsigned long last_valid_pfn;
2053
2054void __init sun4c_paging_init(void)
2055{
2056        int i, cnt;
2057        unsigned long kernel_end, vaddr;
2058        extern struct resource sparc_iomap;
2059        unsigned long end_pfn, pages_avail;
2060
2061        kernel_end = (unsigned long) &end;
2062        kernel_end += (SUN4C_REAL_PGDIR_SIZE * 4);
2063        kernel_end = SUN4C_REAL_PGDIR_ALIGN(kernel_end);
2064
2065        pages_avail = 0;
2066        last_valid_pfn = bootmem_init(&pages_avail);
2067        end_pfn = last_valid_pfn;
2068
2069        sun4c_probe_mmu();
2070        invalid_segment = (num_segmaps - 1);
2071        sun4c_init_mmu_entry_pool();
2072        sun4c_init_rings();
2073        sun4c_init_map_kernelprom(kernel_end);
2074        sun4c_init_clean_mmu(kernel_end);
2075        sun4c_init_fill_kernel_ring(SUN4C_KERNEL_BUCKETS);
2076        sun4c_init_lock_area(sparc_iomap.start, IOBASE_END);
2077        sun4c_init_lock_area(DVMA_VADDR, DVMA_END);
2078        sun4c_init_lock_areas();
2079        sun4c_init_fill_user_ring();
2080
2081        sun4c_set_context(0);
2082        memset(swapper_pg_dir, 0, PAGE_SIZE);
2083        memset(pg0, 0, PAGE_SIZE);
2084        memset(pg1, 0, PAGE_SIZE);
2085        memset(pg2, 0, PAGE_SIZE);
2086        memset(pg3, 0, PAGE_SIZE);
2087
2088        /* Save work later. */
2089        vaddr = VMALLOC_START;
2090        swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg0);
2091        vaddr += SUN4C_PGDIR_SIZE;
2092        swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg1);
2093        vaddr += SUN4C_PGDIR_SIZE;
2094        swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg2);
2095        vaddr += SUN4C_PGDIR_SIZE;
2096        swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg3);
2097        sun4c_init_ss2_cache_bug();
2098        sparc_context_init(num_contexts);
2099
2100        {
2101                unsigned long zones_size[MAX_NR_ZONES];
2102                unsigned long zholes_size[MAX_NR_ZONES];
2103                unsigned long npages;
2104                int znum;
2105
2106                for (znum = 0; znum < MAX_NR_ZONES; znum++)
2107                        zones_size[znum] = zholes_size[znum] = 0;
2108
2109                npages = max_low_pfn - pfn_base;
2110
2111                zones_size[ZONE_DMA] = npages;
2112                zholes_size[ZONE_DMA] = npages - pages_avail;
2113
2114                npages = highend_pfn - max_low_pfn;
2115                zones_size[ZONE_HIGHMEM] = npages;
2116                zholes_size[ZONE_HIGHMEM] = npages - calc_highpages();
2117
2118                free_area_init_node(0, &contig_page_data, zones_size,
2119                                    pfn_base, zholes_size);
2120                mem_map = contig_page_data.node_mem_map;
2121        }
2122
2123        cnt = 0;
2124        for (i = 0; i < num_segmaps; i++)
2125                if (mmu_entry_pool[i].locked)
2126                        cnt++;
2127
2128        max_user_taken_entries = num_segmaps - cnt - 40 - 1;
2129
2130        printk("SUN4C: %d mmu entries for the kernel\n", cnt);
2131}
2132
2133/* Load up routines and constants for sun4c mmu */
2134void __init ld_mmu_sun4c(void)
2135{
2136        extern void ___xchg32_sun4c(void);
2137        
2138        printk("Loading sun4c MMU routines\n");
2139
2140        /* First the constants */
2141        BTFIXUPSET_SIMM13(pgdir_shift, SUN4C_PGDIR_SHIFT);
2142        BTFIXUPSET_SETHI(pgdir_size, SUN4C_PGDIR_SIZE);
2143        BTFIXUPSET_SETHI(pgdir_mask, SUN4C_PGDIR_MASK);
2144
2145        BTFIXUPSET_SIMM13(ptrs_per_pmd, SUN4C_PTRS_PER_PMD);
2146        BTFIXUPSET_SIMM13(ptrs_per_pgd, SUN4C_PTRS_PER_PGD);
2147        BTFIXUPSET_SIMM13(user_ptrs_per_pgd, KERNBASE / SUN4C_PGDIR_SIZE);
2148
2149        BTFIXUPSET_INT(page_none, pgprot_val(SUN4C_PAGE_NONE));
2150        BTFIXUPSET_INT(page_shared, pgprot_val(SUN4C_PAGE_SHARED));
2151        BTFIXUPSET_INT(page_copy, pgprot_val(SUN4C_PAGE_COPY));
2152        BTFIXUPSET_INT(page_readonly, pgprot_val(SUN4C_PAGE_READONLY));
2153        BTFIXUPSET_INT(page_kernel, pgprot_val(SUN4C_PAGE_KERNEL));
2154        page_kernel = pgprot_val(SUN4C_PAGE_KERNEL);
2155        pg_iobits = _SUN4C_PAGE_PRESENT | _SUN4C_READABLE | _SUN4C_WRITEABLE |
2156                    _SUN4C_PAGE_IO | _SUN4C_PAGE_NOCACHE;
2157
2158        /* Functions */
2159        BTFIXUPSET_CALL(___xchg32, ___xchg32_sun4c, BTFIXUPCALL_NORM);
2160        BTFIXUPSET_CALL(do_check_pgt_cache, sun4c_check_pgt_cache, BTFIXUPCALL_NORM);
2161        
2162        BTFIXUPSET_CALL(flush_cache_all, sun4c_flush_cache_all, BTFIXUPCALL_NORM);
2163
2164        if (sun4c_vacinfo.do_hwflushes) {
2165                BTFIXUPSET_CALL(sun4c_flush_page, sun4c_flush_page_hw, BTFIXUPCALL_NORM);
2166                BTFIXUPSET_CALL(sun4c_flush_segment, sun4c_flush_segment_hw, BTFIXUPCALL_NORM);
2167                BTFIXUPSET_CALL(sun4c_flush_context, sun4c_flush_context_hw, BTFIXUPCALL_NORM);
2168        } else {
2169                BTFIXUPSET_CALL(sun4c_flush_page, sun4c_flush_page_sw, BTFIXUPCALL_NORM);
2170                BTFIXUPSET_CALL(sun4c_flush_segment, sun4c_flush_segment_sw, BTFIXUPCALL_NORM);
2171                BTFIXUPSET_CALL(sun4c_flush_context, sun4c_flush_context_sw, BTFIXUPCALL_NORM);
2172        }
2173
2174        BTFIXUPSET_CALL(flush_tlb_mm, sun4c_flush_tlb_mm, BTFIXUPCALL_NORM);
2175        BTFIXUPSET_CALL(flush_cache_mm, sun4c_flush_cache_mm, BTFIXUPCALL_NORM);
2176        BTFIXUPSET_CALL(destroy_context, sun4c_destroy_context, BTFIXUPCALL_NORM);
2177        BTFIXUPSET_CALL(switch_mm, sun4c_switch_mm, BTFIXUPCALL_NORM);
2178        BTFIXUPSET_CALL(flush_cache_page, sun4c_flush_cache_page, BTFIXUPCALL_NORM);
2179        BTFIXUPSET_CALL(flush_tlb_page, sun4c_flush_tlb_page, BTFIXUPCALL_NORM);
2180        BTFIXUPSET_CALL(flush_tlb_range, sun4c_flush_tlb_range, BTFIXUPCALL_NORM);
2181        BTFIXUPSET_CALL(flush_cache_range, sun4c_flush_cache_range, BTFIXUPCALL_NORM);
2182        BTFIXUPSET_CALL(__flush_page_to_ram, sun4c_flush_page_to_ram, BTFIXUPCALL_NORM);
2183        BTFIXUPSET_CALL(flush_tlb_all, sun4c_flush_tlb_all, BTFIXUPCALL_NORM);
2184
2185        BTFIXUPSET_CALL(flush_sig_insns, sun4c_flush_sig_insns, BTFIXUPCALL_NOP);
2186
2187        BTFIXUPSET_CALL(set_pte, sun4c_set_pte, BTFIXUPCALL_STO1O0);
2188
2189        /* The 2.4.18 code does not set this on sun4c, how does it work? XXX */
2190        /* BTFIXUPSET_SETHI(none_mask, 0x00000000); */  /* Defaults to zero? */
2191
2192        BTFIXUPSET_CALL(pte_pfn, sun4c_pte_pfn, BTFIXUPCALL_NORM);
2193#if 0 /* PAGE_SHIFT <= 12 */ /* Eek. Investigate. XXX */
2194        BTFIXUPSET_CALL(pmd_page, sun4c_pmd_page, BTFIXUPCALL_ANDNINT(PAGE_SIZE - 1));
2195#else
2196        BTFIXUPSET_CALL(pmd_page, sun4c_pmd_page, BTFIXUPCALL_NORM);
2197#endif
2198        BTFIXUPSET_CALL(pmd_set, sun4c_pmd_set, BTFIXUPCALL_NORM);
2199        BTFIXUPSET_CALL(pmd_populate, sun4c_pmd_populate, BTFIXUPCALL_NORM);
2200
2201        BTFIXUPSET_CALL(pte_present, sun4c_pte_present, BTFIXUPCALL_NORM);
2202        BTFIXUPSET_CALL(pte_clear, sun4c_pte_clear, BTFIXUPCALL_STG0O0);
2203
2204        BTFIXUPSET_CALL(pmd_bad, sun4c_pmd_bad, BTFIXUPCALL_NORM);
2205        BTFIXUPSET_CALL(pmd_present, sun4c_pmd_present, BTFIXUPCALL_NORM);
2206        BTFIXUPSET_CALL(pmd_clear, sun4c_pmd_clear, BTFIXUPCALL_STG0O0);
2207
2208        BTFIXUPSET_CALL(pgd_none, sun4c_pgd_none, BTFIXUPCALL_RETINT(0));
2209        BTFIXUPSET_CALL(pgd_bad, sun4c_pgd_bad, BTFIXUPCALL_RETINT(0));
2210        BTFIXUPSET_CALL(pgd_present, sun4c_pgd_present, BTFIXUPCALL_RETINT(1));
2211        BTFIXUPSET_CALL(pgd_clear, sun4c_pgd_clear, BTFIXUPCALL_NOP);
2212
2213        BTFIXUPSET_CALL(mk_pte, sun4c_mk_pte, BTFIXUPCALL_NORM);
2214        BTFIXUPSET_CALL(mk_pte_phys, sun4c_mk_pte_phys, BTFIXUPCALL_NORM);
2215        BTFIXUPSET_CALL(mk_pte_io, sun4c_mk_pte_io, BTFIXUPCALL_NORM);
2216
2217        BTFIXUPSET_INT(pte_modify_mask, _SUN4C_PAGE_CHG_MASK);
2218        BTFIXUPSET_CALL(pmd_offset, sun4c_pmd_offset, BTFIXUPCALL_NORM);
2219        BTFIXUPSET_CALL(pte_offset_kernel, sun4c_pte_offset_kernel, BTFIXUPCALL_NORM);
2220        BTFIXUPSET_CALL(free_pte_fast, sun4c_free_pte_fast, BTFIXUPCALL_NORM);
2221        BTFIXUPSET_CALL(pte_free, sun4c_pte_free, BTFIXUPCALL_NORM);
2222        BTFIXUPSET_CALL(pte_alloc_one_kernel, sun4c_pte_alloc_one_kernel, BTFIXUPCALL_NORM);
2223        BTFIXUPSET_CALL(pte_alloc_one, sun4c_pte_alloc_one, BTFIXUPCALL_NORM);
2224        BTFIXUPSET_CALL(free_pmd_fast, sun4c_free_pmd_fast, BTFIXUPCALL_NOP);
2225        BTFIXUPSET_CALL(pmd_alloc_one, sun4c_pmd_alloc_one, BTFIXUPCALL_RETO0);
2226        BTFIXUPSET_CALL(free_pgd_fast, sun4c_free_pgd_fast, BTFIXUPCALL_NORM);
2227        BTFIXUPSET_CALL(get_pgd_fast, sun4c_get_pgd_fast, BTFIXUPCALL_NORM);
2228
2229        BTFIXUPSET_HALF(pte_readi, _SUN4C_PAGE_READ);
2230        BTFIXUPSET_HALF(pte_writei, _SUN4C_PAGE_WRITE);
2231        BTFIXUPSET_HALF(pte_dirtyi, _SUN4C_PAGE_MODIFIED);
2232        BTFIXUPSET_HALF(pte_youngi, _SUN4C_PAGE_ACCESSED);
2233        BTFIXUPSET_HALF(pte_filei, _SUN4C_PAGE_FILE);
2234        BTFIXUPSET_HALF(pte_wrprotecti, _SUN4C_PAGE_WRITE|_SUN4C_PAGE_SILENT_WRITE);
2235        BTFIXUPSET_HALF(pte_mkcleani, _SUN4C_PAGE_MODIFIED|_SUN4C_PAGE_SILENT_WRITE);
2236        BTFIXUPSET_HALF(pte_mkoldi, _SUN4C_PAGE_ACCESSED|_SUN4C_PAGE_SILENT_READ);
2237        BTFIXUPSET_CALL(pte_mkwrite, sun4c_pte_mkwrite, BTFIXUPCALL_NORM);
2238        BTFIXUPSET_CALL(pte_mkdirty, sun4c_pte_mkdirty, BTFIXUPCALL_NORM);
2239        BTFIXUPSET_CALL(pte_mkyoung, sun4c_pte_mkyoung, BTFIXUPCALL_NORM);
2240        BTFIXUPSET_CALL(update_mmu_cache, sun4c_update_mmu_cache, BTFIXUPCALL_NORM);
2241
2242        BTFIXUPSET_CALL(pte_to_pgoff, sun4c_pte_to_pgoff, BTFIXUPCALL_NORM);
2243        BTFIXUPSET_CALL(pgoff_to_pte, sun4c_pgoff_to_pte, BTFIXUPCALL_NORM);
2244
2245        BTFIXUPSET_CALL(mmu_lockarea, sun4c_lockarea, BTFIXUPCALL_NORM);
2246        BTFIXUPSET_CALL(mmu_unlockarea, sun4c_unlockarea, BTFIXUPCALL_NORM);
2247
2248        BTFIXUPSET_CALL(mmu_get_scsi_one, sun4c_get_scsi_one, BTFIXUPCALL_NORM);
2249        BTFIXUPSET_CALL(mmu_get_scsi_sgl, sun4c_get_scsi_sgl, BTFIXUPCALL_NORM);
2250        BTFIXUPSET_CALL(mmu_release_scsi_one, sun4c_release_scsi_one, BTFIXUPCALL_NORM);
2251        BTFIXUPSET_CALL(mmu_release_scsi_sgl, sun4c_release_scsi_sgl, BTFIXUPCALL_NORM);
2252
2253        BTFIXUPSET_CALL(mmu_map_dma_area, sun4c_map_dma_area, BTFIXUPCALL_NORM);
2254        BTFIXUPSET_CALL(mmu_unmap_dma_area, sun4c_unmap_dma_area, BTFIXUPCALL_NORM);
2255        BTFIXUPSET_CALL(mmu_translate_dvma, sun4c_translate_dvma, BTFIXUPCALL_NORM);
2256
2257        BTFIXUPSET_CALL(sparc_mapiorange, sun4c_mapiorange, BTFIXUPCALL_NORM);
2258        BTFIXUPSET_CALL(sparc_unmapiorange, sun4c_unmapiorange, BTFIXUPCALL_NORM);
2259
2260        BTFIXUPSET_CALL(__swp_type, sun4c_swp_type, BTFIXUPCALL_NORM);
2261        BTFIXUPSET_CALL(__swp_offset, sun4c_swp_offset, BTFIXUPCALL_NORM);
2262        BTFIXUPSET_CALL(__swp_entry, sun4c_swp_entry, BTFIXUPCALL_NORM);
2263
2264        BTFIXUPSET_CALL(alloc_thread_info, sun4c_alloc_thread_info, BTFIXUPCALL_NORM);
2265        BTFIXUPSET_CALL(free_thread_info, sun4c_free_thread_info, BTFIXUPCALL_NORM);
2266
2267        BTFIXUPSET_CALL(mmu_info, sun4c_mmu_info, BTFIXUPCALL_NORM);
2268
2269        /* These should _never_ get called with two level tables. */
2270        BTFIXUPSET_CALL(pgd_set, sun4c_pgd_set, BTFIXUPCALL_NOP);
2271        BTFIXUPSET_CALL(pgd_page, sun4c_pgd_page, BTFIXUPCALL_RETO0);
2272}
2273
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