LXR linux/arch/parisc/include/asm/processor.h

   1/*
   2 * include/asm-parisc/processor.h
   3 *
   4 * Copyright (C) 1994 Linus Torvalds
   5 * Copyright (C) 2001 Grant Grundler
   6 */
   7
   8#ifndef __ASM_PARISC_PROCESSOR_H
   9#define __ASM_PARISC_PROCESSOR_H
  10
  11#ifndef __ASSEMBLY__
  12#include <linux/threads.h>
  13
  14#include <asm/prefetch.h>
  15#include <asm/hardware.h>
  16#include <asm/pdc.h>
  17#include <asm/ptrace.h>
  18#include <asm/types.h>
  19#include <asm/system.h>
  20#include <asm/percpu.h>
  21#endif /* __ASSEMBLY__ */
  22
  23#define KERNEL_STACK_SIZE       (4*PAGE_SIZE)
  24
  25/*
  26 * Default implementation of macro that returns current
  27 * instruction pointer ("program counter").
  28 */
  29#ifdef CONFIG_PA20
  30#define current_ia(x)   __asm__("mfia %0" : "=r"(x))
  31#else /* mfia added in pa2.0 */
  32#define current_ia(x)   __asm__("blr 0,%0\n\tnop" : "=r"(x))
  33#endif
  34#define current_text_addr() ({ void *pc; current_ia(pc); pc; })
  35
  36#define TASK_SIZE_OF(tsk)       ((tsk)->thread.task_size)
  37#define TASK_SIZE               TASK_SIZE_OF(current)
  38#define TASK_UNMAPPED_BASE      (current->thread.map_base)
  39
  40#define DEFAULT_TASK_SIZE32     (0xFFF00000UL)
  41#define DEFAULT_MAP_BASE32      (0x40000000UL)
  42
  43#ifdef CONFIG_64BIT
  44#define DEFAULT_TASK_SIZE       (MAX_ADDRESS-0xf000000)
  45#define DEFAULT_MAP_BASE        (0x200000000UL)
  46#else
  47#define DEFAULT_TASK_SIZE       DEFAULT_TASK_SIZE32
  48#define DEFAULT_MAP_BASE        DEFAULT_MAP_BASE32
  49#endif
  50
  51#ifdef __KERNEL__
  52
  53/* XXX: STACK_TOP actually should be STACK_BOTTOM for parisc.
  54 * prumpf */
  55
  56#define STACK_TOP       TASK_SIZE
  57#define STACK_TOP_MAX   DEFAULT_TASK_SIZE
  58
  59#endif
  60
  61#ifndef __ASSEMBLY__
  62
  63/*
  64 * Data detected about CPUs at boot time which is the same for all CPU's.
  65 * HP boxes are SMP - ie identical processors.
  66 *
  67 * FIXME: some CPU rev info may be processor specific...
  68 */
  69struct system_cpuinfo_parisc {
  70        unsigned int    cpu_count;
  71        unsigned int    cpu_hz;
  72        unsigned int    hversion;
  73        unsigned int    sversion;
  74        enum cpu_type   cpu_type;
  75
  76        struct {
  77                struct pdc_model model;
  78                unsigned long versions;
  79                unsigned long cpuid;
  80                unsigned long capabilities;
  81                char   sys_model_name[81]; /* PDC-ROM returnes this model name */
  82        } pdc;
  83
  84        const char      *cpu_name;      /* e.g. "PA7300LC (PCX-L2)" */
  85        const char      *family_name;   /* e.g. "1.1e" */
  86};
  87
  88
  89/* Per CPU data structure - ie varies per CPU.  */
  90struct cpuinfo_parisc {
  91        unsigned long it_value;     /* Interval Timer at last timer Intr */
  92        unsigned long it_delta;     /* Interval delta (tic_10ms / HZ * 100) */
  93        unsigned long irq_count;    /* number of IRQ's since boot */
  94        unsigned long irq_max_cr16; /* longest time to handle a single IRQ */
  95        unsigned long cpuid;        /* aka slot_number or set to NO_PROC_ID */
  96        unsigned long hpa;          /* Host Physical address */
  97        unsigned long txn_addr;     /* MMIO addr of EIR or id_eid */
  98#ifdef CONFIG_SMP
  99        unsigned long pending_ipi;  /* bitmap of type ipi_message_type */
 100        unsigned long ipi_count;    /* number ipi Interrupts */
 101#endif
 102        unsigned long bh_count;     /* number of times bh was invoked */
 103        unsigned long prof_counter; /* per CPU profiling support */
 104        unsigned long prof_multiplier;  /* per CPU profiling support */
 105        unsigned long fp_rev;
 106        unsigned long fp_model;
 107        unsigned int state;
 108        struct parisc_device *dev;
 109        unsigned long loops_per_jiffy;
 110};
 111
 112extern struct system_cpuinfo_parisc boot_cpu_data;
 113DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data);
 114
 115#define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)
 116
 117typedef struct {
 118        int seg;  
 119} mm_segment_t;
 120
 121#define ARCH_MIN_TASKALIGN      8
 122
 123struct thread_struct {
 124        struct pt_regs regs;
 125        unsigned long  task_size;
 126        unsigned long  map_base;
 127        unsigned long  flags;
 128}; 
 129
 130/* Thread struct flags. */
 131#define PARISC_UAC_NOPRINT      (1UL << 0)      /* see prctl and unaligned.c */
 132#define PARISC_UAC_SIGBUS       (1UL << 1)
 133#define PARISC_KERNEL_DEATH     (1UL << 31)     /* see die_if_kernel()... */
 134
 135#define PARISC_UAC_SHIFT        0
 136#define PARISC_UAC_MASK         (PARISC_UAC_NOPRINT|PARISC_UAC_SIGBUS)
 137
 138#define SET_UNALIGN_CTL(task,value)                                       \
 139        ({                                                                \
 140        (task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \
 141                                | (((value) << PARISC_UAC_SHIFT) &        \
 142                                   PARISC_UAC_MASK));                     \
 143        0;                                                                \
 144        })
 145
 146#define GET_UNALIGN_CTL(task,addr)                                        \
 147        ({                                                                \
 148        put_user(((task)->thread.flags & PARISC_UAC_MASK)                 \
 149                 >> PARISC_UAC_SHIFT, (int __user *) (addr));             \
 150        })
 151
 152#define INIT_THREAD { \
 153        .regs = {       .gr     = { 0, }, \
 154                        .fr     = { 0, }, \
 155                        .sr     = { 0, }, \
 156                        .iasq   = { 0, }, \
 157                        .iaoq   = { 0, }, \
 158                        .cr27   = 0, \
 159                }, \
 160        .task_size      = DEFAULT_TASK_SIZE, \
 161        .map_base       = DEFAULT_MAP_BASE, \
 162        .flags          = 0 \
 163        }
 164
 165/*
 166 * Return saved PC of a blocked thread.  This is used by ps mostly.
 167 */
 168
 169unsigned long thread_saved_pc(struct task_struct *t);
 170void show_trace(struct task_struct *task, unsigned long *stack);
 171
 172/*
 173 * Start user thread in another space.
 174 *
 175 * Note that we set both the iaoq and r31 to the new pc. When
 176 * the kernel initially calls execve it will return through an
 177 * rfi path that will use the values in the iaoq. The execve
 178 * syscall path will return through the gateway page, and
 179 * that uses r31 to branch to.
 180 *
 181 * For ELF we clear r23, because the dynamic linker uses it to pass
 182 * the address of the finalizer function.
 183 *
 184 * We also initialize sr3 to an illegal value (illegal for our
 185 * implementation, not for the architecture).
 186 */
 187typedef unsigned int elf_caddr_t;
 188
 189#define start_thread_som(regs, new_pc, new_sp) do {     \
 190        unsigned long *sp = (unsigned long *)new_sp;    \
 191        __u32 spaceid = (__u32)current->mm->context;    \
 192        unsigned long pc = (unsigned long)new_pc;       \
 193        /* offset pc for priv. level */                 \
 194        pc |= 3;                                        \
 195                                                        \
 196        set_fs(USER_DS);                                \
 197        regs->iasq[0] = spaceid;                        \
 198        regs->iasq[1] = spaceid;                        \
 199        regs->iaoq[0] = pc;                             \
 200        regs->iaoq[1] = pc + 4;                         \
 201        regs->sr[2] = LINUX_GATEWAY_SPACE;              \
 202        regs->sr[3] = 0xffff;                           \
 203        regs->sr[4] = spaceid;                          \
 204        regs->sr[5] = spaceid;                          \
 205        regs->sr[6] = spaceid;                          \
 206        regs->sr[7] = spaceid;                          \
 207        regs->gr[ 0] = USER_PSW;                        \
 208        regs->gr[30] = ((new_sp)+63)&~63;               \
 209        regs->gr[31] = pc;                              \
 210                                                        \
 211        get_user(regs->gr[26],&sp[0]);                  \
 212        get_user(regs->gr[25],&sp[-1]);                 \
 213        get_user(regs->gr[24],&sp[-2]);                 \
 214        get_user(regs->gr[23],&sp[-3]);                 \
 215} while(0)
 216
 217/* The ELF abi wants things done a "wee bit" differently than
 218 * som does.  Supporting this behavior here avoids
 219 * having our own version of create_elf_tables.
 220 *
 221 * Oh, and yes, that is not a typo, we are really passing argc in r25
 222 * and argv in r24 (rather than r26 and r25).  This is because that's
 223 * where __libc_start_main wants them.
 224 *
 225 * Duplicated from dl-machine.h for the benefit of readers:
 226 *
 227 *  Our initial stack layout is rather different from everyone else's
 228 *  due to the unique PA-RISC ABI.  As far as I know it looks like
 229 *  this:
 230
 231   -----------------------------------  (user startup code creates this frame)
 232   |         32 bytes of magic       |
 233   |---------------------------------|
 234   | 32 bytes argument/sp save area  |
 235   |---------------------------------| (bprm->p)
 236   |        ELF auxiliary info       |
 237   |         (up to 28 words)        |
 238   |---------------------------------|
 239   |               NULL              |
 240   |---------------------------------|
 241   |       Environment pointers      |
 242   |---------------------------------|
 243   |               NULL              |
 244   |---------------------------------|
 245   |        Argument pointers        |
 246   |---------------------------------| <- argv
 247   |          argc (1 word)          |
 248   |---------------------------------| <- bprm->exec (HACK!)
 249   |         N bytes of slack        |
 250   |---------------------------------|
 251   |    filename passed to execve    |
 252   |---------------------------------| (mm->env_end)
 253   |           env strings           |
 254   |---------------------------------| (mm->env_start, mm->arg_end)
 255   |           arg strings           |
 256   |---------------------------------|
 257   | additional faked arg strings if |
 258   | we're invoked via binfmt_script |
 259   |---------------------------------| (mm->arg_start)
 260   stack base is at TASK_SIZE - rlim_max.
 261
 262on downward growing arches, it looks like this:
 263   stack base at TASK_SIZE
 264   | filename passed to execve
 265   | env strings
 266   | arg strings
 267   | faked arg strings
 268   | slack
 269   | ELF
 270   | envps
 271   | argvs
 272   | argc
 273
 274 *  The pleasant part of this is that if we need to skip arguments we
 275 *  can just decrement argc and move argv, because the stack pointer
 276 *  is utterly unrelated to the location of the environment and
 277 *  argument vectors.
 278 *
 279 * Note that the S/390 people took the easy way out and hacked their
 280 * GCC to make the stack grow downwards.
 281 *
 282 * Final Note: For entry from syscall, the W (wide) bit of the PSW
 283 * is stuffed into the lowest bit of the user sp (%r30), so we fill
 284 * it in here from the current->personality
 285 */
 286
 287#ifdef CONFIG_64BIT
 288#define USER_WIDE_MODE  (!test_thread_flag(TIF_32BIT))
 289#else
 290#define USER_WIDE_MODE  0
 291#endif
 292
 293#define start_thread(regs, new_pc, new_sp) do {         \
 294        elf_addr_t *sp = (elf_addr_t *)new_sp;          \
 295        __u32 spaceid = (__u32)current->mm->context;    \
 296        elf_addr_t pc = (elf_addr_t)new_pc | 3;         \
 297        elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1;      \
 298                                                        \
 299        set_fs(USER_DS);                                \
 300        regs->iasq[0] = spaceid;                        \
 301        regs->iasq[1] = spaceid;                        \
 302        regs->iaoq[0] = pc;                             \
 303        regs->iaoq[1] = pc + 4;                         \
 304        regs->sr[2] = LINUX_GATEWAY_SPACE;              \
 305        regs->sr[3] = 0xffff;                           \
 306        regs->sr[4] = spaceid;                          \
 307        regs->sr[5] = spaceid;                          \
 308        regs->sr[6] = spaceid;                          \
 309        regs->sr[7] = spaceid;                          \
 310        regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \
 311        regs->fr[ 0] = 0LL;                             \
 312        regs->fr[ 1] = 0LL;                             \
 313        regs->fr[ 2] = 0LL;                             \
 314        regs->fr[ 3] = 0LL;                             \
 315        regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \
 316        regs->gr[31] = pc;                              \
 317                                                        \
 318        get_user(regs->gr[25], (argv - 1));             \
 319        regs->gr[24] = (long) argv;                     \
 320        regs->gr[23] = 0;                               \
 321} while(0)
 322
 323struct task_struct;
 324struct mm_struct;
 325
 326/* Free all resources held by a thread. */
 327extern void release_thread(struct task_struct *);
 328extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 329
 330/* Prepare to copy thread state - unlazy all lazy status */
 331#define prepare_to_copy(tsk)    do { } while (0)
 332
 333extern void map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm);
 334
 335extern unsigned long get_wchan(struct task_struct *p);
 336
 337#define KSTK_EIP(tsk)   ((tsk)->thread.regs.iaoq[0])
 338#define KSTK_ESP(tsk)   ((tsk)->thread.regs.gr[30])
 339
 340#define cpu_relax()     barrier()
 341
 342/* Used as a macro to identify the combined VIPT/PIPT cached
 343 * CPUs which require a guarantee of coherency (no inequivalent
 344 * aliases with different data, whether clean or not) to operate */
 345static inline int parisc_requires_coherency(void)
 346{
 347#ifdef CONFIG_PA8X00
 348        return (boot_cpu_data.cpu_type == mako) ||
 349                (boot_cpu_data.cpu_type == mako2);
 350#else
 351        return 0;
 352#endif
 353}
 354
 355#endif /* __ASSEMBLY__ */
 356
 357#endif /* __ASM_PARISC_PROCESSOR_H */
 358