linux/arch/sparc/include/asm/processor_64.h
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   1/*
   2 * include/asm/processor.h
   3 *
   4 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
   5 */
   6
   7#ifndef __ASM_SPARC64_PROCESSOR_H
   8#define __ASM_SPARC64_PROCESSOR_H
   9
  10/*
  11 * Sparc64 implementation of macro that returns current
  12 * instruction pointer ("program counter").
  13 */
  14#define current_text_addr() ({ void *pc; __asm__("rd %%pc, %0" : "=r" (pc)); pc; })
  15
  16#include <asm/asi.h>
  17#include <asm/pstate.h>
  18#include <asm/ptrace.h>
  19#include <asm/page.h>
  20
  21/* The sparc has no problems with write protection */
  22#define wp_works_ok 1
  23#define wp_works_ok__is_a_macro /* for versions in ksyms.c */
  24
  25/*
  26 * User lives in his very own context, and cannot reference us. Note
  27 * that TASK_SIZE is a misnomer, it really gives maximum user virtual
  28 * address that the kernel will allocate out.
  29 *
  30 * XXX No longer using virtual page tables, kill this upper limit...
  31 */
  32#define VA_BITS         44
  33#ifndef __ASSEMBLY__
  34#define VPTE_SIZE       (1UL << (VA_BITS - PAGE_SHIFT + 3))
  35#else
  36#define VPTE_SIZE       (1 << (VA_BITS - PAGE_SHIFT + 3))
  37#endif
  38
  39#define TASK_SIZE_OF(tsk) \
  40        (test_tsk_thread_flag(tsk,TIF_32BIT) ? \
  41         (1UL << 32UL) : ((unsigned long)-VPTE_SIZE))
  42#define TASK_SIZE       TASK_SIZE_OF(current)
  43#ifdef __KERNEL__
  44
  45#define STACK_TOP32     ((1UL << 32UL) - PAGE_SIZE)
  46#define STACK_TOP64     (0x0000080000000000UL - (1UL << 32UL))
  47
  48#define STACK_TOP       (test_thread_flag(TIF_32BIT) ? \
  49                         STACK_TOP32 : STACK_TOP64)
  50
  51#define STACK_TOP_MAX   STACK_TOP64
  52
  53#endif
  54
  55#ifndef __ASSEMBLY__
  56
  57typedef struct {
  58        unsigned char seg;
  59} mm_segment_t;
  60
  61/* The Sparc processor specific thread struct. */
  62/* XXX This should die, everything can go into thread_info now. */
  63struct thread_struct {
  64#ifdef CONFIG_DEBUG_SPINLOCK
  65        /* How many spinlocks held by this thread.
  66         * Used with spin lock debugging to catch tasks
  67         * sleeping illegally with locks held.
  68         */
  69        int smp_lock_count;
  70        unsigned int smp_lock_pc;
  71#else
  72        int dummy; /* f'in gcc bug... */
  73#endif
  74};
  75
  76#endif /* !(__ASSEMBLY__) */
  77
  78#ifndef CONFIG_DEBUG_SPINLOCK
  79#define INIT_THREAD  {                  \
  80        0,                              \
  81}
  82#else /* CONFIG_DEBUG_SPINLOCK */
  83#define INIT_THREAD  {                                  \
  84/* smp_lock_count, smp_lock_pc, */                      \
  85   0,              0,                                   \
  86}
  87#endif /* !(CONFIG_DEBUG_SPINLOCK) */
  88
  89#ifndef __ASSEMBLY__
  90
  91#include <linux/types.h>
  92
  93/* Return saved PC of a blocked thread. */
  94struct task_struct;
  95extern unsigned long thread_saved_pc(struct task_struct *);
  96
  97/* On Uniprocessor, even in RMO processes see TSO semantics */
  98#ifdef CONFIG_SMP
  99#define TSTATE_INITIAL_MM       TSTATE_TSO
 100#else
 101#define TSTATE_INITIAL_MM       TSTATE_RMO
 102#endif
 103
 104/* Do necessary setup to start up a newly executed thread. */
 105#define start_thread(regs, pc, sp) \
 106do { \
 107        unsigned long __asi = ASI_PNF; \
 108        regs->tstate = (regs->tstate & (TSTATE_CWP)) | (TSTATE_INITIAL_MM|TSTATE_IE) | (__asi << 24UL); \
 109        regs->tpc = ((pc & (~3)) - 4); \
 110        regs->tnpc = regs->tpc + 4; \
 111        regs->y = 0; \
 112        set_thread_wstate(1 << 3); \
 113        if (current_thread_info()->utraps) { \
 114                if (*(current_thread_info()->utraps) < 2) \
 115                        kfree(current_thread_info()->utraps); \
 116                else \
 117                        (*(current_thread_info()->utraps))--; \
 118                current_thread_info()->utraps = NULL; \
 119        } \
 120        __asm__ __volatile__( \
 121        "stx            %%g0, [%0 + %2 + 0x00]\n\t" \
 122        "stx            %%g0, [%0 + %2 + 0x08]\n\t" \
 123        "stx            %%g0, [%0 + %2 + 0x10]\n\t" \
 124        "stx            %%g0, [%0 + %2 + 0x18]\n\t" \
 125        "stx            %%g0, [%0 + %2 + 0x20]\n\t" \
 126        "stx            %%g0, [%0 + %2 + 0x28]\n\t" \
 127        "stx            %%g0, [%0 + %2 + 0x30]\n\t" \
 128        "stx            %%g0, [%0 + %2 + 0x38]\n\t" \
 129        "stx            %%g0, [%0 + %2 + 0x40]\n\t" \
 130        "stx            %%g0, [%0 + %2 + 0x48]\n\t" \
 131        "stx            %%g0, [%0 + %2 + 0x50]\n\t" \
 132        "stx            %%g0, [%0 + %2 + 0x58]\n\t" \
 133        "stx            %%g0, [%0 + %2 + 0x60]\n\t" \
 134        "stx            %%g0, [%0 + %2 + 0x68]\n\t" \
 135        "stx            %1,   [%0 + %2 + 0x70]\n\t" \
 136        "stx            %%g0, [%0 + %2 + 0x78]\n\t" \
 137        "wrpr           %%g0, (1 << 3), %%wstate\n\t" \
 138        : \
 139        : "r" (regs), "r" (sp - sizeof(struct reg_window) - STACK_BIAS), \
 140          "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))); \
 141} while (0)
 142
 143#define start_thread32(regs, pc, sp) \
 144do { \
 145        unsigned long __asi = ASI_PNF; \
 146        pc &= 0x00000000ffffffffUL; \
 147        sp &= 0x00000000ffffffffUL; \
 148        regs->tstate = (regs->tstate & (TSTATE_CWP))|(TSTATE_INITIAL_MM|TSTATE_IE|TSTATE_AM) | (__asi << 24UL); \
 149        regs->tpc = ((pc & (~3)) - 4); \
 150        regs->tnpc = regs->tpc + 4; \
 151        regs->y = 0; \
 152        set_thread_wstate(2 << 3); \
 153        if (current_thread_info()->utraps) { \
 154                if (*(current_thread_info()->utraps) < 2) \
 155                        kfree(current_thread_info()->utraps); \
 156                else \
 157                        (*(current_thread_info()->utraps))--; \
 158                current_thread_info()->utraps = NULL; \
 159        } \
 160        __asm__ __volatile__( \
 161        "stx            %%g0, [%0 + %2 + 0x00]\n\t" \
 162        "stx            %%g0, [%0 + %2 + 0x08]\n\t" \
 163        "stx            %%g0, [%0 + %2 + 0x10]\n\t" \
 164        "stx            %%g0, [%0 + %2 + 0x18]\n\t" \
 165        "stx            %%g0, [%0 + %2 + 0x20]\n\t" \
 166        "stx            %%g0, [%0 + %2 + 0x28]\n\t" \
 167        "stx            %%g0, [%0 + %2 + 0x30]\n\t" \
 168        "stx            %%g0, [%0 + %2 + 0x38]\n\t" \
 169        "stx            %%g0, [%0 + %2 + 0x40]\n\t" \
 170        "stx            %%g0, [%0 + %2 + 0x48]\n\t" \
 171        "stx            %%g0, [%0 + %2 + 0x50]\n\t" \
 172        "stx            %%g0, [%0 + %2 + 0x58]\n\t" \
 173        "stx            %%g0, [%0 + %2 + 0x60]\n\t" \
 174        "stx            %%g0, [%0 + %2 + 0x68]\n\t" \
 175        "stx            %1,   [%0 + %2 + 0x70]\n\t" \
 176        "stx            %%g0, [%0 + %2 + 0x78]\n\t" \
 177        "wrpr           %%g0, (2 << 3), %%wstate\n\t" \
 178        : \
 179        : "r" (regs), "r" (sp - sizeof(struct reg_window32)), \
 180          "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))); \
 181} while (0)
 182
 183/* Free all resources held by a thread. */
 184#define release_thread(tsk)             do { } while (0)
 185
 186/* Prepare to copy thread state - unlazy all lazy status */
 187#define prepare_to_copy(tsk)    do { } while (0)
 188
 189extern pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 190
 191extern unsigned long get_wchan(struct task_struct *task);
 192
 193#define task_pt_regs(tsk) (task_thread_info(tsk)->kregs)
 194#define KSTK_EIP(tsk)  (task_pt_regs(tsk)->tpc)
 195#define KSTK_ESP(tsk)  (task_pt_regs(tsk)->u_regs[UREG_FP])
 196
 197#define cpu_relax()     barrier()
 198
 199/* Prefetch support.  This is tuned for UltraSPARC-III and later.
 200 * UltraSPARC-I will treat these as nops, and UltraSPARC-II has
 201 * a shallower prefetch queue than later chips.
 202 */
 203#define ARCH_HAS_PREFETCH
 204#define ARCH_HAS_PREFETCHW
 205#define ARCH_HAS_SPINLOCK_PREFETCH
 206
 207static inline void prefetch(const void *x)
 208{
 209        /* We do not use the read prefetch mnemonic because that
 210         * prefetches into the prefetch-cache which only is accessible
 211         * by floating point operations in UltraSPARC-III and later.
 212         * By contrast, "#one_write" prefetches into the L2 cache
 213         * in shared state.
 214         */
 215        __asm__ __volatile__("prefetch [%0], #one_write"
 216                             : /* no outputs */
 217                             : "r" (x));
 218}
 219
 220static inline void prefetchw(const void *x)
 221{
 222        /* The most optimal prefetch to use for writes is
 223         * "#n_writes".  This brings the cacheline into the
 224         * L2 cache in "owned" state.
 225         */
 226        __asm__ __volatile__("prefetch [%0], #n_writes"
 227                             : /* no outputs */
 228                             : "r" (x));
 229}
 230
 231#define spin_lock_prefetch(x)   prefetchw(x)
 232
 233#define HAVE_ARCH_PICK_MMAP_LAYOUT
 234
 235#endif /* !(__ASSEMBLY__) */
 236
 237#endif /* !(__ASM_SPARC64_PROCESSOR_H) */
 238
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