include/asm-sparc64/processor.h

   1 /* $Id: processor.h,v 1.83 2002/02/10 06:04:33 davem Exp $
   2  * include/asm-sparc64/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/a.out.h>
  18 #include <asm/pstate.h>
  19 #include <asm/ptrace.h>
  20 #include <asm/page.h>
  21
  22 /* The sparc has no problems with write protection */
  23 #define wp_works_ok 1
  24 #define wp_works_ok__is_a_macro /* for versions in ksyms.c */
  25
  26 /*
  27  * User lives in his very own context, and cannot reference us. Note
  28  * that TASK_SIZE is a misnomer, it really gives maximum user virtual
  29  * address that the kernel will allocate out.
  30  *
  31  * XXX No longer using virtual page tables, kill this upper limit...
  32  */
  33 #define VA_BITS         44
  34 #ifndef __ASSEMBLY__
  35 #define VPTE_SIZE       (1UL << (VA_BITS - PAGE_SHIFT + 3))
  36 #else
  37 #define VPTE_SIZE       (1 << (VA_BITS - PAGE_SHIFT + 3))
  38 #endif
  39
  40 #define TASK_SIZE       ((unsigned long)-VPTE_SIZE)
  41 #ifdef __KERNEL__
  42
  43 #define STACK_TOP32     ((1UL << 32UL) - PAGE_SIZE)
  44 #define STACK_TOP64     (0x0000080000000000UL - (1UL << 32UL))
  45
  46 #define STACK_TOP       (test_thread_flag(TIF_32BIT) ? \
  47                          STACK_TOP32 : STACK_TOP64)
  48
  49 #define STACK_TOP_MAX   STACK_TOP64
  50
  51 #endif
  52
  53 #ifndef __ASSEMBLY__
  54
  55 typedef struct {
  56         unsigned char seg;
  57 } mm_segment_t;
  58
  59 /* The Sparc processor specific thread struct. */
  60 /* XXX This should die, everything can go into thread_info now. */
  61 struct thread_struct {
  62 #ifdef CONFIG_DEBUG_SPINLOCK
  63         /* How many spinlocks held by this thread.
  64          * Used with spin lock debugging to catch tasks
  65          * sleeping illegally with locks held.
  66          */
  67         int smp_lock_count;
  68         unsigned int smp_lock_pc;
  69 #else
  70         int dummy; /* f'in gcc bug... */
  71 #endif
  72 };
  73
  74 #endif /* !(__ASSEMBLY__) */
  75
  76 #ifndef CONFIG_DEBUG_SPINLOCK
  77 #define INIT_THREAD  {                  \
  78         0,                              \
  79 }
  80 #else /* CONFIG_DEBUG_SPINLOCK */
  81 #define INIT_THREAD  {                                  \
  82 /* smp_lock_count, smp_lock_pc, */                      \
  83    0,              0,                                   \
  84 }
  85 #endif /* !(CONFIG_DEBUG_SPINLOCK) */
  86
  87 #ifndef __ASSEMBLY__
  88
  89 #include <linux/types.h>
  90
  91 /* Return saved PC of a blocked thread. */
  92 struct task_struct;
  93 extern unsigned long thread_saved_pc(struct task_struct *);
  94
  95 /* On Uniprocessor, even in RMO processes see TSO semantics */
  96 #ifdef CONFIG_SMP
  97 #define TSTATE_INITIAL_MM       TSTATE_TSO
  98 #else
  99 #define TSTATE_INITIAL_MM       TSTATE_RMO
 100 #endif
 101
 102 /* Do necessary setup to start up a newly executed thread. */
 103 #define start_thread(regs, pc, sp) \
 104 do { \
 105         unsigned long __asi = ASI_PNF; \
 106         regs->tstate = (regs->tstate & (TSTATE_CWP)) | (TSTATE_INITIAL_MM|TSTATE_IE) | (__asi << 24UL); \
 107         regs->tpc = ((pc & (~3)) - 4); \
 108         regs->tnpc = regs->tpc + 4; \
 109         regs->y = 0; \
 110         set_thread_wstate(1 << 3); \
 111         if (current_thread_info()->utraps) { \
 112                 if (*(current_thread_info()->utraps) < 2) \
 113                         kfree(current_thread_info()->utraps); \
 114                 else \
 115                         (*(current_thread_info()->utraps))--; \
 116                 current_thread_info()->utraps = NULL; \
 117         } \
 118         __asm__ __volatile__( \
 119         "stx            %%g0, [%0 + %2 + 0x00]\n\t" \
 120         "stx            %%g0, [%0 + %2 + 0x08]\n\t" \
 121         "stx            %%g0, [%0 + %2 + 0x10]\n\t" \
 122         "stx            %%g0, [%0 + %2 + 0x18]\n\t" \
 123         "stx            %%g0, [%0 + %2 + 0x20]\n\t" \
 124         "stx            %%g0, [%0 + %2 + 0x28]\n\t" \
 125         "stx            %%g0, [%0 + %2 + 0x30]\n\t" \
 126         "stx            %%g0, [%0 + %2 + 0x38]\n\t" \
 127         "stx            %%g0, [%0 + %2 + 0x40]\n\t" \
 128         "stx            %%g0, [%0 + %2 + 0x48]\n\t" \
 129         "stx            %%g0, [%0 + %2 + 0x50]\n\t" \
 130         "stx            %%g0, [%0 + %2 + 0x58]\n\t" \
 131         "stx            %%g0, [%0 + %2 + 0x60]\n\t" \
 132         "stx            %%g0, [%0 + %2 + 0x68]\n\t" \
 133         "stx            %1,   [%0 + %2 + 0x70]\n\t" \
 134         "stx            %%g0, [%0 + %2 + 0x78]\n\t" \
 135         "wrpr           %%g0, (1 << 3), %%wstate\n\t" \
 136         : \
 137         : "r" (regs), "r" (sp - sizeof(struct reg_window) - STACK_BIAS), \
 138           "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))); \
 139 } while (0)
 140
 141 #define start_thread32(regs, pc, sp) \
 142 do { \
 143         unsigned long __asi = ASI_PNF; \
 144         pc &= 0x00000000ffffffffUL; \
 145         sp &= 0x00000000ffffffffUL; \
 146         regs->tstate = (regs->tstate & (TSTATE_CWP))|(TSTATE_INITIAL_MM|TSTATE_IE|TSTATE_AM) | (__asi << 24UL); \
 147         regs->tpc = ((pc & (~3)) - 4); \
 148         regs->tnpc = regs->tpc + 4; \
 149         regs->y = 0; \
 150         set_thread_wstate(2 << 3); \
 151         if (current_thread_info()->utraps) { \
 152                 if (*(current_thread_info()->utraps) < 2) \
 153                         kfree(current_thread_info()->utraps); \
 154                 else \
 155                         (*(current_thread_info()->utraps))--; \
 156                 current_thread_info()->utraps = NULL; \
 157         } \
 158         __asm__ __volatile__( \
 159         "stx            %%g0, [%0 + %2 + 0x00]\n\t" \
 160         "stx            %%g0, [%0 + %2 + 0x08]\n\t" \
 161         "stx            %%g0, [%0 + %2 + 0x10]\n\t" \
 162         "stx            %%g0, [%0 + %2 + 0x18]\n\t" \
 163         "stx            %%g0, [%0 + %2 + 0x20]\n\t" \
 164         "stx            %%g0, [%0 + %2 + 0x28]\n\t" \
 165         "stx            %%g0, [%0 + %2 + 0x30]\n\t" \
 166         "stx            %%g0, [%0 + %2 + 0x38]\n\t" \
 167         "stx            %%g0, [%0 + %2 + 0x40]\n\t" \
 168         "stx            %%g0, [%0 + %2 + 0x48]\n\t" \
 169         "stx            %%g0, [%0 + %2 + 0x50]\n\t" \
 170         "stx            %%g0, [%0 + %2 + 0x58]\n\t" \
 171         "stx            %%g0, [%0 + %2 + 0x60]\n\t" \
 172         "stx            %%g0, [%0 + %2 + 0x68]\n\t" \
 173         "stx            %1,   [%0 + %2 + 0x70]\n\t" \
 174         "stx            %%g0, [%0 + %2 + 0x78]\n\t" \
 175         "wrpr           %%g0, (2 << 3), %%wstate\n\t" \
 176         : \
 177         : "r" (regs), "r" (sp - sizeof(struct reg_window32)), \
 178           "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))); \
 179 } while (0)
 180
 181 /* Free all resources held by a thread. */
 182 #define release_thread(tsk)             do { } while (0)
 183
 184 /* Prepare to copy thread state - unlazy all lazy status */
 185 #define prepare_to_copy(tsk)    do { } while (0)
 186
 187 extern pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 188
 189 extern unsigned long get_wchan(struct task_struct *task);
 190
 191 #define task_pt_regs(tsk) (task_thread_info(tsk)->kregs)
 192 #define KSTK_EIP(tsk)  (task_pt_regs(tsk)->tpc)
 193 #define KSTK_ESP(tsk)  (task_pt_regs(tsk)->u_regs[UREG_FP])
 194
 195 #define cpu_relax()     barrier()
 196
 197 /* Prefetch support.  This is tuned for UltraSPARC-III and later.
 198  * UltraSPARC-I will treat these as nops, and UltraSPARC-II has
 199  * a shallower prefetch queue than later chips.
 200  */
 201 #define ARCH_HAS_PREFETCH
 202 #define ARCH_HAS_PREFETCHW
 203 #define ARCH_HAS_SPINLOCK_PREFETCH
 204
 205 static inline void prefetch(const void *x)
 206 {
 207         /* We do not use the read prefetch mnemonic because that
 208          * prefetches into the prefetch-cache which only is accessible
 209          * by floating point operations in UltraSPARC-III and later.
 210          * By contrast, "#one_write" prefetches into the L2 cache
 211          * in shared state.
 212          */
 213         __asm__ __volatile__("prefetch [%0], #one_write"
 214                              : /* no outputs */
 215                              : "r" (x));
 216 }
 217
 218 static inline void prefetchw(const void *x)
 219 {
 220         /* The most optimal prefetch to use for writes is
 221          * "#n_writes".  This brings the cacheline into the
 222          * L2 cache in "owned" state.
 223          */
 224         __asm__ __volatile__("prefetch [%0], #n_writes"
 225                              : /* no outputs */
 226                              : "r" (x));
 227 }
 228
 229 #define spin_lock_prefetch(x)   prefetchw(x)
 230
 231 #define HAVE_ARCH_PICK_MMAP_LAYOUT
 232
 233 #endif /* !(__ASSEMBLY__) */
 234
 235 #endif /* !(__ASM_SPARC64_PROCESSOR_H) */