arch/sparc/include/asm/processor_64.h

   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 /*
  22  * User lives in his very own context, and cannot reference us. Note
  23  * that TASK_SIZE is a misnomer, it really gives maximum user virtual
  24  * address that the kernel will allocate out.
  25  *
  26  * XXX No longer using virtual page tables, kill this upper limit...
  27  */
  28 #define VA_BITS         44
  29 #ifndef __ASSEMBLY__
  30 #define VPTE_SIZE       (1UL << (VA_BITS - PAGE_SHIFT + 3))
  31 #else
  32 #define VPTE_SIZE       (1 << (VA_BITS - PAGE_SHIFT + 3))
  33 #endif
  34
  35 #define TASK_SIZE_OF(tsk) \
  36         (test_tsk_thread_flag(tsk,TIF_32BIT) ? \
  37          (1UL << 32UL) : ((unsigned long)-VPTE_SIZE))
  38 #define TASK_SIZE \
  39         (test_thread_flag(TIF_32BIT) ? \
  40          (1UL << 32UL) : ((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 #include <asm/fpumacro.h>
  91
  92 struct task_struct;
  93
  94 /* On Uniprocessor, even in RMO processes see TSO semantics */
  95 #ifdef CONFIG_SMP
  96 #define TSTATE_INITIAL_MM       TSTATE_TSO
  97 #else
  98 #define TSTATE_INITIAL_MM       TSTATE_RMO
  99 #endif
 100
 101 /* Do necessary setup to start up a newly executed thread. */
 102 #define start_thread(regs, pc, sp) \
 103 do { \
 104         unsigned long __asi = ASI_PNF; \
 105         regs->tstate = (regs->tstate & (TSTATE_CWP)) | (TSTATE_INITIAL_MM|TSTATE_IE) | (__asi << 24UL); \
 106         regs->tpc = ((pc & (~3)) - 4); \
 107         regs->tnpc = regs->tpc + 4; \
 108         regs->y = 0; \
 109         set_thread_wstate(1 << 3); \
 110         if (current_thread_info()->utraps) { \
 111                 if (*(current_thread_info()->utraps) < 2) \
 112                         kfree(current_thread_info()->utraps); \
 113                 else \
 114                         (*(current_thread_info()->utraps))--; \
 115                 current_thread_info()->utraps = NULL; \
 116         } \
 117         __asm__ __volatile__( \
 118         "stx            %%g0, [%0 + %2 + 0x00]\n\t" \
 119         "stx            %%g0, [%0 + %2 + 0x08]\n\t" \
 120         "stx            %%g0, [%0 + %2 + 0x10]\n\t" \
 121         "stx            %%g0, [%0 + %2 + 0x18]\n\t" \
 122         "stx            %%g0, [%0 + %2 + 0x20]\n\t" \
 123         "stx            %%g0, [%0 + %2 + 0x28]\n\t" \
 124         "stx            %%g0, [%0 + %2 + 0x30]\n\t" \
 125         "stx            %%g0, [%0 + %2 + 0x38]\n\t" \
 126         "stx            %%g0, [%0 + %2 + 0x40]\n\t" \
 127         "stx            %%g0, [%0 + %2 + 0x48]\n\t" \
 128         "stx            %%g0, [%0 + %2 + 0x50]\n\t" \
 129         "stx            %%g0, [%0 + %2 + 0x58]\n\t" \
 130         "stx            %%g0, [%0 + %2 + 0x60]\n\t" \
 131         "stx            %%g0, [%0 + %2 + 0x68]\n\t" \
 132         "stx            %1,   [%0 + %2 + 0x70]\n\t" \
 133         "stx            %%g0, [%0 + %2 + 0x78]\n\t" \
 134         "wrpr           %%g0, (1 << 3), %%wstate\n\t" \
 135         : \
 136         : "r" (regs), "r" (sp - sizeof(struct reg_window) - STACK_BIAS), \
 137           "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))); \
 138         fprs_write(0);  \
 139         current_thread_info()->xfsr[0] = 0;     \
 140         current_thread_info()->fpsaved[0] = 0;  \
 141         regs->tstate &= ~TSTATE_PEF;    \
 142 } while (0)
 143
 144 #define start_thread32(regs, pc, sp) \
 145 do { \
 146         unsigned long __asi = ASI_PNF; \
 147         pc &= 0x00000000ffffffffUL; \
 148         sp &= 0x00000000ffffffffUL; \
 149         regs->tstate = (regs->tstate & (TSTATE_CWP))|(TSTATE_INITIAL_MM|TSTATE_IE|TSTATE_AM) | (__asi << 24UL); \
 150         regs->tpc = ((pc & (~3)) - 4); \
 151         regs->tnpc = regs->tpc + 4; \
 152         regs->y = 0; \
 153         set_thread_wstate(2 << 3); \
 154         if (current_thread_info()->utraps) { \
 155                 if (*(current_thread_info()->utraps) < 2) \
 156                         kfree(current_thread_info()->utraps); \
 157                 else \
 158                         (*(current_thread_info()->utraps))--; \
 159                 current_thread_info()->utraps = NULL; \
 160         } \
 161         __asm__ __volatile__( \
 162         "stx            %%g0, [%0 + %2 + 0x00]\n\t" \
 163         "stx            %%g0, [%0 + %2 + 0x08]\n\t" \
 164         "stx            %%g0, [%0 + %2 + 0x10]\n\t" \
 165         "stx            %%g0, [%0 + %2 + 0x18]\n\t" \
 166         "stx            %%g0, [%0 + %2 + 0x20]\n\t" \
 167         "stx            %%g0, [%0 + %2 + 0x28]\n\t" \
 168         "stx            %%g0, [%0 + %2 + 0x30]\n\t" \
 169         "stx            %%g0, [%0 + %2 + 0x38]\n\t" \
 170         "stx            %%g0, [%0 + %2 + 0x40]\n\t" \
 171         "stx            %%g0, [%0 + %2 + 0x48]\n\t" \
 172         "stx            %%g0, [%0 + %2 + 0x50]\n\t" \
 173         "stx            %%g0, [%0 + %2 + 0x58]\n\t" \
 174         "stx            %%g0, [%0 + %2 + 0x60]\n\t" \
 175         "stx            %%g0, [%0 + %2 + 0x68]\n\t" \
 176         "stx            %1,   [%0 + %2 + 0x70]\n\t" \
 177         "stx            %%g0, [%0 + %2 + 0x78]\n\t" \
 178         "wrpr           %%g0, (2 << 3), %%wstate\n\t" \
 179         : \
 180         : "r" (regs), "r" (sp - sizeof(struct reg_window32)), \
 181           "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))); \
 182         fprs_write(0);  \
 183         current_thread_info()->xfsr[0] = 0;     \
 184         current_thread_info()->fpsaved[0] = 0;  \
 185         regs->tstate &= ~TSTATE_PEF;    \
 186 } while (0)
 187
 188 /* Free all resources held by a thread. */
 189 #define release_thread(tsk)             do { } while (0)
 190
 191 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 /* Please see the commentary in asm/backoff.h for a description of
 198  * what these instructions are doing and how they have been chosen.
 199  * To make a long story short, we are trying to yield the current cpu
 200  * strand during busy loops.
 201  */
 202 #define cpu_relax()     asm volatile("\n99:\n\t"                        \
 203                                      "rd        %%ccr, %%g0\n\t"        \
 204                                      "rd        %%ccr, %%g0\n\t"        \
 205                                      "rd        %%ccr, %%g0\n\t"        \
 206                                      ".section  .pause_3insn_patch,\"ax\"\n\t"\
 207                                      ".word     99b\n\t"                \
 208                                      "wr        %%g0, 128, %%asr27\n\t" \
 209                                      "nop\n\t"                          \
 210                                      "nop\n\t"                          \
 211                                      ".previous"                        \
 212                                      ::: "memory")
 213
 214 /* Prefetch support.  This is tuned for UltraSPARC-III and later.
 215  * UltraSPARC-I will treat these as nops, and UltraSPARC-II has
 216  * a shallower prefetch queue than later chips.
 217  */
 218 #define ARCH_HAS_PREFETCH
 219 #define ARCH_HAS_PREFETCHW
 220 #define ARCH_HAS_SPINLOCK_PREFETCH
 221
 222 static inline void prefetch(const void *x)
 223 {
 224         /* We do not use the read prefetch mnemonic because that
 225          * prefetches into the prefetch-cache which only is accessible
 226          * by floating point operations in UltraSPARC-III and later.
 227          * By contrast, "#one_write" prefetches into the L2 cache
 228          * in shared state.
 229          */
 230         __asm__ __volatile__("prefetch [%0], #one_write"
 231                              : /* no outputs */
 232                              : "r" (x));
 233 }
 234
 235 static inline void prefetchw(const void *x)
 236 {
 237         /* The most optimal prefetch to use for writes is
 238          * "#n_writes".  This brings the cacheline into the
 239          * L2 cache in "owned" state.
 240          */
 241         __asm__ __volatile__("prefetch [%0], #n_writes"
 242                              : /* no outputs */
 243                              : "r" (x));
 244 }
 245
 246 #define spin_lock_prefetch(x)   prefetchw(x)
 247
 248 #define HAVE_ARCH_PICK_MMAP_LAYOUT
 249
 250 int do_mathemu(struct pt_regs *regs, struct fpustate *f, bool illegal_insn_trap);
 251
 252 #endif /* !(__ASSEMBLY__) */
 253
 254 #endif /* !(__ASM_SPARC64_PROCESSOR_H) */