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 /* 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 \
  43         (test_thread_flag(TIF_32BIT) ? \
  44          (1UL << 32UL) : ((unsigned long)-VPTE_SIZE))
  45 #ifdef __KERNEL__
  46
  47 #define STACK_TOP32     ((1UL << 32UL) - PAGE_SIZE)
  48 #define STACK_TOP64     (0x0000080000000000UL - (1UL << 32UL))
  49
  50 #define STACK_TOP       (test_thread_flag(TIF_32BIT) ? \
  51                          STACK_TOP32 : STACK_TOP64)
  52
  53 #define STACK_TOP_MAX   STACK_TOP64
  54
  55 #endif
  56
  57 #ifndef __ASSEMBLY__
  58
  59 typedef struct {
  60         unsigned char seg;
  61 } mm_segment_t;
  62
  63 /* The Sparc processor specific thread struct. */
  64 /* XXX This should die, everything can go into thread_info now. */
  65 struct thread_struct {
  66 #ifdef CONFIG_DEBUG_SPINLOCK
  67         /* How many spinlocks held by this thread.
  68          * Used with spin lock debugging to catch tasks
  69          * sleeping illegally with locks held.
  70          */
  71         int smp_lock_count;
  72         unsigned int smp_lock_pc;
  73 #else
  74         int dummy; /* f'in gcc bug... */
  75 #endif
  76 };
  77
  78 #endif /* !(__ASSEMBLY__) */
  79
  80 #ifndef CONFIG_DEBUG_SPINLOCK
  81 #define INIT_THREAD  {                  \
  82         0,                              \
  83 }
  84 #else /* CONFIG_DEBUG_SPINLOCK */
  85 #define INIT_THREAD  {                                  \
  86 /* smp_lock_count, smp_lock_pc, */                      \
  87    0,              0,                                   \
  88 }
  89 #endif /* !(CONFIG_DEBUG_SPINLOCK) */
  90
  91 #ifndef __ASSEMBLY__
  92
  93 #include <linux/types.h>
  94 #include <asm/fpumacro.h>
  95
  96 /* Return saved PC of a blocked thread. */
  97 struct task_struct;
  98 extern unsigned long thread_saved_pc(struct task_struct *);
  99
 100 /* On Uniprocessor, even in RMO processes see TSO semantics */
 101 #ifdef CONFIG_SMP
 102 #define TSTATE_INITIAL_MM       TSTATE_TSO
 103 #else
 104 #define TSTATE_INITIAL_MM       TSTATE_RMO
 105 #endif
 106
 107 /* Do necessary setup to start up a newly executed thread. */
 108 #define start_thread(regs, pc, sp) \
 109 do { \
 110         unsigned long __asi = ASI_PNF; \
 111         regs->tstate = (regs->tstate & (TSTATE_CWP)) | (TSTATE_INITIAL_MM|TSTATE_IE) | (__asi << 24UL); \
 112         regs->tpc = ((pc & (~3)) - 4); \
 113         regs->tnpc = regs->tpc + 4; \
 114         regs->y = 0; \
 115         set_thread_wstate(1 << 3); \
 116         if (current_thread_info()->utraps) { \
 117                 if (*(current_thread_info()->utraps) < 2) \
 118                         kfree(current_thread_info()->utraps); \
 119                 else \
 120                         (*(current_thread_info()->utraps))--; \
 121                 current_thread_info()->utraps = NULL; \
 122         } \
 123         __asm__ __volatile__( \
 124         "stx            %%g0, [%0 + %2 + 0x00]\n\t" \
 125         "stx            %%g0, [%0 + %2 + 0x08]\n\t" \
 126         "stx            %%g0, [%0 + %2 + 0x10]\n\t" \
 127         "stx            %%g0, [%0 + %2 + 0x18]\n\t" \
 128         "stx            %%g0, [%0 + %2 + 0x20]\n\t" \
 129         "stx            %%g0, [%0 + %2 + 0x28]\n\t" \
 130         "stx            %%g0, [%0 + %2 + 0x30]\n\t" \
 131         "stx            %%g0, [%0 + %2 + 0x38]\n\t" \
 132         "stx            %%g0, [%0 + %2 + 0x40]\n\t" \
 133         "stx            %%g0, [%0 + %2 + 0x48]\n\t" \
 134         "stx            %%g0, [%0 + %2 + 0x50]\n\t" \
 135         "stx            %%g0, [%0 + %2 + 0x58]\n\t" \
 136         "stx            %%g0, [%0 + %2 + 0x60]\n\t" \
 137         "stx            %%g0, [%0 + %2 + 0x68]\n\t" \
 138         "stx            %1,   [%0 + %2 + 0x70]\n\t" \
 139         "stx            %%g0, [%0 + %2 + 0x78]\n\t" \
 140         "wrpr           %%g0, (1 << 3), %%wstate\n\t" \
 141         : \
 142         : "r" (regs), "r" (sp - sizeof(struct reg_window) - STACK_BIAS), \
 143           "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))); \
 144         fprs_write(0);  \
 145         current_thread_info()->xfsr[0] = 0;     \
 146         current_thread_info()->fpsaved[0] = 0;  \
 147         regs->tstate &= ~TSTATE_PEF;    \
 148 } while (0)
 149
 150 #define start_thread32(regs, pc, sp) \
 151 do { \
 152         unsigned long __asi = ASI_PNF; \
 153         pc &= 0x00000000ffffffffUL; \
 154         sp &= 0x00000000ffffffffUL; \
 155         regs->tstate = (regs->tstate & (TSTATE_CWP))|(TSTATE_INITIAL_MM|TSTATE_IE|TSTATE_AM) | (__asi << 24UL); \
 156         regs->tpc = ((pc & (~3)) - 4); \
 157         regs->tnpc = regs->tpc + 4; \
 158         regs->y = 0; \
 159         set_thread_wstate(2 << 3); \
 160         if (current_thread_info()->utraps) { \
 161                 if (*(current_thread_info()->utraps) < 2) \
 162                         kfree(current_thread_info()->utraps); \
 163                 else \
 164                         (*(current_thread_info()->utraps))--; \
 165                 current_thread_info()->utraps = NULL; \
 166         } \
 167         __asm__ __volatile__( \
 168         "stx            %%g0, [%0 + %2 + 0x00]\n\t" \
 169         "stx            %%g0, [%0 + %2 + 0x08]\n\t" \
 170         "stx            %%g0, [%0 + %2 + 0x10]\n\t" \
 171         "stx            %%g0, [%0 + %2 + 0x18]\n\t" \
 172         "stx            %%g0, [%0 + %2 + 0x20]\n\t" \
 173         "stx            %%g0, [%0 + %2 + 0x28]\n\t" \
 174         "stx            %%g0, [%0 + %2 + 0x30]\n\t" \
 175         "stx            %%g0, [%0 + %2 + 0x38]\n\t" \
 176         "stx            %%g0, [%0 + %2 + 0x40]\n\t" \
 177         "stx            %%g0, [%0 + %2 + 0x48]\n\t" \
 178         "stx            %%g0, [%0 + %2 + 0x50]\n\t" \
 179         "stx            %%g0, [%0 + %2 + 0x58]\n\t" \
 180         "stx            %%g0, [%0 + %2 + 0x60]\n\t" \
 181         "stx            %%g0, [%0 + %2 + 0x68]\n\t" \
 182         "stx            %1,   [%0 + %2 + 0x70]\n\t" \
 183         "stx            %%g0, [%0 + %2 + 0x78]\n\t" \
 184         "wrpr           %%g0, (2 << 3), %%wstate\n\t" \
 185         : \
 186         : "r" (regs), "r" (sp - sizeof(struct reg_window32)), \
 187           "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))); \
 188         fprs_write(0);  \
 189         current_thread_info()->xfsr[0] = 0;     \
 190         current_thread_info()->fpsaved[0] = 0;  \
 191         regs->tstate &= ~TSTATE_PEF;    \
 192 } while (0)
 193
 194 /* Free all resources held by a thread. */
 195 #define release_thread(tsk)             do { } while (0)
 196
 197 extern unsigned long get_wchan(struct task_struct *task);
 198
 199 #define task_pt_regs(tsk) (task_thread_info(tsk)->kregs)
 200 #define KSTK_EIP(tsk)  (task_pt_regs(tsk)->tpc)
 201 #define KSTK_ESP(tsk)  (task_pt_regs(tsk)->u_regs[UREG_FP])
 202
 203 /* Please see the commentary in asm/backoff.h for a description of
 204  * what these instructions are doing and how they have been choosen.
 205  * To make a long story short, we are trying to yield the current cpu
 206  * strand during busy loops.
 207  */
 208 #define cpu_relax()     asm volatile("\n99:\n\t"                        \
 209                                      "rd        %%ccr, %%g0\n\t"        \
 210                                      "rd        %%ccr, %%g0\n\t"        \
 211                                      "rd        %%ccr, %%g0\n\t"        \
 212                                      ".section  .pause_3insn_patch,\"ax\"\n\t"\
 213                                      ".word     99b\n\t"                \
 214                                      "wr        %%g0, 128, %%asr27\n\t" \
 215                                      "nop\n\t"                          \
 216                                      "nop\n\t"                          \
 217                                      ".previous"                        \
 218                                      ::: "memory")
 219
 220 /* Prefetch support.  This is tuned for UltraSPARC-III and later.
 221  * UltraSPARC-I will treat these as nops, and UltraSPARC-II has
 222  * a shallower prefetch queue than later chips.
 223  */
 224 #define ARCH_HAS_PREFETCH
 225 #define ARCH_HAS_PREFETCHW
 226 #define ARCH_HAS_SPINLOCK_PREFETCH
 227
 228 static inline void prefetch(const void *x)
 229 {
 230         /* We do not use the read prefetch mnemonic because that
 231          * prefetches into the prefetch-cache which only is accessible
 232          * by floating point operations in UltraSPARC-III and later.
 233          * By contrast, "#one_write" prefetches into the L2 cache
 234          * in shared state.
 235          */
 236         __asm__ __volatile__("prefetch [%0], #one_write"
 237                              : /* no outputs */
 238                              : "r" (x));
 239 }
 240
 241 static inline void prefetchw(const void *x)
 242 {
 243         /* The most optimal prefetch to use for writes is
 244          * "#n_writes".  This brings the cacheline into the
 245          * L2 cache in "owned" state.
 246          */
 247         __asm__ __volatile__("prefetch [%0], #n_writes"
 248                              : /* no outputs */
 249                              : "r" (x));
 250 }
 251
 252 #define spin_lock_prefetch(x)   prefetchw(x)
 253
 254 #define HAVE_ARCH_PICK_MMAP_LAYOUT
 255
 256 #endif /* !(__ASSEMBLY__) */
 257
 258 #endif /* !(__ASM_SPARC64_PROCESSOR_H) */