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       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
  57 typedef 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. */
  63 struct 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. */
  94 struct task_struct;
  95 extern 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) \
 106 do { \
 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) \
 144 do { \
 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
 189 extern pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 190
 191 extern 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
 207 static 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
 220 static 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) */