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 <linux/config.h>
  17 #include <asm/asi.h>
  18 #include <asm/a.out.h>
  19 #include <asm/pstate.h>
  20 #include <asm/ptrace.h>
  21 #include <asm/segment.h>
  22 #include <asm/page.h>
  23
  24 /* Bus types */
  25 #define MCA_bus 0
  26 #define MCA_bus__is_a_macro /* for versions in ksyms.c */
  27
  28 /* The sparc has no problems with write protection */
  29 #define wp_works_ok 1
  30 #define wp_works_ok__is_a_macro /* for versions in ksyms.c */
  31
  32 /*
  33  * User lives in his very own context, and cannot reference us. Note
  34  * that TASK_SIZE is a misnomer, it really gives maximum user virtual
  35  * address that the kernel will allocate out.
  36  */
  37 #define VA_BITS         44
  38 #ifndef __ASSEMBLY__
  39 #define VPTE_SIZE       (1UL << (VA_BITS - PAGE_SHIFT + 3))
  40 #else
  41 #define VPTE_SIZE       (1 << (VA_BITS - PAGE_SHIFT + 3))
  42 #endif
  43 #define TASK_SIZE       ((unsigned long)-VPTE_SIZE)
  44
  45 /*
  46  * The vpte base must be able to hold the entire vpte, half
  47  * of which lives above, and half below, the base. And it
  48  * is placed as close to the highest address range as possible.
  49  */
  50 #define VPTE_BASE_SPITFIRE      (-(VPTE_SIZE/2))
  51 #if 1
  52 #define VPTE_BASE_CHEETAH       VPTE_BASE_SPITFIRE
  53 #else
  54 #define VPTE_BASE_CHEETAH       0xffe0000000000000
  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
  95 /* Return saved PC of a blocked thread. */
  96 struct task_struct;
  97 extern unsigned long thread_saved_pc(struct task_struct *);
  98
  99 /* On Uniprocessor, even in RMO processes see TSO semantics */
 100 #ifdef CONFIG_SMP
 101 #define TSTATE_INITIAL_MM       TSTATE_TSO
 102 #else
 103 #define TSTATE_INITIAL_MM       TSTATE_RMO
 104 #endif
 105
 106 /* Do necessary setup to start up a newly executed thread. */
 107 #define start_thread(regs, pc, sp) \
 108 do { \
 109         regs->tstate = (regs->tstate & (TSTATE_CWP)) | (TSTATE_INITIAL_MM|TSTATE_IE) | (ASI_PNF << 24); \
 110         regs->tpc = ((pc & (~3)) - 4); \
 111         regs->tnpc = regs->tpc + 4; \
 112         regs->y = 0; \
 113         set_thread_wstate(1 << 3); \
 114         if (current_thread_info()->utraps) { \
 115                 if (*(current_thread_info()->utraps) < 2) \
 116                         kfree(current_thread_info()->utraps); \
 117                 else \
 118                         (*(current_thread_info()->utraps))--; \
 119                 current_thread_info()->utraps = NULL; \
 120         } \
 121         __asm__ __volatile__( \
 122         "stx            %%g0, [%0 + %2 + 0x00]\n\t" \
 123         "stx            %%g0, [%0 + %2 + 0x08]\n\t" \
 124         "stx            %%g0, [%0 + %2 + 0x10]\n\t" \
 125         "stx            %%g0, [%0 + %2 + 0x18]\n\t" \
 126         "stx            %%g0, [%0 + %2 + 0x20]\n\t" \
 127         "stx            %%g0, [%0 + %2 + 0x28]\n\t" \
 128         "stx            %%g0, [%0 + %2 + 0x30]\n\t" \
 129         "stx            %%g0, [%0 + %2 + 0x38]\n\t" \
 130         "stx            %%g0, [%0 + %2 + 0x40]\n\t" \
 131         "stx            %%g0, [%0 + %2 + 0x48]\n\t" \
 132         "stx            %%g0, [%0 + %2 + 0x50]\n\t" \
 133         "stx            %%g0, [%0 + %2 + 0x58]\n\t" \
 134         "stx            %%g0, [%0 + %2 + 0x60]\n\t" \
 135         "stx            %%g0, [%0 + %2 + 0x68]\n\t" \
 136         "stx            %1,   [%0 + %2 + 0x70]\n\t" \
 137         "stx            %%g0, [%0 + %2 + 0x78]\n\t" \
 138         "wrpr           %%g0, (1 << 3), %%wstate\n\t" \
 139         : \
 140         : "r" (regs), "r" (sp - sizeof(struct reg_window) - STACK_BIAS), \
 141           "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))); \
 142 } while (0)
 143
 144 #define start_thread32(regs, pc, sp) \
 145 do { \
 146         pc &= 0x00000000ffffffffUL; \
 147         sp &= 0x00000000ffffffffUL; \
 148 \
 149         regs->tstate = (regs->tstate & (TSTATE_CWP))|(TSTATE_INITIAL_MM|TSTATE_IE|TSTATE_AM); \
 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 } while (0)
 183
 184 /* Free all resources held by a thread. */
 185 #define release_thread(tsk)             do { } while (0)
 186
 187 /* Prepare to copy thread state - unlazy all lazy status */
 188 #define prepare_to_copy(tsk)    do { } while (0)
 189
 190 extern pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 191
 192 extern unsigned long get_wchan(struct task_struct *task);
 193
 194 #define KSTK_EIP(tsk)  ((tsk)->thread_info->kregs->tpc)
 195 #define KSTK_ESP(tsk)  ((tsk)->thread_info->kregs->u_regs[UREG_FP])
 196
 197 #define cpu_relax()     barrier()
 198
 199 #endif /* !(__ASSEMBLY__) */
 200
 201 #endif /* !(__ASM_SPARC64_PROCESSOR_H) */