LXR linux/arch/sparc/include/asm/processor

   1/* include/asm/processor.h
   2 *
   3 * Copyright (C) 1994 David S. Miller (davem@caip.rutgers.edu)
   4 */
   5
   6#ifndef __ASM_SPARC_PROCESSOR_H
   7#define __ASM_SPARC_PROCESSOR_H
   8
   9/*
  10 * Sparc32 implementation of macro that returns current
  11 * instruction pointer ("program counter").
  12 */
  13#define current_text_addr() ({ void *pc; __asm__("sethi %%hi(1f), %0; or %0, %%lo(1f), %0;\n1:" : "=r" (pc)); pc; })
  14
  15#include <asm/psr.h>
  16#include <asm/ptrace.h>
  17#include <asm/head.h>
  18#include <asm/signal.h>
  19#include <asm/page.h>
  20
  21/*
  22 * The sparc has no problems with write protection
  23 */
  24#define wp_works_ok 1
  25#define wp_works_ok__is_a_macro /* for versions in ksyms.c */
  26
  27/* Whee, this is STACK_TOP + PAGE_SIZE and the lowest kernel address too...
  28 * That one page is used to protect kernel from intruders, so that
  29 * we can make our access_ok test faster
  30 */
  31#define TASK_SIZE       PAGE_OFFSET
  32#ifdef __KERNEL__
  33#define STACK_TOP       (PAGE_OFFSET - PAGE_SIZE)
  34#define STACK_TOP_MAX   STACK_TOP
  35#endif /* __KERNEL__ */
  36
  37struct task_struct;
  38
  39#ifdef __KERNEL__
  40struct fpq {
  41        unsigned long *insn_addr;
  42        unsigned long insn;
  43};
  44#endif
  45
  46typedef struct {
  47        int seg;
  48} mm_segment_t;
  49
  50/* The Sparc processor specific thread struct. */
  51struct thread_struct {
  52        struct pt_regs *kregs;
  53        unsigned int _pad1;
  54
  55        /* Special child fork kpsr/kwim values. */
  56        unsigned long fork_kpsr __attribute__ ((aligned (8)));
  57        unsigned long fork_kwim;
  58
  59        /* Floating point regs */
  60        unsigned long   float_regs[32] __attribute__ ((aligned (8)));
  61        unsigned long   fsr;
  62        unsigned long   fpqdepth;
  63        struct fpq      fpqueue[16];
  64        unsigned long flags;
  65        mm_segment_t current_ds;
  66};
  67
  68#define SPARC_FLAG_KTHREAD      0x1    /* task is a kernel thread */
  69#define SPARC_FLAG_UNALIGNED    0x2    /* is allowed to do unaligned accesses */
  70
  71#define INIT_THREAD  { \
  72        .flags = SPARC_FLAG_KTHREAD, \
  73        .current_ds = KERNEL_DS, \
  74}
  75
  76/* Return saved PC of a blocked thread. */
  77unsigned long thread_saved_pc(struct task_struct *t);
  78
  79/* Do necessary setup to start up a newly executed thread. */
  80static inline void start_thread(struct pt_regs * regs, unsigned long pc,
  81                                    unsigned long sp)
  82{
  83        register unsigned long zero asm("g1");
  84
  85        regs->psr = (regs->psr & (PSR_CWP)) | PSR_S;
  86        regs->pc = ((pc & (~3)) - 4);
  87        regs->npc = regs->pc + 4;
  88        regs->y = 0;
  89        zero = 0;
  90        __asm__ __volatile__("std\t%%g0, [%0 + %3 + 0x00]\n\t"
  91                             "std\t%%g0, [%0 + %3 + 0x08]\n\t"
  92                             "std\t%%g0, [%0 + %3 + 0x10]\n\t"
  93                             "std\t%%g0, [%0 + %3 + 0x18]\n\t"
  94                             "std\t%%g0, [%0 + %3 + 0x20]\n\t"
  95                             "std\t%%g0, [%0 + %3 + 0x28]\n\t"
  96                             "std\t%%g0, [%0 + %3 + 0x30]\n\t"
  97                             "st\t%1, [%0 + %3 + 0x38]\n\t"
  98                             "st\t%%g0, [%0 + %3 + 0x3c]"
  99                             : /* no outputs */
 100                             : "r" (regs),
 101                               "r" (sp - sizeof(struct reg_window32)),
 102                               "r" (zero),
 103                               "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))
 104                             : "memory");
 105}
 106
 107/* Free all resources held by a thread. */
 108#define release_thread(tsk)             do { } while(0)
 109
 110unsigned long get_wchan(struct task_struct *);
 111
 112#define task_pt_regs(tsk) ((tsk)->thread.kregs)
 113#define KSTK_EIP(tsk)  ((tsk)->thread.kregs->pc)
 114#define KSTK_ESP(tsk)  ((tsk)->thread.kregs->u_regs[UREG_FP])
 115
 116#ifdef __KERNEL__
 117
 118extern struct task_struct *last_task_used_math;
 119int do_mathemu(struct pt_regs *regs, struct task_struct *fpt);
 120
 121#define cpu_relax()     barrier()
 122#define cpu_relax_lowlatency() cpu_relax()
 123
 124extern void (*sparc_idle)(void);
 125
 126#endif
 127
 128#endif /* __ASM_SPARC_PROCESSOR_H */
 129