include/asm-sparc/processor.h

   1 /* $Id: processor.h,v 1.83 2001/10/08 09:32:13 davem Exp $
   2  * include/asm-sparc/processor.h
   3  *
   4  * Copyright (C) 1994 David S. Miller (davem@caip.rutgers.edu)
   5  */
   6
   7 #ifndef __ASM_SPARC_PROCESSOR_H
   8 #define __ASM_SPARC_PROCESSOR_H
   9
  10 /*
  11  * Sparc32 implementation of macro that returns current
  12  * instruction pointer ("program counter").
  13  */
  14 #define current_text_addr() ({ void *pc; __asm__("sethi %%hi(1f), %0; or %0, %%lo(1f), %0;\n1:" : "=r" (pc)); pc; })
  15
  16 #include <asm/psr.h>
  17 #include <asm/ptrace.h>
  18 #include <asm/head.h>
  19 #include <asm/signal.h>
  20 #include <asm/btfixup.h>
  21 #include <asm/page.h>
  22
  23 /*
  24  * The sparc has no problems with write protection
  25  */
  26 #define wp_works_ok 1
  27 #define wp_works_ok__is_a_macro /* for versions in ksyms.c */
  28
  29 /* Whee, this is STACK_TOP + PAGE_SIZE and the lowest kernel address too...
  30  * That one page is used to protect kernel from intruders, so that
  31  * we can make our access_ok test faster
  32  */
  33 #define TASK_SIZE       PAGE_OFFSET
  34 #ifdef __KERNEL__
  35 #define STACK_TOP       (PAGE_OFFSET - PAGE_SIZE)
  36 #define STACK_TOP_MAX   STACK_TOP
  37 #endif /* __KERNEL__ */
  38
  39 struct task_struct;
  40
  41 #ifdef __KERNEL__
  42 struct fpq {
  43         unsigned long *insn_addr;
  44         unsigned long insn;
  45 };
  46 #endif
  47
  48 typedef struct {
  49         int seg;
  50 } mm_segment_t;
  51
  52 /* The Sparc processor specific thread struct. */
  53 struct thread_struct {
  54         struct pt_regs *kregs;
  55         unsigned int _pad1;
  56
  57         /* Special child fork kpsr/kwim values. */
  58         unsigned long fork_kpsr __attribute__ ((aligned (8)));
  59         unsigned long fork_kwim;
  60
  61         /* Floating point regs */
  62         unsigned long   float_regs[32] __attribute__ ((aligned (8)));
  63         unsigned long   fsr;
  64         unsigned long   fpqdepth;
  65         struct fpq      fpqueue[16];
  66         unsigned long flags;
  67         mm_segment_t current_ds;
  68         int new_signal;
  69 };
  70
  71 #define SPARC_FLAG_KTHREAD      0x1    /* task is a kernel thread */
  72 #define SPARC_FLAG_UNALIGNED    0x2    /* is allowed to do unaligned accesses */
  73
  74 #define INIT_THREAD  { \
  75         .flags = SPARC_FLAG_KTHREAD, \
  76         .current_ds = KERNEL_DS, \
  77 }
  78
  79 /* Return saved PC of a blocked thread. */
  80 extern unsigned long thread_saved_pc(struct task_struct *t);
  81
  82 /* Do necessary setup to start up a newly executed thread. */
  83 static inline void start_thread(struct pt_regs * regs, unsigned long pc,
  84                                     unsigned long sp)
  85 {
  86         register unsigned long zero asm("g1");
  87
  88         regs->psr = (regs->psr & (PSR_CWP)) | PSR_S;
  89         regs->pc = ((pc & (~3)) - 4);
  90         regs->npc = regs->pc + 4;
  91         regs->y = 0;
  92         zero = 0;
  93         __asm__ __volatile__("std\t%%g0, [%0 + %3 + 0x00]\n\t"
  94                              "std\t%%g0, [%0 + %3 + 0x08]\n\t"
  95                              "std\t%%g0, [%0 + %3 + 0x10]\n\t"
  96                              "std\t%%g0, [%0 + %3 + 0x18]\n\t"
  97                              "std\t%%g0, [%0 + %3 + 0x20]\n\t"
  98                              "std\t%%g0, [%0 + %3 + 0x28]\n\t"
  99                              "std\t%%g0, [%0 + %3 + 0x30]\n\t"
 100                              "st\t%1, [%0 + %3 + 0x38]\n\t"
 101                              "st\t%%g0, [%0 + %3 + 0x3c]"
 102                              : /* no outputs */
 103                              : "r" (regs),
 104                                "r" (sp - sizeof(struct reg_window)),
 105                                "r" (zero),
 106                                "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))
 107                              : "memory");
 108 }
 109
 110 /* Free all resources held by a thread. */
 111 #define release_thread(tsk)             do { } while(0)
 112 extern pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 113
 114 /* Prepare to copy thread state - unlazy all lazy status */
 115 #define prepare_to_copy(tsk)    do { } while (0)
 116
 117 extern unsigned long get_wchan(struct task_struct *);
 118
 119 #define KSTK_EIP(tsk)  ((tsk)->thread.kregs->pc)
 120 #define KSTK_ESP(tsk)  ((tsk)->thread.kregs->u_regs[UREG_FP])
 121
 122 #ifdef __KERNEL__
 123
 124 extern struct task_struct *last_task_used_math;
 125
 126 #define cpu_relax()     barrier()
 127
 128 #endif
 129
 130 #endif /* __ASM_SPARC_PROCESSOR_H */