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 <linux/a.out.h>
  17
  18 #include <asm/psr.h>
  19 #include <asm/ptrace.h>
  20 #include <asm/head.h>
  21 #include <asm/signal.h>
  22 #include <asm/segment.h>
  23 #include <asm/btfixup.h>
  24 #include <asm/page.h>
  25
  26 /*
  27  * Bus types
  28  */
  29 #define MCA_bus 0
  30 #define MCA_bus__is_a_macro /* for versions in ksyms.c */
  31
  32 /*
  33  * The sparc has no problems with write protection
  34  */
  35 #define wp_works_ok 1
  36 #define wp_works_ok__is_a_macro /* for versions in ksyms.c */
  37
  38 /* Whee, this is STACK_TOP + PAGE_SIZE and the lowest kernel address too...
  39  * That one page is used to protect kernel from intruders, so that
  40  * we can make our access_ok test faster
  41  */
  42 #define TASK_SIZE       PAGE_OFFSET
  43
  44 struct task_struct;
  45
  46 struct fpq {
  47         unsigned long *insn_addr;
  48         unsigned long insn;
  49 };
  50
  51 typedef struct {
  52         int seg;
  53 } mm_segment_t;
  54
  55 /* The Sparc processor specific thread struct. */
  56 struct thread_struct {
  57         struct pt_regs *kregs;
  58         unsigned int _pad1;
  59
  60         /* Special child fork kpsr/kwim values. */
  61         unsigned long fork_kpsr __attribute__ ((aligned (8)));
  62         unsigned long fork_kwim;
  63
  64         /* Floating point regs */
  65         unsigned long   float_regs[32] __attribute__ ((aligned (8)));
  66         unsigned long   fsr;
  67         unsigned long   fpqdepth;
  68         struct fpq      fpqueue[16];
  69         unsigned long flags;
  70         mm_segment_t current_ds;
  71         struct exec core_exec;     /* just what it says. */
  72         int new_signal;
  73 };
  74
  75 #define SPARC_FLAG_KTHREAD      0x1    /* task is a kernel thread */
  76 #define SPARC_FLAG_UNALIGNED    0x2    /* is allowed to do unaligned accesses */
  77
  78 #define INIT_THREAD  { \
  79         .flags = SPARC_FLAG_KTHREAD, \
  80         .current_ds = KERNEL_DS, \
  81 }
  82
  83 /* Return saved PC of a blocked thread. */
  84 extern unsigned long thread_saved_pc(struct task_struct *t);
  85
  86 /* Do necessary setup to start up a newly executed thread. */
  87 extern __inline__ void start_thread(struct pt_regs * regs, unsigned long pc,
  88                                     unsigned long sp)
  89 {
  90         register unsigned long zero asm("g1");
  91
  92         regs->psr = (regs->psr & (PSR_CWP)) | PSR_S;
  93         regs->pc = ((pc & (~3)) - 4);
  94         regs->npc = regs->pc + 4;
  95         regs->y = 0;
  96         zero = 0;
  97         __asm__ __volatile__("std\t%%g0, [%0 + %3 + 0x00]\n\t"
  98                              "std\t%%g0, [%0 + %3 + 0x08]\n\t"
  99                              "std\t%%g0, [%0 + %3 + 0x10]\n\t"
 100                              "std\t%%g0, [%0 + %3 + 0x18]\n\t"
 101                              "std\t%%g0, [%0 + %3 + 0x20]\n\t"
 102                              "std\t%%g0, [%0 + %3 + 0x28]\n\t"
 103                              "std\t%%g0, [%0 + %3 + 0x30]\n\t"
 104                              "st\t%1, [%0 + %3 + 0x38]\n\t"
 105                              "st\t%%g0, [%0 + %3 + 0x3c]"
 106                              : /* no outputs */
 107                              : "r" (regs),
 108                                "r" (sp - sizeof(struct reg_window)),
 109                                "r" (zero),
 110                                "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))
 111                              : "memory");
 112 }
 113
 114 /* Free all resources held by a thread. */
 115 #define release_thread(tsk)             do { } while(0)
 116 extern pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 117
 118 /* Prepare to copy thread state - unlazy all lazy status */
 119 #define prepare_to_copy(tsk)    do { } while (0)
 120
 121 extern unsigned long get_wchan(struct task_struct *);
 122
 123 #define KSTK_EIP(tsk)  ((tsk)->thread.kregs->pc)
 124 #define KSTK_ESP(tsk)  ((tsk)->thread.kregs->u_regs[UREG_FP])
 125
 126 #ifdef __KERNEL__
 127
 128 extern struct task_struct *last_task_used_math;
 129
 130 #define cpu_relax()     barrier()
 131
 132 #endif
 133
 134 #endif /* __ASM_SPARC_PROCESSOR_H */