include/asm-sparc/processor.h

   1 /* $Id: processor.h,v 1.70 1999/03/24 11:42:44 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  * Default implementation of macro that returns current
  12  * instruction pointer ("program counter").
  13  */
  14 #define current_text_addr() ({ __label__ _l; _l: &&_l;})
  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 EISA_bus 0
  30 #define EISA_bus__is_a_macro /* for versions in ksyms.c */
  31 #define MCA_bus 0
  32 #define MCA_bus__is_a_macro /* for versions in ksyms.c */
  33
  34 /*
  35  * The sparc has no problems with write protection
  36  */
  37 #define wp_works_ok 1
  38 #define wp_works_ok__is_a_macro /* for versions in ksyms.c */
  39
  40 /* Whee, this is STACK_TOP + PAGE_SIZE and the lowest kernel address too...
  41  * That one page is used to protect kernel from intruders, so that
  42  * we can make our access_ok test faster
  43  */
  44 #define TASK_SIZE       PAGE_OFFSET
  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         unsigned long uwinmask __attribute__ ((aligned (8)));
  58         struct pt_regs *kregs;
  59
  60         /* For signal handling */
  61         unsigned long sig_address __attribute__ ((aligned (8)));
  62         unsigned long sig_desc;
  63
  64         /* Context switch saved kernel state. */
  65         unsigned long ksp __attribute__ ((aligned (8)));
  66         unsigned long kpc;
  67         unsigned long kpsr;
  68         unsigned long kwim;
  69
  70         /* Special child fork kpsr/kwim values. */
  71         unsigned long fork_kpsr __attribute__ ((aligned (8)));
  72         unsigned long fork_kwim;
  73
  74         /* A place to store user windows and stack pointers
  75          * when the stack needs inspection.
  76          */
  77 #define NSWINS 8
  78         struct reg_window reg_window[NSWINS] __attribute__ ((aligned (8)));
  79         unsigned long rwbuf_stkptrs[NSWINS] __attribute__ ((aligned (8)));
  80         unsigned long w_saved;
  81
  82         /* Floating point regs */
  83         unsigned long   float_regs[32] __attribute__ ((aligned (8)));
  84         unsigned long   fsr;
  85         unsigned long   fpqdepth;
  86         struct fpq      fpqueue[16];
  87         unsigned long flags;
  88         mm_segment_t current_ds;
  89         struct exec core_exec;     /* just what it says. */
  90         int new_signal;
  91 };
  92
  93 #define SPARC_FLAG_KTHREAD      0x1    /* task is a kernel thread */
  94 #define SPARC_FLAG_UNALIGNED    0x2    /* is allowed to do unaligned accesses */
  95
  96 #define INIT_MMAP { &init_mm, (0), (0), \
  97                     NULL, __pgprot(0x0) , VM_READ | VM_WRITE | VM_EXEC, 1, NULL, NULL }
  98
  99 #define INIT_TSS  { \
 100 /* uwinmask, kregs, sig_address, sig_desc, ksp, kpc, kpsr, kwim */ \
 101    0,        0,     0,           0,        0,   0,   0,    0, \
 102 /* fork_kpsr, fork_kwim */ \
 103    0,         0, \
 104 /* reg_window */  \
 105 { { { 0, }, { 0, } }, }, \
 106 /* rwbuf_stkptrs */  \
 107 { 0, 0, 0, 0, 0, 0, 0, 0, }, \
 108 /* w_saved */ \
 109    0, \
 110 /* FPU regs */   { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
 111                    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, \
 112 /* FPU status, FPU qdepth, FPU queue */ \
 113    0,          0,  { { 0, 0, }, }, \
 114 /* flags,              current_ds, */ \
 115    SPARC_FLAG_KTHREAD, KERNEL_DS, \
 116 /* core_exec */ \
 117 { 0, }, \
 118 /* new_signal */ \
 119   0, \
 120 }
 121
 122 /* Return saved PC of a blocked thread. */
 123 extern __inline__ unsigned long thread_saved_pc(struct thread_struct *t)
 124 {
 125         return t->kpc;
 126 }
 127
 128 /* Do necessary setup to start up a newly executed thread. */
 129 extern __inline__ void start_thread(struct pt_regs * regs, unsigned long pc,
 130                                     unsigned long sp)
 131 {
 132         register unsigned long zero asm("g1");
 133
 134         regs->psr = (regs->psr & (PSR_CWP)) | PSR_S;
 135         regs->pc = ((pc & (~3)) - 4);
 136         regs->npc = regs->pc + 4;
 137         regs->y = 0;
 138         zero = 0;
 139         __asm__ __volatile__("std\t%%g0, [%0 + %3 + 0x00]\n\t"
 140                              "std\t%%g0, [%0 + %3 + 0x08]\n\t"
 141                              "std\t%%g0, [%0 + %3 + 0x10]\n\t"
 142                              "std\t%%g0, [%0 + %3 + 0x18]\n\t"
 143                              "std\t%%g0, [%0 + %3 + 0x20]\n\t"
 144                              "std\t%%g0, [%0 + %3 + 0x28]\n\t"
 145                              "std\t%%g0, [%0 + %3 + 0x30]\n\t"
 146                              "st\t%1, [%0 + %3 + 0x38]\n\t"
 147                              "st\t%%g0, [%0 + %3 + 0x3c]"
 148                              : : "r" (regs), "r" (sp - REGWIN_SZ), "r" (zero),
 149                              "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0])));
 150 }
 151
 152 /* Free all resources held by a thread. */
 153 #define release_thread(tsk)             do { } while(0)
 154 extern pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 155
 156
 157 #define copy_segments(__nr, __tsk, __mm)        \
 158         if((__tsk) == current &&                \
 159            (__mm) != NULL)                      \
 160                 flush_user_windows()
 161 #define release_segments(mm)            do { } while (0)
 162 #define forget_segments()               do { } while (0)
 163
 164 #ifdef __KERNEL__
 165
 166 extern struct task_struct *last_task_used_math;
 167
 168 /* Allocation and freeing of basic task resources. */
 169 BTFIXUPDEF_CALL(struct task_struct *, alloc_task_struct, void)
 170 BTFIXUPDEF_CALL(void, free_task_struct, struct task_struct *)
 171
 172 #define alloc_task_struct() BTFIXUP_CALL(alloc_task_struct)()
 173 #define free_task_struct(tsk) BTFIXUP_CALL(free_task_struct)(tsk)
 174
 175 #define init_task       (init_task_union.task)
 176 #define init_stack      (init_task_union.stack)
 177
 178 #endif
 179
 180 #endif /* __ASM_SPARC_PROCESSOR_H */