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 #include <linux/a.out.h>
  11
  12 #include <asm/psr.h>
  13 #include <asm/ptrace.h>
  14 #include <asm/head.h>
  15 #include <asm/signal.h>
  16 #include <asm/segment.h>
  17 #include <asm/btfixup.h>
  18 #include <asm/page.h>
  19
  20 /*
  21  * Bus types
  22  */
  23 #define EISA_bus 0
  24 #define EISA_bus__is_a_macro /* for versions in ksyms.c */
  25 #define MCA_bus 0
  26 #define MCA_bus__is_a_macro /* for versions in ksyms.c */
  27
  28 /*
  29  * The sparc has no problems with write protection
  30  */
  31 #define wp_works_ok 1
  32 #define wp_works_ok__is_a_macro /* for versions in ksyms.c */
  33
  34 /* Whee, this is STACK_TOP + PAGE_SIZE and the lowest kernel address too...
  35  * That one page is used to protect kernel from intruders, so that
  36  * we can make our access_ok test faster
  37  */
  38 #define TASK_SIZE       PAGE_OFFSET
  39
  40 struct fpq {
  41         unsigned long *insn_addr;
  42         unsigned long insn;
  43 };
  44
  45 typedef struct {
  46         int seg;
  47 } mm_segment_t;
  48
  49 /* The Sparc processor specific thread struct. */
  50 struct thread_struct {
  51         unsigned long uwinmask __attribute__ ((aligned (8)));
  52         struct pt_regs *kregs;
  53
  54         /* For signal handling */
  55         unsigned long sig_address __attribute__ ((aligned (8)));
  56         unsigned long sig_desc;
  57
  58         /* Context switch saved kernel state. */
  59         unsigned long ksp __attribute__ ((aligned (8)));
  60         unsigned long kpc;
  61         unsigned long kpsr;
  62         unsigned long kwim;
  63
  64         /* Special child fork kpsr/kwim values. */
  65         unsigned long fork_kpsr __attribute__ ((aligned (8)));
  66         unsigned long fork_kwim;
  67
  68         /* A place to store user windows and stack pointers
  69          * when the stack needs inspection.
  70          */
  71 #define NSWINS 8
  72         struct reg_window reg_window[NSWINS] __attribute__ ((aligned (8)));
  73         unsigned long rwbuf_stkptrs[NSWINS] __attribute__ ((aligned (8)));
  74         unsigned long w_saved;
  75
  76         /* Floating point regs */
  77         unsigned long   float_regs[32] __attribute__ ((aligned (8)));
  78         unsigned long   fsr;
  79         unsigned long   fpqdepth;
  80         struct fpq      fpqueue[16];
  81         unsigned long flags;
  82         mm_segment_t current_ds;
  83         struct exec core_exec;     /* just what it says. */
  84         int new_signal;
  85 };
  86
  87 #define SPARC_FLAG_KTHREAD      0x1    /* task is a kernel thread */
  88 #define SPARC_FLAG_UNALIGNED    0x2    /* is allowed to do unaligned accesses */
  89
  90 #define INIT_MMAP { &init_mm, (0), (0), \
  91                     NULL, __pgprot(0x0) , VM_READ | VM_WRITE | VM_EXEC, 1, NULL, NULL }
  92
  93 #define INIT_TSS  { \
  94 /* uwinmask, kregs, sig_address, sig_desc, ksp, kpc, kpsr, kwim */ \
  95    0,        0,     0,           0,        0,   0,   0,    0, \
  96 /* fork_kpsr, fork_kwim */ \
  97    0,         0, \
  98 /* reg_window */  \
  99 { { { 0, }, { 0, } }, }, \
 100 /* rwbuf_stkptrs */  \
 101 { 0, 0, 0, 0, 0, 0, 0, 0, }, \
 102 /* w_saved */ \
 103    0, \
 104 /* FPU regs */   { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
 105                    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, \
 106 /* FPU status, FPU qdepth, FPU queue */ \
 107    0,          0,  { { 0, 0, }, }, \
 108 /* flags,              current_ds, */ \
 109    SPARC_FLAG_KTHREAD, KERNEL_DS, \
 110 /* core_exec */ \
 111 { 0, }, \
 112 /* new_signal */ \
 113   0, \
 114 }
 115
 116 /* Return saved PC of a blocked thread. */
 117 extern __inline__ unsigned long thread_saved_pc(struct thread_struct *t)
 118 {
 119         return t->kpc;
 120 }
 121
 122 /* Do necessary setup to start up a newly executed thread. */
 123 extern __inline__ void start_thread(struct pt_regs * regs, unsigned long pc,
 124                                     unsigned long sp)
 125 {
 126         register unsigned long zero asm("g1");
 127
 128         regs->psr = (regs->psr & (PSR_CWP)) | PSR_S;
 129         regs->pc = ((pc & (~3)) - 4);
 130         regs->npc = regs->pc + 4;
 131         regs->y = 0;
 132         zero = 0;
 133         __asm__ __volatile__("std\t%%g0, [%0 + %3 + 0x00]\n\t"
 134                              "std\t%%g0, [%0 + %3 + 0x08]\n\t"
 135                              "std\t%%g0, [%0 + %3 + 0x10]\n\t"
 136                              "std\t%%g0, [%0 + %3 + 0x18]\n\t"
 137                              "std\t%%g0, [%0 + %3 + 0x20]\n\t"
 138                              "std\t%%g0, [%0 + %3 + 0x28]\n\t"
 139                              "std\t%%g0, [%0 + %3 + 0x30]\n\t"
 140                              "st\t%1, [%0 + %3 + 0x38]\n\t"
 141                              "st\t%%g0, [%0 + %3 + 0x3c]"
 142                              : : "r" (regs), "r" (sp - REGWIN_SZ), "r" (zero),
 143                              "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0])));
 144 }
 145
 146 /* Free all resources held by a thread. */
 147 #define release_thread(tsk)             do { } while(0)
 148 extern pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 149
 150
 151 #define copy_segments(__nr, __tsk, __mm)        \
 152         if((__tsk) == current &&                \
 153            (__mm) != NULL)                      \
 154                 flush_user_windows()
 155 #define release_segments(mm)            do { } while (0)
 156 #define forget_segments()               do { } while (0)
 157
 158 #ifdef __KERNEL__
 159
 160 extern struct task_struct *last_task_used_math;
 161
 162 /* Allocation and freeing of basic task resources. */
 163 BTFIXUPDEF_CALL(struct task_struct *, alloc_task_struct, void)
 164 BTFIXUPDEF_CALL(void, free_task_struct, struct task_struct *)
 165
 166 #define alloc_task_struct() BTFIXUP_CALL(alloc_task_struct)()
 167 #define free_task_struct(tsk) BTFIXUP_CALL(free_task_struct)(tsk)
 168
 169 #define init_task       (init_task_union.task)
 170 #define init_stack      (init_task_union.stack)
 171
 172 #endif
 173
 174 #endif /* __ASM_SPARC_PROCESSOR_H */