arch/sparc/include/asm/processor_32.h

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