include/asm-sparc/processor.h

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