include/asm-h8300/processor.h

   1 /*
   2  * include/asm-h8300/processor.h
   3  *
   4  * Copyright (C) 2002 Yoshinori Sato
   5  *
   6  * Based on: linux/asm-m68nommu/processor.h
   7  *
   8  * Copyright (C) 1995 Hamish Macdonald
   9  */
  10
  11 #ifndef __ASM_H8300_PROCESSOR_H
  12 #define __ASM_H8300_PROCESSOR_H
  13
  14 /*
  15  * Default implementation of macro that returns current
  16  * instruction pointer ("program counter").
  17  */
  18 #define current_text_addr() ({ __label__ _l; _l: &&_l;})
  19
  20 #include <linux/config.h>
  21 #include <asm/segment.h>
  22 #include <asm/fpu.h>
  23 #include <asm/ptrace.h>
  24 #include <asm/current.h>
  25
  26 extern inline unsigned long rdusp(void) {
  27         extern unsigned int     sw_usp;
  28         return(sw_usp);
  29 }
  30
  31 extern inline void wrusp(unsigned long usp) {
  32         extern unsigned int     sw_usp;
  33         sw_usp = usp;
  34 }
  35
  36 /*
  37  * User space process size: 3.75GB. This is hardcoded into a few places,
  38  * so don't change it unless you know what you are doing.
  39  */
  40 #define TASK_SIZE       (0xFFFFFFFFUL)
  41
  42 /*
  43  * This decides where the kernel will search for a free chunk of vm
  44  * space during mmap's. We won't be using it
  45  */
  46 #define TASK_UNMAPPED_BASE      0
  47
  48 /*
  49  * Bus types
  50  */
  51 #define EISA_bus 0
  52 #define MCA_bus 0
  53
  54 struct thread_struct {
  55         unsigned long  ksp;             /* kernel stack pointer */
  56         unsigned long  usp;             /* user stack pointer */
  57         unsigned short ccr;             /* saved status register */
  58         unsigned long  esp0;            /* points to SR of stack frame */
  59         unsigned long  vfork_ret;
  60         unsigned long  debugreg[8];     /* debug info */
  61 } __attribute__((aligned(2),packed));
  62
  63 #define INIT_THREAD  { \
  64         sizeof(init_stack) + (unsigned long) init_stack, 0, \
  65         PS_S,  0, 0, \
  66 }
  67
  68 /*
  69  * Do necessary setup to start up a newly executed thread.
  70  *
  71  * pass the data segment into user programs if it exists,
  72  * it can't hurt anything as far as I can tell
  73  */
  74 #define start_thread(_regs, _pc, _usp)                          \
  75 do {                                                            \
  76         (_regs)->pc = (_pc);                                    \
  77         (_regs)->ccr &= ~0x10;                                  \
  78         *((unsigned long *)(_usp)-1) = _pc;                     \
  79         wrusp((unsigned long)(_usp) - sizeof(unsigned long)*3); \
  80 } while(0)
  81
  82 /* Forward declaration, a strange C thing */
  83 struct task_struct;
  84
  85 /* Free all resources held by a thread. */
  86 static inline void release_thread(struct task_struct *dead_task)
  87 {
  88 }
  89
  90 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
  91
  92 #define prepare_to_copy(tsk)    do { } while (0)
  93
  94 /*
  95  * Free current thread data structures etc..
  96  */
  97 static inline void exit_thread(void)
  98 {
  99 }
 100
 101 /*
 102  * Return saved PC of a blocked thread.
 103  */
 104 unsigned long thread_saved_pc(struct task_struct *tsk);
 105 unsigned long get_wchan(struct task_struct *p);
 106
 107 #define KSTK_EIP(tsk)   \
 108     ({                  \
 109         unsigned long eip = 0;   \
 110         if ((tsk)->thread.esp0 > PAGE_SIZE && \
 111             MAP_NR((tsk)->thread.esp0) < max_mapnr) \
 112               eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \
 113         eip; })
 114 #define KSTK_ESP(tsk)   ((tsk) == current ? rdusp() : (tsk)->thread.usp)
 115
 116 #define cpu_relax()    do { } while (0)
 117
 118 #endif