LXR linux/arch/h8300/include/asm/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/compiler.h>
  21#include <asm/segment.h>
  22#include <asm/ptrace.h>
  23#include <asm/current.h>
  24
  25static inline unsigned long rdusp(void)
  26{
  27        extern unsigned int     _sw_usp;
  28
  29        return _sw_usp;
  30}
  31
  32static inline void wrusp(unsigned long usp)
  33{
  34        extern unsigned int     _sw_usp;
  35
  36        _sw_usp = usp;
  37}
  38
  39/*
  40 * User space process size: 3.75GB. This is hardcoded into a few places,
  41 * so don't change it unless you know what you are doing.
  42 */
  43#define TASK_SIZE       (0xFFFFFFFFUL)
  44
  45#ifdef __KERNEL__
  46#define STACK_TOP       TASK_SIZE
  47#define STACK_TOP_MAX   STACK_TOP
  48#endif
  49
  50/*
  51 * This decides where the kernel will search for a free chunk of vm
  52 * space during mmap's. We won't be using it
  53 */
  54#define TASK_UNMAPPED_BASE      0
  55
  56struct thread_struct {
  57        unsigned long  ksp;             /* kernel stack pointer */
  58        unsigned long  usp;             /* user stack pointer */
  59        unsigned long  ccr;             /* saved status register */
  60        unsigned long  esp0;            /* points to SR of stack frame */
  61        struct {
  62                unsigned short *addr;
  63                unsigned short inst;
  64        } breakinfo;
  65};
  66
  67#define INIT_THREAD  {                                          \
  68        .ksp  = sizeof(init_stack) + (unsigned long)init_stack, \
  69        .usp  = 0,                                              \
  70        .ccr  = PS_S,                                           \
  71        .esp0 = 0,                                              \
  72        .breakinfo = {                                          \
  73                .addr = (unsigned short *)-1,                   \
  74                .inst = 0                                       \
  75        }                                                       \
  76}
  77
  78/*
  79 * Do necessary setup to start up a newly executed thread.
  80 *
  81 * pass the data segment into user programs if it exists,
  82 * it can't hurt anything as far as I can tell
  83 */
  84#if defined(CONFIG_CPU_H8300H)
  85#define start_thread(_regs, _pc, _usp)                          \
  86do {                                                            \
  87        (_regs)->pc = (_pc);                                    \
  88        (_regs)->ccr = 0x00;       /* clear all flags */        \
  89        (_regs)->er5 = current->mm->start_data; /* GOT base */  \
  90        (_regs)->sp = ((unsigned long)(_usp)) - sizeof(unsigned long) * 3; \
  91} while (0)
  92#endif
  93#if defined(CONFIG_CPU_H8S)
  94#define start_thread(_regs, _pc, _usp)                          \
  95do {                                                            \
  96        (_regs)->pc = (_pc);                                    \
  97        (_regs)->ccr = 0x00;       /* clear kernel flag */      \
  98        (_regs)->exr = 0x78;       /* enable all interrupts */  \
  99        (_regs)->er5 = current->mm->start_data; /* GOT base */  \
 100        /* 14 = space for retaddr(4), vector(4), er0(4) and exr(2) on stack */ \
 101        (_regs)->sp = ((unsigned long)(_usp)) - 14;             \
 102} while (0)
 103#endif
 104
 105/* Forward declaration, a strange C thing */
 106struct task_struct;
 107
 108/* Free all resources held by a thread. */
 109static inline void release_thread(struct task_struct *dead_task)
 110{
 111}
 112
 113/*
 114 * Return saved PC of a blocked thread.
 115 */
 116unsigned long thread_saved_pc(struct task_struct *tsk);
 117unsigned long get_wchan(struct task_struct *p);
 118
 119#define KSTK_EIP(tsk)   \
 120        ({                       \
 121                unsigned long eip = 0;        \
 122                if ((tsk)->thread.esp0 > PAGE_SIZE &&   \
 123                    MAP_NR((tsk)->thread.esp0) < max_mapnr)      \
 124                        eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \
 125                eip; })
 126
 127#define KSTK_ESP(tsk)   ((tsk) == current ? rdusp() : (tsk)->thread.usp)
 128
 129#define cpu_relax()    barrier()
 130#define cpu_relax_lowlatency()  cpu_relax()
 131
 132#define HARD_RESET_NOW() ({             \
 133        local_irq_disable();            \
 134        asm("jmp @@0");                 \
 135})
 136
 137#endif
 138