LXR linux/arch/h8300/include/asm/processor.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * include/asm-h8300/processor.h
   4 *
   5 * Copyright (C) 2002 Yoshinori Sato
   6 *
   7 * Based on: linux/asm-m68nommu/processor.h
   8 *
   9 * Copyright (C) 1995 Hamish Macdonald
  10 */
  11
  12#ifndef __ASM_H8300_PROCESSOR_H
  13#define __ASM_H8300_PROCESSOR_H
  14
  15#include <linux/compiler.h>
  16#include <asm/segment.h>
  17#include <asm/ptrace.h>
  18#include <asm/current.h>
  19
  20static inline unsigned long rdusp(void)
  21{
  22        extern unsigned int     _sw_usp;
  23
  24        return _sw_usp;
  25}
  26
  27static inline void wrusp(unsigned long usp)
  28{
  29        extern unsigned int     _sw_usp;
  30
  31        _sw_usp = usp;
  32}
  33
  34/*
  35 * User space process size: 3.75GB. This is hardcoded into a few places,
  36 * so don't change it unless you know what you are doing.
  37 */
  38#define TASK_SIZE       (0xFFFFFFFFUL)
  39
  40#ifdef __KERNEL__
  41#define STACK_TOP       TASK_SIZE
  42#define STACK_TOP_MAX   STACK_TOP
  43#endif
  44
  45/*
  46 * This decides where the kernel will search for a free chunk of vm
  47 * space during mmap's. We won't be using it
  48 */
  49#define TASK_UNMAPPED_BASE      0
  50
  51struct thread_struct {
  52        unsigned long  ksp;             /* kernel stack pointer */
  53        unsigned long  usp;             /* user stack pointer */
  54        unsigned long  ccr;             /* saved status register */
  55        unsigned long  esp0;            /* points to SR of stack frame */
  56        struct {
  57                unsigned short *addr;
  58                unsigned short inst;
  59        } breakinfo;
  60};
  61
  62#define INIT_THREAD  {                                          \
  63        .ksp  = sizeof(init_stack) + (unsigned long)init_stack, \
  64        .usp  = 0,                                              \
  65        .ccr  = PS_S,                                           \
  66        .esp0 = 0,                                              \
  67        .breakinfo = {                                          \
  68                .addr = (unsigned short *)-1,                   \
  69                .inst = 0                                       \
  70        }                                                       \
  71}
  72
  73/*
  74 * Do necessary setup to start up a newly executed thread.
  75 *
  76 * pass the data segment into user programs if it exists,
  77 * it can't hurt anything as far as I can tell
  78 */
  79#if defined(CONFIG_CPU_H8300H)
  80#define start_thread(_regs, _pc, _usp)                          \
  81do {                                                            \
  82        (_regs)->pc = (_pc);                                    \
  83        (_regs)->ccr = 0x00;       /* clear all flags */        \
  84        (_regs)->er5 = current->mm->start_data; /* GOT base */  \
  85        (_regs)->sp = ((unsigned long)(_usp)) - sizeof(unsigned long) * 3; \
  86} while (0)
  87#endif
  88#if defined(CONFIG_CPU_H8S)
  89#define start_thread(_regs, _pc, _usp)                          \
  90do {                                                            \
  91        (_regs)->pc = (_pc);                                    \
  92        (_regs)->ccr = 0x00;       /* clear kernel flag */      \
  93        (_regs)->exr = 0x78;       /* enable all interrupts */  \
  94        (_regs)->er5 = current->mm->start_data; /* GOT base */  \
  95        /* 14 = space for retaddr(4), vector(4), er0(4) and exr(2) on stack */ \
  96        (_regs)->sp = ((unsigned long)(_usp)) - 14;             \
  97} while (0)
  98#endif
  99
 100/* Forward declaration, a strange C thing */
 101struct task_struct;
 102
 103/* Free all resources held by a thread. */
 104static inline void release_thread(struct task_struct *dead_task)
 105{
 106}
 107
 108unsigned long get_wchan(struct task_struct *p);
 109
 110#define KSTK_EIP(tsk)   \
 111        ({                       \
 112                unsigned long eip = 0;        \
 113                if ((tsk)->thread.esp0 > PAGE_SIZE &&   \
 114                    MAP_NR((tsk)->thread.esp0) < max_mapnr)      \
 115                        eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \
 116                eip; })
 117
 118#define KSTK_ESP(tsk)   ((tsk) == current ? rdusp() : (tsk)->thread.usp)
 119
 120#define cpu_relax()    barrier()
 121
 122#define HARD_RESET_NOW() ({             \
 123        local_irq_disable();            \
 124        asm("jmp @@0");                 \
 125})
 126
 127#endif
 128