processor.h
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/*
* include/asm-h8300/processor.h
*
* Copyright (C) 2002 Yoshinori Sato
*
* Based on: linux/asm-m68nommu/processor.h
*
* Copyright (C) 1995 Hamish Macdonald
*/
#ifndef __ASM_H8300_PROCESSOR_H
#define __ASM_H8300_PROCESSOR_H
/*
* Default implementation of macro that returns current
* instruction pointer ("program counter").
*/
#define current_text_addr() ({ __label__ _l; _l: &&_l; })
#include <linux/compiler.h>
#include <asm/segment.h>
#include <asm/ptrace.h>
#include <asm/current.h>
static inline unsigned long rdusp(void)
{
extern unsigned int _sw_usp;
return _sw_usp;
}
static inline void wrusp(unsigned long usp)
{
extern unsigned int _sw_usp;
_sw_usp = usp;
}
/*
* User space process size: 3.75GB. This is hardcoded into a few places,
* so don't change it unless you know what you are doing.
*/
#define TASK_SIZE (0xFFFFFFFFUL)
#ifdef __KERNEL__
#define STACK_TOP TASK_SIZE
#define STACK_TOP_MAX STACK_TOP
#endif
/*
* This decides where the kernel will search for a free chunk of vm
* space during mmap's. We won't be using it
*/
#define TASK_UNMAPPED_BASE 0
struct thread_struct {
unsigned long ksp; /* kernel stack pointer */
unsigned long usp; /* user stack pointer */
unsigned long ccr; /* saved status register */
unsigned long esp0; /* points to SR of stack frame */
struct {
unsigned short *addr;
unsigned short inst;
} breakinfo;
};
#define INIT_THREAD { \
.ksp = sizeof(init_stack) + (unsigned long)init_stack, \
.usp = 0, \
.ccr = PS_S, \
.esp0 = 0, \
.breakinfo = { \
.addr = (unsigned short *)-1, \
.inst = 0 \
} \
}
/*
* Do necessary setup to start up a newly executed thread.
*
* pass the data segment into user programs if it exists,
* it can't hurt anything as far as I can tell
*/
#if defined(CONFIG_CPU_H8300H)
#define start_thread(_regs, _pc, _usp) \
do { \
(_regs)->pc = (_pc); \
(_regs)->ccr = 0x00; /* clear all flags */ \
(_regs)->er5 = current->mm->start_data; /* GOT base */ \
(_regs)->sp = ((unsigned long)(_usp)) - sizeof(unsigned long) * 3; \
} while (0)
#endif
#if defined(CONFIG_CPU_H8S)
#define start_thread(_regs, _pc, _usp) \
do { \
(_regs)->pc = (_pc); \
(_regs)->ccr = 0x00; /* clear kernel flag */ \
(_regs)->exr = 0x78; /* enable all interrupts */ \
(_regs)->er5 = current->mm->start_data; /* GOT base */ \
/* 14 = space for retaddr(4), vector(4), er0(4) and exr(2) on stack */ \
(_regs)->sp = ((unsigned long)(_usp)) - 14; \
} while (0)
#endif
/* Forward declaration, a strange C thing */
struct task_struct;
/* Free all resources held by a thread. */
static inline void release_thread(struct task_struct *dead_task)
{
}
/*
* Free current thread data structures etc..
*/
static inline void exit_thread(void)
{
}
/*
* Return saved PC of a blocked thread.
*/
unsigned long thread_saved_pc(struct task_struct *tsk);
unsigned long get_wchan(struct task_struct *p);
#define KSTK_EIP(tsk) \
({ \
unsigned long eip = 0; \
if ((tsk)->thread.esp0 > PAGE_SIZE && \
MAP_NR((tsk)->thread.esp0) < max_mapnr) \
eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \
eip; })
#define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp)
#define cpu_relax() barrier()
#define cpu_relax_lowlatency() cpu_relax()
#define HARD_RESET_NOW() ({ \
local_irq_disable(); \
asm("jmp @@0"); \
})
#endif