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127 lines
3.0 KiB
127 lines
3.0 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* include/asm-h8300/processor.h |
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* |
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* Copyright (C) 2002 Yoshinori Sato |
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* |
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* Based on: linux/asm-m68nommu/processor.h |
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* |
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* Copyright (C) 1995 Hamish Macdonald |
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*/ |
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#ifndef __ASM_H8300_PROCESSOR_H |
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#define __ASM_H8300_PROCESSOR_H |
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#include <linux/compiler.h> |
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#include <asm/segment.h> |
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#include <asm/ptrace.h> |
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#include <asm/current.h> |
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static inline unsigned long rdusp(void) |
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{ |
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extern unsigned int _sw_usp; |
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return _sw_usp; |
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} |
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static inline void wrusp(unsigned long usp) |
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{ |
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extern unsigned int _sw_usp; |
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_sw_usp = usp; |
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} |
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/* |
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* User space process size: 3.75GB. This is hardcoded into a few places, |
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* so don't change it unless you know what you are doing. |
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*/ |
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#define TASK_SIZE (0xFFFFFFFFUL) |
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#ifdef __KERNEL__ |
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#define STACK_TOP TASK_SIZE |
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#define STACK_TOP_MAX STACK_TOP |
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#endif |
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/* |
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* This decides where the kernel will search for a free chunk of vm |
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* space during mmap's. We won't be using it |
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*/ |
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#define TASK_UNMAPPED_BASE 0 |
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struct thread_struct { |
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unsigned long ksp; /* kernel stack pointer */ |
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unsigned long usp; /* user stack pointer */ |
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unsigned long ccr; /* saved status register */ |
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unsigned long esp0; /* points to SR of stack frame */ |
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struct { |
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unsigned short *addr; |
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unsigned short inst; |
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} breakinfo; |
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}; |
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#define INIT_THREAD { \ |
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.ksp = sizeof(init_stack) + (unsigned long)init_stack, \ |
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.usp = 0, \ |
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.ccr = PS_S, \ |
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.esp0 = 0, \ |
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.breakinfo = { \ |
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.addr = (unsigned short *)-1, \ |
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.inst = 0 \ |
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} \ |
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} |
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/* |
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* Do necessary setup to start up a newly executed thread. |
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* |
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* pass the data segment into user programs if it exists, |
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* it can't hurt anything as far as I can tell |
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*/ |
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#if defined(CONFIG_CPU_H8300H) |
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#define start_thread(_regs, _pc, _usp) \ |
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do { \ |
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(_regs)->pc = (_pc); \ |
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(_regs)->ccr = 0x00; /* clear all flags */ \ |
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(_regs)->er5 = current->mm->start_data; /* GOT base */ \ |
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(_regs)->sp = ((unsigned long)(_usp)) - sizeof(unsigned long) * 3; \ |
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} while (0) |
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#endif |
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#if defined(CONFIG_CPU_H8S) |
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#define start_thread(_regs, _pc, _usp) \ |
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do { \ |
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(_regs)->pc = (_pc); \ |
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(_regs)->ccr = 0x00; /* clear kernel flag */ \ |
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(_regs)->exr = 0x78; /* enable all interrupts */ \ |
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(_regs)->er5 = current->mm->start_data; /* GOT base */ \ |
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/* 14 = space for retaddr(4), vector(4), er0(4) and exr(2) on stack */ \ |
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(_regs)->sp = ((unsigned long)(_usp)) - 14; \ |
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} while (0) |
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#endif |
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/* Forward declaration, a strange C thing */ |
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struct task_struct; |
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/* Free all resources held by a thread. */ |
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static inline void release_thread(struct task_struct *dead_task) |
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{ |
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} |
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unsigned long get_wchan(struct task_struct *p); |
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#define KSTK_EIP(tsk) \ |
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({ \ |
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unsigned long eip = 0; \ |
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if ((tsk)->thread.esp0 > PAGE_SIZE && \ |
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MAP_NR((tsk)->thread.esp0) < max_mapnr) \ |
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eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \ |
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eip; }) |
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#define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp) |
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#define cpu_relax() barrier() |
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#define HARD_RESET_NOW() ({ \ |
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local_irq_disable(); \ |
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asm("jmp @@0"); \ |
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}) |
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#endif
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