1/* 2 * include/asm-cris/processor.h 3 * 4 * Copyright (C) 2000, 2001 Axis Communications AB 5 * 6 * Authors: Bjorn Wesen Initial version 7 * 8 */ 9 10#ifndef __ASM_CRIS_PROCESSOR_H 11#define __ASM_CRIS_PROCESSOR_H 12 13#include <asm/system.h> 14#include <asm/page.h> 15#include <asm/ptrace.h> 16#include <asm/arch/processor.h> 17 18struct task_struct; 19 20/* This decides where the kernel will search for a free chunk of vm 21 * space during mmap's. 22 */ 23#define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 3)) 24 25/* THREAD_SIZE is the size of the task_struct/kernel_stack combo. 26 * normally, the stack is found by doing something like p + THREAD_SIZE 27 * in CRIS, a page is 8192 bytes, which seems like a sane size 28 */ 29 30#define THREAD_SIZE PAGE_SIZE 31#define KERNEL_STACK_SIZE PAGE_SIZE 32 33/* 34 * At user->kernel entry, the pt_regs struct is stacked on the top of the kernel-stack. 35 * This macro allows us to find those regs for a task. 36 * Notice that subsequent pt_regs stackings, like recursive interrupts occurring while 37 * we're in the kernel, won't affect this - only the first user->kernel transition 38 * registers are reached by this. 39 */ 40 41#define user_regs(thread_info) (((struct pt_regs *)((unsigned long)(thread_info) + THREAD_SIZE)) - 1) 42 43/* 44 * Dito but for the currently running task 45 */ 46 47#define task_pt_regs(task) user_regs(task_thread_info(task)) 48#define current_regs() task_pt_regs(current) 49 50static inline void prepare_to_copy(struct task_struct *tsk) 51{ 52} 53 54extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); 55 56unsigned long get_wchan(struct task_struct *p); 57 58#define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp) 59 60extern unsigned long thread_saved_pc(struct task_struct *tsk); 61 62/* Free all resources held by a thread. */ 63static inline void release_thread(struct task_struct *dead_task) 64{ 65 /* Nothing needs to be done. */ 66} 67 68#define init_stack (init_thread_union.stack) 69 70#define cpu_relax() barrier() 71 72#endif /* __ASM_CRIS_PROCESSOR_H */ 73