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 <arch/processor.h> 17 18 struct task_struct; 19 20 #define STACK_TOP TASK_SIZE 21 #define STACK_TOP_MAX STACK_TOP 22 23 /* This decides where the kernel will search for a free chunk of vm 24 * space during mmap's. 25 */ 26 #define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 3)) 27 28 /* THREAD_SIZE is the size of the task_struct/kernel_stack combo. 29 * normally, the stack is found by doing something like p + THREAD_SIZE 30 * in CRIS, a page is 8192 bytes, which seems like a sane size 31 */ 32 33 #define THREAD_SIZE PAGE_SIZE 34 #define KERNEL_STACK_SIZE PAGE_SIZE 35 36 /* 37 * At user->kernel entry, the pt_regs struct is stacked on the top of the kernel-stack. 38 * This macro allows us to find those regs for a task. 39 * Notice that subsequent pt_regs stackings, like recursive interrupts occurring while 40 * we're in the kernel, won't affect this - only the first user->kernel transition 41 * registers are reached by this. 42 */ 43 44 #define user_regs(thread_info) (((struct pt_regs *)((unsigned long)(thread_info) + THREAD_SIZE)) - 1) 45 46 /* 47 * Dito but for the currently running task 48 */ 49 50 #define task_pt_regs(task) user_regs(task_thread_info(task)) 51 #define current_regs() task_pt_regs(current) 52 prepare_to_copy(struct task_struct * tsk)53static inline void prepare_to_copy(struct task_struct *tsk) 54 { 55 } 56 57 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); 58 59 unsigned long get_wchan(struct task_struct *p); 60 61 #define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp) 62 63 extern unsigned long thread_saved_pc(struct task_struct *tsk); 64 65 /* Free all resources held by a thread. */ release_thread(struct task_struct * dead_task)66static inline void release_thread(struct task_struct *dead_task) 67 { 68 /* Nothing needs to be done. */ 69 } 70 71 #define init_stack (init_thread_union.stack) 72 73 #define cpu_relax() barrier() 74 75 #endif /* __ASM_CRIS_PROCESSOR_H */ 76