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/page.h>
14#include <asm/ptrace.h>
15#include <arch/processor.h>
16#include <arch/system.h>
17
18struct 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 thread_info/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#define THREAD_SIZE       PAGE_SIZE
33#define THREAD_SIZE_ORDER (0)
34
35/*
36 * At user->kernel entry, the pt_regs struct is stacked on the top of the kernel-stack.
37 * This macro allows us to find those regs for a task.
38 * Notice that subsequent pt_regs stackings, like recursive interrupts occurring while
39 * we're in the kernel, won't affect this - only the first user->kernel transition
40 * registers are reached by this.
41 */
42
43#define user_regs(thread_info) (((struct pt_regs *)((unsigned long)(thread_info) + THREAD_SIZE)) - 1)
44
45/*
46 * Dito but for the currently running task
47 */
48
49#define task_pt_regs(task) user_regs(task_thread_info(task))
50
51unsigned long get_wchan(struct task_struct *p);
52
53#define KSTK_ESP(tsk)   ((tsk) == current ? rdusp() : (tsk)->thread.usp)
54
55extern unsigned long thread_saved_pc(struct task_struct *tsk);
56
57/* Free all resources held by a thread. */
58static inline void release_thread(struct task_struct *dead_task)
59{
60        /* Nothing needs to be done.  */
61}
62
63#define init_stack      (init_thread_union.stack)
64
65#define cpu_relax()     barrier()
66#define cpu_relax_lowlatency() cpu_relax()
67
68void default_idle(void);
69
70#endif /* __ASM_CRIS_PROCESSOR_H */
71