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