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