Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/*
2 * OpenRISC Linux
3 *
4 * Linux architectural port borrowing liberally from similar works of
5 * others. All original copyrights apply as per the original source
6 * declaration.
7 *
8 * OpenRISC implementation:
9 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
10 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
11 * et al.
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 */
18
19#ifndef __ASM_OPENRISC_PROCESSOR_H
20#define __ASM_OPENRISC_PROCESSOR_H
21
22#include <asm/spr_defs.h>
23#include <asm/page.h>
24#include <asm/ptrace.h>
25
26#define STACK_TOP TASK_SIZE
27#define STACK_TOP_MAX STACK_TOP
28/* Kernel and user SR register setting */
29#define KERNEL_SR (SPR_SR_DME | SPR_SR_IME | SPR_SR_ICE \
30 | SPR_SR_DCE | SPR_SR_SM)
31#define USER_SR (SPR_SR_DME | SPR_SR_IME | SPR_SR_ICE \
32 | SPR_SR_DCE | SPR_SR_IEE | SPR_SR_TEE)
33
34/*
35 * User space process size. This is hardcoded into a few places,
36 * so don't change it unless you know what you are doing.
37 */
38
39#define TASK_SIZE (0x80000000UL)
40
41/* This decides where the kernel will search for a free chunk of vm
42 * space during mmap's.
43 */
44#define TASK_UNMAPPED_BASE (TASK_SIZE / 8 * 3)
45
46#ifndef __ASSEMBLY__
47
48struct task_struct;
49
50struct thread_struct {
51};
52
53/*
54 * At user->kernel entry, the pt_regs struct is stacked on the top of the
55 * kernel-stack. This macro allows us to find those regs for a task.
56 * Notice that subsequent pt_regs stackings, like recursive interrupts
57 * occurring while we're in the kernel, won't affect this - only the first
58 * user->kernel transition registers are reached by this (i.e. not regs
59 * for running signal handler)
60 */
61#define user_regs(thread_info) (((struct pt_regs *)((unsigned long)(thread_info) + THREAD_SIZE - STACK_FRAME_OVERHEAD)) - 1)
62
63/*
64 * Dito but for the currently running task
65 */
66
67#define task_pt_regs(task) user_regs(task_thread_info(task))
68
69#define INIT_SP (sizeof(init_stack) + (unsigned long) &init_stack)
70
71#define INIT_THREAD { }
72
73
74#define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)
75#define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp)
76
77
78void start_thread(struct pt_regs *regs, unsigned long nip, unsigned long sp);
79void release_thread(struct task_struct *);
80unsigned long get_wchan(struct task_struct *p);
81
82#define cpu_relax() barrier()
83
84#endif /* __ASSEMBLY__ */
85#endif /* __ASM_OPENRISC_PROCESSOR_H */