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 * Default implementation of macro that returns current
 35 * instruction pointer ("program counter").
 36 */
 37#define current_text_addr() ({ __label__ _l; _l: &&_l; })
 38
 39/*
 40 * User space process size. This is hardcoded into a few places,
 41 * so don't change it unless you know what you are doing.
 42 */
 43
 44#define TASK_SIZE       (0x80000000UL)
 45
 46/* This decides where the kernel will search for a free chunk of vm
 47 * space during mmap's.
 48 */
 49#define TASK_UNMAPPED_BASE      (TASK_SIZE / 8 * 3)
 50
 51#ifndef __ASSEMBLY__
 52
 53struct task_struct;
 54
 55struct thread_struct {
 56};
 57
 58/*
 59 * At user->kernel entry, the pt_regs struct is stacked on the top of the
 60 * kernel-stack.  This macro allows us to find those regs for a task.
 61 * Notice that subsequent pt_regs stackings, like recursive interrupts
 62 * occurring while we're in the kernel, won't affect this - only the first
 63 * user->kernel transition registers are reached by this (i.e. not regs
 64 * for running signal handler)
 65 */
 66#define user_regs(thread_info)  (((struct pt_regs *)((unsigned long)(thread_info) + THREAD_SIZE - STACK_FRAME_OVERHEAD)) - 1)
 67
 68/*
 69 * Dito but for the currently running task
 70 */
 71
 72#define task_pt_regs(task) user_regs(task_thread_info(task))
 73#define current_regs() user_regs(current_thread_info())
 74
 75extern inline void prepare_to_copy(struct task_struct *tsk)
 76{
 77}
 78
 79#define INIT_SP         (sizeof(init_stack) + (unsigned long) &init_stack)
 80
 81#define INIT_THREAD  { }
 82
 83
 84#define KSTK_EIP(tsk)   (task_pt_regs(tsk)->pc);
 85#define KSTK_ESP(tsk)   (task_pt_regs(tsk)->sp);
 86
 87
 88extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 89
 90void start_thread(struct pt_regs *regs, unsigned long nip, unsigned long sp);
 91void release_thread(struct task_struct *);
 92unsigned long get_wchan(struct task_struct *p);
 93
 94/*
 95 * Free current thread data structures etc..
 96 */
 97
 98extern inline void exit_thread(void)
 99{
100	/* Nothing needs to be done.  */
101}
102
103/*
104 * Return saved PC of a blocked thread. For now, this is the "user" PC
105 */
106extern unsigned long thread_saved_pc(struct task_struct *t);
107
108#define init_stack      (init_thread_union.stack)
109
110#define cpu_relax()     do { } while (0)
111
112#endif /* __ASSEMBLY__ */
113#endif /* __ASM_OPENRISC_PROCESSOR_H */

 1/* SPDX-License-Identifier: GPL-2.0-or-later */
 2/*
 3 * OpenRISC Linux
 4 *
 5 * Linux architectural port borrowing liberally from similar works of
 6 * others.  All original copyrights apply as per the original source
 7 * declaration.
 8 *
 9 * OpenRISC implementation:
10 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
11 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
12 * et al.
 
 
 
 
 
13 */
14
15#ifndef __ASM_OPENRISC_PROCESSOR_H
16#define __ASM_OPENRISC_PROCESSOR_H
17
18#include <asm/spr_defs.h>
19#include <asm/page.h>
20#include <asm/ptrace.h>
21
22#define STACK_TOP       TASK_SIZE
23#define STACK_TOP_MAX	STACK_TOP
24/* Kernel and user SR register setting */
25#define KERNEL_SR (SPR_SR_DME | SPR_SR_IME | SPR_SR_ICE \
26		   | SPR_SR_DCE | SPR_SR_SM)
27#define USER_SR   (SPR_SR_DME | SPR_SR_IME | SPR_SR_ICE \
28		   | SPR_SR_DCE | SPR_SR_IEE | SPR_SR_TEE)
 
 
 
 
 
29
30/*
31 * User space process size. This is hardcoded into a few places,
32 * so don't change it unless you know what you are doing.
33 */
34
35#define TASK_SIZE       (0x80000000UL)
36
37/* This decides where the kernel will search for a free chunk of vm
38 * space during mmap's.
39 */
40#define TASK_UNMAPPED_BASE      (TASK_SIZE / 8 * 3)
41
42#ifndef __ASSEMBLY__
43
44struct task_struct;
45
46struct thread_struct {
47};
48
49/*
50 * At user->kernel entry, the pt_regs struct is stacked on the top of the
51 * kernel-stack.  This macro allows us to find those regs for a task.
52 * Notice that subsequent pt_regs stackings, like recursive interrupts
53 * occurring while we're in the kernel, won't affect this - only the first
54 * user->kernel transition registers are reached by this (i.e. not regs
55 * for running signal handler)
56 */
57#define user_regs(thread_info)  (((struct pt_regs *)((unsigned long)(thread_info) + THREAD_SIZE - STACK_FRAME_OVERHEAD)) - 1)
58
59/*
60 * Dito but for the currently running task
61 */
62
63#define task_pt_regs(task) user_regs(task_thread_info(task))
 
 
 
 
 
64
65#define INIT_SP         (sizeof(init_stack) + (unsigned long) &init_stack)
66
67#define INIT_THREAD  { }
68
69
70#define KSTK_EIP(tsk)   (task_pt_regs(tsk)->pc)
71#define KSTK_ESP(tsk)   (task_pt_regs(tsk)->sp)
72
73
 
 
74void start_thread(struct pt_regs *regs, unsigned long nip, unsigned long sp);
75unsigned long __get_wchan(struct task_struct *p);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
76
77#define cpu_relax()     barrier()
78
79#endif /* __ASSEMBLY__ */
80#endif /* __ASM_OPENRISC_PROCESSOR_H */