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
44 struct task_struct;
45
46 struct 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
74 void start_thread(struct pt_regs *regs, unsigned long nip, unsigned long sp);
75 void release_thread(struct task_struct *);
76 unsigned long get_wchan(struct task_struct *p);
77
78 #define cpu_relax() barrier()
79
80 #endif /* __ASSEMBLY__ */
81 #endif /* __ASM_OPENRISC_PROCESSOR_H */