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58e0166a JB |
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 | ||
53 | struct task_struct; | |
54 | ||
55 | struct 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 | ||
58e0166a JB |
75 | #define INIT_SP (sizeof(init_stack) + (unsigned long) &init_stack) |
76 | ||
77 | #define INIT_THREAD { } | |
78 | ||
79 | ||
1bc0b9fd JB |
80 | #define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc) |
81 | #define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp) | |
58e0166a JB |
82 | |
83 | ||
84 | extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); | |
85 | ||
86 | void start_thread(struct pt_regs *regs, unsigned long nip, unsigned long sp); | |
87 | void release_thread(struct task_struct *); | |
88 | unsigned long get_wchan(struct task_struct *p); | |
89 | ||
90 | /* | |
91 | * Free current thread data structures etc.. | |
92 | */ | |
93 | ||
94 | extern inline void exit_thread(void) | |
95 | { | |
96 | /* Nothing needs to be done. */ | |
97 | } | |
98 | ||
99 | /* | |
100 | * Return saved PC of a blocked thread. For now, this is the "user" PC | |
101 | */ | |
102 | extern unsigned long thread_saved_pc(struct task_struct *t); | |
103 | ||
104 | #define init_stack (init_thread_union.stack) | |
105 | ||
9b76beb0 | 106 | #define cpu_relax() barrier() |
58e0166a JB |
107 | |
108 | #endif /* __ASSEMBLY__ */ | |
109 | #endif /* __ASM_OPENRISC_PROCESSOR_H */ |