Jonas Bonn | 58e0166 | 2011-06-04 22:43:49 +0300 | [diff] [blame] | 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 | |
Jonas Bonn | 58e0166 | 2011-06-04 22:43:49 +0300 | [diff] [blame] | 75 | #define INIT_SP (sizeof(init_stack) + (unsigned long) &init_stack) |
| 76 | |
| 77 | #define INIT_THREAD { } |
| 78 | |
| 79 | |
Jonas Bonn | 1bc0b9f | 2012-03-06 07:57:25 +0100 | [diff] [blame] | 80 | #define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc) |
| 81 | #define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp) |
Jonas Bonn | 58e0166 | 2011-06-04 22:43:49 +0300 | [diff] [blame] | 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 | |
Vladimir Murzin | 9b76beb | 2012-09-17 20:57:08 +0400 | [diff] [blame^] | 106 | #define cpu_relax() barrier() |
Jonas Bonn | 58e0166 | 2011-06-04 22:43:49 +0300 | [diff] [blame] | 107 | |
| 108 | #endif /* __ASSEMBLY__ */ |
| 109 | #endif /* __ASM_OPENRISC_PROCESSOR_H */ |