projects / mirror_ubuntu-focal-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 2874c5fd | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| 58e0166a JB |
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. | |
| 58e0166a JB |
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) | |
| 58e0166a JB |
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)) | |
| 58e0166a | 64 | |
| 58e0166a JB |
65 | #define INIT_SP (sizeof(init_stack) + (unsigned long) &init_stack) |
| 66 | ||
| 67 | #define INIT_THREAD { } | |
| 68 | ||
| 69 | ||
| 1bc0b9fd JB |
70 | #define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc) |
| 71 | #define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp) | |
| 58e0166a JB |
72 | |
| 73 | ||
| 58e0166a JB |
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 | ||
| 9b76beb0 | 78 | #define cpu_relax() barrier() |
| 58e0166a JB |
79 | |
| 80 | #endif /* __ASSEMBLY__ */ | |
| 81 | #endif /* __ASM_OPENRISC_PROCESSOR_H */ |