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 long fpcsr; /* Floating point control status register. */ 48 }; 49 50 /* 51 * At user->kernel entry, the pt_regs struct is stacked on the top of the 52 * kernel-stack. This macro allows us to find those regs for a task. 53 * Notice that subsequent pt_regs stackings, like recursive interrupts 54 * occurring while we're in the kernel, won't affect this - only the first 55 * user->kernel transition registers are reached by this (i.e. not regs 56 * for running signal handler) 57 */ 58 #define user_regs(thread_info) (((struct pt_regs *)((unsigned long)(thread_info) + THREAD_SIZE - STACK_FRAME_OVERHEAD)) - 1) 59 60 /* 61 * Dito but for the currently running task 62 */ 63 64 #define task_pt_regs(task) user_regs(task_thread_info(task)) 65 66 #define INIT_SP (sizeof(init_stack) + (unsigned long) &init_stack) 67 68 #define INIT_THREAD { } 69 70 71 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc) 72 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp) 73 74 75 void start_thread(struct pt_regs *regs, unsigned long nip, unsigned long sp); 76 unsigned long __get_wchan(struct task_struct *p); 77 void show_registers(struct pt_regs *regs); 78 79 #define cpu_relax() barrier() 80 81 #endif /* __ASSEMBLY__ */ 82 #endif /* __ASM_OPENRISC_PROCESSOR_H */ 83