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 /* SR bits user space may change via sigreturn, the rest stay kernel owned */ 30 #define SPR_SR_USER_MASK (SPR_SR_F | SPR_SR_CY | SPR_SR_OV) 31 32 /* 33 * User space process size. This is hardcoded into a few places, 34 * so don't change it unless you know what you are doing. 35 */ 36 37 #define TASK_SIZE (0x80000000UL) 38 39 /* This decides where the kernel will search for a free chunk of vm 40 * space during mmap's. 41 */ 42 #define TASK_UNMAPPED_BASE (TASK_SIZE / 8 * 3) 43 44 #ifndef __ASSEMBLER__ 45 46 struct task_struct; 47 48 struct thread_struct { 49 long fpcsr; /* Floating point control status register. */ 50 }; 51 52 /* 53 * At user->kernel entry, the pt_regs struct is stacked on the top of the 54 * kernel-stack. This macro allows us to find those regs for a task. 55 * Notice that subsequent pt_regs stackings, like recursive interrupts 56 * occurring while we're in the kernel, won't affect this - only the first 57 * user->kernel transition registers are reached by this (i.e. not regs 58 * for running signal handler) 59 */ 60 #define user_regs(thread_info) (((struct pt_regs *)((unsigned long)(thread_info) + THREAD_SIZE - STACK_FRAME_OVERHEAD)) - 1) 61 62 /* 63 * Dito but for the currently running task 64 */ 65 66 #define task_pt_regs(task) user_regs(task_thread_info(task)) 67 68 #define INIT_SP (sizeof(init_stack) + (unsigned long) &init_stack) 69 70 #define INIT_THREAD { } 71 72 73 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc) 74 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp) 75 76 77 void start_thread(struct pt_regs *regs, unsigned long nip, unsigned long sp); 78 unsigned long __get_wchan(struct task_struct *p); 79 void show_registers(struct pt_regs *regs); 80 81 #define cpu_relax() barrier() 82 83 #endif /* __ASSEMBLER__ */ 84 #endif /* __ASM_OPENRISC_PROCESSOR_H */ 85