1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0-or-later */ 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * OpenRISC Linux 4*4882a593Smuzhiyun * 5*4882a593Smuzhiyun * Linux architectural port borrowing liberally from similar works of 6*4882a593Smuzhiyun * others. All original copyrights apply as per the original source 7*4882a593Smuzhiyun * declaration. 8*4882a593Smuzhiyun * 9*4882a593Smuzhiyun * OpenRISC implementation: 10*4882a593Smuzhiyun * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com> 11*4882a593Smuzhiyun * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se> 12*4882a593Smuzhiyun * et al. 13*4882a593Smuzhiyun */ 14*4882a593Smuzhiyun 15*4882a593Smuzhiyun #ifndef __ASM_OPENRISC_PROCESSOR_H 16*4882a593Smuzhiyun #define __ASM_OPENRISC_PROCESSOR_H 17*4882a593Smuzhiyun 18*4882a593Smuzhiyun #include <asm/spr_defs.h> 19*4882a593Smuzhiyun #include <asm/page.h> 20*4882a593Smuzhiyun #include <asm/ptrace.h> 21*4882a593Smuzhiyun 22*4882a593Smuzhiyun #define STACK_TOP TASK_SIZE 23*4882a593Smuzhiyun #define STACK_TOP_MAX STACK_TOP 24*4882a593Smuzhiyun /* Kernel and user SR register setting */ 25*4882a593Smuzhiyun #define KERNEL_SR (SPR_SR_DME | SPR_SR_IME | SPR_SR_ICE \ 26*4882a593Smuzhiyun | SPR_SR_DCE | SPR_SR_SM) 27*4882a593Smuzhiyun #define USER_SR (SPR_SR_DME | SPR_SR_IME | SPR_SR_ICE \ 28*4882a593Smuzhiyun | SPR_SR_DCE | SPR_SR_IEE | SPR_SR_TEE) 29*4882a593Smuzhiyun 30*4882a593Smuzhiyun /* 31*4882a593Smuzhiyun * User space process size. This is hardcoded into a few places, 32*4882a593Smuzhiyun * so don't change it unless you know what you are doing. 33*4882a593Smuzhiyun */ 34*4882a593Smuzhiyun 35*4882a593Smuzhiyun #define TASK_SIZE (0x80000000UL) 36*4882a593Smuzhiyun 37*4882a593Smuzhiyun /* This decides where the kernel will search for a free chunk of vm 38*4882a593Smuzhiyun * space during mmap's. 39*4882a593Smuzhiyun */ 40*4882a593Smuzhiyun #define TASK_UNMAPPED_BASE (TASK_SIZE / 8 * 3) 41*4882a593Smuzhiyun 42*4882a593Smuzhiyun #ifndef __ASSEMBLY__ 43*4882a593Smuzhiyun 44*4882a593Smuzhiyun struct task_struct; 45*4882a593Smuzhiyun 46*4882a593Smuzhiyun struct thread_struct { 47*4882a593Smuzhiyun }; 48*4882a593Smuzhiyun 49*4882a593Smuzhiyun /* 50*4882a593Smuzhiyun * At user->kernel entry, the pt_regs struct is stacked on the top of the 51*4882a593Smuzhiyun * kernel-stack. This macro allows us to find those regs for a task. 52*4882a593Smuzhiyun * Notice that subsequent pt_regs stackings, like recursive interrupts 53*4882a593Smuzhiyun * occurring while we're in the kernel, won't affect this - only the first 54*4882a593Smuzhiyun * user->kernel transition registers are reached by this (i.e. not regs 55*4882a593Smuzhiyun * for running signal handler) 56*4882a593Smuzhiyun */ 57*4882a593Smuzhiyun #define user_regs(thread_info) (((struct pt_regs *)((unsigned long)(thread_info) + THREAD_SIZE - STACK_FRAME_OVERHEAD)) - 1) 58*4882a593Smuzhiyun 59*4882a593Smuzhiyun /* 60*4882a593Smuzhiyun * Dito but for the currently running task 61*4882a593Smuzhiyun */ 62*4882a593Smuzhiyun 63*4882a593Smuzhiyun #define task_pt_regs(task) user_regs(task_thread_info(task)) 64*4882a593Smuzhiyun 65*4882a593Smuzhiyun #define INIT_SP (sizeof(init_stack) + (unsigned long) &init_stack) 66*4882a593Smuzhiyun 67*4882a593Smuzhiyun #define INIT_THREAD { } 68*4882a593Smuzhiyun 69*4882a593Smuzhiyun 70*4882a593Smuzhiyun #define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc) 71*4882a593Smuzhiyun #define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp) 72*4882a593Smuzhiyun 73*4882a593Smuzhiyun 74*4882a593Smuzhiyun void start_thread(struct pt_regs *regs, unsigned long nip, unsigned long sp); 75*4882a593Smuzhiyun void release_thread(struct task_struct *); 76*4882a593Smuzhiyun unsigned long get_wchan(struct task_struct *p); 77*4882a593Smuzhiyun 78*4882a593Smuzhiyun #define cpu_relax() barrier() 79*4882a593Smuzhiyun 80*4882a593Smuzhiyun #endif /* __ASSEMBLY__ */ 81*4882a593Smuzhiyun #endif /* __ASM_OPENRISC_PROCESSOR_H */ 82