/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * OpenRISC Linux * * Linux architectural port borrowing liberally from similar works of * others. All original copyrights apply as per the original source * declaration. * * OpenRISC implementation: * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com> * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se> * et al. */ #ifndef __ASM_OPENRISC_PROCESSOR_H #define __ASM_OPENRISC_PROCESSOR_H #include <asm/spr_defs.h> #include <asm/page.h> #include <asm/ptrace.h> #define STACK_TOP TASK_SIZE #define STACK_TOP_MAX STACK_TOP /* Kernel and user SR register setting */ #define KERNEL_SR (SPR_SR_DME | SPR_SR_IME | SPR_SR_ICE \ | SPR_SR_DCE | SPR_SR_SM) #define USER_SR (SPR_SR_DME | SPR_SR_IME | SPR_SR_ICE \ | SPR_SR_DCE | SPR_SR_IEE | SPR_SR_TEE) /* * User space process size. This is hardcoded into a few places, * so don't change it unless you know what you are doing. */ #define TASK_SIZE (0x80000000UL) /* This decides where the kernel will search for a free chunk of vm * space during mmap's. */ #define TASK_UNMAPPED_BASE (TASK_SIZE / 8 * 3) #ifndef __ASSEMBLY__ struct task_struct; struct thread_struct { }; /* * At user->kernel entry, the pt_regs struct is stacked on the top of the * kernel-stack. This macro allows us to find those regs for a task. * Notice that subsequent pt_regs stackings, like recursive interrupts * occurring while we're in the kernel, won't affect this - only the first * user->kernel transition registers are reached by this (i.e. not regs * for running signal handler) */ #define user_regs(thread_info) (((struct pt_regs *)((unsigned long)(thread_info) + THREAD_SIZE - STACK_FRAME_OVERHEAD)) - 1) /* * Dito but for the currently running task */ #define task_pt_regs(task) user_regs(task_thread_info(task)) #define INIT_SP (sizeof(init_stack) + (unsigned long) &init_stack) #define INIT_THREAD { } #define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc) #define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp) void start_thread(struct pt_regs *regs, unsigned long nip, unsigned long sp); void release_thread(struct task_struct *); unsigned long get_wchan(struct task_struct *p); #define cpu_relax() barrier() #endif /* __ASSEMBLY__ */ #endif /* __ASM_OPENRISC_PROCESSOR_H */