/* 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 (0 x80000000UL)
/* 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 __ASSEMBLER__
struct task_struct;
struct thread_struct {
long fpcsr; /* Floating point control status register. */
};
/*
* 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);
unsigned long __get_wchan(struct task_struct *p);
void show_registers(struct pt_regs *regs);
#define cpu_relax() barrier()
#endif /* __ASSEMBLER__ */
#endif /* __ASM_OPENRISC_PROCESSOR_H */
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