processor.h

 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 __ASSEMBLER__
43
44struct task_struct;
45
46struct 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
75void start_thread(struct pt_regs *regs, unsigned long nip, unsigned long sp);
76unsigned long __get_wchan(struct task_struct *p);
77void show_registers(struct pt_regs *regs);
78
79#define cpu_relax()     barrier()
80
81#endif /* __ASSEMBLER__ */
82#endif /* __ASM_OPENRISC_PROCESSOR_H */