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git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - arch/openrisc/include/asm/processor.h
4 * Linux architectural port borrowing liberally from similar works of
5 * others. All original copyrights apply as per the original source
8 * OpenRISC implementation:
9 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
10 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
19 #ifndef __ASM_OPENRISC_PROCESSOR_H
20 #define __ASM_OPENRISC_PROCESSOR_H
22 #include <asm/spr_defs.h>
24 #include <asm/ptrace.h>
26 #define STACK_TOP TASK_SIZE
27 #define STACK_TOP_MAX STACK_TOP
28 /* Kernel and user SR register setting */
29 #define KERNEL_SR (SPR_SR_DME | SPR_SR_IME | SPR_SR_ICE \
30 | SPR_SR_DCE | SPR_SR_SM)
31 #define USER_SR (SPR_SR_DME | SPR_SR_IME | SPR_SR_ICE \
32 | SPR_SR_DCE | SPR_SR_IEE | SPR_SR_TEE)
35 * User space process size. This is hardcoded into a few places,
36 * so don't change it unless you know what you are doing.
39 #define TASK_SIZE (0x80000000UL)
41 /* This decides where the kernel will search for a free chunk of vm
42 * space during mmap's.
44 #define TASK_UNMAPPED_BASE (TASK_SIZE / 8 * 3)
50 struct thread_struct
{
54 * At user->kernel entry, the pt_regs struct is stacked on the top of the
55 * kernel-stack. This macro allows us to find those regs for a task.
56 * Notice that subsequent pt_regs stackings, like recursive interrupts
57 * occurring while we're in the kernel, won't affect this - only the first
58 * user->kernel transition registers are reached by this (i.e. not regs
59 * for running signal handler)
61 #define user_regs(thread_info) (((struct pt_regs *)((unsigned long)(thread_info) + THREAD_SIZE - STACK_FRAME_OVERHEAD)) - 1)
64 * Dito but for the currently running task
67 #define task_pt_regs(task) user_regs(task_thread_info(task))
69 #define INIT_SP (sizeof(init_stack) + (unsigned long) &init_stack)
71 #define INIT_THREAD { }
74 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)
75 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp)
78 void start_thread(struct pt_regs
*regs
, unsigned long nip
, unsigned long sp
);
79 void release_thread(struct task_struct
*);
80 unsigned long get_wchan(struct task_struct
*p
);
82 #define cpu_relax() barrier()
84 #endif /* __ASSEMBLY__ */
85 #endif /* __ASM_OPENRISC_PROCESSOR_H */