LXR linux/arch/openrisc/include/asm/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 __ASSEMBLY__
  43
  44struct task_struct;
  45
  46struct thread_struct {
  47};
  48
  49/*
  50 * At user->kernel entry, the pt_regs struct is stacked on the top of the
  51 * kernel-stack.  This macro allows us to find those regs for a task.
  52 * Notice that subsequent pt_regs stackings, like recursive interrupts
  53 * occurring while we're in the kernel, won't affect this - only the first
  54 * user->kernel transition registers are reached by this (i.e. not regs
  55 * for running signal handler)
  56 */
  57#define user_regs(thread_info)  (((struct pt_regs *)((unsigned long)(thread_info) + THREAD_SIZE - STACK_FRAME_OVERHEAD)) - 1)
  58
  59/*
  60 * Dito but for the currently running task
  61 */
  62
  63#define task_pt_regs(task) user_regs(task_thread_info(task))
  64
  65#define INIT_SP         (sizeof(init_stack) + (unsigned long) &init_stack)
  66
  67#define INIT_THREAD  { }
  68
  69
  70#define KSTK_EIP(tsk)   (task_pt_regs(tsk)->pc)
  71#define KSTK_ESP(tsk)   (task_pt_regs(tsk)->sp)
  72
  73
  74void start_thread(struct pt_regs *regs, unsigned long nip, unsigned long sp);
  75void release_thread(struct task_struct *);
  76unsigned long get_wchan(struct task_struct *p);
  77
  78#define cpu_relax()     barrier()
  79
  80#endif /* __ASSEMBLY__ */
  81#endif /* __ASM_OPENRISC_PROCESSOR_H */
  82