arch/openrisc/include/asm/processor.h

   1 /*
   2  * OpenRISC Linux
   3  *
   4  * Linux architectural port borrowing liberally from similar works of
   5  * others.  All original copyrights apply as per the original source
   6  * declaration.
   7  *
   8  * OpenRISC implementation:
   9  * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
  10  * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
  11  * et al.
  12  *
  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.
  17  */
  18
  19 #ifndef __ASM_OPENRISC_PROCESSOR_H
  20 #define __ASM_OPENRISC_PROCESSOR_H
  21
  22 #include <asm/spr_defs.h>
  23 #include <asm/page.h>
  24 #include <asm/ptrace.h>
  25
  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)
  33
  34 /*
  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.
  37  */
  38
  39 #define TASK_SIZE       (0x80000000UL)
  40
  41 /* This decides where the kernel will search for a free chunk of vm
  42  * space during mmap's.
  43  */
  44 #define TASK_UNMAPPED_BASE      (TASK_SIZE / 8 * 3)
  45
  46 #ifndef __ASSEMBLY__
  47
  48 struct task_struct;
  49
  50 struct thread_struct {
  51 };
  52
  53 /*
  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)
  60  */
  61 #define user_regs(thread_info)  (((struct pt_regs *)((unsigned long)(thread_info) + THREAD_SIZE - STACK_FRAME_OVERHEAD)) - 1)
  62
  63 /*
  64  * Dito but for the currently running task
  65  */
  66
  67 #define task_pt_regs(task) user_regs(task_thread_info(task))
  68
  69 #define INIT_SP         (sizeof(init_stack) + (unsigned long) &init_stack)
  70
  71 #define INIT_THREAD  { }
  72
  73
  74 #define KSTK_EIP(tsk)   (task_pt_regs(tsk)->pc)
  75 #define KSTK_ESP(tsk)   (task_pt_regs(tsk)->sp)
  76
  77
  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);
  81
  82 #define cpu_relax()     barrier()
  83
  84 #endif /* __ASSEMBLY__ */
  85 #endif /* __ASM_OPENRISC_PROCESSOR_H */