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Linux/arch/openrisc/include/asm/processor.h

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  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  * Default implementation of macro that returns current
 35  * instruction pointer ("program counter").
 36  */
 37 #define current_text_addr() ({ __label__ _l; _l: &&_l; })
 38 
 39 /*
 40  * User space process size. This is hardcoded into a few places,
 41  * so don't change it unless you know what you are doing.
 42  */
 43 
 44 #define TASK_SIZE       (0x80000000UL)
 45 
 46 /* This decides where the kernel will search for a free chunk of vm
 47  * space during mmap's.
 48  */
 49 #define TASK_UNMAPPED_BASE      (TASK_SIZE / 8 * 3)
 50 
 51 #ifndef __ASSEMBLY__
 52 
 53 struct task_struct;
 54 
 55 struct thread_struct {
 56 };
 57 
 58 /*
 59  * At user->kernel entry, the pt_regs struct is stacked on the top of the
 60  * kernel-stack.  This macro allows us to find those regs for a task.
 61  * Notice that subsequent pt_regs stackings, like recursive interrupts
 62  * occurring while we're in the kernel, won't affect this - only the first
 63  * user->kernel transition registers are reached by this (i.e. not regs
 64  * for running signal handler)
 65  */
 66 #define user_regs(thread_info)  (((struct pt_regs *)((unsigned long)(thread_info) + THREAD_SIZE - STACK_FRAME_OVERHEAD)) - 1)
 67 
 68 /*
 69  * Dito but for the currently running task
 70  */
 71 
 72 #define task_pt_regs(task) user_regs(task_thread_info(task))
 73 
 74 #define INIT_SP         (sizeof(init_stack) + (unsigned long) &init_stack)
 75 
 76 #define INIT_THREAD  { }
 77 
 78 
 79 #define KSTK_EIP(tsk)   (task_pt_regs(tsk)->pc)
 80 #define KSTK_ESP(tsk)   (task_pt_regs(tsk)->sp)
 81 
 82 
 83 void start_thread(struct pt_regs *regs, unsigned long nip, unsigned long sp);
 84 void release_thread(struct task_struct *);
 85 unsigned long get_wchan(struct task_struct *p);
 86 
 87 /*
 88  * Return saved PC of a blocked thread. For now, this is the "user" PC
 89  */
 90 extern unsigned long thread_saved_pc(struct task_struct *t);
 91 
 92 #define init_stack      (init_thread_union.stack)
 93 
 94 #define cpu_relax()     barrier()
 95 #define cpu_relax_lowlatency() cpu_relax()
 96 
 97 #endif /* __ASSEMBLY__ */
 98 #endif /* __ASM_OPENRISC_PROCESSOR_H */
 99 

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