LXR linux/arch/frv/include/asm/processor.h

   1/* processor.h: FRV processor definitions
   2 *
   3 * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
   4 * Written by David Howells (dhowells@redhat.com)
   5 *
   6 * This program is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU General Public License
   8 * as published by the Free Software Foundation; either version
   9 * 2 of the License, or (at your option) any later version.
  10 */
  11
  12#ifndef _ASM_PROCESSOR_H
  13#define _ASM_PROCESSOR_H
  14
  15#include <asm/mem-layout.h>
  16
  17#ifndef __ASSEMBLY__
  18/*
  19 * Default implementation of macro that returns current
  20 * instruction pointer ("program counter").
  21 */
  22#define current_text_addr() ({ __label__ _l; _l: &&_l;})
  23
  24#include <linux/compiler.h>
  25#include <linux/linkage.h>
  26#include <asm/sections.h>
  27#include <asm/segment.h>
  28#include <asm/fpu.h>
  29#include <asm/registers.h>
  30#include <asm/ptrace.h>
  31#include <asm/current.h>
  32#include <asm/cache.h>
  33
  34/* Forward declaration, a strange C thing */
  35struct task_struct;
  36
  37/*
  38 * Bus types
  39 */
  40#define EISA_bus 0
  41
  42struct thread_struct {
  43        struct pt_regs          *frame;         /* [GR28] exception frame ptr for this thread */
  44        struct task_struct      *curr;          /* [GR29] current pointer for this thread */
  45        unsigned long           sp;             /* [GR1 ] kernel stack pointer */
  46        unsigned long           fp;             /* [GR2 ] kernel frame pointer */
  47        unsigned long           lr;             /* link register */
  48        unsigned long           pc;             /* program counter */
  49        unsigned long           gr[12];         /* [GR16-GR27] */
  50        unsigned long           sched_lr;       /* LR from schedule() */
  51
  52        union {
  53                struct pt_regs          *frame0;        /* top (user) stack frame */
  54                struct user_context     *user;          /* userspace context */
  55        };
  56} __attribute__((aligned(8)));
  57
  58extern struct pt_regs *__kernel_frame0_ptr;
  59extern struct task_struct *__kernel_current_task;
  60
  61#endif
  62
  63#ifndef __ASSEMBLY__
  64#define INIT_THREAD_FRAME0 \
  65        ((struct pt_regs *) \
  66        (sizeof(init_stack) + (unsigned long) init_stack - sizeof(struct user_context)))
  67
  68#define INIT_THREAD {                           \
  69        NULL,                                   \
  70        (struct task_struct *) init_stack,      \
  71        0, 0, 0, 0,                             \
  72        { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, \
  73        0,                                      \
  74        { INIT_THREAD_FRAME0 },                 \
  75}
  76
  77/*
  78 * do necessary setup to start up a newly executed thread.
  79 */
  80#define start_thread(_regs, _pc, _usp)                  \
  81do {                                                    \
  82        _regs->pc       = (_pc);                        \
  83        _regs->psr      &= ~PSR_S;                      \
  84        _regs->sp       = (_usp);                       \
  85} while(0)
  86
  87/* Free all resources held by a thread. */
  88static inline void release_thread(struct task_struct *dead_task)
  89{
  90}
  91
  92extern asmlinkage void save_user_regs(struct user_context *target);
  93extern asmlinkage void *restore_user_regs(const struct user_context *target, ...);
  94
  95#define copy_segments(tsk, mm)          do { } while (0)
  96#define release_segments(mm)            do { } while (0)
  97#define forget_segments()               do { } while (0)
  98
  99/*
 100 * Free current thread data structures etc..
 101 */
 102static inline void exit_thread(void)
 103{
 104}
 105
 106/*
 107 * Return saved PC of a blocked thread.
 108 */
 109extern unsigned long thread_saved_pc(struct task_struct *tsk);
 110
 111unsigned long get_wchan(struct task_struct *p);
 112
 113#define KSTK_EIP(tsk)   ((tsk)->thread.frame0->pc)
 114#define KSTK_ESP(tsk)   ((tsk)->thread.frame0->sp)
 115
 116#define cpu_relax() barrier()
 117#define cpu_relax_lowlatency() cpu_relax()
 118
 119/* data cache prefetch */
 120#define ARCH_HAS_PREFETCH
 121static inline void prefetch(const void *x)
 122{
 123        asm volatile("dcpl %0,gr0,#0" : : "r"(x));
 124}
 125
 126#endif /* __ASSEMBLY__ */
 127#endif /* _ASM_PROCESSOR_H */
 128