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 *  CPU type and hardware bug flags. Kept separately for each CPU.
  39 */
  40struct cpuinfo_frv {
  41#ifdef CONFIG_MMU
  42        unsigned long   *pgd_quick;
  43        unsigned long   *pte_quick;
  44        unsigned long   pgtable_cache_sz;
  45#endif
  46} __cacheline_aligned;
  47
  48extern struct cpuinfo_frv __nongprelbss boot_cpu_data;
  49
  50#define cpu_data                (&boot_cpu_data)
  51#define current_cpu_data        boot_cpu_data
  52
  53/*
  54 * Bus types
  55 */
  56#define EISA_bus 0
  57#define MCA_bus 0
  58
  59struct thread_struct {
  60        struct pt_regs          *frame;         /* [GR28] exception frame ptr for this thread */
  61        struct task_struct      *curr;          /* [GR29] current pointer for this thread */
  62        unsigned long           sp;             /* [GR1 ] kernel stack pointer */
  63        unsigned long           fp;             /* [GR2 ] kernel frame pointer */
  64        unsigned long           lr;             /* link register */
  65        unsigned long           pc;             /* program counter */
  66        unsigned long           gr[12];         /* [GR16-GR27] */
  67        unsigned long           sched_lr;       /* LR from schedule() */
  68
  69        union {
  70                struct pt_regs          *frame0;        /* top (user) stack frame */
  71                struct user_context     *user;          /* userspace context */
  72        };
  73} __attribute__((aligned(8)));
  74
  75extern struct pt_regs *__kernel_frame0_ptr;
  76extern struct task_struct *__kernel_current_task;
  77
  78#endif
  79
  80#ifndef __ASSEMBLY__
  81#define INIT_THREAD_FRAME0 \
  82        ((struct pt_regs *) \
  83        (sizeof(init_stack) + (unsigned long) init_stack - sizeof(struct user_context)))
  84
  85#define INIT_THREAD {                           \
  86        NULL,                                   \
  87        (struct task_struct *) init_stack,      \
  88        0, 0, 0, 0,                             \
  89        { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, \
  90        0,                                      \
  91        { INIT_THREAD_FRAME0 },                 \
  92}
  93
  94/*
  95 * do necessary setup to start up a newly executed thread.
  96 * - need to discard the frame stacked by init() invoking the execve syscall
  97 */
  98#define start_thread(_regs, _pc, _usp)                  \
  99do {                                                    \
 100        set_fs(USER_DS); /* reads from user space */    \
 101        __frame = __kernel_frame0_ptr;                  \
 102        __frame->pc     = (_pc);                        \
 103        __frame->psr    &= ~PSR_S;                      \
 104        __frame->sp     = (_usp);                       \
 105} while(0)
 106
 107extern void prepare_to_copy(struct task_struct *tsk);
 108
 109/* Free all resources held by a thread. */
 110static inline void release_thread(struct task_struct *dead_task)
 111{
 112}
 113
 114extern asmlinkage int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 115extern asmlinkage void save_user_regs(struct user_context *target);
 116extern asmlinkage void *restore_user_regs(const struct user_context *target, ...);
 117
 118#define copy_segments(tsk, mm)          do { } while (0)
 119#define release_segments(mm)            do { } while (0)
 120#define forget_segments()               do { } while (0)
 121
 122/*
 123 * Free current thread data structures etc..
 124 */
 125static inline void exit_thread(void)
 126{
 127}
 128
 129/*
 130 * Return saved PC of a blocked thread.
 131 */
 132extern unsigned long thread_saved_pc(struct task_struct *tsk);
 133
 134unsigned long get_wchan(struct task_struct *p);
 135
 136#define KSTK_EIP(tsk)   ((tsk)->thread.frame0->pc)
 137#define KSTK_ESP(tsk)   ((tsk)->thread.frame0->sp)
 138
 139/* Allocation and freeing of basic task resources. */
 140extern struct task_struct *alloc_task_struct(void);
 141extern void free_task_struct(struct task_struct *p);
 142
 143#define cpu_relax()    barrier()
 144
 145/* data cache prefetch */
 146#define ARCH_HAS_PREFETCH
 147static inline void prefetch(const void *x)
 148{
 149        asm volatile("dcpl %0,gr0,#0" : : "r"(x));
 150}
 151
 152#endif /* __ASSEMBLY__ */
 153#endif /* _ASM_PROCESSOR_H */
 154