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 */
  35 struct task_struct;
  36
  37 /*
  38  * Bus types
  39  */
  40 #define EISA_bus 0
  41
  42 struct 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
  58 extern struct pt_regs *__kernel_frame0_ptr;
  59 extern 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)                  \
  81 do {                                                    \
  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. */
  88 static inline void release_thread(struct task_struct *dead_task)
  89 {
  90 }
  91
  92 extern asmlinkage void save_user_regs(struct user_context *target);
  93 extern 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  * Return saved PC of a blocked thread.
 101  */
 102 extern unsigned long thread_saved_pc(struct task_struct *tsk);
 103
 104 unsigned long get_wchan(struct task_struct *p);
 105
 106 #define KSTK_EIP(tsk)   ((tsk)->thread.frame0->pc)
 107 #define KSTK_ESP(tsk)   ((tsk)->thread.frame0->sp)
 108
 109 #define cpu_relax() barrier()
 110 #define cpu_relax_lowlatency() cpu_relax()
 111
 112 /* data cache prefetch */
 113 #define ARCH_HAS_PREFETCH
 114 static inline void prefetch(const void *x)
 115 {
 116         asm volatile("dcpl %0,gr0,#0" : : "r"(x));
 117 }
 118
 119 #endif /* __ASSEMBLY__ */
 120 #endif /* _ASM_PROCESSOR_H */