include/asm-arm/processor.h

   1 /*
   2  *  linux/include/asm-arm/processor.h
   3  *
   4  *  Copyright (C) 1995-2002 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #ifndef __ASM_ARM_PROCESSOR_H
  12 #define __ASM_ARM_PROCESSOR_H
  13
  14 /*
  15  * Default implementation of macro that returns current
  16  * instruction pointer ("program counter").
  17  */
  18 #define current_text_addr() ({ __label__ _l; _l: &&_l;})
  19
  20 #define FP_SIZE 35
  21
  22 struct fp_hard_struct {
  23         unsigned int save[FP_SIZE];             /* as yet undefined */
  24 };
  25
  26 struct fp_soft_struct {
  27         unsigned int save[FP_SIZE];             /* undefined information */
  28 };
  29
  30 union fp_state {
  31         struct fp_hard_struct   hard;
  32         struct fp_soft_struct   soft;
  33 };
  34
  35 typedef unsigned long mm_segment_t;             /* domain register      */
  36
  37 #ifdef __KERNEL__
  38
  39 #define EISA_bus 0
  40 #define MCA_bus 0
  41 #define MCA_bus__is_a_macro
  42
  43 #include <asm/atomic.h>
  44 #include <asm/ptrace.h>
  45 #if 0   /* XXX###XXX */
  46 #include <asm/arch/memory.h>
  47 #endif  /* XXX###XXX */
  48 #include <asm/proc/processor.h>
  49 #include <asm/types.h>
  50
  51 union debug_insn {
  52         u32     arm;
  53         u16     thumb;
  54 };
  55
  56 struct debug_entry {
  57         u32                     address;
  58         union debug_insn        insn;
  59 };
  60
  61 struct debug_info {
  62         int                     nsaved;
  63         struct debug_entry      bp[2];
  64 };
  65
  66 struct thread_struct {
  67         atomic_t                        refcount;
  68                                                         /* fault info     */
  69         unsigned long                   address;
  70         unsigned long                   trap_no;
  71         unsigned long                   error_code;
  72                                                         /* floating point */
  73         union fp_state                  fpstate;
  74                                                         /* debugging      */
  75         struct debug_info               debug;
  76                                                         /* context info   */
  77         struct context_save_struct      *save;
  78         EXTRA_THREAD_STRUCT
  79 };
  80
  81 #define INIT_THREAD  {                                  \
  82         refcount:       ATOMIC_INIT(1),                 \
  83         EXTRA_THREAD_STRUCT_INIT                        \
  84 }
  85
  86 /*
  87  * Return saved PC of a blocked thread.
  88  */
  89 static inline unsigned long thread_saved_pc(struct thread_struct *t)
  90 {
  91         return t->save ? pc_pointer(t->save->pc) : 0;
  92 }
  93
  94 static inline unsigned long thread_saved_fp(struct thread_struct *t)
  95 {
  96         return t->save ? t->save->fp : 0;
  97 }
  98
  99 /* Forward declaration, a strange C thing */
 100 struct task_struct;
 101
 102 /* Free all resources held by a thread. */
 103 extern void release_thread(struct task_struct *);
 104
 105 /* Copy and release all segment info associated with a VM */
 106 #define copy_segments(tsk, mm)          do { } while (0)
 107 #define release_segments(mm)            do { } while (0)
 108
 109 unsigned long get_wchan(struct task_struct *p);
 110
 111 #define THREAD_SIZE     (8192)
 112
 113 extern struct task_struct *alloc_task_struct(void);
 114 extern void __free_task_struct(struct task_struct *);
 115 #define get_task_struct(p)      atomic_inc(&(p)->thread.refcount)
 116 #define free_task_struct(p)                                     \
 117  do {                                                           \
 118         if (atomic_dec_and_test(&(p)->thread.refcount))         \
 119                 __free_task_struct((p));                        \
 120  } while (0)
 121
 122 #define init_task       (init_task_union.task)
 123 #define init_stack      (init_task_union.stack)
 124
 125 #define cpu_relax()     barrier()
 126
 127 /*
 128  * Create a new kernel thread
 129  */
 130 extern int arch_kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
 131
 132 #endif
 133
 134 #endif /* __ASM_ARM_PROCESSOR_H */