include/asm-arm/processor.h

   1 /*
   2  *  linux/include/asm-arm/processor.h
   3  *
   4  *  Copyright (C) 1995 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 #include <asm/arch/memory.h>
  46 #include <asm/proc/processor.h>
  47
  48 struct debug_info {
  49         int                             nsaved;
  50         struct {
  51                 unsigned long           address;
  52                 unsigned long           insn;
  53         } bp[2];
  54 };
  55
  56 struct thread_struct {
  57         atomic_t                        refcount;
  58                                                         /* fault info     */
  59         unsigned long                   address;
  60         unsigned long                   trap_no;
  61         unsigned long                   error_code;
  62                                                         /* floating point */
  63         union fp_state                  fpstate;
  64                                                         /* debugging      */
  65         struct debug_info               debug;
  66                                                         /* context info   */
  67         struct context_save_struct      *save;
  68         EXTRA_THREAD_STRUCT
  69 };
  70
  71 #define INIT_THREAD  {                                  \
  72         refcount:       ATOMIC_INIT(1),                 \
  73         EXTRA_THREAD_STRUCT_INIT                        \
  74 }
  75
  76 /*
  77  * Return saved PC of a blocked thread.
  78  */
  79 static inline unsigned long thread_saved_pc(struct thread_struct *t)
  80 {
  81         return t->save ? pc_pointer(t->save->pc) : 0;
  82 }
  83
  84 static inline unsigned long get_css_fp(struct thread_struct *t)
  85 {
  86         return t->save ? t->save->fp : 0;
  87 }
  88
  89 /* Forward declaration, a strange C thing */
  90 struct task_struct;
  91
  92 /* Free all resources held by a thread. */
  93 extern void release_thread(struct task_struct *);
  94
  95 /* Copy and release all segment info associated with a VM */
  96 #define copy_segments(tsk, mm)          do { } while (0)
  97 #define release_segments(mm)            do { } while (0)
  98
  99 unsigned long get_wchan(struct task_struct *p);
 100
 101 #define THREAD_SIZE     (8192)
 102
 103 extern struct task_struct *alloc_task_struct(void);
 104 extern void __free_task_struct(struct task_struct *);
 105 #define get_task_struct(p)      atomic_inc(&(p)->thread.refcount)
 106 #define free_task_struct(p)                                     \
 107  do {                                                           \
 108         if (atomic_dec_and_test(&(p)->thread.refcount))         \
 109                 __free_task_struct((p));                        \
 110  } while (0)
 111
 112 #define init_task       (init_task_union.task)
 113 #define init_stack      (init_task_union.stack)
 114
 115 #define cpu_relax()     do { } while (0)
 116
 117 /*
 118  * Create a new kernel thread
 119  */
 120 extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
 121
 122 #endif
 123
 124 #endif /* __ASM_ARM_PROCESSOR_H */