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-armv/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 */ thread_saved_pc(struct thread_struct * t)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 thread_saved_fp(struct thread_struct * t)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 */ 135