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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 */