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
42 #include <asm/atomic.h>
43 #include <asm/ptrace.h>
44 #include <asm/arch/memory.h>
45 #include <asm/proc/processor.h>
46
47 struct debug_info {
48 int nsaved;
49 struct {
50 unsigned long address;
51 unsigned long insn;
52 } bp[2];
53 };
54
55 struct thread_struct {
56 atomic_t refcount;
57 /* fault info */
58 unsigned long address;
59 unsigned long trap_no;
60 unsigned long error_code;
61 /* floating point */
62 union fp_state fpstate;
63 /* debugging */
64 struct debug_info debug;
65 /* context info */
66 struct context_save_struct *save;
67 EXTRA_THREAD_STRUCT
68 };
69
70 #define INIT_MMAP { \
71 vm_mm: &init_mm, \
72 vm_page_prot: PAGE_SHARED, \
73 vm_flags: VM_READ | VM_WRITE | VM_EXEC, \
74 vm_avl_height: 1, \
75 }
76
77 #define INIT_THREAD { \
78 refcount: ATOMIC_INIT(1), \
79 EXTRA_THREAD_STRUCT_INIT \
80 }
81
82 /*
83 * Return saved PC of a blocked thread.
84 */
85 extern __inline__ unsigned long thread_saved_pc(struct thread_struct *t)
86 {
87 return t->save ? pc_pointer(t->save->pc) : 0;
88 }
89
90 extern __inline__ unsigned long get_css_fp(struct thread_struct *t)
91 {
92 return t->save ? t->save->fp : 0;
93 }
94
95 asmlinkage void ret_from_sys_call(void) __asm__("ret_from_sys_call");
96
97 extern __inline__ void init_thread_css(struct context_save_struct *save)
98 {
99 *save = INIT_CSS;
100 save->pc |= (unsigned long)ret_from_sys_call;
101 }
102
103 /* Forward declaration, a strange C thing */
104 struct task_struct;
105
106 /* Free all resources held by a thread. */
107 extern void release_thread(struct task_struct *);
108
109 /* Copy and release all segment info associated with a VM */
110 #define copy_segments(tsk, mm) do { } while (0)
111 #define release_segments(mm) do { } while (0)
112
113 unsigned long get_wchan(struct task_struct *p);
114
115 #define THREAD_SIZE (8192)
116
117 extern struct task_struct *alloc_task_struct(void);
118 extern void __free_task_struct(struct task_struct *);
119 #define get_task_struct(p) atomic_inc(&(p)->thread.refcount)
120 #define free_task_struct(p) \
121 do { \
122 if (atomic_dec_and_test(&(p)->thread.refcount)) \
123 __free_task_struct((p)); \
124 } while (0)
125
126 #define init_task (init_task_union.task)
127 #define init_stack (init_task_union.stack)
128
129 /*
130 * Create a new kernel thread
131 */
132 extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
133
134 #endif
135
136 #endif /* __ASM_ARM_PROCESSOR_H */
137
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