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
22struct fp_hard_struct {
23	unsigned int save[FP_SIZE];		/* as yet undefined */
24};
25
26struct fp_soft_struct {
27	unsigned int save[FP_SIZE];		/* undefined information */
28};
29
30union fp_state {
31	struct fp_hard_struct	hard;
32	struct fp_soft_struct	soft;
33};
34
35typedef 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
51union debug_insn {
52	u32	arm;
53	u16	thumb;
54};
55
56struct debug_entry {
57	u32			address;
58	union debug_insn	insn;
59};
60
61struct debug_info {
62	int			nsaved;
63	struct debug_entry	bp[2];
64};
65
66struct 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 */
89static inline unsigned long thread_saved_pc(struct thread_struct *t)
90{
91	return t->save ? pc_pointer(t->save->pc) : 0;
92}
93
94static 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 */
100struct task_struct;
101
102/* Free all resources held by a thread. */
103extern 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
109unsigned long get_wchan(struct task_struct *p);
110
111#define THREAD_SIZE	(8192)
112
113extern struct task_struct *alloc_task_struct(void);
114extern 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 */
130extern int arch_kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
131
132#endif
133
134#endif /* __ASM_ARM_PROCESSOR_H */
135