1/*
2 *  linux/include/asm-arm26/thread_info.h
3 *
4 *  Copyright (C) 2002 Russell King.
5 *  Copyright (C) 2003 Ian Molton.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11#ifndef __ASM_ARM_THREAD_INFO_H
12#define __ASM_ARM_THREAD_INFO_H
13
14#ifdef __KERNEL__
15
16#ifndef __ASSEMBLY__
17
18struct task_struct;
19struct exec_domain;
20
21#include <linux/compiler.h>
22#include <asm/fpstate.h>
23#include <asm/ptrace.h>
24#include <asm/types.h>
25
26typedef unsigned long mm_segment_t;
27
28struct cpu_context_save {
29	__u32	r4;
30	__u32	r5;
31	__u32	r6;
32	__u32	r7;
33	__u32	r8;
34	__u32	r9;
35	__u32	sl;
36	__u32	fp;
37	__u32	sp;
38	__u32	pc;
39};
40
41/*
42 * low level task data that entry.S needs immediate access to.
43 * We assume cpu_context follows immedately after cpu_domain.
44 */
45struct thread_info {
46	unsigned long		flags;		/* low level flags */
47	int			preempt_count;	/* 0 => preemptable, <0 => bug */
48	mm_segment_t		addr_limit;	/* address limit */
49	struct task_struct	*task;		/* main task structure */
50	struct exec_domain      *exec_domain;   /* execution domain */
51	__u32			cpu;		/* cpu */
52	struct cpu_context_save	cpu_context;	/* cpu context */
53	struct restart_block    restart_block;
54	union fp_state		fpstate;
55};
56
57#define INIT_THREAD_INFO(tsk)			\
58{						\
59	.task		&tsk,			\
60	.exec_domain	&default_exec_domain,	\
61	.flags		0,			\
62	.preempt_count	0,			\
63	.addr_limit	KERNEL_DS,		\
64	.restart_block  = {                             \
65		.fn     = do_no_restart_syscall,        \
66	},                                              \
67}
68
69#define init_thread_info	(init_thread_union.thread_info)
70#define init_stack		(init_thread_union.stack)
71
72/*
73 * how to get the thread information struct from C
74 */
75static inline struct thread_info *current_thread_info(void) __attribute_const__;
76
77static inline struct thread_info *current_thread_info(void)
78{
79	register unsigned long sp asm ("sp");
80	return (struct thread_info *)(sp & ~0x1fff);
81}
82
83#define THREAD_SIZE	PAGE_SIZE
84#define task_pt_regs(task) ((struct pt_regs *)(task_stack_page(task) + THREAD_SIZE - 8) - 1)
85
86extern struct thread_info *alloc_thread_info(struct task_struct *task);
87extern void free_thread_info(struct thread_info *);
88
89#define thread_saved_pc(tsk)	\
90	((unsigned long)(pc_pointer(task_thread_info(tsk)->cpu_context.pc)))
91#define thread_saved_fp(tsk)	\
92	((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
93
94#else /* !__ASSEMBLY__ */
95
96#define TI_FLAGS	0
97#define TI_PREEMPT	4
98#define TI_ADDR_LIMIT	8
99#define TI_TASK		12
100#define TI_EXEC_DOMAIN  16
101#define TI_CPU		20
102#define TI_CPU_SAVE	24
103#define TI_RESTART_BLOCK 28
104#define TI_FPSTATE	68
105
106#endif
107
108#define PREEMPT_ACTIVE	0x04000000
109
110/*
111 * thread information flags:
112 *  TIF_SYSCALL_TRACE	- syscall trace active
113 *  TIF_NOTIFY_RESUME	- resumption notification requested
114 *  TIF_SIGPENDING	- signal pending
115 *  TIF_NEED_RESCHED	- rescheduling necessary
116 *  TIF_USEDFPU		- FPU was used by this task this quantum (SMP)
117 *  TIF_POLLING_NRFLAG	- true if poll_idle() is polling TIF_NEED_RESCHED
118 */
119#define TIF_NOTIFY_RESUME	0
120#define TIF_SIGPENDING		1
121#define TIF_NEED_RESCHED	2
122#define TIF_SYSCALL_TRACE	8
123#define TIF_USED_FPU		16
124#define TIF_POLLING_NRFLAG	17
125#define TIF_MEMDIE		18
126
127#define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
128#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
129#define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
130#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
131#define _TIF_USED_FPU		(1 << TIF_USED_FPU)
132#define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
133
134/*
135 * Change these and you break ASM code in entry-common.S
136 */
137#define _TIF_WORK_MASK		0x000000ff
138
139#endif /* __KERNEL__ */
140#endif /* __ASM_ARM_THREAD_INFO_H */
141