2 * linux/include/asm-arm/thread_info.h
4 * Copyright (C) 2002 Russell King.
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.
10 #ifndef __ASM_ARM_THREAD_INFO_H
11 #define __ASM_ARM_THREAD_INFO_H
15 #include <asm/fpstate.h>
17 #define THREAD_SIZE_ORDER 1
18 #define THREAD_SIZE 8192
19 #define THREAD_START_SP (THREAD_SIZE - 8)
26 #include <asm/ptrace.h>
27 #include <asm/types.h>
28 #include <asm/domain.h>
30 typedef unsigned long mm_segment_t
;
32 struct cpu_context_save
{
43 __u32 extra
[2]; /* Xscale 'acc' register, etc */
47 * low level task data that entry.S needs immediate access to.
48 * __switch_to() assumes cpu_context follows immediately after cpu_domain.
51 unsigned long flags
; /* low level flags */
52 int preempt_count
; /* 0 => preemptable, <0 => bug */
53 mm_segment_t addr_limit
; /* address limit */
54 struct task_struct
*task
; /* main task structure */
55 struct exec_domain
*exec_domain
; /* execution domain */
57 __u32 cpu_domain
; /* cpu domain */
58 struct cpu_context_save cpu_context
; /* cpu context */
59 __u8 used_cp
[16]; /* thread used copro */
60 unsigned long tp_value
;
61 union fp_state fpstate
;
62 union vfp_state vfpstate
;
63 struct restart_block restart_block
;
66 #define INIT_THREAD_INFO(tsk) \
69 .exec_domain = &default_exec_domain, \
72 .addr_limit = KERNEL_DS, \
73 .cpu_domain = domain_val(DOMAIN_USER, DOMAIN_MANAGER) | \
74 domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \
75 domain_val(DOMAIN_IO, DOMAIN_CLIENT), \
77 .fn = do_no_restart_syscall, \
81 #define init_thread_info (init_thread_union.thread_info)
82 #define init_stack (init_thread_union.stack)
85 * how to get the thread information struct from C
87 static inline struct thread_info
*current_thread_info(void) __attribute_const__
;
89 static inline struct thread_info
*current_thread_info(void)
91 register unsigned long sp
asm ("sp");
92 return (struct thread_info
*)(sp
& ~(THREAD_SIZE
- 1));
95 extern struct thread_info
*alloc_thread_info(struct task_struct
*task
);
96 extern void free_thread_info(struct thread_info
*);
98 #define get_thread_info(ti) get_task_struct((ti)->task)
99 #define put_thread_info(ti) put_task_struct((ti)->task)
101 #define thread_saved_pc(tsk) \
102 ((unsigned long)(pc_pointer((tsk)->thread_info->cpu_context.pc)))
103 #define thread_saved_fp(tsk) \
104 ((unsigned long)((tsk)->thread_info->cpu_context.fp))
106 extern void iwmmxt_task_disable(struct thread_info
*);
107 extern void iwmmxt_task_copy(struct thread_info
*, void *);
108 extern void iwmmxt_task_restore(struct thread_info
*, void *);
109 extern void iwmmxt_task_release(struct thread_info
*);
114 * We use bit 30 of the preempt_count to indicate that kernel
115 * preemption is occuring. See include/asm-arm/hardirq.h.
117 #define PREEMPT_ACTIVE 0x40000000
120 * thread information flags:
121 * TIF_SYSCALL_TRACE - syscall trace active
122 * TIF_NOTIFY_RESUME - resumption notification requested
123 * TIF_SIGPENDING - signal pending
124 * TIF_NEED_RESCHED - rescheduling necessary
125 * TIF_USEDFPU - FPU was used by this task this quantum (SMP)
126 * TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED
128 #define TIF_NOTIFY_RESUME 0
129 #define TIF_SIGPENDING 1
130 #define TIF_NEED_RESCHED 2
131 #define TIF_SYSCALL_TRACE 8
132 #define TIF_POLLING_NRFLAG 16
133 #define TIF_USING_IWMMXT 17
134 #define TIF_MEMDIE 18
136 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
137 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
138 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
139 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
140 #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
141 #define _TIF_USING_IWMMXT (1 << TIF_USING_IWMMXT)
144 * Change these and you break ASM code in entry-common.S
146 #define _TIF_WORK_MASK 0x000000ff
148 #endif /* __KERNEL__ */
149 #endif /* __ASM_ARM_THREAD_INFO_H */