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>
22 #include <asm/ptrace.h>
23 #include <asm/types.h>
24 #include <asm/domain.h>
26 typedef unsigned long mm_segment_t
;
28 struct cpu_context_save
{
39 __u32 extra
[2]; /* Xscale 'acc' register, etc */
43 * low level task data that entry.S needs immediate access to.
44 * __switch_to() assumes cpu_context follows immediately after cpu_domain.
47 unsigned long flags
; /* low level flags */
48 __s32 preempt_count
; /* 0 => preemptable, <0 => bug */
49 mm_segment_t addr_limit
; /* address limit */
50 struct task_struct
*task
; /* main task structure */
51 struct exec_domain
*exec_domain
; /* execution domain */
53 __u32 cpu_domain
; /* cpu domain */
54 struct cpu_context_save cpu_context
; /* cpu context */
55 __u8 used_cp
[16]; /* thread used copro */
56 union fp_state fpstate
;
57 union vfp_state vfpstate
;
58 struct restart_block restart_block
;
61 #define INIT_THREAD_INFO(tsk) \
64 .exec_domain = &default_exec_domain, \
67 .addr_limit = KERNEL_DS, \
68 .cpu_domain = domain_val(DOMAIN_USER, DOMAIN_MANAGER) | \
69 domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \
70 domain_val(DOMAIN_IO, DOMAIN_CLIENT), \
72 .fn = do_no_restart_syscall, \
76 #define init_thread_info (init_thread_union.thread_info)
77 #define init_stack (init_thread_union.stack)
80 * how to get the thread information struct from C
82 static inline struct thread_info
*current_thread_info(void) __attribute_const__
;
84 static inline struct thread_info
*current_thread_info(void)
86 register unsigned long sp
asm ("sp");
87 return (struct thread_info
*)(sp
& ~0x1fff);
90 #define THREAD_SIZE (8192)
92 extern struct thread_info
*alloc_thread_info(struct task_struct
*task
);
93 extern void free_thread_info(struct thread_info
*);
95 #define get_thread_info(ti) get_task_struct((ti)->task)
96 #define put_thread_info(ti) put_task_struct((ti)->task)
98 #define thread_saved_pc(tsk) \
99 ((unsigned long)(pc_pointer((tsk)->thread_info->cpu_context.pc)))
100 #define thread_saved_fp(tsk) \
101 ((unsigned long)((tsk)->thread_info->cpu_context.fp))
103 extern void iwmmxt_task_disable(struct thread_info
*);
104 extern void iwmmxt_task_copy(struct thread_info
*, void *);
105 extern void iwmmxt_task_restore(struct thread_info
*, void *);
106 extern void iwmmxt_task_release(struct thread_info
*);
111 * We use bit 30 of the preempt_count to indicate that kernel
112 * preemption is occuring. See include/asm-arm/hardirq.h.
114 #define PREEMPT_ACTIVE 0x40000000
117 * thread information flags:
118 * TIF_SYSCALL_TRACE - syscall trace active
119 * TIF_NOTIFY_RESUME - resumption notification requested
120 * TIF_SIGPENDING - signal pending
121 * TIF_NEED_RESCHED - rescheduling necessary
122 * TIF_USEDFPU - FPU was used by this task this quantum (SMP)
123 * TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED
125 #define TIF_NOTIFY_RESUME 0
126 #define TIF_SIGPENDING 1
127 #define TIF_NEED_RESCHED 2
128 #define TIF_SYSCALL_TRACE 8
129 #define TIF_POLLING_NRFLAG 16
130 #define TIF_USING_IWMMXT 17
132 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
133 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
134 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
135 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
136 #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
137 #define _TIF_USING_IWMMXT (1 << TIF_USING_IWMMXT)
140 * Change these and you break ASM code in entry-common.S
142 #define _TIF_WORK_MASK 0x000000ff
144 #endif /* __KERNEL__ */
145 #endif /* __ASM_ARM_THREAD_INFO_H */