2 * linux/include/asm-arm26/thread_info.h
4 * Copyright (C) 2002 Russell King.
5 * Copyright (C) 2003 Ian Molton.
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.
11 #ifndef __ASM_ARM_THREAD_INFO_H
12 #define __ASM_ARM_THREAD_INFO_H
21 #include <asm/fpstate.h>
22 #include <asm/ptrace.h>
23 #include <asm/types.h>
25 typedef unsigned long mm_segment_t
;
27 struct cpu_context_save
{
41 * low level task data that entry.S needs immediate access to.
42 * We assume cpu_context follows immedately after cpu_domain.
45 unsigned long flags
; /* low level flags */
46 __s32 preempt_count
; /* 0 => preemptable, <0 => bug */
47 mm_segment_t addr_limit
; /* address limit */
48 struct task_struct
*task
; /* main task structure */
49 struct exec_domain
*exec_domain
; /* execution domain */
51 struct cpu_context_save cpu_context
; /* cpu context */
52 struct restart_block restart_block
;
53 union fp_state fpstate
;
56 #define INIT_THREAD_INFO(tsk) \
59 .exec_domain &default_exec_domain, \
62 .addr_limit KERNEL_DS, \
64 .fn = do_no_restart_syscall, \
68 #define init_thread_info (init_thread_union.thread_info)
69 #define init_stack (init_thread_union.stack)
72 * how to get the thread information struct from C
74 static inline struct thread_info
*current_thread_info(void) __attribute_const__
;
76 static inline struct thread_info
*current_thread_info(void)
78 register unsigned long sp
asm ("sp");
79 return (struct thread_info
*)(sp
& ~0x1fff);
82 /* FIXME - PAGE_SIZE < 32K */
83 #define THREAD_SIZE (8192)
84 #define __get_user_regs(x) (((struct pt_regs *)((unsigned long)(x) + THREAD_SIZE - 8)) - 1)
86 extern struct thread_info
*alloc_thread_info(struct task_struct
*task
);
87 extern void free_thread_info(struct thread_info
*);
89 #define get_thread_info(ti) get_task_struct((ti)->task)
90 #define put_thread_info(ti) put_task_struct((ti)->task)
92 #define thread_saved_pc(tsk) \
93 ((unsigned long)(pc_pointer((tsk)->thread_info->cpu_context.pc)))
94 #define thread_saved_fp(tsk) \
95 ((unsigned long)((tsk)->thread_info->cpu_context.fp))
97 #else /* !__ASSEMBLY__ */
101 #define TI_ADDR_LIMIT 8
103 #define TI_EXEC_DOMAIN 16
105 #define TI_CPU_SAVE 24
106 #define TI_RESTART_BLOCK 28
107 #define TI_FPSTATE 68
111 #define PREEMPT_ACTIVE 0x04000000
114 * thread information flags:
115 * TIF_SYSCALL_TRACE - syscall trace active
116 * TIF_NOTIFY_RESUME - resumption notification requested
117 * TIF_SIGPENDING - signal pending
118 * TIF_NEED_RESCHED - rescheduling necessary
119 * TIF_USEDFPU - FPU was used by this task this quantum (SMP)
120 * TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED
122 #define TIF_NOTIFY_RESUME 0
123 #define TIF_SIGPENDING 1
124 #define TIF_NEED_RESCHED 2
125 #define TIF_SYSCALL_TRACE 8
126 #define TIF_USED_FPU 16
127 #define TIF_POLLING_NRFLAG 17
129 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
130 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
131 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
132 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
133 #define _TIF_USED_FPU (1 << TIF_USED_FPU)
134 #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
137 * Change these and you break ASM code in entry-common.S
139 #define _TIF_WORK_MASK 0x000000ff
141 #endif /* __KERNEL__ */
142 #endif /* __ASM_ARM_THREAD_INFO_H */