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
20 #include <asm/fpstate.h>
21 #include <asm/ptrace.h>
22 #include <asm/types.h>
23 #include <asm/domain.h>
25 typedef unsigned long mm_segment_t;
27 struct cpu_context_save {
38 __u32 extra[2]; /* Xscale 'acc' register, etc */
42 * low level task data that entry.S needs immediate access to.
43 * __switch_to() assumes cpu_context follows immediately after cpu_domain.
46 unsigned long flags; /* low level flags */
47 __s32 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 */
52 __u32 cpu_domain; /* cpu domain */
53 struct cpu_context_save cpu_context; /* cpu context */
54 __u8 used_cp[16]; /* thread used copro */
55 union fp_state fpstate;
56 struct restart_block restart_block;
59 #define INIT_THREAD_INFO(tsk) \
62 .exec_domain = &default_exec_domain, \
65 .addr_limit = KERNEL_DS, \
66 .cpu_domain = domain_val(DOMAIN_USER, DOMAIN_MANAGER) | \
67 domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \
68 domain_val(DOMAIN_IO, DOMAIN_CLIENT), \
70 .fn = do_no_restart_syscall, \
74 #define init_thread_info (init_thread_union.thread_info)
75 #define init_stack (init_thread_union.stack)
78 * how to get the thread information struct from C
80 static inline struct thread_info *current_thread_info(void) __attribute_const__;
82 static inline struct thread_info *current_thread_info(void)
84 register unsigned long sp asm ("sp");
85 return (struct thread_info *)(sp & ~0x1fff);
88 #define THREAD_SIZE (8192)
90 extern struct thread_info *alloc_thread_info(struct task_struct *task);
91 extern void free_thread_info(struct thread_info *);
93 #define get_thread_info(ti) get_task_struct((ti)->task)
94 #define put_thread_info(ti) put_task_struct((ti)->task)
96 #define thread_saved_pc(tsk) \
97 ((unsigned long)(pc_pointer((tsk)->thread_info->cpu_context.pc)))
98 #define thread_saved_fp(tsk) \
99 ((unsigned long)((tsk)->thread_info->cpu_context.fp))
101 #else /* !__ASSEMBLY__ */
105 #define TI_ADDR_LIMIT 8
107 #define TI_EXEC_DOMAIN 16
109 #define TI_CPU_DOMAIN 24
110 #define TI_CPU_SAVE 28
111 #define TI_USED_CP 76
112 #define TI_FPSTATE (TI_USED_CP+16)
116 #define PREEMPT_ACTIVE 0x04000000
119 * thread information flags:
120 * TIF_SYSCALL_TRACE - syscall trace active
121 * TIF_NOTIFY_RESUME - resumption notification requested
122 * TIF_SIGPENDING - signal pending
123 * TIF_NEED_RESCHED - rescheduling necessary
124 * TIF_USEDFPU - FPU was used by this task this quantum (SMP)
125 * TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED
127 #define TIF_NOTIFY_RESUME 0
128 #define TIF_SIGPENDING 1
129 #define TIF_NEED_RESCHED 2
130 #define TIF_SYSCALL_TRACE 8
131 #define TIF_USED_FPU 16
132 #define TIF_POLLING_NRFLAG 17
134 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
135 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
136 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
137 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
138 #define _TIF_USED_FPU (1 << TIF_USED_FPU)
139 #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
142 * Change these and you break ASM code in entry-common.S
144 #define _TIF_WORK_MASK 0x000000ff
146 #endif /* __KERNEL__ */
147 #endif /* __ASM_ARM_THREAD_INFO_H */