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1da177e4 LT |
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 | ||
18 | struct task_struct; | |
19 | struct exec_domain; | |
20 | ||
21 | #include <linux/compiler.h> | |
22 | #include <asm/fpstate.h> | |
23 | #include <asm/ptrace.h> | |
24 | #include <asm/types.h> | |
25 | ||
26 | typedef unsigned long mm_segment_t; | |
27 | ||
28 | struct 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 | */ | |
45 | struct thread_info { | |
46 | unsigned long flags; /* low level flags */ | |
dcd497f9 | 47 | int preempt_count; /* 0 => preemptable, <0 => bug */ |
1da177e4 LT |
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 | */ | |
75 | static inline struct thread_info *current_thread_info(void) __attribute_const__; | |
76 | ||
77 | static 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 | ||
96419b7c | 83 | #define THREAD_SIZE PAGE_SIZE |
7fdf0d7a | 84 | #define task_pt_regs(task) ((struct pt_regs *)(task_stack_page(task) + THREAD_SIZE - 8) - 1) |
1da177e4 LT |
85 | |
86 | extern struct thread_info *alloc_thread_info(struct task_struct *task); | |
87 | extern void free_thread_info(struct thread_info *); | |
88 | ||
1da177e4 | 89 | #define thread_saved_pc(tsk) \ |
697102cd | 90 | ((unsigned long)(pc_pointer(task_thread_info(tsk)->cpu_context.pc))) |
1da177e4 | 91 | #define thread_saved_fp(tsk) \ |
697102cd | 92 | ((unsigned long)(task_thread_info(tsk)->cpu_context.fp)) |
1da177e4 LT |
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 */ |