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1da177e4 LT |
1 | /* |
2 | * linux/include/asm-arm/thread_info.h | |
3 | * | |
4 | * Copyright (C) 2002 Russell King. | |
5 | * | |
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. | |
9 | */ | |
10 | #ifndef __ASM_ARM_THREAD_INFO_H | |
11 | #define __ASM_ARM_THREAD_INFO_H | |
12 | ||
13 | #ifdef __KERNEL__ | |
14 | ||
8dc39b88 | 15 | #include <linux/compiler.h> |
1da177e4 LT |
16 | #include <asm/fpstate.h> |
17 | ||
4f7a1812 RK |
18 | #define THREAD_SIZE_ORDER 1 |
19 | #define THREAD_SIZE 8192 | |
20 | #define THREAD_START_SP (THREAD_SIZE - 8) | |
21 | ||
1da177e4 LT |
22 | #ifndef __ASSEMBLY__ |
23 | ||
24 | struct task_struct; | |
25 | struct exec_domain; | |
26 | ||
1da177e4 LT |
27 | #include <asm/types.h> |
28 | #include <asm/domain.h> | |
29 | ||
30 | typedef unsigned long mm_segment_t; | |
31 | ||
32 | struct cpu_context_save { | |
33 | __u32 r4; | |
34 | __u32 r5; | |
35 | __u32 r6; | |
36 | __u32 r7; | |
37 | __u32 r8; | |
38 | __u32 r9; | |
39 | __u32 sl; | |
40 | __u32 fp; | |
41 | __u32 sp; | |
42 | __u32 pc; | |
43 | __u32 extra[2]; /* Xscale 'acc' register, etc */ | |
44 | }; | |
45 | ||
46 | /* | |
47 | * low level task data that entry.S needs immediate access to. | |
48 | * __switch_to() assumes cpu_context follows immediately after cpu_domain. | |
49 | */ | |
50 | struct thread_info { | |
51 | unsigned long flags; /* low level flags */ | |
dcd497f9 | 52 | int preempt_count; /* 0 => preemptable, <0 => bug */ |
1da177e4 LT |
53 | mm_segment_t addr_limit; /* address limit */ |
54 | struct task_struct *task; /* main task structure */ | |
55 | struct exec_domain *exec_domain; /* execution domain */ | |
56 | __u32 cpu; /* cpu */ | |
57 | __u32 cpu_domain; /* cpu domain */ | |
58 | struct cpu_context_save cpu_context; /* cpu context */ | |
5ba6d3fe | 59 | __u32 syscall; /* syscall number */ |
1da177e4 LT |
60 | __u8 used_cp[16]; /* thread used copro */ |
61 | unsigned long tp_value; | |
c17fad11 | 62 | struct crunch_state crunchstate; |
cdaabbd7 | 63 | union fp_state fpstate __attribute__((aligned(8))); |
1da177e4 LT |
64 | union vfp_state vfpstate; |
65 | struct restart_block restart_block; | |
66 | }; | |
67 | ||
68 | #define INIT_THREAD_INFO(tsk) \ | |
69 | { \ | |
70 | .task = &tsk, \ | |
71 | .exec_domain = &default_exec_domain, \ | |
72 | .flags = 0, \ | |
73 | .preempt_count = 1, \ | |
74 | .addr_limit = KERNEL_DS, \ | |
75 | .cpu_domain = domain_val(DOMAIN_USER, DOMAIN_MANAGER) | \ | |
76 | domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \ | |
77 | domain_val(DOMAIN_IO, DOMAIN_CLIENT), \ | |
78 | .restart_block = { \ | |
79 | .fn = do_no_restart_syscall, \ | |
80 | }, \ | |
81 | } | |
82 | ||
83 | #define init_thread_info (init_thread_union.thread_info) | |
84 | #define init_stack (init_thread_union.stack) | |
85 | ||
1da177e4 LT |
86 | /* |
87 | * how to get the thread information struct from C | |
88 | */ | |
89 | static inline struct thread_info *current_thread_info(void) __attribute_const__; | |
90 | ||
91 | static inline struct thread_info *current_thread_info(void) | |
92 | { | |
93 | register unsigned long sp asm ("sp"); | |
94 | return (struct thread_info *)(sp & ~(THREAD_SIZE - 1)); | |
95 | } | |
96 | ||
12221442 PG |
97 | /* thread information allocation */ |
98 | #ifdef CONFIG_DEBUG_STACK_USAGE | |
99 | #define alloc_thread_info(tsk) \ | |
100 | ((struct thread_info *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, \ | |
101 | THREAD_SIZE_ORDER)) | |
102 | #else | |
103 | #define alloc_thread_info(tsk) \ | |
104 | ((struct thread_info *)__get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER)) | |
105 | #endif | |
106 | ||
107 | #define free_thread_info(info) \ | |
108 | free_pages((unsigned long)info, THREAD_SIZE_ORDER); | |
1da177e4 | 109 | |
1da177e4 | 110 | #define thread_saved_pc(tsk) \ |
e7c1b32f | 111 | ((unsigned long)(pc_pointer(task_thread_info(tsk)->cpu_context.pc))) |
1da177e4 | 112 | #define thread_saved_fp(tsk) \ |
e7c1b32f | 113 | ((unsigned long)(task_thread_info(tsk)->cpu_context.fp)) |
1da177e4 | 114 | |
c17fad11 LB |
115 | extern void crunch_task_disable(struct thread_info *); |
116 | extern void crunch_task_copy(struct thread_info *, void *); | |
117 | extern void crunch_task_restore(struct thread_info *, void *); | |
118 | extern void crunch_task_release(struct thread_info *); | |
119 | ||
1da177e4 LT |
120 | extern void iwmmxt_task_disable(struct thread_info *); |
121 | extern void iwmmxt_task_copy(struct thread_info *, void *); | |
122 | extern void iwmmxt_task_restore(struct thread_info *, void *); | |
123 | extern void iwmmxt_task_release(struct thread_info *); | |
ae95bfbb | 124 | extern void iwmmxt_task_switch(struct thread_info *); |
1da177e4 LT |
125 | |
126 | #endif | |
127 | ||
128 | /* | |
129 | * We use bit 30 of the preempt_count to indicate that kernel | |
80f7228b | 130 | * preemption is occurring. See include/asm-arm/hardirq.h. |
1da177e4 LT |
131 | */ |
132 | #define PREEMPT_ACTIVE 0x40000000 | |
133 | ||
134 | /* | |
135 | * thread information flags: | |
136 | * TIF_SYSCALL_TRACE - syscall trace active | |
137 | * TIF_NOTIFY_RESUME - resumption notification requested | |
138 | * TIF_SIGPENDING - signal pending | |
139 | * TIF_NEED_RESCHED - rescheduling necessary | |
140 | * TIF_USEDFPU - FPU was used by this task this quantum (SMP) | |
141 | * TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED | |
142 | */ | |
143 | #define TIF_NOTIFY_RESUME 0 | |
144 | #define TIF_SIGPENDING 1 | |
145 | #define TIF_NEED_RESCHED 2 | |
146 | #define TIF_SYSCALL_TRACE 8 | |
147 | #define TIF_POLLING_NRFLAG 16 | |
148 | #define TIF_USING_IWMMXT 17 | |
149 | #define TIF_MEMDIE 18 | |
8a102eed | 150 | #define TIF_FREEZE 19 |
1da177e4 LT |
151 | |
152 | #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) | |
153 | #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) | |
154 | #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) | |
155 | #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) | |
156 | #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) | |
157 | #define _TIF_USING_IWMMXT (1 << TIF_USING_IWMMXT) | |
8a102eed | 158 | #define _TIF_FREEZE (1 << TIF_FREEZE) |
1da177e4 LT |
159 | |
160 | /* | |
161 | * Change these and you break ASM code in entry-common.S | |
162 | */ | |
163 | #define _TIF_WORK_MASK 0x000000ff | |
164 | ||
165 | #endif /* __KERNEL__ */ | |
166 | #endif /* __ASM_ARM_THREAD_INFO_H */ |