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1da177e4 LT |
1 | /* thread_info.h: description |
2 | * | |
3 | * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * Derived from include/asm-i386/thread_info.h | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; either version | |
10 | * 2 of the License, or (at your option) any later version. | |
11 | */ | |
12 | ||
13 | #ifndef _ASM_THREAD_INFO_H | |
14 | #define _ASM_THREAD_INFO_H | |
15 | ||
16 | #ifdef __KERNEL__ | |
17 | ||
18 | #ifndef __ASSEMBLY__ | |
19 | #include <asm/processor.h> | |
20 | #endif | |
21 | ||
84e8cd6d DH |
22 | #define THREAD_SIZE 8192 |
23 | ||
1da177e4 LT |
24 | /* |
25 | * low level task data that entry.S needs immediate access to | |
26 | * - this struct should fit entirely inside of one cache line | |
27 | * - this struct shares the supervisor stack pages | |
28 | * - if the contents of this structure are changed, the assembly constants must also be changed | |
29 | */ | |
30 | #ifndef __ASSEMBLY__ | |
31 | ||
32 | struct thread_info { | |
33 | struct task_struct *task; /* main task structure */ | |
34 | struct exec_domain *exec_domain; /* execution domain */ | |
35 | unsigned long flags; /* low level flags */ | |
36 | unsigned long status; /* thread-synchronous flags */ | |
37 | __u32 cpu; /* current CPU */ | |
dcd497f9 | 38 | int preempt_count; /* 0 => preemptable, <0 => BUG */ |
1da177e4 LT |
39 | |
40 | mm_segment_t addr_limit; /* thread address space: | |
41 | 0-0xBFFFFFFF for user-thead | |
42 | 0-0xFFFFFFFF for kernel-thread | |
43 | */ | |
44 | struct restart_block restart_block; | |
45 | ||
46 | __u8 supervisor_stack[0]; | |
47 | }; | |
48 | ||
49 | #else /* !__ASSEMBLY__ */ | |
50 | ||
84e8cd6d | 51 | #include <asm/asm-offsets.h> |
1da177e4 LT |
52 | |
53 | #endif | |
54 | ||
8080f231 | 55 | #define PREEMPT_ACTIVE 0x10000000 |
1da177e4 LT |
56 | |
57 | /* | |
58 | * macros/functions for gaining access to the thread information structure | |
59 | * | |
60 | * preempt_count needs to be 1 initially, until the scheduler is functional. | |
61 | */ | |
62 | #ifndef __ASSEMBLY__ | |
63 | ||
64 | #define INIT_THREAD_INFO(tsk) \ | |
65 | { \ | |
66 | .task = &tsk, \ | |
67 | .exec_domain = &default_exec_domain, \ | |
68 | .flags = 0, \ | |
69 | .cpu = 0, \ | |
70 | .preempt_count = 1, \ | |
71 | .addr_limit = KERNEL_DS, \ | |
72 | .restart_block = { \ | |
73 | .fn = do_no_restart_syscall, \ | |
74 | }, \ | |
75 | } | |
76 | ||
77 | #define init_thread_info (init_thread_union.thread_info) | |
78 | #define init_stack (init_thread_union.stack) | |
79 | ||
1da177e4 LT |
80 | /* how to get the thread information struct from C */ |
81 | register struct thread_info *__current_thread_info asm("gr15"); | |
82 | ||
83 | #define current_thread_info() ({ __current_thread_info; }) | |
84 | ||
b69c49b7 FT |
85 | #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR |
86 | ||
1da177e4 LT |
87 | /* thread information allocation */ |
88 | #ifdef CONFIG_DEBUG_STACK_USAGE | |
89 | #define alloc_thread_info(tsk) \ | |
90 | ({ \ | |
91 | struct thread_info *ret; \ | |
92 | \ | |
33bbf959 MK |
93 | ret = kzalloc(THREAD_SIZE, GFP_KERNEL); \ |
94 | \ | |
1da177e4 LT |
95 | ret; \ |
96 | }) | |
97 | #else | |
98 | #define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL) | |
99 | #endif | |
100 | ||
101 | #define free_thread_info(info) kfree(info) | |
1da177e4 | 102 | |
84e8cd6d | 103 | #endif /* __ASSEMBLY__ */ |
1da177e4 LT |
104 | |
105 | /* | |
106 | * thread information flags | |
107 | * - these are process state flags that various assembly files may need to access | |
108 | * - pending work-to-be-done flags are in LSW | |
109 | * - other flags in MSW | |
110 | */ | |
111 | #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ | |
a583f1b5 SE |
112 | #define TIF_SIGPENDING 1 /* signal pending */ |
113 | #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ | |
114 | #define TIF_SINGLESTEP 3 /* restore singlestep on return to user mode */ | |
115 | #define TIF_IRET 4 /* return with iret */ | |
116 | #define TIF_RESTORE_SIGMASK 5 /* restore signal mask in do_signal() */ | |
1da177e4 LT |
117 | #define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */ |
118 | #define TIF_MEMDIE 17 /* OOM killer killed process */ | |
8a102eed | 119 | #define TIF_FREEZE 18 /* freezing for suspend */ |
1da177e4 LT |
120 | |
121 | #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) | |
1da177e4 LT |
122 | #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) |
123 | #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) | |
124 | #define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP) | |
125 | #define _TIF_IRET (1 << TIF_IRET) | |
a411aee9 | 126 | #define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK) |
1da177e4 | 127 | #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) |
8a102eed | 128 | #define _TIF_FREEZE (1 << TIF_FREEZE) |
1da177e4 LT |
129 | |
130 | #define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */ | |
131 | #define _TIF_ALLWORK_MASK 0x0000FFFF /* work to do on any return to u-space */ | |
132 | ||
133 | /* | |
134 | * Thread-synchronous status. | |
135 | * | |
136 | * This is different from the flags in that nobody else | |
137 | * ever touches our thread-synchronous status, so we don't | |
138 | * have to worry about atomic accesses. | |
139 | */ | |
140 | #define TS_USEDFPM 0x0001 /* FPU/Media was used by this task this quantum (SMP) */ | |
141 | ||
142 | #endif /* __KERNEL__ */ | |
143 | ||
144 | #endif /* _ASM_THREAD_INFO_H */ |