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1da177e4 LT |
1 | /* thread_info.h: PPC low-level thread information |
2 | * adapted from the i386 version by Paul Mackerras | |
3 | * | |
4 | * Copyright (C) 2002 David Howells (dhowells@redhat.com) | |
5 | * - Incorporating suggestions made by Linus Torvalds and Dave Miller | |
6 | */ | |
7 | ||
8 | #ifndef _ASM_THREAD_INFO_H | |
9 | #define _ASM_THREAD_INFO_H | |
10 | ||
11 | #ifdef __KERNEL__ | |
12 | #ifndef __ASSEMBLY__ | |
13 | /* | |
14 | * low level task data. | |
15 | * If you change this, change the TI_* offsets below to match. | |
16 | */ | |
17 | struct thread_info { | |
18 | struct task_struct *task; /* main task structure */ | |
19 | struct exec_domain *exec_domain; /* execution domain */ | |
20 | unsigned long flags; /* low level flags */ | |
21 | unsigned long local_flags; /* non-racy flags */ | |
22 | int cpu; /* cpu we're on */ | |
dcd497f9 JJ |
23 | int preempt_count; /* 0 => preemptable, |
24 | <0 => BUG */ | |
1da177e4 LT |
25 | struct restart_block restart_block; |
26 | }; | |
27 | ||
28 | #define INIT_THREAD_INFO(tsk) \ | |
29 | { \ | |
30 | .task = &tsk, \ | |
31 | .exec_domain = &default_exec_domain, \ | |
32 | .flags = 0, \ | |
33 | .local_flags = 0, \ | |
34 | .cpu = 0, \ | |
35 | .preempt_count = 1, \ | |
36 | .restart_block = { \ | |
37 | .fn = do_no_restart_syscall, \ | |
38 | }, \ | |
39 | } | |
40 | ||
41 | #define init_thread_info (init_thread_union.thread_info) | |
42 | #define init_stack (init_thread_union.stack) | |
43 | ||
44 | /* | |
45 | * macros/functions for gaining access to the thread information structure | |
46 | */ | |
47 | ||
48 | /* how to get the thread information struct from C */ | |
49 | static inline struct thread_info *current_thread_info(void) | |
50 | { | |
51 | struct thread_info *ti; | |
52 | __asm__("rlwinm %0,1,0,0,18" : "=r"(ti)); | |
53 | return ti; | |
54 | } | |
55 | ||
56 | /* thread information allocation */ | |
57 | #define alloc_thread_info(tsk) ((struct thread_info *) \ | |
58 | __get_free_pages(GFP_KERNEL, 1)) | |
59 | #define free_thread_info(ti) free_pages((unsigned long) (ti), 1) | |
60 | #define get_thread_info(ti) get_task_struct((ti)->task) | |
61 | #define put_thread_info(ti) put_task_struct((ti)->task) | |
62 | #endif /* __ASSEMBLY__ */ | |
63 | ||
64 | /* | |
65 | * Size of kernel stack for each process. | |
66 | */ | |
67 | #define THREAD_SIZE 8192 /* 2 pages */ | |
68 | ||
69 | #define PREEMPT_ACTIVE 0x10000000 | |
70 | ||
71 | /* | |
72 | * thread information flag bit numbers | |
73 | */ | |
74 | #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ | |
75 | #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ | |
76 | #define TIF_SIGPENDING 2 /* signal pending */ | |
77 | #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ | |
78 | #define TIF_POLLING_NRFLAG 4 /* true if poll_idle() is polling | |
79 | TIF_NEED_RESCHED */ | |
80 | #define TIF_MEMDIE 5 | |
ea9c102c DW |
81 | #define TIF_SYSCALL_AUDIT 6 /* syscall auditing active */ |
82 | #define TIF_SECCOMP 7 /* secure computing */ | |
83 | ||
1da177e4 LT |
84 | /* as above, but as bit values */ |
85 | #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) | |
86 | #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) | |
87 | #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) | |
88 | #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) | |
89 | #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) | |
ea9c102c DW |
90 | #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) |
91 | #define _TIF_SECCOMP (1<<TIF_SECCOMP) | |
92 | ||
93 | #define _TIF_SYSCALL_T_OR_A (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP) | |
1da177e4 LT |
94 | |
95 | /* | |
96 | * Non racy (local) flags bit numbers | |
97 | */ | |
98 | #define TIFL_FORCE_NOERROR 0 /* don't return error from current | |
99 | syscall even if result < 0 */ | |
100 | ||
101 | /* as above, but as bit values */ | |
102 | #define _TIFL_FORCE_NOERROR (1<<TIFL_FORCE_NOERROR) | |
103 | ||
104 | ||
105 | #endif /* __KERNEL__ */ | |
106 | ||
107 | #endif /* _ASM_THREAD_INFO_H */ |