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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 | ||
13 | #ifndef __ASSEMBLY__ | |
14 | #include <linux/config.h> | |
15 | #include <linux/cache.h> | |
16 | #include <asm/processor.h> | |
17 | #include <asm/page.h> | |
18 | #include <linux/stringify.h> | |
19 | ||
20 | /* | |
21 | * low level task data. | |
22 | */ | |
23 | struct thread_info { | |
24 | struct task_struct *task; /* main task structure */ | |
25 | struct exec_domain *exec_domain; /* execution domain */ | |
26 | int cpu; /* cpu we're on */ | |
dcd497f9 | 27 | int preempt_count; /* 0 => preemptable, <0 => BUG */ |
1da177e4 LT |
28 | struct restart_block restart_block; |
29 | /* set by force_successful_syscall_return */ | |
30 | unsigned char syscall_noerror; | |
31 | /* low level flags - has atomic operations done on it */ | |
32 | unsigned long flags ____cacheline_aligned_in_smp; | |
33 | }; | |
34 | ||
35 | /* | |
36 | * macros/functions for gaining access to the thread information structure | |
37 | * | |
38 | * preempt_count needs to be 1 initially, until the scheduler is functional. | |
39 | */ | |
40 | #define INIT_THREAD_INFO(tsk) \ | |
41 | { \ | |
42 | .task = &tsk, \ | |
43 | .exec_domain = &default_exec_domain, \ | |
44 | .cpu = 0, \ | |
45 | .preempt_count = 1, \ | |
46 | .restart_block = { \ | |
47 | .fn = do_no_restart_syscall, \ | |
48 | }, \ | |
49 | .flags = 0, \ | |
50 | } | |
51 | ||
52 | #define init_thread_info (init_thread_union.thread_info) | |
53 | #define init_stack (init_thread_union.stack) | |
54 | ||
55 | /* thread information allocation */ | |
56 | ||
637a6ff6 OJ |
57 | #define THREAD_SHIFT 14 |
58 | #define THREAD_ORDER (THREAD_SHIFT - PAGE_SHIFT) | |
59 | #define THREAD_SIZE (1 << THREAD_SHIFT) | |
1da177e4 LT |
60 | #ifdef CONFIG_DEBUG_STACK_USAGE |
61 | #define alloc_thread_info(tsk) \ | |
62 | ({ \ | |
63 | struct thread_info *ret; \ | |
64 | \ | |
65 | ret = kmalloc(THREAD_SIZE, GFP_KERNEL); \ | |
66 | if (ret) \ | |
67 | memset(ret, 0, THREAD_SIZE); \ | |
68 | ret; \ | |
69 | }) | |
70 | #else | |
71 | #define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL) | |
72 | #endif | |
73 | #define free_thread_info(ti) kfree(ti) | |
74 | #define get_thread_info(ti) get_task_struct((ti)->task) | |
75 | #define put_thread_info(ti) put_task_struct((ti)->task) | |
76 | ||
77 | /* how to get the thread information struct from C */ | |
78 | static inline struct thread_info *current_thread_info(void) | |
79 | { | |
80 | struct thread_info *ti; | |
81 | __asm__("clrrdi %0,1,%1" : "=r"(ti) : "i" (THREAD_SHIFT)); | |
82 | return ti; | |
83 | } | |
84 | ||
85 | #endif /* __ASSEMBLY__ */ | |
86 | ||
87 | #define PREEMPT_ACTIVE 0x10000000 | |
88 | ||
89 | /* | |
90 | * thread information flag bit numbers | |
91 | */ | |
92 | #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ | |
93 | #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ | |
94 | #define TIF_SIGPENDING 2 /* signal pending */ | |
95 | #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ | |
96 | #define TIF_POLLING_NRFLAG 4 /* true if poll_idle() is polling | |
97 | TIF_NEED_RESCHED */ | |
98 | #define TIF_32BIT 5 /* 32 bit binary */ | |
6dc2f0c7 | 99 | /* #define SPARE 6 */ |
1da177e4 LT |
100 | #define TIF_ABI_PENDING 7 /* 32/64 bit switch needed */ |
101 | #define TIF_SYSCALL_AUDIT 8 /* syscall auditing active */ | |
102 | #define TIF_SINGLESTEP 9 /* singlestepping active */ | |
103 | #define TIF_MEMDIE 10 | |
104 | #define TIF_SECCOMP 11 /* secure computing */ | |
105 | ||
106 | /* as above, but as bit values */ | |
107 | #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) | |
108 | #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) | |
109 | #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) | |
110 | #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) | |
111 | #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) | |
112 | #define _TIF_32BIT (1<<TIF_32BIT) | |
6dc2f0c7 | 113 | /* #define _SPARE (1<<SPARE) */ |
1da177e4 LT |
114 | #define _TIF_ABI_PENDING (1<<TIF_ABI_PENDING) |
115 | #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) | |
116 | #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) | |
117 | #define _TIF_SECCOMP (1<<TIF_SECCOMP) | |
118 | #define _TIF_SYSCALL_T_OR_A (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP) | |
119 | ||
120 | #define _TIF_USER_WORK_MASK (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | \ | |
121 | _TIF_NEED_RESCHED) | |
122 | ||
123 | #endif /* __KERNEL__ */ | |
124 | ||
125 | #endif /* _ASM_THREAD_INFO_H */ |