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1da177e4 LT |
1 | /* thread_info.h: MIPS low-level thread information |
2 | * | |
3 | * Copyright (C) 2002 David Howells (dhowells@redhat.com) | |
4 | * - Incorporating suggestions made by Linus Torvalds and Dave Miller | |
5 | */ | |
6 | ||
7 | #ifndef _ASM_THREAD_INFO_H | |
8 | #define _ASM_THREAD_INFO_H | |
9 | ||
10 | #ifdef __KERNEL__ | |
11 | ||
12 | #include <linux/config.h> | |
13 | ||
14 | #ifndef __ASSEMBLY__ | |
15 | ||
16 | #include <asm/processor.h> | |
17 | ||
18 | /* | |
19 | * low level task data that entry.S needs immediate access to | |
20 | * - this struct should fit entirely inside of one cache line | |
21 | * - this struct shares the supervisor stack pages | |
22 | * - if the contents of this structure are changed, the assembly constants | |
23 | * must also be changed | |
24 | */ | |
25 | struct thread_info { | |
26 | struct task_struct *task; /* main task structure */ | |
27 | struct exec_domain *exec_domain; /* execution domain */ | |
28 | unsigned long flags; /* low level flags */ | |
29 | __u32 cpu; /* current CPU */ | |
dcd497f9 | 30 | int preempt_count; /* 0 => preemptable, <0 => BUG */ |
1da177e4 LT |
31 | |
32 | mm_segment_t addr_limit; /* thread address space: | |
33 | 0-0xBFFFFFFF for user-thead | |
34 | 0-0xFFFFFFFF for kernel-thread | |
35 | */ | |
36 | struct restart_block restart_block; | |
37 | }; | |
38 | ||
39 | /* | |
40 | * macros/functions for gaining access to the thread information structure | |
41 | * | |
42 | * preempt_count needs to be 1 initially, until the scheduler is functional. | |
43 | */ | |
44 | #define INIT_THREAD_INFO(tsk) \ | |
45 | { \ | |
46 | .task = &tsk, \ | |
47 | .exec_domain = &default_exec_domain, \ | |
48 | .flags = 0, \ | |
49 | .cpu = 0, \ | |
50 | .preempt_count = 1, \ | |
51 | .addr_limit = KERNEL_DS, \ | |
52 | .restart_block = { \ | |
53 | .fn = do_no_restart_syscall, \ | |
54 | }, \ | |
55 | } | |
56 | ||
57 | #define init_thread_info (init_thread_union.thread_info) | |
58 | #define init_stack (init_thread_union.stack) | |
59 | ||
60 | /* How to get the thread information struct from C. */ | |
61 | register struct thread_info *__current_thread_info __asm__("$28"); | |
62 | #define current_thread_info() __current_thread_info | |
63 | ||
64 | /* thread information allocation */ | |
875d43e7 | 65 | #if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_32BIT) |
1da177e4 LT |
66 | #define THREAD_SIZE_ORDER (1) |
67 | #endif | |
875d43e7 | 68 | #if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_64BIT) |
1da177e4 LT |
69 | #define THREAD_SIZE_ORDER (2) |
70 | #endif | |
71 | #ifdef CONFIG_PAGE_SIZE_8KB | |
72 | #define THREAD_SIZE_ORDER (1) | |
73 | #endif | |
74 | #ifdef CONFIG_PAGE_SIZE_16KB | |
75 | #define THREAD_SIZE_ORDER (0) | |
76 | #endif | |
77 | #ifdef CONFIG_PAGE_SIZE_64KB | |
78 | #define THREAD_SIZE_ORDER (0) | |
79 | #endif | |
80 | ||
81 | #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) | |
82 | #define THREAD_MASK (THREAD_SIZE - 1UL) | |
83 | ||
84 | #ifdef CONFIG_DEBUG_STACK_USAGE | |
85 | #define alloc_thread_info(tsk) \ | |
86 | ({ \ | |
87 | struct thread_info *ret; \ | |
88 | \ | |
89 | ret = kmalloc(THREAD_SIZE, GFP_KERNEL); \ | |
90 | if (ret) \ | |
91 | memset(ret, 0, THREAD_SIZE); \ | |
92 | ret; \ | |
93 | }) | |
94 | #else | |
95 | #define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL) | |
96 | #endif | |
97 | ||
98 | #define free_thread_info(info) kfree(info) | |
99 | #define get_thread_info(ti) get_task_struct((ti)->task) | |
100 | #define put_thread_info(ti) put_task_struct((ti)->task) | |
101 | ||
102 | #endif /* !__ASSEMBLY__ */ | |
103 | ||
104 | #define PREEMPT_ACTIVE 0x10000000 | |
105 | ||
106 | /* | |
107 | * thread information flags | |
108 | * - these are process state flags that various assembly files may need to | |
109 | * access | |
110 | * - pending work-to-be-done flags are in LSW | |
111 | * - other flags in MSW | |
112 | */ | |
113 | #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ | |
114 | #define TIF_SIGPENDING 2 /* signal pending */ | |
115 | #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ | |
116 | #define TIF_SYSCALL_AUDIT 4 /* syscall auditing active */ | |
127c6f66 | 117 | #define TIF_SECCOMP 5 /* secure computing */ |
1da177e4 LT |
118 | #define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */ |
119 | #define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */ | |
120 | #define TIF_MEMDIE 18 | |
121 | #define TIF_SYSCALL_TRACE 31 /* syscall trace active */ | |
122 | ||
123 | #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) | |
124 | #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) | |
125 | #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) | |
126 | #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) | |
127 | #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) | |
127c6f66 | 128 | #define _TIF_SECCOMP (1<<TIF_SECCOMP) |
1da177e4 LT |
129 | #define _TIF_USEDFPU (1<<TIF_USEDFPU) |
130 | #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) | |
131 | ||
127c6f66 RB |
132 | /* work to do on interrupt/exception return */ |
133 | #define _TIF_WORK_MASK (0x0000ffef & ~_TIF_SECCOMP) | |
134 | /* work to do on any return to u-space */ | |
135 | #define _TIF_ALLWORK_MASK (0x8000ffff & ~_TIF_SECCOMP) | |
1da177e4 LT |
136 | |
137 | #endif /* __KERNEL__ */ | |
138 | ||
139 | #endif /* _ASM_THREAD_INFO_H */ |