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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 | ||
1da177e4 LT |
12 | |
13 | #ifndef __ASSEMBLY__ | |
14 | ||
15 | #include <asm/processor.h> | |
16 | ||
17 | /* | |
18 | * low level task data that entry.S needs immediate access to | |
19 | * - this struct should fit entirely inside of one cache line | |
20 | * - this struct shares the supervisor stack pages | |
21 | * - if the contents of this structure are changed, the assembly constants | |
22 | * must also be changed | |
23 | */ | |
24 | struct thread_info { | |
25 | struct task_struct *task; /* main task structure */ | |
26 | struct exec_domain *exec_domain; /* execution domain */ | |
27 | unsigned long flags; /* low level flags */ | |
3c37026d | 28 | unsigned long tp_value; /* thread pointer */ |
1da177e4 | 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: | |
a3dddd56 | 33 | 0-0xBFFFFFFF for user-thead |
1da177e4 LT |
34 | 0-0xFFFFFFFF for kernel-thread |
35 | */ | |
36 | struct restart_block restart_block; | |
937a8015 | 37 | struct pt_regs *regs; |
1da177e4 LT |
38 | }; |
39 | ||
40 | /* | |
41 | * macros/functions for gaining access to the thread information structure | |
42 | * | |
43 | * preempt_count needs to be 1 initially, until the scheduler is functional. | |
44 | */ | |
45 | #define INIT_THREAD_INFO(tsk) \ | |
46 | { \ | |
47 | .task = &tsk, \ | |
48 | .exec_domain = &default_exec_domain, \ | |
49 | .flags = 0, \ | |
50 | .cpu = 0, \ | |
51 | .preempt_count = 1, \ | |
52 | .addr_limit = KERNEL_DS, \ | |
53 | .restart_block = { \ | |
54 | .fn = do_no_restart_syscall, \ | |
55 | }, \ | |
56 | } | |
57 | ||
58 | #define init_thread_info (init_thread_union.thread_info) | |
59 | #define init_stack (init_thread_union.stack) | |
60 | ||
61 | /* How to get the thread information struct from C. */ | |
62 | register struct thread_info *__current_thread_info __asm__("$28"); | |
63 | #define current_thread_info() __current_thread_info | |
64 | ||
65 | /* thread information allocation */ | |
875d43e7 | 66 | #if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_32BIT) |
1da177e4 LT |
67 | #define THREAD_SIZE_ORDER (1) |
68 | #endif | |
875d43e7 | 69 | #if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_64BIT) |
1da177e4 LT |
70 | #define THREAD_SIZE_ORDER (2) |
71 | #endif | |
72 | #ifdef CONFIG_PAGE_SIZE_8KB | |
73 | #define THREAD_SIZE_ORDER (1) | |
74 | #endif | |
75 | #ifdef CONFIG_PAGE_SIZE_16KB | |
76 | #define THREAD_SIZE_ORDER (0) | |
77 | #endif | |
78 | #ifdef CONFIG_PAGE_SIZE_64KB | |
79 | #define THREAD_SIZE_ORDER (0) | |
80 | #endif | |
81 | ||
82 | #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) | |
83 | #define THREAD_MASK (THREAD_SIZE - 1UL) | |
84 | ||
85 | #ifdef CONFIG_DEBUG_STACK_USAGE | |
86 | #define alloc_thread_info(tsk) \ | |
87 | ({ \ | |
88 | struct thread_info *ret; \ | |
89 | \ | |
90 | ret = kmalloc(THREAD_SIZE, GFP_KERNEL); \ | |
91 | if (ret) \ | |
92 | memset(ret, 0, THREAD_SIZE); \ | |
93 | ret; \ | |
94 | }) | |
95 | #else | |
96 | #define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL) | |
97 | #endif | |
98 | ||
99 | #define free_thread_info(info) kfree(info) | |
1da177e4 LT |
100 | |
101 | #endif /* !__ASSEMBLY__ */ | |
102 | ||
103 | #define PREEMPT_ACTIVE 0x10000000 | |
104 | ||
105 | /* | |
106 | * thread information flags | |
107 | * - these are process state flags that various assembly files may need to | |
108 | * access | |
109 | * - pending work-to-be-done flags are in LSW | |
110 | * - other flags in MSW | |
111 | */ | |
112 | #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ | |
113 | #define TIF_SIGPENDING 2 /* signal pending */ | |
114 | #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ | |
115 | #define TIF_SYSCALL_AUDIT 4 /* syscall auditing active */ | |
127c6f66 | 116 | #define TIF_SECCOMP 5 /* secure computing */ |
7b3e2fc8 | 117 | #define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */ |
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 | |
89c07fd1 | 121 | #define TIF_FREEZE 19 |
1da177e4 LT |
122 | #define TIF_SYSCALL_TRACE 31 /* syscall trace active */ |
123 | ||
124 | #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) | |
125 | #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) | |
126 | #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) | |
127 | #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) | |
128 | #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) | |
127c6f66 | 129 | #define _TIF_SECCOMP (1<<TIF_SECCOMP) |
7b3e2fc8 | 130 | #define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK) |
1da177e4 LT |
131 | #define _TIF_USEDFPU (1<<TIF_USEDFPU) |
132 | #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) | |
89c07fd1 | 133 | #define _TIF_FREEZE (1<<TIF_FREEZE) |
1da177e4 | 134 | |
127c6f66 RB |
135 | /* work to do on interrupt/exception return */ |
136 | #define _TIF_WORK_MASK (0x0000ffef & ~_TIF_SECCOMP) | |
137 | /* work to do on any return to u-space */ | |
138 | #define _TIF_ALLWORK_MASK (0x8000ffff & ~_TIF_SECCOMP) | |
1da177e4 LT |
139 | |
140 | #endif /* __KERNEL__ */ | |
141 | ||
142 | #endif /* _ASM_THREAD_INFO_H */ |