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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 | |
1da177e4 LT |
42 | */ |
43 | #define INIT_THREAD_INFO(tsk) \ | |
44 | { \ | |
45 | .task = &tsk, \ | |
46 | .exec_domain = &default_exec_domain, \ | |
293c5bd1 | 47 | .flags = _TIF_FIXADE, \ |
1da177e4 | 48 | .cpu = 0, \ |
c99e6efe | 49 | .preempt_count = INIT_PREEMPT_COUNT, \ |
1da177e4 LT |
50 | .addr_limit = KERNEL_DS, \ |
51 | .restart_block = { \ | |
52 | .fn = do_no_restart_syscall, \ | |
53 | }, \ | |
54 | } | |
55 | ||
56 | #define init_thread_info (init_thread_union.thread_info) | |
57 | #define init_stack (init_thread_union.stack) | |
58 | ||
59 | /* How to get the thread information struct from C. */ | |
60 | register struct thread_info *__current_thread_info __asm__("$28"); | |
61 | #define current_thread_info() __current_thread_info | |
62 | ||
63 | /* thread information allocation */ | |
875d43e7 | 64 | #if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_32BIT) |
1da177e4 LT |
65 | #define THREAD_SIZE_ORDER (1) |
66 | #endif | |
875d43e7 | 67 | #if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_64BIT) |
1da177e4 LT |
68 | #define THREAD_SIZE_ORDER (2) |
69 | #endif | |
70 | #ifdef CONFIG_PAGE_SIZE_8KB | |
71 | #define THREAD_SIZE_ORDER (1) | |
72 | #endif | |
73 | #ifdef CONFIG_PAGE_SIZE_16KB | |
74 | #define THREAD_SIZE_ORDER (0) | |
75 | #endif | |
c52399be RB |
76 | #ifdef CONFIG_PAGE_SIZE_32KB |
77 | #define THREAD_SIZE_ORDER (0) | |
78 | #endif | |
1da177e4 LT |
79 | #ifdef CONFIG_PAGE_SIZE_64KB |
80 | #define THREAD_SIZE_ORDER (0) | |
81 | #endif | |
82 | ||
83 | #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) | |
84 | #define THREAD_MASK (THREAD_SIZE - 1UL) | |
85 | ||
b69c49b7 FT |
86 | #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR |
87 | ||
1da177e4 | 88 | #ifdef CONFIG_DEBUG_STACK_USAGE |
962a9dd4 | 89 | #define alloc_thread_info(tsk) kzalloc(THREAD_SIZE, GFP_KERNEL) |
1da177e4 LT |
90 | #else |
91 | #define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL) | |
92 | #endif | |
93 | ||
94 | #define free_thread_info(info) kfree(info) | |
1da177e4 LT |
95 | |
96 | #endif /* !__ASSEMBLY__ */ | |
97 | ||
98 | #define PREEMPT_ACTIVE 0x10000000 | |
99 | ||
100 | /* | |
101 | * thread information flags | |
102 | * - these are process state flags that various assembly files may need to | |
103 | * access | |
104 | * - pending work-to-be-done flags are in LSW | |
105 | * - other flags in MSW | |
106 | */ | |
a583f1b5 SE |
107 | #define TIF_SIGPENDING 1 /* signal pending */ |
108 | #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ | |
109 | #define TIF_SYSCALL_AUDIT 3 /* syscall auditing active */ | |
110 | #define TIF_SECCOMP 4 /* secure computing */ | |
d0420c83 | 111 | #define TIF_NOTIFY_RESUME 5 /* callback before returning to user */ |
7b3e2fc8 | 112 | #define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */ |
1da177e4 LT |
113 | #define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */ |
114 | #define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */ | |
0ddc9324 | 115 | #define TIF_MEMDIE 18 /* is terminating due to OOM killer */ |
89c07fd1 | 116 | #define TIF_FREEZE 19 |
293c5bd1 RB |
117 | #define TIF_FIXADE 20 /* Fix address errors in software */ |
118 | #define TIF_LOGADE 21 /* Log address errors to syslog */ | |
119 | #define TIF_32BIT_REGS 22 /* also implies 16/32 fprs */ | |
120 | #define TIF_32BIT_ADDR 23 /* 32-bit address space (o32/n32) */ | |
121 | #define TIF_FPUBOUND 24 /* thread bound to FPU-full CPU set */ | |
6aa3524c | 122 | #define TIF_LOAD_WATCH 25 /* If set, load watch registers */ |
1da177e4 LT |
123 | #define TIF_SYSCALL_TRACE 31 /* syscall trace active */ |
124 | ||
3b289d6e ZL |
125 | #ifdef CONFIG_MIPS32_O32 |
126 | #define TIF_32BIT TIF_32BIT_REGS | |
127 | #elif defined(CONFIG_MIPS32_N32) | |
128 | #define TIF_32BIT _TIF_32BIT_ADDR | |
129 | #endif /* CONFIG_MIPS32_O32 */ | |
130 | ||
1da177e4 | 131 | #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) |
1da177e4 LT |
132 | #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) |
133 | #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) | |
134 | #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) | |
127c6f66 | 135 | #define _TIF_SECCOMP (1<<TIF_SECCOMP) |
d0420c83 | 136 | #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) |
7b3e2fc8 | 137 | #define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK) |
1da177e4 LT |
138 | #define _TIF_USEDFPU (1<<TIF_USEDFPU) |
139 | #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) | |
89c07fd1 | 140 | #define _TIF_FREEZE (1<<TIF_FREEZE) |
293c5bd1 RB |
141 | #define _TIF_FIXADE (1<<TIF_FIXADE) |
142 | #define _TIF_LOGADE (1<<TIF_LOGADE) | |
143 | #define _TIF_32BIT_REGS (1<<TIF_32BIT_REGS) | |
144 | #define _TIF_32BIT_ADDR (1<<TIF_32BIT_ADDR) | |
145 | #define _TIF_FPUBOUND (1<<TIF_FPUBOUND) | |
6aa3524c | 146 | #define _TIF_LOAD_WATCH (1<<TIF_LOAD_WATCH) |
1da177e4 | 147 | |
127c6f66 | 148 | /* work to do on interrupt/exception return */ |
24459946 RB |
149 | #define _TIF_WORK_MASK (0x0000ffef & \ |
150 | ~(_TIF_SECCOMP | _TIF_SYSCALL_AUDIT)) | |
127c6f66 RB |
151 | /* work to do on any return to u-space */ |
152 | #define _TIF_ALLWORK_MASK (0x8000ffff & ~_TIF_SECCOMP) | |
1da177e4 LT |
153 | |
154 | #endif /* __KERNEL__ */ | |
155 | ||
156 | #endif /* _ASM_THREAD_INFO_H */ |