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1da177e4 LT |
1 | /* thread_info.h: x86_64 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 <asm/page.h> | |
13 | #include <asm/types.h> | |
14 | #include <asm/pda.h> | |
15 | ||
16 | /* | |
17 | * low level task data that entry.S needs immediate access to | |
18 | * - this struct should fit entirely inside of one cache line | |
19 | * - this struct shares the supervisor stack pages | |
20 | */ | |
21 | #ifndef __ASSEMBLY__ | |
22 | struct task_struct; | |
23 | struct exec_domain; | |
24 | #include <asm/mmsegment.h> | |
25 | ||
26 | struct thread_info { | |
27 | struct task_struct *task; /* main task structure */ | |
28 | struct exec_domain *exec_domain; /* execution domain */ | |
29 | __u32 flags; /* low level flags */ | |
30 | __u32 status; /* thread synchronous flags */ | |
31 | __u32 cpu; /* current CPU */ | |
dcd497f9 | 32 | int preempt_count; /* 0 => preemptable, <0 => BUG */ |
1da177e4 LT |
33 | |
34 | mm_segment_t addr_limit; | |
35 | struct restart_block restart_block; | |
36 | }; | |
37 | #endif | |
38 | ||
39 | /* | |
40 | * macros/functions for gaining access to the thread information structure | |
41 | * preempt_count needs to be 1 initially, until the scheduler is functional. | |
42 | */ | |
43 | #ifndef __ASSEMBLY__ | |
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 | static inline struct thread_info *current_thread_info(void) | |
61 | { | |
62 | struct thread_info *ti; | |
63 | ti = (void *)(read_pda(kernelstack) + PDA_STACKOFFSET - THREAD_SIZE); | |
64 | return ti; | |
65 | } | |
66 | ||
67 | /* do not use in interrupt context */ | |
68 | static inline struct thread_info *stack_thread_info(void) | |
69 | { | |
70 | struct thread_info *ti; | |
71 | __asm__("andq %%rsp,%0; ":"=r" (ti) : "0" (~(THREAD_SIZE - 1))); | |
72 | return ti; | |
73 | } | |
74 | ||
75 | /* thread information allocation */ | |
8501a2fb ES |
76 | #ifdef CONFIG_DEBUG_STACK_USAGE |
77 | #define alloc_thread_info(tsk) \ | |
78 | ({ \ | |
79 | struct thread_info *ret; \ | |
80 | \ | |
81 | ret = ((struct thread_info *) __get_free_pages(GFP_KERNEL,THREAD_ORDER)); \ | |
82 | if (ret) \ | |
83 | memset(ret, 0, THREAD_SIZE); \ | |
84 | ret; \ | |
85 | }) | |
86 | #else | |
1da177e4 LT |
87 | #define alloc_thread_info(tsk) \ |
88 | ((struct thread_info *) __get_free_pages(GFP_KERNEL,THREAD_ORDER)) | |
8501a2fb ES |
89 | #endif |
90 | ||
1da177e4 | 91 | #define free_thread_info(ti) free_pages((unsigned long) (ti), THREAD_ORDER) |
1da177e4 LT |
92 | |
93 | #else /* !__ASSEMBLY__ */ | |
94 | ||
95 | /* how to get the thread information struct from ASM */ | |
96 | #define GET_THREAD_INFO(reg) \ | |
97 | movq %gs:pda_kernelstack,reg ; \ | |
98 | subq $(THREAD_SIZE-PDA_STACKOFFSET),reg | |
99 | ||
100 | #endif | |
101 | ||
102 | /* | |
103 | * thread information flags | |
104 | * - these are process state flags that various assembly files may need to access | |
105 | * - pending work-to-be-done flags are in LSW | |
106 | * - other flags in MSW | |
107 | * Warning: layout of LSW is hardcoded in entry.S | |
108 | */ | |
109 | #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ | |
110 | #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ | |
111 | #define TIF_SIGPENDING 2 /* signal pending */ | |
112 | #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ | |
113 | #define TIF_SINGLESTEP 4 /* reenable singlestep on user return*/ | |
114 | #define TIF_IRET 5 /* force IRET */ | |
115 | #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */ | |
116 | #define TIF_SECCOMP 8 /* secure computing */ | |
1d001df1 | 117 | #define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal */ |
495ab9c0 | 118 | /* 16 free */ |
1da177e4 LT |
119 | #define TIF_IA32 17 /* 32bit process */ |
120 | #define TIF_FORK 18 /* ret_from_fork */ | |
121 | #define TIF_ABI_PENDING 19 | |
122 | #define TIF_MEMDIE 20 | |
d3a4f48d SE |
123 | #define TIF_DEBUG 21 /* uses debug registers */ |
124 | #define TIF_IO_BITMAP 22 /* uses I/O bitmap */ | |
8a102eed | 125 | #define TIF_FREEZE 23 /* is freezing for suspend */ |
1da177e4 LT |
126 | |
127 | #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) | |
128 | #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) | |
129 | #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) | |
130 | #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) | |
131 | #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) | |
132 | #define _TIF_IRET (1<<TIF_IRET) | |
133 | #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) | |
134 | #define _TIF_SECCOMP (1<<TIF_SECCOMP) | |
1d001df1 | 135 | #define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK) |
1da177e4 LT |
136 | #define _TIF_IA32 (1<<TIF_IA32) |
137 | #define _TIF_FORK (1<<TIF_FORK) | |
138 | #define _TIF_ABI_PENDING (1<<TIF_ABI_PENDING) | |
d3a4f48d SE |
139 | #define _TIF_DEBUG (1<<TIF_DEBUG) |
140 | #define _TIF_IO_BITMAP (1<<TIF_IO_BITMAP) | |
8a102eed | 141 | #define _TIF_FREEZE (1<<TIF_FREEZE) |
1da177e4 LT |
142 | |
143 | /* work to do on interrupt/exception return */ | |
144 | #define _TIF_WORK_MASK \ | |
145 | (0x0000FFFF & ~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP|_TIF_SECCOMP)) | |
146 | /* work to do on any return to user space */ | |
147 | #define _TIF_ALLWORK_MASK (0x0000FFFF & ~_TIF_SECCOMP) | |
148 | ||
d3a4f48d SE |
149 | /* flags to check in __switch_to() */ |
150 | #define _TIF_WORK_CTXSW (_TIF_DEBUG|_TIF_IO_BITMAP) | |
151 | ||
1da177e4 LT |
152 | #define PREEMPT_ACTIVE 0x10000000 |
153 | ||
154 | /* | |
155 | * Thread-synchronous status. | |
156 | * | |
157 | * This is different from the flags in that nobody else | |
158 | * ever touches our thread-synchronous status, so we don't | |
159 | * have to worry about atomic accesses. | |
160 | */ | |
161 | #define TS_USEDFPU 0x0001 /* FPU was used by this task this quantum (SMP) */ | |
bf2fcc6f | 162 | #define TS_COMPAT 0x0002 /* 32bit syscall active */ |
495ab9c0 AK |
163 | #define TS_POLLING 0x0004 /* true if in idle loop and not sleeping */ |
164 | ||
165 | #define tsk_is_polling(t) ((t)->thread_info->status & TS_POLLING) | |
1da177e4 LT |
166 | |
167 | #endif /* __KERNEL__ */ | |
168 | ||
169 | #endif /* _ASM_THREAD_INFO_H */ |