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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 */ | |
76 | #define alloc_thread_info(tsk) \ | |
77 | ((struct thread_info *) __get_free_pages(GFP_KERNEL,THREAD_ORDER)) | |
78 | #define free_thread_info(ti) free_pages((unsigned long) (ti), THREAD_ORDER) | |
79 | #define get_thread_info(ti) get_task_struct((ti)->task) | |
80 | #define put_thread_info(ti) put_task_struct((ti)->task) | |
81 | ||
82 | #else /* !__ASSEMBLY__ */ | |
83 | ||
84 | /* how to get the thread information struct from ASM */ | |
85 | #define GET_THREAD_INFO(reg) \ | |
86 | movq %gs:pda_kernelstack,reg ; \ | |
87 | subq $(THREAD_SIZE-PDA_STACKOFFSET),reg | |
88 | ||
89 | #endif | |
90 | ||
91 | /* | |
92 | * thread information flags | |
93 | * - these are process state flags that various assembly files may need to access | |
94 | * - pending work-to-be-done flags are in LSW | |
95 | * - other flags in MSW | |
96 | * Warning: layout of LSW is hardcoded in entry.S | |
97 | */ | |
98 | #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ | |
99 | #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ | |
100 | #define TIF_SIGPENDING 2 /* signal pending */ | |
101 | #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ | |
102 | #define TIF_SINGLESTEP 4 /* reenable singlestep on user return*/ | |
103 | #define TIF_IRET 5 /* force IRET */ | |
104 | #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */ | |
105 | #define TIF_SECCOMP 8 /* secure computing */ | |
106 | #define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */ | |
107 | #define TIF_IA32 17 /* 32bit process */ | |
108 | #define TIF_FORK 18 /* ret_from_fork */ | |
109 | #define TIF_ABI_PENDING 19 | |
110 | #define TIF_MEMDIE 20 | |
111 | ||
112 | #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) | |
113 | #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) | |
114 | #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) | |
115 | #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) | |
116 | #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) | |
117 | #define _TIF_IRET (1<<TIF_IRET) | |
118 | #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) | |
119 | #define _TIF_SECCOMP (1<<TIF_SECCOMP) | |
120 | #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) | |
121 | #define _TIF_IA32 (1<<TIF_IA32) | |
122 | #define _TIF_FORK (1<<TIF_FORK) | |
123 | #define _TIF_ABI_PENDING (1<<TIF_ABI_PENDING) | |
124 | ||
125 | /* work to do on interrupt/exception return */ | |
126 | #define _TIF_WORK_MASK \ | |
127 | (0x0000FFFF & ~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP|_TIF_SECCOMP)) | |
128 | /* work to do on any return to user space */ | |
129 | #define _TIF_ALLWORK_MASK (0x0000FFFF & ~_TIF_SECCOMP) | |
130 | ||
131 | #define PREEMPT_ACTIVE 0x10000000 | |
132 | ||
133 | /* | |
134 | * Thread-synchronous status. | |
135 | * | |
136 | * This is different from the flags in that nobody else | |
137 | * ever touches our thread-synchronous status, so we don't | |
138 | * have to worry about atomic accesses. | |
139 | */ | |
140 | #define TS_USEDFPU 0x0001 /* FPU was used by this task this quantum (SMP) */ | |
141 | ||
142 | #endif /* __KERNEL__ */ | |
143 | ||
144 | #endif /* _ASM_THREAD_INFO_H */ |