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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; | |
fc87e906 | 24 | #include <asm/processor.h> |
1da177e4 LT |
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; | |
36197c92 RM |
36 | #ifdef CONFIG_IA32_EMULATION |
37 | void __user *sysenter_return; | |
38 | #endif | |
1da177e4 LT |
39 | }; |
40 | #endif | |
41 | ||
42 | /* | |
43 | * macros/functions for gaining access to the thread information structure | |
44 | * preempt_count needs to be 1 initially, until the scheduler is functional. | |
45 | */ | |
46 | #ifndef __ASSEMBLY__ | |
47 | #define INIT_THREAD_INFO(tsk) \ | |
48 | { \ | |
49 | .task = &tsk, \ | |
50 | .exec_domain = &default_exec_domain, \ | |
51 | .flags = 0, \ | |
52 | .cpu = 0, \ | |
53 | .preempt_count = 1, \ | |
54 | .addr_limit = KERNEL_DS, \ | |
55 | .restart_block = { \ | |
56 | .fn = do_no_restart_syscall, \ | |
57 | }, \ | |
58 | } | |
59 | ||
60 | #define init_thread_info (init_thread_union.thread_info) | |
61 | #define init_stack (init_thread_union.stack) | |
62 | ||
63 | static inline struct thread_info *current_thread_info(void) | |
64 | { | |
65 | struct thread_info *ti; | |
66 | ti = (void *)(read_pda(kernelstack) + PDA_STACKOFFSET - THREAD_SIZE); | |
67 | return ti; | |
68 | } | |
69 | ||
70 | /* do not use in interrupt context */ | |
71 | static inline struct thread_info *stack_thread_info(void) | |
72 | { | |
73 | struct thread_info *ti; | |
74 | __asm__("andq %%rsp,%0; ":"=r" (ti) : "0" (~(THREAD_SIZE - 1))); | |
75 | return ti; | |
76 | } | |
77 | ||
78 | /* thread information allocation */ | |
8501a2fb | 79 | #ifdef CONFIG_DEBUG_STACK_USAGE |
6ea8bad1 | 80 | #define THREAD_FLAGS (GFP_KERNEL | __GFP_ZERO) |
8501a2fb | 81 | #else |
6ea8bad1 | 82 | #define THREAD_FLAGS GFP_KERNEL |
8501a2fb | 83 | #endif |
6ea8bad1 | 84 | |
85 | #define alloc_thread_info(tsk) \ | |
86 | ((struct thread_info *) __get_free_pages(THREAD_FLAGS, THREAD_ORDER)) | |
8501a2fb | 87 | |
1da177e4 | 88 | #define free_thread_info(ti) free_pages((unsigned long) (ti), THREAD_ORDER) |
1da177e4 LT |
89 | |
90 | #else /* !__ASSEMBLY__ */ | |
91 | ||
92 | /* how to get the thread information struct from ASM */ | |
93 | #define GET_THREAD_INFO(reg) \ | |
94 | movq %gs:pda_kernelstack,reg ; \ | |
95 | subq $(THREAD_SIZE-PDA_STACKOFFSET),reg | |
96 | ||
97 | #endif | |
98 | ||
99 | /* | |
100 | * thread information flags | |
101 | * - these are process state flags that various assembly files may need to access | |
102 | * - pending work-to-be-done flags are in LSW | |
103 | * - other flags in MSW | |
104 | * Warning: layout of LSW is hardcoded in entry.S | |
105 | */ | |
106 | #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ | |
1da177e4 LT |
107 | #define TIF_SIGPENDING 2 /* signal pending */ |
108 | #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ | |
109 | #define TIF_SINGLESTEP 4 /* reenable singlestep on user return*/ | |
110 | #define TIF_IRET 5 /* force IRET */ | |
111 | #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */ | |
112 | #define TIF_SECCOMP 8 /* secure computing */ | |
1d001df1 | 113 | #define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal */ |
e02e68d3 | 114 | #define TIF_MCE_NOTIFY 10 /* notify userspace of an MCE */ |
8f4d37ec | 115 | #define TIF_HRTICK_RESCHED 11 /* reprogram hrtick timer */ |
495ab9c0 | 116 | /* 16 free */ |
1da177e4 LT |
117 | #define TIF_IA32 17 /* 32bit process */ |
118 | #define TIF_FORK 18 /* ret_from_fork */ | |
119 | #define TIF_ABI_PENDING 19 | |
120 | #define TIF_MEMDIE 20 | |
d3a4f48d SE |
121 | #define TIF_DEBUG 21 /* uses debug registers */ |
122 | #define TIF_IO_BITMAP 22 /* uses I/O bitmap */ | |
8a102eed | 123 | #define TIF_FREEZE 23 /* is freezing for suspend */ |
e1f28773 | 124 | #define TIF_FORCED_TF 24 /* true if TF in eflags artificially */ |
7e991604 | 125 | #define TIF_DEBUGCTLMSR 25 /* uses thread_struct.debugctlmsr */ |
4bc408a5 MD |
126 | #define TIF_DS_AREA_MSR 26 /* uses thread_struct.ds_area_msr */ |
127 | #define TIF_BTS_TRACE_TS 27 /* record scheduling event timestamps */ | |
1da177e4 LT |
128 | |
129 | #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) | |
1da177e4 LT |
130 | #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) |
131 | #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) | |
132 | #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) | |
133 | #define _TIF_IRET (1<<TIF_IRET) | |
134 | #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) | |
135 | #define _TIF_SECCOMP (1<<TIF_SECCOMP) | |
1d001df1 | 136 | #define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK) |
e02e68d3 | 137 | #define _TIF_MCE_NOTIFY (1<<TIF_MCE_NOTIFY) |
8f4d37ec | 138 | #define _TIF_HRTICK_RESCHED (1<<TIF_HRTICK_RESCHED) |
1da177e4 LT |
139 | #define _TIF_IA32 (1<<TIF_IA32) |
140 | #define _TIF_FORK (1<<TIF_FORK) | |
141 | #define _TIF_ABI_PENDING (1<<TIF_ABI_PENDING) | |
d3a4f48d SE |
142 | #define _TIF_DEBUG (1<<TIF_DEBUG) |
143 | #define _TIF_IO_BITMAP (1<<TIF_IO_BITMAP) | |
8a102eed | 144 | #define _TIF_FREEZE (1<<TIF_FREEZE) |
e1f28773 | 145 | #define _TIF_FORCED_TF (1<<TIF_FORCED_TF) |
7e991604 | 146 | #define _TIF_DEBUGCTLMSR (1<<TIF_DEBUGCTLMSR) |
eee3af4a MM |
147 | #define _TIF_DS_AREA_MSR (1<<TIF_DS_AREA_MSR) |
148 | #define _TIF_BTS_TRACE_TS (1<<TIF_BTS_TRACE_TS) | |
1da177e4 LT |
149 | |
150 | /* work to do on interrupt/exception return */ | |
151 | #define _TIF_WORK_MASK \ | |
152 | (0x0000FFFF & ~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP|_TIF_SECCOMP)) | |
153 | /* work to do on any return to user space */ | |
154 | #define _TIF_ALLWORK_MASK (0x0000FFFF & ~_TIF_SECCOMP) | |
155 | ||
8f4d37ec PZ |
156 | #define _TIF_DO_NOTIFY_MASK \ |
157 | (_TIF_SIGPENDING|_TIF_SINGLESTEP|_TIF_MCE_NOTIFY|_TIF_HRTICK_RESCHED) | |
158 | ||
d3a4f48d | 159 | /* flags to check in __switch_to() */ |
eee3af4a MM |
160 | #define _TIF_WORK_CTXSW \ |
161 | (_TIF_IO_BITMAP|_TIF_DEBUGCTLMSR|_TIF_DS_AREA_MSR|_TIF_BTS_TRACE_TS) | |
162 | #define _TIF_WORK_CTXSW_PREV _TIF_WORK_CTXSW | |
163 | #define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW|_TIF_DEBUG) | |
d3a4f48d | 164 | |
1da177e4 LT |
165 | #define PREEMPT_ACTIVE 0x10000000 |
166 | ||
167 | /* | |
168 | * Thread-synchronous status. | |
169 | * | |
170 | * This is different from the flags in that nobody else | |
171 | * ever touches our thread-synchronous status, so we don't | |
172 | * have to worry about atomic accesses. | |
173 | */ | |
174 | #define TS_USEDFPU 0x0001 /* FPU was used by this task this quantum (SMP) */ | |
bf2fcc6f | 175 | #define TS_COMPAT 0x0002 /* 32bit syscall active */ |
495ab9c0 AK |
176 | #define TS_POLLING 0x0004 /* true if in idle loop and not sleeping */ |
177 | ||
c9f4f06d | 178 | #define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING) |
1da177e4 LT |
179 | |
180 | #endif /* __KERNEL__ */ | |
181 | ||
182 | #endif /* _ASM_THREAD_INFO_H */ |