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1da177e4 LT |
1 | /* thread_info.h: i386 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 <linux/config.h> | |
13 | #include <linux/compiler.h> | |
14 | #include <asm/page.h> | |
15 | ||
16 | #ifndef __ASSEMBLY__ | |
17 | #include <asm/processor.h> | |
18 | #endif | |
19 | ||
20 | /* | |
21 | * low level task data that entry.S needs immediate access to | |
22 | * - this struct should fit entirely inside of one cache line | |
23 | * - this struct shares the supervisor stack pages | |
24 | * - if the contents of this structure are changed, the assembly constants must also be changed | |
25 | */ | |
26 | #ifndef __ASSEMBLY__ | |
27 | ||
28 | struct thread_info { | |
29 | struct task_struct *task; /* main task structure */ | |
30 | struct exec_domain *exec_domain; /* execution domain */ | |
31 | unsigned long flags; /* low level flags */ | |
32 | unsigned long status; /* thread-synchronous flags */ | |
33 | __u32 cpu; /* current CPU */ | |
dcd497f9 | 34 | int preempt_count; /* 0 => preemptable, <0 => BUG */ |
1da177e4 LT |
35 | |
36 | ||
37 | mm_segment_t addr_limit; /* thread address space: | |
38 | 0-0xBFFFFFFF for user-thead | |
39 | 0-0xFFFFFFFF for kernel-thread | |
40 | */ | |
41 | struct restart_block restart_block; | |
42 | ||
43 | unsigned long previous_esp; /* ESP of the previous stack in case | |
44 | of nested (IRQ) stacks | |
45 | */ | |
46 | __u8 supervisor_stack[0]; | |
47 | }; | |
48 | ||
49 | #else /* !__ASSEMBLY__ */ | |
50 | ||
86feeaa8 | 51 | #include <asm/asm-offsets.h> |
1da177e4 LT |
52 | |
53 | #endif | |
54 | ||
55 | #define PREEMPT_ACTIVE 0x10000000 | |
56 | #ifdef CONFIG_4KSTACKS | |
57 | #define THREAD_SIZE (4096) | |
58 | #else | |
59 | #define THREAD_SIZE (8192) | |
60 | #endif | |
61 | ||
62 | #define STACK_WARN (THREAD_SIZE/8) | |
63 | /* | |
64 | * macros/functions for gaining access to the thread information structure | |
65 | * | |
66 | * preempt_count needs to be 1 initially, until the scheduler is functional. | |
67 | */ | |
68 | #ifndef __ASSEMBLY__ | |
69 | ||
70 | #define INIT_THREAD_INFO(tsk) \ | |
71 | { \ | |
72 | .task = &tsk, \ | |
73 | .exec_domain = &default_exec_domain, \ | |
74 | .flags = 0, \ | |
75 | .cpu = 0, \ | |
76 | .preempt_count = 1, \ | |
77 | .addr_limit = KERNEL_DS, \ | |
78 | .restart_block = { \ | |
79 | .fn = do_no_restart_syscall, \ | |
80 | }, \ | |
81 | } | |
82 | ||
83 | #define init_thread_info (init_thread_union.thread_info) | |
84 | #define init_stack (init_thread_union.stack) | |
85 | ||
86 | ||
87 | /* how to get the thread information struct from C */ | |
88 | static inline struct thread_info *current_thread_info(void) | |
89 | { | |
90 | struct thread_info *ti; | |
91 | __asm__("andl %%esp,%0; ":"=r" (ti) : "0" (~(THREAD_SIZE - 1))); | |
92 | return ti; | |
93 | } | |
94 | ||
95 | /* how to get the current stack pointer from C */ | |
96 | register unsigned long current_stack_pointer asm("esp") __attribute_used__; | |
97 | ||
98 | /* thread information allocation */ | |
99 | #ifdef CONFIG_DEBUG_STACK_USAGE | |
100 | #define alloc_thread_info(tsk) \ | |
101 | ({ \ | |
102 | struct thread_info *ret; \ | |
103 | \ | |
104 | ret = kmalloc(THREAD_SIZE, GFP_KERNEL); \ | |
105 | if (ret) \ | |
106 | memset(ret, 0, THREAD_SIZE); \ | |
107 | ret; \ | |
108 | }) | |
109 | #else | |
110 | #define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL) | |
111 | #endif | |
112 | ||
113 | #define free_thread_info(info) kfree(info) | |
114 | #define get_thread_info(ti) get_task_struct((ti)->task) | |
115 | #define put_thread_info(ti) put_task_struct((ti)->task) | |
116 | ||
117 | #else /* !__ASSEMBLY__ */ | |
118 | ||
119 | /* how to get the thread information struct from ASM */ | |
120 | #define GET_THREAD_INFO(reg) \ | |
121 | movl $-THREAD_SIZE, reg; \ | |
122 | andl %esp, reg | |
123 | ||
124 | /* use this one if reg already contains %esp */ | |
125 | #define GET_THREAD_INFO_WITH_ESP(reg) \ | |
126 | andl $-THREAD_SIZE, reg | |
127 | ||
128 | #endif | |
129 | ||
130 | /* | |
131 | * thread information flags | |
132 | * - these are process state flags that various assembly files may need to access | |
133 | * - pending work-to-be-done flags are in LSW | |
134 | * - other flags in MSW | |
135 | */ | |
136 | #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ | |
137 | #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ | |
138 | #define TIF_SIGPENDING 2 /* signal pending */ | |
139 | #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ | |
140 | #define TIF_SINGLESTEP 4 /* restore singlestep on return to user mode */ | |
141 | #define TIF_IRET 5 /* return with iret */ | |
ed75e8d5 | 142 | #define TIF_SYSCALL_EMU 6 /* syscall emulation active */ |
1da177e4 LT |
143 | #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */ |
144 | #define TIF_SECCOMP 8 /* secure computing */ | |
145 | #define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */ | |
146 | #define TIF_MEMDIE 17 | |
147 | ||
148 | #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) | |
149 | #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) | |
150 | #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) | |
151 | #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) | |
152 | #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) | |
153 | #define _TIF_IRET (1<<TIF_IRET) | |
ed75e8d5 | 154 | #define _TIF_SYSCALL_EMU (1<<TIF_SYSCALL_EMU) |
1da177e4 LT |
155 | #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) |
156 | #define _TIF_SECCOMP (1<<TIF_SECCOMP) | |
157 | #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) | |
158 | ||
159 | /* work to do on interrupt/exception return */ | |
160 | #define _TIF_WORK_MASK \ | |
ed75e8d5 LV |
161 | (0x0000FFFF & ~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP|\ |
162 | _TIF_SECCOMP|_TIF_SYSCALL_EMU)) | |
1da177e4 LT |
163 | /* work to do on any return to u-space */ |
164 | #define _TIF_ALLWORK_MASK (0x0000FFFF & ~_TIF_SECCOMP) | |
165 | ||
166 | /* | |
167 | * Thread-synchronous status. | |
168 | * | |
169 | * This is different from the flags in that nobody else | |
170 | * ever touches our thread-synchronous status, so we don't | |
171 | * have to worry about atomic accesses. | |
172 | */ | |
173 | #define TS_USEDFPU 0x0001 /* FPU was used by this task this quantum (SMP) */ | |
174 | ||
175 | #endif /* __KERNEL__ */ | |
176 | ||
177 | #endif /* _ASM_THREAD_INFO_H */ |