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1394f032 | 1 | /* |
3750411f | 2 | * Copyright 2004-2010 Analog Devices Inc. |
1394f032 | 3 | * |
96f1050d | 4 | * Licensed under the GPL-2 or later. |
1394f032 BW |
5 | */ |
6 | ||
7 | #ifndef _ASM_THREAD_INFO_H | |
8 | #define _ASM_THREAD_INFO_H | |
9 | ||
10 | #include <asm/page.h> | |
11 | #include <asm/entry.h> | |
12 | #include <asm/l1layout.h> | |
13 | #include <linux/compiler.h> | |
14 | ||
15 | #ifdef __KERNEL__ | |
16 | ||
17 | /* Thread Align Mask to reach to the top of the stack | |
18 | * for any process | |
19 | */ | |
3750411f | 20 | #define ALIGN_PAGE_MASK 0xffffe000 |
1394f032 | 21 | |
12a79911 MF |
22 | /* |
23 | * Size of kernel stack for each process. This must be a power of 2... | |
24 | */ | |
b69c49b7 | 25 | #define THREAD_SIZE_ORDER 1 |
12a79911 | 26 | #define THREAD_SIZE 8192 /* 2 pages */ |
a45d575f | 27 | #define STACK_WARN (THREAD_SIZE/8) |
12a79911 | 28 | |
1394f032 BW |
29 | #ifndef __ASSEMBLY__ |
30 | ||
31 | typedef unsigned long mm_segment_t; | |
32 | ||
33 | /* | |
34 | * low level task data. | |
35 | * If you change this, change the TI_* offsets below to match. | |
36 | */ | |
37 | ||
38 | struct thread_info { | |
39 | struct task_struct *task; /* main task structure */ | |
40 | struct exec_domain *exec_domain; /* execution domain */ | |
41 | unsigned long flags; /* low level flags */ | |
42 | int cpu; /* cpu we're on */ | |
43 | int preempt_count; /* 0 => preemptable, <0 => BUG */ | |
44 | mm_segment_t addr_limit; /* address limit */ | |
45 | struct restart_block restart_block; | |
cc92b870 | 46 | #ifndef CONFIG_SMP |
1394f032 | 47 | struct l1_scratch_task_info l1_task_info; |
cc92b870 | 48 | #endif |
1394f032 BW |
49 | }; |
50 | ||
51 | /* | |
52 | * macros/functions for gaining access to the thread information structure | |
53 | */ | |
54 | #define INIT_THREAD_INFO(tsk) \ | |
55 | { \ | |
56 | .task = &tsk, \ | |
57 | .exec_domain = &default_exec_domain, \ | |
58 | .flags = 0, \ | |
59 | .cpu = 0, \ | |
3750411f | 60 | .preempt_count = INIT_PREEMPT_COUNT, \ |
1394f032 BW |
61 | .restart_block = { \ |
62 | .fn = do_no_restart_syscall, \ | |
63 | }, \ | |
64 | } | |
65 | #define init_thread_info (init_thread_union.thread_info) | |
66 | #define init_stack (init_thread_union.stack) | |
67 | ||
18628e43 RD |
68 | /* Given a task stack pointer, you can find its corresponding |
69 | * thread_info structure just by masking it to the THREAD_SIZE | |
70 | * boundary (currently 8K as you can see above). | |
1394f032 | 71 | */ |
18628e43 | 72 | __attribute_const__ |
1394f032 BW |
73 | static inline struct thread_info *current_thread_info(void) |
74 | { | |
75 | struct thread_info *ti; | |
3750411f | 76 | __asm__("%0 = sp;" : "=da"(ti)); |
12a79911 | 77 | return (struct thread_info *)((long)ti & ~((long)THREAD_SIZE-1)); |
1394f032 BW |
78 | } |
79 | ||
1394f032 BW |
80 | #endif /* __ASSEMBLY__ */ |
81 | ||
82 | /* | |
83 | * Offsets in thread_info structure, used in assembly code | |
84 | */ | |
85 | #define TI_TASK 0 | |
86 | #define TI_EXECDOMAIN 4 | |
87 | #define TI_FLAGS 8 | |
88 | #define TI_CPU 12 | |
89 | #define TI_PREEMPT 16 | |
90 | ||
91 | #define PREEMPT_ACTIVE 0x4000000 | |
92 | ||
93 | /* | |
94 | * thread information flag bit numbers | |
95 | */ | |
96 | #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ | |
a583f1b5 SE |
97 | #define TIF_SIGPENDING 1 /* signal pending */ |
98 | #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ | |
99 | #define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling | |
1394f032 | 100 | TIF_NEED_RESCHED */ |
3750411f | 101 | #define TIF_MEMDIE 4 |
a583f1b5 | 102 | #define TIF_RESTORE_SIGMASK 5 /* restore signal mask in do_signal() */ |
3750411f MF |
103 | #define TIF_FREEZE 6 /* is freezing for suspend */ |
104 | #define TIF_IRQ_SYNC 7 /* sync pipeline stage */ | |
105 | #define TIF_NOTIFY_RESUME 8 /* callback before returning to user */ | |
1394f032 BW |
106 | |
107 | /* as above, but as bit values */ | |
108 | #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) | |
1394f032 BW |
109 | #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) |
110 | #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) | |
111 | #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) | |
112 | #define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK) | |
3750411f MF |
113 | #define _TIF_FREEZE (1<<TIF_FREEZE) |
114 | #define _TIF_IRQ_SYNC (1<<TIF_IRQ_SYNC) | |
115 | #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) | |
1394f032 BW |
116 | |
117 | #define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */ | |
118 | ||
119 | #endif /* __KERNEL__ */ | |
120 | ||
121 | #endif /* _ASM_THREAD_INFO_H */ |