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1da177e4 LT |
1 | /* thread_info.h: CRIS 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 | * CRIS port by Axis Communications | |
7 | */ | |
8 | ||
9 | #ifndef _ASM_THREAD_INFO_H | |
10 | #define _ASM_THREAD_INFO_H | |
11 | ||
12 | #ifdef __KERNEL__ | |
13 | ||
14 | #ifndef __ASSEMBLY__ | |
15 | #include <asm/types.h> | |
16 | #include <asm/processor.h> | |
17 | #include <asm/arch/thread_info.h> | |
18 | #include <asm/segment.h> | |
19 | #endif | |
20 | ||
21 | ||
22 | /* | |
23 | * low level task data that entry.S needs immediate access to | |
24 | * - this struct should fit entirely inside of one cache line | |
25 | * - this struct shares the supervisor stack pages | |
26 | * - if the contents of this structure are changed, the assembly constants must also be changed | |
27 | */ | |
28 | #ifndef __ASSEMBLY__ | |
29 | struct thread_info { | |
30 | struct task_struct *task; /* main task structure */ | |
31 | struct exec_domain *exec_domain; /* execution domain */ | |
32 | unsigned long flags; /* low level flags */ | |
33 | __u32 cpu; /* current CPU */ | |
34 | __s32 preempt_count; /* 0 => preemptable, <0 => BUG */ | |
35 | ||
36 | mm_segment_t addr_limit; /* thread address space: | |
37 | 0-0xBFFFFFFF for user-thead | |
38 | 0-0xFFFFFFFF for kernel-thread | |
39 | */ | |
40 | struct restart_block restart_block; | |
41 | __u8 supervisor_stack[0]; | |
42 | }; | |
43 | ||
44 | #endif | |
45 | ||
46 | #define PREEMPT_ACTIVE 0x4000000 | |
47 | ||
48 | /* | |
49 | * macros/functions for gaining access to the thread information structure | |
50 | * | |
51 | * preempt_count needs to be 1 initially, until the scheduler is functional. | |
52 | */ | |
53 | #ifndef __ASSEMBLY__ | |
54 | #define INIT_THREAD_INFO(tsk) \ | |
55 | { \ | |
56 | .task = &tsk, \ | |
57 | .exec_domain = &default_exec_domain, \ | |
58 | .flags = 0, \ | |
59 | .cpu = 0, \ | |
60 | .preempt_count = 1, \ | |
61 | .addr_limit = KERNEL_DS, \ | |
62 | .restart_block = { \ | |
63 | .fn = do_no_restart_syscall, \ | |
64 | }, \ | |
65 | } | |
66 | ||
67 | #define init_thread_info (init_thread_union.thread_info) | |
68 | ||
69 | /* thread information allocation */ | |
70 | #define alloc_thread_info(tsk) ((struct thread_info *) __get_free_pages(GFP_KERNEL,1)) | |
71 | #define free_thread_info(ti) free_pages((unsigned long) (ti), 1) | |
72 | #define get_thread_info(ti) get_task_struct((ti)->task) | |
73 | #define put_thread_info(ti) put_task_struct((ti)->task) | |
74 | ||
75 | #endif /* !__ASSEMBLY__ */ | |
76 | ||
77 | /* | |
78 | * thread information flags | |
79 | * - these are process state flags that various assembly files may need to access | |
80 | * - pending work-to-be-done flags are in LSW | |
81 | * - other flags in MSW | |
82 | */ | |
83 | #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ | |
84 | #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ | |
85 | #define TIF_SIGPENDING 2 /* signal pending */ | |
86 | #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ | |
87 | #define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */ | |
88 | #define TIF_MEMDIE 17 | |
89 | ||
90 | #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) | |
91 | #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) | |
92 | #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) | |
93 | #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) | |
94 | #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) | |
95 | ||
96 | #define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */ | |
97 | #define _TIF_ALLWORK_MASK 0x0000FFFF /* work to do on any return to u-space */ | |
98 | ||
99 | #endif /* __KERNEL__ */ | |
100 | ||
101 | #endif /* _ASM_THREAD_INFO_H */ |