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1da177e4 LT |
1 | /* thread_info.h: m68knommu low-level thread information |
2 | * adapted from the i386 and PPC versions by Greg Ungerer (gerg@snapgear.com) | |
3 | * | |
4 | * Copyright (C) 2002 David Howells (dhowells@redhat.com) | |
5 | * - Incorporating suggestions made by Linus Torvalds and Dave Miller | |
6 | */ | |
7 | ||
8 | #ifndef _ASM_THREAD_INFO_H | |
9 | #define _ASM_THREAD_INFO_H | |
10 | ||
11 | #include <asm/page.h> | |
12 | ||
13 | #ifdef __KERNEL__ | |
14 | ||
15 | #ifndef __ASSEMBLY__ | |
16 | ||
17 | /* | |
18 | * Size of kernel stack for each process. This must be a power of 2... | |
19 | */ | |
20 | #ifdef CONFIG_4KSTACKS | |
21 | #define THREAD_SIZE_ORDER (0) | |
22 | #else | |
23 | #define THREAD_SIZE_ORDER (1) | |
24 | #endif | |
25 | ||
26 | /* | |
27 | * for asm files, THREAD_SIZE is now generated by asm-offsets.c | |
28 | */ | |
29 | #define THREAD_SIZE (PAGE_SIZE<<THREAD_SIZE_ORDER) | |
30 | ||
31 | /* | |
32 | * low level task data. | |
33 | */ | |
34 | struct thread_info { | |
35 | struct task_struct *task; /* main task structure */ | |
36 | struct exec_domain *exec_domain; /* execution domain */ | |
37 | unsigned long flags; /* low level flags */ | |
38 | int cpu; /* cpu we're on */ | |
dcd497f9 | 39 | int preempt_count; /* 0 => preemptable, <0 => BUG */ |
1da177e4 LT |
40 | struct restart_block restart_block; |
41 | }; | |
42 | ||
43 | /* | |
44 | * macros/functions for gaining access to the thread information structure | |
45 | */ | |
46 | #define INIT_THREAD_INFO(tsk) \ | |
47 | { \ | |
48 | .task = &tsk, \ | |
49 | .exec_domain = &default_exec_domain, \ | |
50 | .flags = 0, \ | |
51 | .cpu = 0, \ | |
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 | ||
61 | /* how to get the thread information struct from C */ | |
62 | static inline struct thread_info *current_thread_info(void) | |
63 | { | |
64 | struct thread_info *ti; | |
65 | __asm__( | |
66 | "move.l %%sp, %0 \n\t" | |
67 | "and.l %1, %0" | |
68 | : "=&d"(ti) | |
69 | : "di" (~(THREAD_SIZE-1)) | |
70 | ); | |
71 | return ti; | |
72 | } | |
73 | ||
74 | /* thread information allocation */ | |
75 | #define alloc_thread_info(tsk) ((struct thread_info *) \ | |
76 | __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER)) | |
77 | #define free_thread_info(ti) free_pages((unsigned long) (ti), THREAD_SIZE_ORDER) | |
78 | #define get_thread_info(ti) get_task_struct((ti)->task) | |
79 | #define put_thread_info(ti) put_task_struct((ti)->task) | |
80 | #endif /* __ASSEMBLY__ */ | |
81 | ||
82 | #define PREEMPT_ACTIVE 0x4000000 | |
83 | ||
84 | /* | |
85 | * thread information flag bit numbers | |
86 | */ | |
87 | #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ | |
88 | #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ | |
89 | #define TIF_SIGPENDING 2 /* signal pending */ | |
90 | #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ | |
91 | #define TIF_POLLING_NRFLAG 4 /* true if poll_idle() is polling | |
92 | TIF_NEED_RESCHED */ | |
93 | #define TIF_MEMDIE 5 | |
94 | ||
95 | /* as above, but as bit values */ | |
96 | #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) | |
97 | #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) | |
98 | #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) | |
99 | #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) | |
100 | #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) | |
101 | ||
102 | #define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */ | |
103 | ||
104 | #endif /* __KERNEL__ */ | |
105 | ||
106 | #endif /* _ASM_THREAD_INFO_H */ |