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 */
39 int preempt_count; /* 0 => preemptable, <0 => BUG */
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 */
current_thread_info(void)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 #endif /* __ASSEMBLY__ */
75
76 #define PREEMPT_ACTIVE 0x4000000
77
78 /*
79 * thread information flag bit numbers
80 */
81 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
82 #define TIF_SIGPENDING 1 /* signal pending */
83 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */
84 #define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling
85 TIF_NEED_RESCHED */
86 #define TIF_MEMDIE 4
87 #define TIF_FREEZE 16 /* is freezing for suspend */
88
89 /* as above, but as bit values */
90 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
91 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
92 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
93 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
94 #define _TIF_FREEZE (1<<TIF_FREEZE)
95
96 #define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */
97
98 #endif /* __KERNEL__ */
99
100 #endif /* _ASM_THREAD_INFO_H */
101