1 /* thread_info.h: m68knommu low-level thread information
2 * adapted from the i386 and PPC versions by Greg Ungerer (gerg@snapgear.com)
4 * Copyright (C) 2002 David Howells (dhowells@redhat.com)
5 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
8 #ifndef _ASM_THREAD_INFO_H
9 #define _ASM_THREAD_INFO_H
16 * Size of kernel stack for each process. This must be a power of 2...
18 #ifdef CONFIG_4KSTACKS
19 #define THREAD_SIZE_ORDER (0)
21 #define THREAD_SIZE_ORDER (1)
25 * for asm files, THREAD_SIZE is now generated by asm-offsets.c
27 #define THREAD_SIZE (PAGE_SIZE<<THREAD_SIZE_ORDER)
32 * low level task data.
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 unsigned long tp_value; /* thread pointer */
41 struct restart_block restart_block;
45 * macros/functions for gaining access to the thread information structure
47 #define INIT_THREAD_INFO(tsk) \
50 .exec_domain = &default_exec_domain, \
53 .preempt_count = INIT_PREEMPT_COUNT, \
55 .fn = do_no_restart_syscall, \
59 #define init_thread_info (init_thread_union.thread_info)
60 #define init_stack (init_thread_union.stack)
63 /* how to get the thread information struct from C */
64 static inline struct thread_info *current_thread_info(void)
66 struct thread_info *ti;
68 "move.l %%sp, %0 \n\t"
71 : "di" (~(THREAD_SIZE-1))
76 #endif /* __ASSEMBLY__ */
78 #define PREEMPT_ACTIVE 0x4000000
81 * thread information flag bit numbers
83 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
84 #define TIF_SIGPENDING 1 /* signal pending */
85 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */
86 #define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling
88 #define TIF_MEMDIE 4 /* is terminating due to OOM killer */
89 #define TIF_FREEZE 16 /* is freezing for suspend */
91 /* as above, but as bit values */
92 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
93 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
94 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
95 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
96 #define _TIF_FREEZE (1<<TIF_FREEZE)
98 #define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */
100 #endif /* __KERNEL__ */
102 #endif /* _ASM_THREAD_INFO_H */