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1#ifndef _ASM_M68K_THREAD_INFO_H
2#define _ASM_M68K_THREAD_INFO_H
3
4#include <asm/types.h>
5#include <asm/page.h>
6#include <asm/segment.h>
7
8/*
9 * On machines with 4k pages we default to an 8k thread size, though we
10 * allow a 4k with config option. Any other machine page size then
11 * the thread size must match the page size (which is 8k and larger here).
12 */
13#if PAGE_SHIFT < 13
14#ifdef CONFIG_4KSTACKS
15#define THREAD_SIZE 4096
16#else
17#define THREAD_SIZE 8192
18#endif
19#else
20#define THREAD_SIZE PAGE_SIZE
21#endif
22#define THREAD_SIZE_ORDER ((THREAD_SIZE / PAGE_SIZE) - 1)
23
24#ifndef __ASSEMBLY__
25
26struct thread_info {
27 struct task_struct *task; /* main task structure */
28 unsigned long flags;
29 struct exec_domain *exec_domain; /* execution domain */
30 mm_segment_t addr_limit; /* thread address space */
31 int preempt_count; /* 0 => preemptable, <0 => BUG */
32 __u32 cpu; /* should always be 0 on m68k */
33 unsigned long tp_value; /* thread pointer */
34 struct restart_block restart_block;
35};
36#endif /* __ASSEMBLY__ */
37
38#define INIT_THREAD_INFO(tsk) \
39{ \
40 .task = &tsk, \
41 .exec_domain = &default_exec_domain, \
42 .addr_limit = KERNEL_DS, \
43 .preempt_count = INIT_PREEMPT_COUNT, \
44 .restart_block = { \
45 .fn = do_no_restart_syscall, \
46 }, \
47}
48
49#define init_stack (init_thread_union.stack)
50
51#ifndef __ASSEMBLY__
52/* how to get the thread information struct from C */
53static inline struct thread_info *current_thread_info(void)
54{
55 struct thread_info *ti;
56 __asm__(
57 "move.l %%sp, %0 \n\t"
58 "and.l %1, %0"
59 : "=&d"(ti)
60 : "di" (~(THREAD_SIZE-1))
61 );
62 return ti;
63}
64#endif
65
66#define init_thread_info (init_thread_union.thread_info)
67
68/* entry.S relies on these definitions!
69 * bits 0-7 are tested at every exception exit
70 * bits 8-15 are also tested at syscall exit
71 */
72#define TIF_NOTIFY_RESUME 5 /* callback before returning to user */
73#define TIF_SIGPENDING 6 /* signal pending */
74#define TIF_NEED_RESCHED 7 /* rescheduling necessary */
75#define TIF_DELAYED_TRACE 14 /* single step a syscall */
76#define TIF_SYSCALL_TRACE 15 /* syscall trace active */
77#define TIF_MEMDIE 16 /* is terminating due to OOM killer */
78#define TIF_RESTORE_SIGMASK 18 /* restore signal mask in do_signal */
79
80#endif /* _ASM_M68K_THREAD_INFO_H */