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
26 struct 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 PREEMPT_ACTIVE 0x4000000
39
40 #define INIT_THREAD_INFO(tsk) \
41 { \
42 .task = &tsk, \
43 .exec_domain = &default_exec_domain, \
44 .addr_limit = KERNEL_DS, \
45 .preempt_count = INIT_PREEMPT_COUNT, \
46 .restart_block = { \
47 .fn = do_no_restart_syscall, \
48 }, \
49 }
50
51 #define init_stack (init_thread_union.stack)
52
53 #ifndef __ASSEMBLY__
54 /* how to get the thread information struct from C */
current_thread_info(void)55 static inline struct thread_info *current_thread_info(void)
56 {
57 struct thread_info *ti;
58 __asm__(
59 "move.l %%sp, %0 \n\t"
60 "and.l %1, %0"
61 : "=&d"(ti)
62 : "di" (~(THREAD_SIZE-1))
63 );
64 return ti;
65 }
66 #endif
67
68 #define init_thread_info (init_thread_union.thread_info)
69
70 /* entry.S relies on these definitions!
71 * bits 0-7 are tested at every exception exit
72 * bits 8-15 are also tested at syscall exit
73 */
74 #define TIF_SIGPENDING 6 /* signal pending */
75 #define TIF_NEED_RESCHED 7 /* rescheduling necessary */
76 #define TIF_DELAYED_TRACE 14 /* single step a syscall */
77 #define TIF_SYSCALL_TRACE 15 /* syscall trace active */
78 #define TIF_MEMDIE 16 /* is terminating due to OOM killer */
79 #define TIF_RESTORE_SIGMASK 18 /* restore signal mask in do_signal */
80
81 #endif /* _ASM_M68K_THREAD_INFO_H */
82