1 /* thread_info.h: h8300 low-level thread information
2 * adapted from the i386 and PPC versions by Yoshinori Sato <ysato@users.sourceforge.jp>
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 * low level task data.
19 * If you change this, change the TI_* offsets below to match.
20 */
21 struct thread_info {
22 struct task_struct *task; /* main task structure */
23 struct exec_domain *exec_domain; /* execution domain */
24 unsigned long flags; /* low level flags */
25 int cpu; /* cpu we're on */
26 int preempt_count; /* 0 => preemptable, <0 => BUG */
27 struct restart_block restart_block;
28 };
29
30 /*
31 * macros/functions for gaining access to the thread information structure
32 */
33 #define INIT_THREAD_INFO(tsk) \
34 { \
35 .task = &tsk, \
36 .exec_domain = &default_exec_domain, \
37 .flags = 0, \
38 .cpu = 0, \
39 .preempt_count = INIT_PREEMPT_COUNT, \
40 .restart_block = { \
41 .fn = do_no_restart_syscall, \
42 }, \
43 }
44
45 #define init_thread_info (init_thread_union.thread_info)
46 #define init_stack (init_thread_union.stack)
47
48
49 /*
50 * Size of kernel stack for each process. This must be a power of 2...
51 */
52 #define THREAD_SIZE_ORDER 1
53 #define THREAD_SIZE 8192 /* 2 pages */
54
55
56 /* how to get the thread information struct from C */
current_thread_info(void)57 static inline struct thread_info *current_thread_info(void)
58 {
59 struct thread_info *ti;
60 __asm__(
61 "mov.l sp, %0 \n\t"
62 "and.l %1, %0"
63 : "=&r"(ti)
64 : "i" (~(THREAD_SIZE-1))
65 );
66 return ti;
67 }
68
69 #endif /* __ASSEMBLY__ */
70
71 /*
72 * Offsets in thread_info structure, used in assembly code
73 */
74 #define TI_TASK 0
75 #define TI_EXECDOMAIN 4
76 #define TI_FLAGS 8
77 #define TI_CPU 12
78 #define TI_PRE_COUNT 16
79
80 #define PREEMPT_ACTIVE 0x4000000
81
82 /*
83 * thread information flag bit numbers
84 */
85 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
86 #define TIF_SIGPENDING 1 /* signal pending */
87 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */
88 #define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling
89 TIF_NEED_RESCHED */
90 #define TIF_MEMDIE 4 /* is terminating due to OOM killer */
91 #define TIF_RESTORE_SIGMASK 5 /* restore signal mask in do_signal() */
92 #define TIF_NOTIFY_RESUME 6 /* callback before returning to user */
93
94 /* as above, but as bit values */
95 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
96 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
97 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
98 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
99 #define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
100 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
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 */
107