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1#ifndef __ASM_SH_THREAD_INFO_H
2#define __ASM_SH_THREAD_INFO_H
3
4/* SuperH version
5 * Copyright (C) 2002 Niibe Yutaka
6 *
7 * The copyright of original i386 version is:
8 *
9 * Copyright (C) 2002 David Howells (dhowells@redhat.com)
10 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
11 */
12
13#ifdef __KERNEL__
14
15#ifndef __ASSEMBLY__
16#include <asm/processor.h>
17
18struct thread_info {
19 struct task_struct *task; /* main task structure */
20 struct exec_domain *exec_domain; /* execution domain */
21 __u32 flags; /* low level flags */
22 __u32 cpu;
23 int preempt_count; /* 0 => preemptable, <0 => BUG */
24 struct restart_block restart_block;
25 __u8 supervisor_stack[0];
26};
27
28#endif
29
30#define PREEMPT_ACTIVE 0x10000000
31
32/*
33 * macros/functions for gaining access to the thread information structure
34 */
35#ifndef __ASSEMBLY__
36#define INIT_THREAD_INFO(tsk) \
37{ \
38 .task = &tsk, \
39 .exec_domain = &default_exec_domain, \
40 .flags = 0, \
41 .cpu = 0, \
42 .preempt_count = 1, \
43 .restart_block = { \
44 .fn = do_no_restart_syscall, \
45 }, \
46}
47
48#define init_thread_info (init_thread_union.thread_info)
49#define init_stack (init_thread_union.stack)
50
51/* how to get the thread information struct from C */
52static inline struct thread_info *current_thread_info(void)
53{
54 struct thread_info *ti;
55 __asm__("stc r7_bank, %0" : "=r" (ti));
56 return ti;
57}
58
59/* thread information allocation */
60#define THREAD_SIZE (2*PAGE_SIZE)
61#define alloc_thread_info(ti) ((struct thread_info *) __get_free_pages(GFP_KERNEL,1))
62#define free_thread_info(ti) free_pages((unsigned long) (ti), 1)
63
64#else /* !__ASSEMBLY__ */
65
66/* how to get the thread information struct from ASM */
67#define GET_THREAD_INFO(reg) \
68 stc r7_bank, reg
69
70#endif
71
72/*
73 * thread information flags
74 * - these are process state flags that various assembly files may need to access
75 * - pending work-to-be-done flags are in LSW
76 * - other flags in MSW
77 */
78#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
79#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
80#define TIF_SIGPENDING 2 /* signal pending */
81#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
82#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
83#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */
84#define TIF_MEMDIE 18
85#define TIF_USERSPACE 31 /* true if FS sets userspace */
86
87#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
88#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
89#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
90#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
91#define _TIF_USEDFPU (1<<TIF_USEDFPU)
92#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
93#define _TIF_USERSPACE (1<<TIF_USERSPACE)
94
95#define _TIF_WORK_MASK 0x000000FE /* work to do on interrupt/exception return */
96#define _TIF_ALLWORK_MASK 0x000000FF /* work to do on any return to u-space */
97
98#endif /* __KERNEL__ */
99
100#endif /* __ASM_SH_THREAD_INFO_H */