Linux kernel mirror (for testing)
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1#ifndef _ASM_SCORE_THREAD_INFO_H
2#define _ASM_SCORE_THREAD_INFO_H
3
4#ifdef __KERNEL__
5
6#define KU_MASK 0x08
7#define KU_USER 0x08
8#define KU_KERN 0x00
9
10#include <asm/page.h>
11#include <linux/const.h>
12
13/* thread information allocation */
14#define THREAD_SIZE_ORDER (1)
15#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
16#define THREAD_MASK (THREAD_SIZE - _AC(1,UL))
17
18#ifndef __ASSEMBLY__
19
20#include <asm/processor.h>
21
22/*
23 * low level task data that entry.S needs immediate access to
24 * - this struct should fit entirely inside of one cache line
25 * - this struct shares the supervisor stack pages
26 * - if the contents of this structure are changed, the assembly constants
27 * must also be changed
28 */
29struct thread_info {
30 struct task_struct *task; /* main task structure */
31 unsigned long flags; /* low level flags */
32 unsigned long tp_value; /* thread pointer */
33 __u32 cpu; /* current CPU */
34
35 /* 0 => preemptable, < 0 => BUG */
36 int preempt_count;
37
38 /*
39 * thread address space:
40 * 0-0xBFFFFFFF for user-thead
41 * 0-0xFFFFFFFF for kernel-thread
42 */
43 mm_segment_t addr_limit;
44 struct pt_regs *regs;
45};
46
47/*
48 * macros/functions for gaining access to the thread information structure
49 *
50 * preempt_count needs to be 1 initially, until the scheduler is functional.
51 */
52#define INIT_THREAD_INFO(tsk) \
53{ \
54 .task = &tsk, \
55 .cpu = 0, \
56 .preempt_count = 1, \
57 .addr_limit = KERNEL_DS, \
58}
59
60#define init_thread_info (init_thread_union.thread_info)
61#define init_stack (init_thread_union.stack)
62
63/* How to get the thread information struct from C. */
64register struct thread_info *__current_thread_info __asm__("r28");
65#define current_thread_info() __current_thread_info
66
67#endif /* !__ASSEMBLY__ */
68
69/*
70 * thread information flags
71 * - these are process state flags that various assembly files may need to
72 * access
73 * - pending work-to-be-done flags are in LSW
74 * - other flags in MSW
75 */
76#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
77#define TIF_SIGPENDING 1 /* signal pending */
78#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
79#define TIF_NOTIFY_RESUME 5 /* callback before returning to user */
80#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */
81#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
82
83#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
84#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
85#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
86#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
87
88#define _TIF_WORK_MASK (0x0000ffff)
89
90#endif /* __KERNEL__ */
91
92#endif /* _ASM_SCORE_THREAD_INFO_H */