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1/* thread_info.h: CRIS low-level thread information
2 *
3 * Copyright (C) 2002 David Howells (dhowells@redhat.com)
4 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
5 *
6 * CRIS port by Axis Communications
7 */
8
9#ifndef _ASM_THREAD_INFO_H
10#define _ASM_THREAD_INFO_H
11
12#ifdef __KERNEL__
13
14#ifndef __ASSEMBLY__
15#include <asm/types.h>
16#include <asm/processor.h>
17#include <asm/arch/thread_info.h>
18#include <asm/segment.h>
19#endif
20
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 must also be changed
27 */
28#ifndef __ASSEMBLY__
29struct thread_info {
30 struct task_struct *task; /* main task structure */
31 struct exec_domain *exec_domain; /* execution domain */
32 unsigned long flags; /* low level flags */
33 __u32 cpu; /* current CPU */
34 int preempt_count; /* 0 => preemptable, <0 => BUG */
35
36 mm_segment_t addr_limit; /* thread address space:
37 0-0xBFFFFFFF for user-thead
38 0-0xFFFFFFFF for kernel-thread
39 */
40 struct restart_block restart_block;
41 __u8 supervisor_stack[0];
42};
43
44#endif
45
46#define PREEMPT_ACTIVE 0x10000000
47
48/*
49 * macros/functions for gaining access to the thread information structure
50 *
51 * preempt_count needs to be 1 initially, until the scheduler is functional.
52 */
53#ifndef __ASSEMBLY__
54#define INIT_THREAD_INFO(tsk) \
55{ \
56 .task = &tsk, \
57 .exec_domain = &default_exec_domain, \
58 .flags = 0, \
59 .cpu = 0, \
60 .preempt_count = 1, \
61 .addr_limit = KERNEL_DS, \
62 .restart_block = { \
63 .fn = do_no_restart_syscall, \
64 }, \
65}
66
67#define init_thread_info (init_thread_union.thread_info)
68
69/* thread information allocation */
70#define alloc_thread_info(tsk) ((struct thread_info *) __get_free_pages(GFP_KERNEL,1))
71#define free_thread_info(ti) free_pages((unsigned long) (ti), 1)
72
73#endif /* !__ASSEMBLY__ */
74
75/*
76 * thread information flags
77 * - these are process state flags that various assembly files may need to access
78 * - pending work-to-be-done flags are in LSW
79 * - other flags in MSW
80 */
81#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
82#define TIF_SIGPENDING 1 /* signal pending */
83#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
84#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */
85#define TIF_MEMDIE 17
86
87#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
88#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
89#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
90#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
91
92#define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */
93#define _TIF_ALLWORK_MASK 0x0000FFFF /* work to do on any return to u-space */
94
95#endif /* __KERNEL__ */
96
97#endif /* _ASM_THREAD_INFO_H */