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Linux kernel mirror (for testing)
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linux
1/*
2 * Copyright (C) 2002-2003 Hewlett-Packard Co
3 * David Mosberger-Tang <davidm@hpl.hp.com>
4 */
5#ifndef _ASM_IA64_THREAD_INFO_H
6#define _ASM_IA64_THREAD_INFO_H
7
8#ifndef ASM_OFFSETS_C
9#include <asm/asm-offsets.h>
10#endif
11#include <asm/processor.h>
12#include <asm/ptrace.h>
13
14#define PREEMPT_ACTIVE_BIT 30
15#define PREEMPT_ACTIVE (1 << PREEMPT_ACTIVE_BIT)
16
17#ifndef __ASSEMBLY__
18
19/*
20 * On IA-64, we want to keep the task structure and kernel stack together, so they can be
21 * mapped by a single TLB entry and so they can be addressed by the "current" pointer
22 * without having to do pointer masking.
23 */
24struct thread_info {
25 struct task_struct *task; /* XXX not really needed, except for dup_task_struct() */
26 struct exec_domain *exec_domain;/* execution domain */
27 __u32 flags; /* thread_info flags (see TIF_*) */
28 __u32 cpu; /* current CPU */
29 __u32 last_cpu; /* Last CPU thread ran on */
30 __u32 status; /* Thread synchronous flags */
31 mm_segment_t addr_limit; /* user-level address space limit */
32 int preempt_count; /* 0=premptable, <0=BUG; will also serve as bh-counter */
33 struct restart_block restart_block;
34};
35
36#define THREAD_SIZE KERNEL_STACK_SIZE
37
38#define INIT_THREAD_INFO(tsk) \
39{ \
40 .task = &tsk, \
41 .exec_domain = &default_exec_domain, \
42 .flags = 0, \
43 .cpu = 0, \
44 .addr_limit = KERNEL_DS, \
45 .preempt_count = 0, \
46 .restart_block = { \
47 .fn = do_no_restart_syscall, \
48 }, \
49}
50
51#ifndef ASM_OFFSETS_C
52/* how to get the thread information struct from C */
53#define current_thread_info() ((struct thread_info *) ((char *) current + IA64_TASK_SIZE))
54#define alloc_thread_info(tsk) ((struct thread_info *) ((char *) (tsk) + IA64_TASK_SIZE))
55#define task_thread_info(tsk) ((struct thread_info *) ((char *) (tsk) + IA64_TASK_SIZE))
56#else
57#define current_thread_info() ((struct thread_info *) 0)
58#define alloc_thread_info(tsk) ((struct thread_info *) 0)
59#define task_thread_info(tsk) ((struct thread_info *) 0)
60#endif
61#define free_thread_info(ti) /* nothing */
62#define task_stack_page(tsk) ((void *)(tsk))
63
64#define __HAVE_THREAD_FUNCTIONS
65#define setup_thread_stack(p, org) \
66 *task_thread_info(p) = *task_thread_info(org); \
67 task_thread_info(p)->task = (p);
68#define end_of_stack(p) (unsigned long *)((void *)(p) + IA64_RBS_OFFSET)
69
70#define __HAVE_ARCH_TASK_STRUCT_ALLOCATOR
71#define alloc_task_struct() ((struct task_struct *)__get_free_pages(GFP_KERNEL | __GFP_COMP, KERNEL_STACK_SIZE_ORDER))
72#define free_task_struct(tsk) free_pages((unsigned long) (tsk), KERNEL_STACK_SIZE_ORDER)
73
74#define tsk_set_notify_resume(tsk) \
75 set_ti_thread_flag(task_thread_info(tsk), TIF_NOTIFY_RESUME)
76extern void tsk_clear_notify_resume(struct task_struct *tsk);
77#endif /* !__ASSEMBLY */
78
79/*
80 * thread information flags
81 * - these are process state flags that various assembly files may need to access
82 * - pending work-to-be-done flags are in least-significant 16 bits, other flags
83 * in top 16 bits
84 */
85#define TIF_SIGPENDING 0 /* signal pending */
86#define TIF_NEED_RESCHED 1 /* rescheduling necessary */
87#define TIF_SYSCALL_TRACE 2 /* syscall trace active */
88#define TIF_SYSCALL_AUDIT 3 /* syscall auditing active */
89#define TIF_SINGLESTEP 4 /* restore singlestep on return to user mode */
90#define TIF_RESTORE_SIGMASK 5 /* restore signal mask in do_signal() */
91#define TIF_NOTIFY_RESUME 6 /* resumption notification requested */
92#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */
93#define TIF_MEMDIE 17
94#define TIF_MCA_INIT 18 /* this task is processing MCA or INIT */
95#define TIF_DB_DISABLED 19 /* debug trap disabled for fsyscall */
96#define TIF_FREEZE 20 /* is freezing for suspend */
97#define TIF_RESTORE_RSE 21 /* user RBS is newer than kernel RBS */
98
99#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
100#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
101#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
102#define _TIF_SYSCALL_TRACEAUDIT (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP)
103#define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK)
104#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
105#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
106#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
107#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
108#define _TIF_MCA_INIT (1 << TIF_MCA_INIT)
109#define _TIF_DB_DISABLED (1 << TIF_DB_DISABLED)
110#define _TIF_FREEZE (1 << TIF_FREEZE)
111#define _TIF_RESTORE_RSE (1 << TIF_RESTORE_RSE)
112
113/* "work to do on user-return" bits */
114#define TIF_ALLWORK_MASK (_TIF_SIGPENDING|_TIF_NOTIFY_RESUME|_TIF_SYSCALL_AUDIT|\
115 _TIF_NEED_RESCHED| _TIF_SYSCALL_TRACE|\
116 _TIF_RESTORE_SIGMASK)
117/* like TIF_ALLWORK_BITS but sans TIF_SYSCALL_TRACE or TIF_SYSCALL_AUDIT */
118#define TIF_WORK_MASK (TIF_ALLWORK_MASK&~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT))
119
120#define TS_POLLING 1 /* true if in idle loop and not sleeping */
121
122#define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)
123
124#endif /* _ASM_IA64_THREAD_INFO_H */