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 mm_segment_t addr_limit; /* user-level address space limit */
30 int preempt_count; /* 0=premptable, <0=BUG; will also serve as bh-counter */
31 struct restart_block restart_block;
32 struct {
33 int signo;
34 int code;
35 void __user *addr;
36 unsigned long start_time;
37 pid_t pid;
38 } sigdelayed; /* Saved information for TIF_SIGDELAYED */
39};
40
41#define THREAD_SIZE KERNEL_STACK_SIZE
42
43#define INIT_THREAD_INFO(tsk) \
44{ \
45 .task = &tsk, \
46 .exec_domain = &default_exec_domain, \
47 .flags = 0, \
48 .cpu = 0, \
49 .addr_limit = KERNEL_DS, \
50 .preempt_count = 0, \
51 .restart_block = { \
52 .fn = do_no_restart_syscall, \
53 }, \
54}
55
56#ifndef ASM_OFFSETS_C
57/* how to get the thread information struct from C */
58#define current_thread_info() ((struct thread_info *) ((char *) current + IA64_TASK_SIZE))
59#define alloc_thread_info(tsk) ((struct thread_info *) ((char *) (tsk) + IA64_TASK_SIZE))
60#else
61#define current_thread_info() ((struct thread_info *) 0)
62#define alloc_thread_info(tsk) ((struct thread_info *) 0)
63#endif
64#define free_thread_info(ti) /* nothing */
65
66#define __HAVE_ARCH_TASK_STRUCT_ALLOCATOR
67#define alloc_task_struct() ((task_t *)__get_free_pages(GFP_KERNEL, KERNEL_STACK_SIZE_ORDER))
68#define free_task_struct(tsk) free_pages((unsigned long) (tsk), KERNEL_STACK_SIZE_ORDER)
69
70#endif /* !__ASSEMBLY */
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 least-significant 16 bits, other flags
76 * in top 16 bits
77 */
78#define TIF_NOTIFY_RESUME 0 /* resumption notification requested */
79#define TIF_SIGPENDING 1 /* signal pending */
80#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
81#define TIF_SYSCALL_TRACE 3 /* syscall trace active */
82#define TIF_SYSCALL_AUDIT 4 /* syscall auditing active */
83#define TIF_SIGDELAYED 5 /* signal delayed from MCA/INIT/NMI/PMI context */
84#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */
85#define TIF_MEMDIE 17
86#define TIF_MCA_INIT 18 /* this task is processing MCA or INIT */
87
88#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
89#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
90#define _TIF_SYSCALL_TRACEAUDIT (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)
91#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
92#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
93#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
94#define _TIF_SIGDELAYED (1 << TIF_SIGDELAYED)
95#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
96#define _TIF_MCA_INIT (1 << TIF_MCA_INIT)
97
98/* "work to do on user-return" bits */
99#define TIF_ALLWORK_MASK (_TIF_NOTIFY_RESUME|_TIF_SIGPENDING|_TIF_NEED_RESCHED|_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SIGDELAYED)
100/* like TIF_ALLWORK_BITS but sans TIF_SYSCALL_TRACE or TIF_SYSCALL_AUDIT */
101#define TIF_WORK_MASK (TIF_ALLWORK_MASK&~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT))
102
103#endif /* _ASM_IA64_THREAD_INFO_H */