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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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#include <asm/offsets.h>
9#include <asm/processor.h>
10#include <asm/ptrace.h>
11
12#define PREEMPT_ACTIVE_BIT 30
13#define PREEMPT_ACTIVE (1 << PREEMPT_ACTIVE_BIT)
14
15#ifndef __ASSEMBLY__
16
17/*
18 * On IA-64, we want to keep the task structure and kernel stack together, so they can be
19 * mapped by a single TLB entry and so they can be addressed by the "current" pointer
20 * without having to do pointer masking.
21 */
22struct thread_info {
23 struct task_struct *task; /* XXX not really needed, except for dup_task_struct() */
24 struct exec_domain *exec_domain;/* execution domain */
25 __u32 flags; /* thread_info flags (see TIF_*) */
26 __u32 cpu; /* current CPU */
27 mm_segment_t addr_limit; /* user-level address space limit */
28 __s32 preempt_count; /* 0=premptable, <0=BUG; will also serve as bh-counter */
29 struct restart_block restart_block;
30 struct {
31 int signo;
32 int code;
33 void __user *addr;
34 unsigned long start_time;
35 pid_t pid;
36 } sigdelayed; /* Saved information for TIF_SIGDELAYED */
37};
38
39#define THREAD_SIZE KERNEL_STACK_SIZE
40
41#define INIT_THREAD_INFO(tsk) \
42{ \
43 .task = &tsk, \
44 .exec_domain = &default_exec_domain, \
45 .flags = 0, \
46 .cpu = 0, \
47 .addr_limit = KERNEL_DS, \
48 .preempt_count = 0, \
49 .restart_block = { \
50 .fn = do_no_restart_syscall, \
51 }, \
52}
53
54/* how to get the thread information struct from C */
55#define current_thread_info() ((struct thread_info *) ((char *) current + IA64_TASK_SIZE))
56#define alloc_thread_info(tsk) ((struct thread_info *) ((char *) (tsk) + IA64_TASK_SIZE))
57#define free_thread_info(ti) /* nothing */
58
59#define __HAVE_ARCH_TASK_STRUCT_ALLOCATOR
60#define alloc_task_struct() ((task_t *)__get_free_pages(GFP_KERNEL, KERNEL_STACK_SIZE_ORDER))
61#define free_task_struct(tsk) free_pages((unsigned long) (tsk), KERNEL_STACK_SIZE_ORDER)
62
63#endif /* !__ASSEMBLY */
64
65/*
66 * thread information flags
67 * - these are process state flags that various assembly files may need to access
68 * - pending work-to-be-done flags are in least-significant 16 bits, other flags
69 * in top 16 bits
70 */
71#define TIF_NOTIFY_RESUME 0 /* resumption notification requested */
72#define TIF_SIGPENDING 1 /* signal pending */
73#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
74#define TIF_SYSCALL_TRACE 3 /* syscall trace active */
75#define TIF_SYSCALL_AUDIT 4 /* syscall auditing active */
76#define TIF_SIGDELAYED 5 /* signal delayed from MCA/INIT/NMI/PMI context */
77#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */
78#define TIF_MEMDIE 17
79
80#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
81#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
82#define _TIF_SYSCALL_TRACEAUDIT (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)
83#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
84#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
85#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
86#define _TIF_SIGDELAYED (1 << TIF_SIGDELAYED)
87#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
88
89/* "work to do on user-return" bits */
90#define TIF_ALLWORK_MASK (_TIF_NOTIFY_RESUME|_TIF_SIGPENDING|_TIF_NEED_RESCHED|_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SIGDELAYED)
91/* like TIF_ALLWORK_BITS but sans TIF_SYSCALL_TRACE or TIF_SYSCALL_AUDIT */
92#define TIF_WORK_MASK (TIF_ALLWORK_MASK&~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT))
93
94#endif /* _ASM_IA64_THREAD_INFO_H */