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#ifndef __ASSEMBLY__
15
16/*
17 * On IA-64, we want to keep the task structure and kernel stack together, so they can be
18 * mapped by a single TLB entry and so they can be addressed by the "current" pointer
19 * without having to do pointer masking.
20 */
21struct thread_info {
22 struct task_struct *task; /* XXX not really needed, except for dup_task_struct() */
23 struct exec_domain *exec_domain;/* execution domain */
24 __u32 flags; /* thread_info flags (see TIF_*) */
25 __u32 cpu; /* current CPU */
26 __u32 last_cpu; /* Last CPU thread ran on */
27 __u32 status; /* Thread synchronous flags */
28 mm_segment_t addr_limit; /* user-level address space limit */
29 int preempt_count; /* 0=premptable, <0=BUG; will also serve as bh-counter */
30#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
31 __u64 ac_stamp;
32 __u64 ac_leave;
33 __u64 ac_stime;
34 __u64 ac_utime;
35#endif
36};
37
38#define THREAD_SIZE KERNEL_STACK_SIZE
39
40#define INIT_THREAD_INFO(tsk) \
41{ \
42 .task = &tsk, \
43 .exec_domain = &default_exec_domain, \
44 .flags = 0, \
45 .cpu = 0, \
46 .addr_limit = KERNEL_DS, \
47 .preempt_count = INIT_PREEMPT_COUNT, \
48}
49
50#ifndef ASM_OFFSETS_C
51/* how to get the thread information struct from C */
52#define current_thread_info() ((struct thread_info *) ((char *) current + IA64_TASK_SIZE))
53#define alloc_thread_info_node(tsk, node) \
54 ((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_node(tsk, node) ((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#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
66#define setup_thread_stack(p, org) \
67 *task_thread_info(p) = *task_thread_info(org); \
68 task_thread_info(p)->ac_stime = 0; \
69 task_thread_info(p)->ac_utime = 0; \
70 task_thread_info(p)->task = (p);
71#else
72#define setup_thread_stack(p, org) \
73 *task_thread_info(p) = *task_thread_info(org); \
74 task_thread_info(p)->task = (p);
75#endif
76#define end_of_stack(p) (unsigned long *)((void *)(p) + IA64_RBS_OFFSET)
77
78#define alloc_task_struct_node(node) \
79({ \
80 struct page *page = alloc_pages_node(node, GFP_KERNEL | __GFP_COMP, \
81 KERNEL_STACK_SIZE_ORDER); \
82 struct task_struct *ret = page ? page_address(page) : NULL; \
83 \
84 ret; \
85})
86#define free_task_struct(tsk) free_pages((unsigned long) (tsk), KERNEL_STACK_SIZE_ORDER)
87
88#endif /* !__ASSEMBLY */
89
90/*
91 * thread information flags
92 * - these are process state flags that various assembly files may need to access
93 * - pending work-to-be-done flags are in least-significant 16 bits, other flags
94 * in top 16 bits
95 */
96#define TIF_SIGPENDING 0 /* signal pending */
97#define TIF_NEED_RESCHED 1 /* rescheduling necessary */
98#define TIF_SYSCALL_TRACE 2 /* syscall trace active */
99#define TIF_SYSCALL_AUDIT 3 /* syscall auditing active */
100#define TIF_SINGLESTEP 4 /* restore singlestep on return to user mode */
101#define TIF_NOTIFY_RESUME 6 /* resumption notification requested */
102#define TIF_MEMDIE 17 /* is terminating due to OOM killer */
103#define TIF_MCA_INIT 18 /* this task is processing MCA or INIT */
104#define TIF_DB_DISABLED 19 /* debug trap disabled for fsyscall */
105#define TIF_RESTORE_RSE 21 /* user RBS is newer than kernel RBS */
106#define TIF_POLLING_NRFLAG 22 /* idle is polling for TIF_NEED_RESCHED */
107
108#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
109#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
110#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
111#define _TIF_SYSCALL_TRACEAUDIT (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP)
112#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
113#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
114#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
115#define _TIF_MCA_INIT (1 << TIF_MCA_INIT)
116#define _TIF_DB_DISABLED (1 << TIF_DB_DISABLED)
117#define _TIF_RESTORE_RSE (1 << TIF_RESTORE_RSE)
118#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
119
120/* "work to do on user-return" bits */
121#define TIF_ALLWORK_MASK (_TIF_SIGPENDING|_TIF_NOTIFY_RESUME|_TIF_SYSCALL_AUDIT|\
122 _TIF_NEED_RESCHED|_TIF_SYSCALL_TRACE)
123/* like TIF_ALLWORK_BITS but sans TIF_SYSCALL_TRACE or TIF_SYSCALL_AUDIT */
124#define TIF_WORK_MASK (TIF_ALLWORK_MASK&~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT))
125
126#define TS_RESTORE_SIGMASK 2 /* restore signal mask in do_signal() */
127
128#ifndef __ASSEMBLY__
129#define HAVE_SET_RESTORE_SIGMASK 1
130static inline void set_restore_sigmask(void)
131{
132 struct thread_info *ti = current_thread_info();
133 ti->status |= TS_RESTORE_SIGMASK;
134 WARN_ON(!test_bit(TIF_SIGPENDING, &ti->flags));
135}
136static inline void clear_restore_sigmask(void)
137{
138 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
139}
140static inline bool test_restore_sigmask(void)
141{
142 return current_thread_info()->status & TS_RESTORE_SIGMASK;
143}
144static inline bool test_and_clear_restore_sigmask(void)
145{
146 struct thread_info *ti = current_thread_info();
147 if (!(ti->status & TS_RESTORE_SIGMASK))
148 return false;
149 ti->status &= ~TS_RESTORE_SIGMASK;
150 return true;
151}
152#endif /* !__ASSEMBLY__ */
153
154#endif /* _ASM_IA64_THREAD_INFO_H */