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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#ifdef CONFIG_VIRT_CPU_ACCOUNTING
35 __u64 ac_stamp;
36 __u64 ac_leave;
37 __u64 ac_stime;
38 __u64 ac_utime;
39#endif
40};
41
42#define THREAD_SIZE KERNEL_STACK_SIZE
43
44#define INIT_THREAD_INFO(tsk) \
45{ \
46 .task = &tsk, \
47 .exec_domain = &default_exec_domain, \
48 .flags = 0, \
49 .cpu = 0, \
50 .addr_limit = KERNEL_DS, \
51 .preempt_count = INIT_PREEMPT_COUNT, \
52 .restart_block = { \
53 .fn = do_no_restart_syscall, \
54 }, \
55}
56
57#ifndef ASM_OFFSETS_C
58/* how to get the thread information struct from C */
59#define current_thread_info() ((struct thread_info *) ((char *) current + IA64_TASK_SIZE))
60#define alloc_thread_info_node(tsk, node) \
61 ((struct thread_info *) ((char *) (tsk) + IA64_TASK_SIZE))
62#define task_thread_info(tsk) ((struct thread_info *) ((char *) (tsk) + IA64_TASK_SIZE))
63#else
64#define current_thread_info() ((struct thread_info *) 0)
65#define alloc_thread_info_node(tsk, node) ((struct thread_info *) 0)
66#define task_thread_info(tsk) ((struct thread_info *) 0)
67#endif
68#define free_thread_info(ti) /* nothing */
69#define task_stack_page(tsk) ((void *)(tsk))
70
71#define __HAVE_THREAD_FUNCTIONS
72#ifdef CONFIG_VIRT_CPU_ACCOUNTING
73#define setup_thread_stack(p, org) \
74 *task_thread_info(p) = *task_thread_info(org); \
75 task_thread_info(p)->ac_stime = 0; \
76 task_thread_info(p)->ac_utime = 0; \
77 task_thread_info(p)->task = (p);
78#else
79#define setup_thread_stack(p, org) \
80 *task_thread_info(p) = *task_thread_info(org); \
81 task_thread_info(p)->task = (p);
82#endif
83#define end_of_stack(p) (unsigned long *)((void *)(p) + IA64_RBS_OFFSET)
84
85#define alloc_task_struct_node(node) \
86({ \
87 struct page *page = alloc_pages_node(node, GFP_KERNEL | __GFP_COMP, \
88 KERNEL_STACK_SIZE_ORDER); \
89 struct task_struct *ret = page ? page_address(page) : NULL; \
90 \
91 ret; \
92})
93#define free_task_struct(tsk) free_pages((unsigned long) (tsk), KERNEL_STACK_SIZE_ORDER)
94
95#endif /* !__ASSEMBLY */
96
97/*
98 * thread information flags
99 * - these are process state flags that various assembly files may need to access
100 * - pending work-to-be-done flags are in least-significant 16 bits, other flags
101 * in top 16 bits
102 */
103#define TIF_SIGPENDING 0 /* signal pending */
104#define TIF_NEED_RESCHED 1 /* rescheduling necessary */
105#define TIF_SYSCALL_TRACE 2 /* syscall trace active */
106#define TIF_SYSCALL_AUDIT 3 /* syscall auditing active */
107#define TIF_SINGLESTEP 4 /* restore singlestep on return to user mode */
108#define TIF_NOTIFY_RESUME 6 /* resumption notification requested */
109#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */
110#define TIF_MEMDIE 17 /* is terminating due to OOM killer */
111#define TIF_MCA_INIT 18 /* this task is processing MCA or INIT */
112#define TIF_DB_DISABLED 19 /* debug trap disabled for fsyscall */
113#define TIF_RESTORE_RSE 21 /* user RBS is newer than kernel RBS */
114
115#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
116#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
117#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
118#define _TIF_SYSCALL_TRACEAUDIT (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP)
119#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
120#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
121#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
122#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
123#define _TIF_MCA_INIT (1 << TIF_MCA_INIT)
124#define _TIF_DB_DISABLED (1 << TIF_DB_DISABLED)
125#define _TIF_RESTORE_RSE (1 << TIF_RESTORE_RSE)
126
127/* "work to do on user-return" bits */
128#define TIF_ALLWORK_MASK (_TIF_SIGPENDING|_TIF_NOTIFY_RESUME|_TIF_SYSCALL_AUDIT|\
129 _TIF_NEED_RESCHED|_TIF_SYSCALL_TRACE)
130/* like TIF_ALLWORK_BITS but sans TIF_SYSCALL_TRACE or TIF_SYSCALL_AUDIT */
131#define TIF_WORK_MASK (TIF_ALLWORK_MASK&~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT))
132
133#define TS_POLLING 1 /* true if in idle loop and not sleeping */
134#define TS_RESTORE_SIGMASK 2 /* restore signal mask in do_signal() */
135
136#define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)
137
138#ifndef __ASSEMBLY__
139#define HAVE_SET_RESTORE_SIGMASK 1
140static inline void set_restore_sigmask(void)
141{
142 struct thread_info *ti = current_thread_info();
143 ti->status |= TS_RESTORE_SIGMASK;
144 WARN_ON(!test_bit(TIF_SIGPENDING, &ti->flags));
145}
146static inline void clear_restore_sigmask(void)
147{
148 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
149}
150static inline bool test_restore_sigmask(void)
151{
152 return current_thread_info()->status & TS_RESTORE_SIGMASK;
153}
154static inline bool test_and_clear_restore_sigmask(void)
155{
156 struct thread_info *ti = current_thread_info();
157 if (!(ti->status & TS_RESTORE_SIGMASK))
158 return false;
159 ti->status &= ~TS_RESTORE_SIGMASK;
160 return true;
161}
162#endif /* !__ASSEMBLY__ */
163
164#endif /* _ASM_IA64_THREAD_INFO_H */