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thread_info.h
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1 /*
2  * Copyright (C) 2002-2003 Hewlett-Packard Co
3  * David Mosberger-Tang <[email protected]>
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  */
24 struct 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 */
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_MEMDIE 17 /* is terminating due to OOM killer */
110 #define TIF_MCA_INIT 18 /* this task is processing MCA or INIT */
111 #define TIF_DB_DISABLED 19 /* debug trap disabled for fsyscall */
112 #define TIF_RESTORE_RSE 21 /* user RBS is newer than kernel RBS */
113 
114 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
115 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
116 #define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
117 #define _TIF_SYSCALL_TRACEAUDIT (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP)
118 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
119 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
120 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
121 #define _TIF_MCA_INIT (1 << TIF_MCA_INIT)
122 #define _TIF_DB_DISABLED (1 << TIF_DB_DISABLED)
123 #define _TIF_RESTORE_RSE (1 << TIF_RESTORE_RSE)
124 
125 /* "work to do on user-return" bits */
126 #define TIF_ALLWORK_MASK (_TIF_SIGPENDING|_TIF_NOTIFY_RESUME|_TIF_SYSCALL_AUDIT|\
127  _TIF_NEED_RESCHED|_TIF_SYSCALL_TRACE)
128 /* like TIF_ALLWORK_BITS but sans TIF_SYSCALL_TRACE or TIF_SYSCALL_AUDIT */
129 #define TIF_WORK_MASK (TIF_ALLWORK_MASK&~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT))
130 
131 #define TS_POLLING 1 /* true if in idle loop and not sleeping */
132 #define TS_RESTORE_SIGMASK 2 /* restore signal mask in do_signal() */
133 
134 #define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)
135 
136 #ifndef __ASSEMBLY__
137 #define HAVE_SET_RESTORE_SIGMASK 1
138 static inline void set_restore_sigmask(void)
139 {
140  struct thread_info *ti = current_thread_info();
141  ti->status |= TS_RESTORE_SIGMASK;
143 }
144 static inline void clear_restore_sigmask(void)
145 {
147 }
148 static inline bool test_restore_sigmask(void)
149 {
150  return current_thread_info()->status & TS_RESTORE_SIGMASK;
151 }
152 static inline bool test_and_clear_restore_sigmask(void)
153 {
154  struct thread_info *ti = current_thread_info();
155  if (!(ti->status & TS_RESTORE_SIGMASK))
156  return false;
157  ti->status &= ~TS_RESTORE_SIGMASK;
158  return true;
159 }
160 #endif /* !__ASSEMBLY__ */
161 
162 #endif /* _ASM_IA64_THREAD_INFO_H */