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 */
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 */
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 = 0, \
52 .restart_block = { \
53 .fn = do_no_restart_syscall, \
54 }, \
55 }
56
57 #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
58
59 #ifndef ASM_OFFSETS_C
60 /* how to get the thread information struct from C */
61 #define current_thread_info() ((struct thread_info *) ((char *) current + IA64_TASK_SIZE))
62 #define alloc_thread_info(tsk) ((struct thread_info *) ((char *) (tsk) + IA64_TASK_SIZE))
63 #define task_thread_info(tsk) ((struct thread_info *) ((char *) (tsk) + IA64_TASK_SIZE))
64 #else
65 #define current_thread_info() ((struct thread_info *) 0)
66 #define alloc_thread_info(tsk) ((struct thread_info *) 0)
67 #define task_thread_info(tsk) ((struct thread_info *) 0)
68 #endif
69 #define free_thread_info(ti) /* nothing */
70 #define task_stack_page(tsk) ((void *)(tsk))
71
72 #define __HAVE_THREAD_FUNCTIONS
73 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
74 #define setup_thread_stack(p, org) \
75 *task_thread_info(p) = *task_thread_info(org); \
76 task_thread_info(p)->ac_stime = 0; \
77 task_thread_info(p)->ac_utime = 0; \
78 task_thread_info(p)->task = (p);
79 #else
80 #define setup_thread_stack(p, org) \
81 *task_thread_info(p) = *task_thread_info(org); \
82 task_thread_info(p)->task = (p);
83 #endif
84 #define end_of_stack(p) (unsigned long *)((void *)(p) + IA64_RBS_OFFSET)
85
86 #define __HAVE_ARCH_TASK_STRUCT_ALLOCATOR
87 #define alloc_task_struct() ((struct task_struct *)__get_free_pages(GFP_KERNEL | __GFP_COMP, KERNEL_STACK_SIZE_ORDER))
88 #define free_task_struct(tsk) free_pages((unsigned long) (tsk), KERNEL_STACK_SIZE_ORDER)
89
90 #endif /* !__ASSEMBLY */
91
92 /*
93 * thread information flags
94 * - these are process state flags that various assembly files may need to access
95 * - pending work-to-be-done flags are in least-significant 16 bits, other flags
96 * in top 16 bits
97 */
98 #define TIF_SIGPENDING 0 /* signal pending */
99 #define TIF_NEED_RESCHED 1 /* rescheduling necessary */
100 #define TIF_SYSCALL_TRACE 2 /* syscall trace active */
101 #define TIF_SYSCALL_AUDIT 3 /* syscall auditing active */
102 #define TIF_SINGLESTEP 4 /* restore singlestep on return to user mode */
103 #define TIF_NOTIFY_RESUME 6 /* resumption notification requested */
104 #define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */
105 #define TIF_MEMDIE 17
106 #define TIF_MCA_INIT 18 /* this task is processing MCA or INIT */
107 #define TIF_DB_DISABLED 19 /* debug trap disabled for fsyscall */
108 #define TIF_FREEZE 20 /* is freezing for suspend */
109 #define TIF_RESTORE_RSE 21 /* user RBS is newer than kernel RBS */
110
111 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
112 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
113 #define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
114 #define _TIF_SYSCALL_TRACEAUDIT (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP)
115 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
116 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
117 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
118 #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
119 #define _TIF_MCA_INIT (1 << TIF_MCA_INIT)
120 #define _TIF_DB_DISABLED (1 << TIF_DB_DISABLED)
121 #define _TIF_FREEZE (1 << TIF_FREEZE)
122 #define _TIF_RESTORE_RSE (1 << TIF_RESTORE_RSE)
123
124 /* "work to do on user-return" bits */
125 #define TIF_ALLWORK_MASK (_TIF_SIGPENDING|_TIF_NOTIFY_RESUME|_TIF_SYSCALL_AUDIT|\
126 _TIF_NEED_RESCHED|_TIF_SYSCALL_TRACE)
127 /* like TIF_ALLWORK_BITS but sans TIF_SYSCALL_TRACE or TIF_SYSCALL_AUDIT */
128 #define TIF_WORK_MASK (TIF_ALLWORK_MASK&~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT))
129
130 #define TS_POLLING 1 /* true if in idle loop and not sleeping */
131 #define TS_RESTORE_SIGMASK 2 /* restore signal mask in do_signal() */
132
133 #define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)
134
135 #ifndef __ASSEMBLY__
136 #define HAVE_SET_RESTORE_SIGMASK 1
set_restore_sigmask(void)137 static inline void set_restore_sigmask(void)
138 {
139 struct thread_info *ti = current_thread_info();
140 ti->status |= TS_RESTORE_SIGMASK;
141 set_bit(TIF_SIGPENDING, &ti->flags);
142 }
143 #endif /* !__ASSEMBLY__ */
144
145 #endif /* _ASM_IA64_THREAD_INFO_H */
146