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 */
21 struct 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
set_restore_sigmask(void)130 static 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 }
clear_restore_sigmask(void)136 static inline void clear_restore_sigmask(void)
137 {
138 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
139 }
test_restore_sigmask(void)140 static inline bool test_restore_sigmask(void)
141 {
142 return current_thread_info()->status & TS_RESTORE_SIGMASK;
143 }
test_and_clear_restore_sigmask(void)144 static 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 */
155