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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 #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 	__u32 flags;			/* thread_info flags (see TIF_*) */
24 	__u32 cpu;			/* current CPU */
25 	__u32 last_cpu;			/* Last CPU thread ran on */
26 	__u32 status;			/* Thread synchronous flags */
27 	mm_segment_t addr_limit;	/* user-level address space limit */
28 	int preempt_count;		/* 0=premptable, <0=BUG; will also serve as bh-counter */
29 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
30 	__u64 ac_stamp;
31 	__u64 ac_leave;
32 	__u64 ac_stime;
33 	__u64 ac_utime;
34 #endif
35 };
36 
37 #define THREAD_SIZE			KERNEL_STACK_SIZE
38 
39 #define INIT_THREAD_INFO(tsk)			\
40 {						\
41 	.task		= &tsk,			\
42 	.flags		= 0,			\
43 	.cpu		= 0,			\
44 	.addr_limit	= KERNEL_DS,		\
45 	.preempt_count	= INIT_PREEMPT_COUNT,	\
46 }
47 
48 #ifndef ASM_OFFSETS_C
49 /* how to get the thread information struct from C */
50 #define current_thread_info()	((struct thread_info *) ((char *) current + IA64_TASK_SIZE))
51 #define alloc_thread_stack_node(tsk, node)	\
52 		((unsigned long *) ((char *) (tsk) + IA64_TASK_SIZE))
53 #define task_thread_info(tsk)	((struct thread_info *) ((char *) (tsk) + IA64_TASK_SIZE))
54 #else
55 #define current_thread_info()	((struct thread_info *) 0)
56 #define alloc_thread_stack_node(tsk, node)	((unsigned long *) 0)
57 #define task_thread_info(tsk)	((struct thread_info *) 0)
58 #endif
59 #define free_thread_stack(ti)	/* nothing */
60 #define task_stack_page(tsk)	((void *)(tsk))
61 
62 #define __HAVE_THREAD_FUNCTIONS
63 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
64 #define setup_thread_stack(p, org)			\
65 	*task_thread_info(p) = *task_thread_info(org);	\
66 	task_thread_info(p)->ac_stime = 0;		\
67 	task_thread_info(p)->ac_utime = 0;		\
68 	task_thread_info(p)->task = (p);
69 #else
70 #define setup_thread_stack(p, org) \
71 	*task_thread_info(p) = *task_thread_info(org); \
72 	task_thread_info(p)->task = (p);
73 #endif
74 #define end_of_stack(p) (unsigned long *)((void *)(p) + IA64_RBS_OFFSET)
75 
76 #define alloc_task_struct_node(node)						\
77 ({										\
78 	struct page *page = alloc_pages_node(node, GFP_KERNEL | __GFP_COMP,	\
79 					     KERNEL_STACK_SIZE_ORDER);		\
80 	struct task_struct *ret = page ? page_address(page) : NULL;		\
81 										\
82 	ret;									\
83 })
84 #define free_task_struct(tsk)	free_pages((unsigned long) (tsk), KERNEL_STACK_SIZE_ORDER)
85 
86 #endif /* !__ASSEMBLY */
87 
88 /*
89  * thread information flags
90  * - these are process state flags that various assembly files may need to access
91  * - pending work-to-be-done flags are in least-significant 16 bits, other flags
92  *   in top 16 bits
93  */
94 #define TIF_SIGPENDING		0	/* signal pending */
95 #define TIF_NEED_RESCHED	1	/* rescheduling necessary */
96 #define TIF_SYSCALL_TRACE	2	/* syscall trace active */
97 #define TIF_SYSCALL_AUDIT	3	/* syscall auditing active */
98 #define TIF_SINGLESTEP		4	/* restore singlestep on return to user mode */
99 #define TIF_NOTIFY_RESUME	6	/* resumption notification requested */
100 #define TIF_MEMDIE		17	/* is terminating due to OOM killer */
101 #define TIF_MCA_INIT		18	/* this task is processing MCA or INIT */
102 #define TIF_DB_DISABLED		19	/* debug trap disabled for fsyscall */
103 #define TIF_RESTORE_RSE		21	/* user RBS is newer than kernel RBS */
104 #define TIF_POLLING_NRFLAG	22	/* idle is polling for TIF_NEED_RESCHED */
105 
106 #define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
107 #define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
108 #define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
109 #define _TIF_SYSCALL_TRACEAUDIT	(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP)
110 #define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
111 #define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
112 #define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
113 #define _TIF_MCA_INIT		(1 << TIF_MCA_INIT)
114 #define _TIF_DB_DISABLED	(1 << TIF_DB_DISABLED)
115 #define _TIF_RESTORE_RSE	(1 << TIF_RESTORE_RSE)
116 #define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
117 
118 /* "work to do on user-return" bits */
119 #define TIF_ALLWORK_MASK	(_TIF_SIGPENDING|_TIF_NOTIFY_RESUME|_TIF_SYSCALL_AUDIT|\
120 				 _TIF_NEED_RESCHED|_TIF_SYSCALL_TRACE)
121 /* like TIF_ALLWORK_BITS but sans TIF_SYSCALL_TRACE or TIF_SYSCALL_AUDIT */
122 #define TIF_WORK_MASK		(TIF_ALLWORK_MASK&~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT))
123 
124 #define TS_RESTORE_SIGMASK	2	/* restore signal mask in do_signal() */
125 
126 #ifndef __ASSEMBLY__
127 #define HAVE_SET_RESTORE_SIGMASK	1
set_restore_sigmask(void)128 static inline void set_restore_sigmask(void)
129 {
130 	struct thread_info *ti = current_thread_info();
131 	ti->status |= TS_RESTORE_SIGMASK;
132 	WARN_ON(!test_bit(TIF_SIGPENDING, &ti->flags));
133 }
clear_restore_sigmask(void)134 static inline void clear_restore_sigmask(void)
135 {
136 	current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
137 }
test_restore_sigmask(void)138 static inline bool test_restore_sigmask(void)
139 {
140 	return current_thread_info()->status & TS_RESTORE_SIGMASK;
141 }
test_and_clear_restore_sigmask(void)142 static inline bool test_and_clear_restore_sigmask(void)
143 {
144 	struct thread_info *ti = current_thread_info();
145 	if (!(ti->status & TS_RESTORE_SIGMASK))
146 		return false;
147 	ti->status &= ~TS_RESTORE_SIGMASK;
148 	return true;
149 }
150 #endif	/* !__ASSEMBLY__ */
151 
152 #endif /* _ASM_IA64_THREAD_INFO_H */
153