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 */
21struct 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_info_node(tsk, node)	\
52		((struct thread_info *) ((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_info_node(tsk, node)	((struct thread_info *) 0)
57#define task_thread_info(tsk)	((struct thread_info *) 0)
58#endif
59#define free_thread_info(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
128static 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}
134static inline void clear_restore_sigmask(void)
135{
136	current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
137}
138static inline bool test_restore_sigmask(void)
139{
140	return current_thread_info()->status & TS_RESTORE_SIGMASK;
141}
142static 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