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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  #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	= INIT_PREEMPT_COUNT,	\
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_node(tsk, node)	\
63  		((struct thread_info *) ((char *) (tsk) + IA64_TASK_SIZE))
64  #define task_thread_info(tsk)	((struct thread_info *) ((char *) (tsk) + IA64_TASK_SIZE))
65  #else
66  #define current_thread_info()	((struct thread_info *) 0)
67  #define alloc_thread_info_node(tsk, node)	((struct thread_info *) 0)
68  #define task_thread_info(tsk)	((struct thread_info *) 0)
69  #endif
70  #define free_thread_info(ti)	/* nothing */
71  #define task_stack_page(tsk)	((void *)(tsk))
72  
73  #define __HAVE_THREAD_FUNCTIONS
74  #ifdef CONFIG_VIRT_CPU_ACCOUNTING
75  #define setup_thread_stack(p, org)			\
76  	*task_thread_info(p) = *task_thread_info(org);	\
77  	task_thread_info(p)->ac_stime = 0;		\
78  	task_thread_info(p)->ac_utime = 0;		\
79  	task_thread_info(p)->task = (p);
80  #else
81  #define setup_thread_stack(p, org) \
82  	*task_thread_info(p) = *task_thread_info(org); \
83  	task_thread_info(p)->task = (p);
84  #endif
85  #define end_of_stack(p) (unsigned long *)((void *)(p) + IA64_RBS_OFFSET)
86  
87  #define __HAVE_ARCH_TASK_STRUCT_ALLOCATOR
88  #define alloc_task_struct_node(node)						\
89  ({										\
90  	struct page *page = alloc_pages_node(node, GFP_KERNEL | __GFP_COMP,	\
91  					     KERNEL_STACK_SIZE_ORDER);		\
92  	struct task_struct *ret = page ? page_address(page) : NULL;		\
93  										\
94  	ret;									\
95  })
96  #define free_task_struct(tsk)	free_pages((unsigned long) (tsk), KERNEL_STACK_SIZE_ORDER)
97  
98  #endif /* !__ASSEMBLY */
99  
100  /*
101   * thread information flags
102   * - these are process state flags that various assembly files may need to access
103   * - pending work-to-be-done flags are in least-significant 16 bits, other flags
104   *   in top 16 bits
105   */
106  #define TIF_SIGPENDING		0	/* signal pending */
107  #define TIF_NEED_RESCHED	1	/* rescheduling necessary */
108  #define TIF_SYSCALL_TRACE	2	/* syscall trace active */
109  #define TIF_SYSCALL_AUDIT	3	/* syscall auditing active */
110  #define TIF_SINGLESTEP		4	/* restore singlestep on return to user mode */
111  #define TIF_NOTIFY_RESUME	6	/* resumption notification requested */
112  #define TIF_POLLING_NRFLAG	16	/* true if poll_idle() is polling TIF_NEED_RESCHED */
113  #define TIF_MEMDIE		17	/* is terminating due to OOM killer */
114  #define TIF_MCA_INIT		18	/* this task is processing MCA or INIT */
115  #define TIF_DB_DISABLED		19	/* debug trap disabled for fsyscall */
116  #define TIF_RESTORE_RSE		21	/* user RBS is newer than kernel RBS */
117  
118  #define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
119  #define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
120  #define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
121  #define _TIF_SYSCALL_TRACEAUDIT	(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP)
122  #define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
123  #define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
124  #define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
125  #define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
126  #define _TIF_MCA_INIT		(1 << TIF_MCA_INIT)
127  #define _TIF_DB_DISABLED	(1 << TIF_DB_DISABLED)
128  #define _TIF_RESTORE_RSE	(1 << TIF_RESTORE_RSE)
129  
130  /* "work to do on user-return" bits */
131  #define TIF_ALLWORK_MASK	(_TIF_SIGPENDING|_TIF_NOTIFY_RESUME|_TIF_SYSCALL_AUDIT|\
132  				 _TIF_NEED_RESCHED|_TIF_SYSCALL_TRACE)
133  /* like TIF_ALLWORK_BITS but sans TIF_SYSCALL_TRACE or TIF_SYSCALL_AUDIT */
134  #define TIF_WORK_MASK		(TIF_ALLWORK_MASK&~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT))
135  
136  #define TS_POLLING		1 	/* true if in idle loop and not sleeping */
137  #define TS_RESTORE_SIGMASK	2	/* restore signal mask in do_signal() */
138  
139  #define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)
140  
141  #ifndef __ASSEMBLY__
142  #define HAVE_SET_RESTORE_SIGMASK	1
set_restore_sigmask(void)143  static inline void set_restore_sigmask(void)
144  {
145  	struct thread_info *ti = current_thread_info();
146  	ti->status |= TS_RESTORE_SIGMASK;
147  	set_bit(TIF_SIGPENDING, &ti->flags);
148  }
149  #endif	/* !__ASSEMBLY__ */
150  
151  #endif /* _ASM_IA64_THREAD_INFO_H */
152