1#ifndef _ALPHA_THREAD_INFO_H
2#define _ALPHA_THREAD_INFO_H
3
4#ifdef __KERNEL__
5
6#ifndef __ASSEMBLY__
7#include <asm/processor.h>
8#include <asm/types.h>
9#include <asm/hwrpb.h>
10#endif
11
12#ifndef __ASSEMBLY__
13struct thread_info {
14	struct pcb_struct	pcb;		/* palcode state */
15
16	struct task_struct	*task;		/* main task structure */
17	unsigned int		flags;		/* low level flags */
18	unsigned int		ieee_state;	/* see fpu.h */
19
20	struct exec_domain	*exec_domain;	/* execution domain */
21	mm_segment_t		addr_limit;	/* thread address space */
22	unsigned		cpu;		/* current CPU */
23	int			preempt_count; /* 0 => preemptable, <0 => BUG */
24
25	int bpt_nsaved;
26	unsigned long bpt_addr[2];		/* breakpoint handling  */
27	unsigned int bpt_insn[2];
28
29	struct restart_block	restart_block;
30};
31
32/*
33 * Macros/functions for gaining access to the thread information structure.
34 */
35#define INIT_THREAD_INFO(tsk)			\
36{						\
37	.task		= &tsk,			\
38	.exec_domain	= &default_exec_domain,	\
39	.addr_limit	= KERNEL_DS,		\
40	.restart_block = {			\
41		.fn = do_no_restart_syscall,	\
42	},					\
43}
44
45#define init_thread_info	(init_thread_union.thread_info)
46#define init_stack		(init_thread_union.stack)
47
48/* How to get the thread information struct from C.  */
49register struct thread_info *__current_thread_info __asm__("$8");
50#define current_thread_info()  __current_thread_info
51
52/* Thread information allocation.  */
53#define THREAD_SIZE (2*PAGE_SIZE)
54#define alloc_thread_info(tsk) \
55  ((struct thread_info *) __get_free_pages(GFP_KERNEL,1))
56#define free_thread_info(ti) free_pages((unsigned long) (ti), 1)
57
58#endif /* __ASSEMBLY__ */
59
60#define PREEMPT_ACTIVE		0x40000000
61
62/*
63 * Thread information flags:
64 * - these are process state flags and used from assembly
65 * - pending work-to-be-done flags come first to fit in and immediate operand.
66 *
67 * TIF_SYSCALL_TRACE is known to be 0 via blbs.
68 */
69#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
70#define TIF_NOTIFY_RESUME	1	/* resumption notification requested */
71#define TIF_SIGPENDING		2	/* signal pending */
72#define TIF_NEED_RESCHED	3	/* rescheduling necessary */
73#define TIF_POLLING_NRFLAG	4	/* poll_idle is polling NEED_RESCHED */
74#define TIF_DIE_IF_KERNEL	5	/* dik recursion lock */
75#define TIF_UAC_NOPRINT		6	/* see sysinfo.h */
76#define TIF_UAC_NOFIX		7
77#define TIF_UAC_SIGBUS		8
78#define TIF_MEMDIE		9
79#define TIF_RESTORE_SIGMASK	10	/* restore signal mask in do_signal */
80
81#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
82#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
83#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
84#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
85#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
86#define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)
87
88/* Work to do on interrupt/exception return.  */
89#define _TIF_WORK_MASK		(_TIF_NOTIFY_RESUME	\
90				 | _TIF_SIGPENDING	\
91				 | _TIF_NEED_RESCHED)
92
93/* Work to do on any return to userspace.  */
94#define _TIF_ALLWORK_MASK	(_TIF_WORK_MASK		\
95				 | _TIF_SYSCALL_TRACE)
96
97#define ALPHA_UAC_SHIFT		6
98#define ALPHA_UAC_MASK		(1 << TIF_UAC_NOPRINT | 1 << TIF_UAC_NOFIX | \
99				 1 << TIF_UAC_SIGBUS)
100
101#define SET_UNALIGN_CTL(task,value)	({				     \
102	task_thread_info(task)->flags = ((task_thread_info(task)->flags &    \
103		~ALPHA_UAC_MASK)					     \
104		| (((value) << ALPHA_UAC_SHIFT)       & (1<<TIF_UAC_NOPRINT))\
105		| (((value) << (ALPHA_UAC_SHIFT + 1)) & (1<<TIF_UAC_SIGBUS)) \
106		| (((value) << (ALPHA_UAC_SHIFT - 1)) & (1<<TIF_UAC_NOFIX)));\
107	0; })
108
109#define GET_UNALIGN_CTL(task,value)	({				\
110	put_user((task_thread_info(task)->flags & (1 << TIF_UAC_NOPRINT))\
111		  >> ALPHA_UAC_SHIFT					\
112		 | (task_thread_info(task)->flags & (1 << TIF_UAC_SIGBUS))\
113		 >> (ALPHA_UAC_SHIFT + 1)				\
114		 | (task_thread_info(task)->flags & (1 << TIF_UAC_NOFIX))\
115		 >> (ALPHA_UAC_SHIFT - 1),				\
116		 (int __user *)(value));				\
117	})
118
119#endif /* __KERNEL__ */
120#endif /* _ALPHA_THREAD_INFO_H */
121