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#include <asm/sysinfo.h>
11#endif
12
13#ifndef __ASSEMBLY__
14struct thread_info {
15	struct pcb_struct	pcb;		/* palcode state */
16
17	struct task_struct	*task;		/* main task structure */
18	unsigned int		flags;		/* low level flags */
19	unsigned int		ieee_state;	/* see fpu.h */
20
21	mm_segment_t		addr_limit;	/* thread address space */
22	unsigned		cpu;		/* current CPU */
23	int			preempt_count; /* 0 => preemptable, <0 => BUG */
24	unsigned int		status;		/* thread-synchronous flags */
25
26	int bpt_nsaved;
27	unsigned long bpt_addr[2];		/* breakpoint handling  */
28	unsigned int bpt_insn[2];
29};
30
31/*
32 * Macros/functions for gaining access to the thread information structure.
33 */
34#define INIT_THREAD_INFO(tsk)			\
35{						\
36	.task		= &tsk,			\
37	.addr_limit	= KERNEL_DS,		\
38	.preempt_count	= INIT_PREEMPT_COUNT,	\
39}
40
41#define init_thread_info	(init_thread_union.thread_info)
42#define init_stack		(init_thread_union.stack)
43
44/* How to get the thread information struct from C.  */
45register struct thread_info *__current_thread_info __asm__("$8");
46#define current_thread_info()  __current_thread_info
47
48#endif /* __ASSEMBLY__ */
49
50/* Thread information allocation.  */
51#define THREAD_SIZE_ORDER 1
52#define THREAD_SIZE (2*PAGE_SIZE)
53
54/*
55 * Thread information flags:
56 * - these are process state flags and used from assembly
57 * - pending work-to-be-done flags come first and must be assigned to be
58 *   within bits 0 to 7 to fit in and immediate operand.
59 *
60 * TIF_SYSCALL_TRACE is known to be 0 via blbs.
61 */
62#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
63#define TIF_NOTIFY_RESUME	1	/* callback before returning to user */
64#define TIF_SIGPENDING		2	/* signal pending */
65#define TIF_NEED_RESCHED	3	/* rescheduling necessary */
66#define TIF_SYSCALL_AUDIT	4	/* syscall audit active */
67#define TIF_DIE_IF_KERNEL	9	/* dik recursion lock */
68#define TIF_MEMDIE		13	/* is terminating due to OOM killer */
69#define TIF_POLLING_NRFLAG	14	/* idle is polling for TIF_NEED_RESCHED */
70
71#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
72#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
73#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
74#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
75#define _TIF_SYSCALL_AUDIT	(1<<TIF_SYSCALL_AUDIT)
76#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
77
78/* Work to do on interrupt/exception return.  */
79#define _TIF_WORK_MASK		(_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
80				 _TIF_NOTIFY_RESUME)
81
82/* Work to do on any return to userspace.  */
83#define _TIF_ALLWORK_MASK	(_TIF_WORK_MASK		\
84				 | _TIF_SYSCALL_TRACE)
85
86#define TS_UAC_NOPRINT		0x0001	/* ! Preserve the following three */
87#define TS_UAC_NOFIX		0x0002	/* ! flags as they match          */
88#define TS_UAC_SIGBUS		0x0004	/* ! userspace part of 'osf_sysinfo' */
89#define TS_RESTORE_SIGMASK	0x0008	/* restore signal mask in do_signal() */
90
91#ifndef __ASSEMBLY__
92#define HAVE_SET_RESTORE_SIGMASK	1
93static inline void set_restore_sigmask(void)
94{
95	struct thread_info *ti = current_thread_info();
96	ti->status |= TS_RESTORE_SIGMASK;
97	WARN_ON(!test_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags));
98}
99static inline void clear_restore_sigmask(void)
100{
101	current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
102}
103static inline bool test_restore_sigmask(void)
104{
105	return current_thread_info()->status & TS_RESTORE_SIGMASK;
106}
107static inline bool test_and_clear_restore_sigmask(void)
108{
109	struct thread_info *ti = current_thread_info();
110	if (!(ti->status & TS_RESTORE_SIGMASK))
111		return false;
112	ti->status &= ~TS_RESTORE_SIGMASK;
113	return true;
114}
115#endif
116
117#define SET_UNALIGN_CTL(task,value)	({				\
118	__u32 status = task_thread_info(task)->status & ~UAC_BITMASK;	\
119	if (value & PR_UNALIGN_NOPRINT)					\
120		status |= TS_UAC_NOPRINT;				\
121	if (value & PR_UNALIGN_SIGBUS)					\
122		status |= TS_UAC_SIGBUS;				\
123	if (value & 4)	/* alpha-specific */				\
124		status |= TS_UAC_NOFIX;					\
125	task_thread_info(task)->status = status;			\
126	0; })
127
128#define GET_UNALIGN_CTL(task,value)	({				\
129	__u32 status = task_thread_info(task)->status & ~UAC_BITMASK;	\
130	__u32 res = 0;							\
131	if (status & TS_UAC_NOPRINT)					\
132		res |= PR_UNALIGN_NOPRINT;				\
133	if (status & TS_UAC_SIGBUS)					\
134		res |= PR_UNALIGN_SIGBUS;				\
135	if (status & TS_UAC_NOFIX)					\
136		res |= 4;						\
137	put_user(res, (int __user *)(value));				\
138	})
139
140#endif /* __KERNEL__ */
141#endif /* _ALPHA_THREAD_INFO_H */
142