1/* thread_info.h: h8300 low-level thread information
2 * adapted from the i386 and PPC versions by Yoshinori Sato <ysato@users.sourceforge.jp>
3 *
4 * Copyright (C) 2002  David Howells (dhowells@redhat.com)
5 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
6 */
7
8#ifndef _ASM_THREAD_INFO_H
9#define _ASM_THREAD_INFO_H
10
11#include <asm/page.h>
12#include <asm/segment.h>
13
14#ifdef __KERNEL__
15
16/*
17 * Size of kernel stack for each process. This must be a power of 2...
18 */
19#define THREAD_SIZE_ORDER	1
20#define THREAD_SIZE		8192	/* 2 pages */
21
22#ifndef __ASSEMBLY__
23
24/*
25 * low level task data.
26 * If you change this, change the TI_* offsets below to match.
27 */
28struct thread_info {
29	struct task_struct *task;		/* main task structure */
30	unsigned long	   flags;		/* low level flags */
31	int		   cpu;			/* cpu we're on */
32	int		   preempt_count;	/* 0 => preemptable, <0 => BUG */
33	mm_segment_t		addr_limit;
34	struct restart_block restart_block;
35};
36
37/*
38 * macros/functions for gaining access to the thread information structure
39 */
40#define INIT_THREAD_INFO(tsk)			\
41{						\
42	.task =		&tsk,			\
43	.flags =	0,			\
44	.cpu =		0,			\
45	.preempt_count = INIT_PREEMPT_COUNT,	\
46	.addr_limit	= KERNEL_DS,		\
47	.restart_block	= {			\
48		.fn = do_no_restart_syscall,	\
49	},					\
50}
51
52#define init_thread_info	(init_thread_union.thread_info)
53#define init_stack		(init_thread_union.stack)
54
55/* how to get the thread information struct from C */
56static inline struct thread_info *current_thread_info(void)
57{
58	struct thread_info *ti;
59
60	__asm__("mov.l	sp, %0\n\t"
61		"and.w	%1, %T0"
62		: "=&r"(ti)
63		: "i" (~(THREAD_SIZE-1) & 0xffff));
64	return ti;
65}
66
67#endif /* __ASSEMBLY__ */
68
69/*
70 * thread information flag bit numbers
71 */
72#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
73#define TIF_SIGPENDING		1	/* signal pending */
74#define TIF_NEED_RESCHED	2	/* rescheduling necessary */
75#define TIF_SINGLESTEP		3	/* singlestepping active */
76#define TIF_MEMDIE		4	/* is terminating due to OOM killer */
77#define TIF_RESTORE_SIGMASK	5	/* restore signal mask in do_signal() */
78#define TIF_NOTIFY_RESUME	6	/* callback before returning to user */
79#define TIF_SYSCALL_AUDIT	7	/* syscall auditing active */
80#define TIF_SYSCALL_TRACEPOINT	8	/* for ftrace syscall instrumentation */
81#define TIF_POLLING_NRFLAG	9	/* true if poll_idle() is polling TIF_NEED_RESCHED */
82
83/* as above, but as bit values */
84#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
85#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
86#define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
87#define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
88#define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
89#define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
90#define _TIF_SYSCALL_TRACEPOINT	(1 << TIF_SYSCALL_TRACEPOINT)
91#define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
92
93/* work to do in syscall trace */
94#define _TIF_WORK_SYSCALL_MASK	(_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
95				 _TIF_SYSCALL_AUDIT | _TIF_SYSCALL_TRACEPOINT)
96
97/* work to do on any return to u-space */
98#define _TIF_ALLWORK_MASK	(_TIF_SYSCALL_TRACE | _TIF_SIGPENDING      | \
99				 _TIF_NEED_RESCHED  | _TIF_SYSCALL_AUDIT   | \
100				 _TIF_SINGLESTEP    | _TIF_NOTIFY_RESUME   | \
101				 _TIF_SYSCALL_TRACEPOINT)
102
103/* work to do on interrupt/exception return */
104#define _TIF_WORK_MASK		(_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \
105				 _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP))
106
107#endif /* __KERNEL__ */
108
109#endif /* _ASM_THREAD_INFO_H */
110