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
13#ifdef __KERNEL__
14
15#ifndef __ASSEMBLY__
16
17/*
18 * low level task data.
19 * If you change this, change the TI_* offsets below to match.
20 */
21struct thread_info {
22	struct task_struct *task;		/* main task structure */
23	struct exec_domain *exec_domain;	/* execution domain */
24	unsigned long	   flags;		/* low level flags */
25	int		   cpu;			/* cpu we're on */
26	int		   preempt_count;	/* 0 => preemptable, <0 => BUG */
27	struct restart_block restart_block;
28};
29
30/*
31 * macros/functions for gaining access to the thread information structure
32 */
33#define INIT_THREAD_INFO(tsk)			\
34{						\
35	.task =		&tsk,			\
36	.exec_domain =	&default_exec_domain,	\
37	.flags =	0,			\
38	.cpu =		0,			\
39	.preempt_count = 1,			\
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
49/*
50 * Size of kernel stack for each process. This must be a power of 2...
51 */
52#define THREAD_SIZE		8192	/* 2 pages */
53
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	__asm__(
60		"mov.l	sp, %0 \n\t"
61		"and.l	%1, %0"
62		: "=&r"(ti)
63		: "i" (~(THREAD_SIZE-1))
64		);
65	return ti;
66}
67
68/* thread information allocation */
69#define alloc_thread_info(tsk) ((struct thread_info *) \
70				__get_free_pages(GFP_KERNEL, 1))
71#define free_thread_info(ti)	free_pages((unsigned long) (ti), 1)
72#endif /* __ASSEMBLY__ */
73
74/*
75 * Offsets in thread_info structure, used in assembly code
76 */
77#define TI_TASK		0
78#define TI_EXECDOMAIN	4
79#define TI_FLAGS	8
80#define TI_CPU		12
81#define TI_PRE_COUNT	16
82
83#define	PREEMPT_ACTIVE	0x4000000
84
85/*
86 * thread information flag bit numbers
87 */
88#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
89#define TIF_NOTIFY_RESUME	1	/* resumption notification requested */
90#define TIF_SIGPENDING		2	/* signal pending */
91#define TIF_NEED_RESCHED	3	/* rescheduling necessary */
92#define TIF_POLLING_NRFLAG	4	/* true if poll_idle() is polling
93					   TIF_NEED_RESCHED */
94#define TIF_MEMDIE		5
95
96/* as above, but as bit values */
97#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
98#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
99#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
100#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
101#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
102
103#define _TIF_WORK_MASK		0x0000FFFE	/* work to do on interrupt/exception return */
104
105#endif /* __KERNEL__ */
106
107#endif /* _ASM_THREAD_INFO_H */
108