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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  */
21 struct 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 = INIT_PREEMPT_COUNT,	\
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_ORDER	1
53 #define THREAD_SIZE		8192	/* 2 pages */
54 
55 
56 /* how to get the thread information struct from C */
current_thread_info(void)57 static inline struct thread_info *current_thread_info(void)
58 {
59 	struct thread_info *ti;
60 	__asm__(
61 		"mov.l	sp, %0 \n\t"
62 		"and.l	%1, %0"
63 		: "=&r"(ti)
64 		: "i" (~(THREAD_SIZE-1))
65 		);
66 	return ti;
67 }
68 
69 #endif /* __ASSEMBLY__ */
70 
71 /*
72  * Offsets in thread_info structure, used in assembly code
73  */
74 #define TI_TASK		0
75 #define TI_EXECDOMAIN	4
76 #define TI_FLAGS	8
77 #define TI_CPU		12
78 #define TI_PRE_COUNT	16
79 
80 #define	PREEMPT_ACTIVE	0x4000000
81 
82 /*
83  * thread information flag bit numbers
84  */
85 #define TIF_SYSCALL_TRACE	0	/* syscall trace active */
86 #define TIF_SIGPENDING		1	/* signal pending */
87 #define TIF_NEED_RESCHED	2	/* rescheduling necessary */
88 #define TIF_POLLING_NRFLAG	3	/* true if poll_idle() is polling
89 					   TIF_NEED_RESCHED */
90 #define TIF_MEMDIE		4	/* is terminating due to OOM killer */
91 #define TIF_RESTORE_SIGMASK	5	/* restore signal mask in do_signal() */
92 #define TIF_NOTIFY_RESUME	6	/* callback before returning to user */
93 
94 /* as above, but as bit values */
95 #define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
96 #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
97 #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
98 #define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
99 #define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)
100 #define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
101 
102 #define _TIF_WORK_MASK		0x0000FFFE	/* work to do on interrupt/exception return */
103 
104 #endif /* __KERNEL__ */
105 
106 #endif /* _ASM_THREAD_INFO_H */
107