1/*
2 * NiosII low-level thread information
3 *
4 * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>
5 * Copyright (C) 2004 Microtronix Datacom Ltd.
6 *
7 * Based on asm/thread_info_no.h from m68k which is:
8 *
9 * Copyright (C) 2002 David Howells <dhowells@redhat.com>
10 *
11 * This file is subject to the terms and conditions of the GNU General Public
12 * License.  See the file "COPYING" in the main directory of this archive
13 * for more details.
14 */
15
16#ifndef _ASM_NIOS2_THREAD_INFO_H
17#define _ASM_NIOS2_THREAD_INFO_H
18
19#ifdef __KERNEL__
20
21/*
22 * Size of the kernel stack for each process.
23 */
24#define THREAD_SIZE_ORDER	1
25#define THREAD_SIZE		8192 /* 2 * PAGE_SIZE */
26
27#ifndef __ASSEMBLY__
28
29/*
30 * low level task data that entry.S needs immediate access to
31 * - this struct should fit entirely inside of one cache line
32 * - this struct shares the supervisor stack pages
33 * - if the contents of this structure are changed, the assembly constants
34 *   must also be changed
35 */
36struct thread_info {
37	struct task_struct	*task;		/* main task structure */
38	unsigned long		flags;		/* low level flags */
39	__u32			cpu;		/* current CPU */
40	int			preempt_count;	/* 0 => preemptable,<0 => BUG */
41	struct pt_regs		*regs;
42};
43
44/*
45 * macros/functions for gaining access to the thread information structure
46 *
47 * preempt_count needs to be 1 initially, until the scheduler is functional.
48 */
49#define INIT_THREAD_INFO(tsk)			\
50{						\
51	.task		= &tsk,			\
52	.flags		= 0,			\
53	.cpu		= 0,			\
54	.preempt_count	= INIT_PREEMPT_COUNT,	\
55}
56
57/* how to get the thread information struct from C */
58static inline struct thread_info *current_thread_info(void)
59{
60	register unsigned long sp asm("sp");
61
62	return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
63}
64#endif /* !__ASSEMBLY__ */
65
66/*
67 * thread information flags
68 * - these are process state flags that various assembly files may need to
69 *   access
70 * - pending work-to-be-done flags are in LSW
71 * - other flags in MSW
72 */
73#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
74#define TIF_NOTIFY_RESUME	1	/* resumption notification requested */
75#define TIF_SIGPENDING		2	/* signal pending */
76#define TIF_NEED_RESCHED	3	/* rescheduling necessary */
77#define TIF_MEMDIE		4	/* is terminating due to OOM killer */
78#define TIF_SECCOMP		5	/* secure computing */
79#define TIF_SYSCALL_AUDIT	6	/* syscall auditing active */
80#define TIF_NOTIFY_SIGNAL	7	/* signal notifications exist */
81#define TIF_RESTORE_SIGMASK	9	/* restore signal mask in do_signal() */
82
83#define TIF_POLLING_NRFLAG	16	/* true if poll_idle() is polling
84					   TIF_NEED_RESCHED */
85
86#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
87#define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
88#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
89#define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
90#define _TIF_SECCOMP		(1 << TIF_SECCOMP)
91#define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
92#define _TIF_NOTIFY_SIGNAL	(1 << TIF_NOTIFY_SIGNAL)
93#define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)
94#define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
95
96/* work to do on interrupt/exception return */
97#define _TIF_WORK_MASK		0x0000FFFE
98
99#endif /* __KERNEL__ */
100
101#endif /* _ASM_NIOS2_THREAD_INFO_H */
102