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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
29typedef struct {
30 unsigned long seg;
31} mm_segment_t;
32
33/*
34 * low level task data that entry.S needs immediate access to
35 * - this struct should fit entirely inside of one cache line
36 * - this struct shares the supervisor stack pages
37 * - if the contents of this structure are changed, the assembly constants
38 * must also be changed
39 */
40struct thread_info {
41 struct task_struct *task; /* main task structure */
42 unsigned long flags; /* low level flags */
43 __u32 cpu; /* current CPU */
44 int preempt_count; /* 0 => preemptable,<0 => BUG */
45 mm_segment_t addr_limit; /* thread address space:
46 0-0x7FFFFFFF for user-thead
47 0-0xFFFFFFFF for kernel-thread
48 */
49 struct pt_regs *regs;
50};
51
52/*
53 * macros/functions for gaining access to the thread information structure
54 *
55 * preempt_count needs to be 1 initially, until the scheduler is functional.
56 */
57#define INIT_THREAD_INFO(tsk) \
58{ \
59 .task = &tsk, \
60 .flags = 0, \
61 .cpu = 0, \
62 .preempt_count = INIT_PREEMPT_COUNT, \
63 .addr_limit = KERNEL_DS, \
64}
65
66/* how to get the thread information struct from C */
67static inline struct thread_info *current_thread_info(void)
68{
69 register unsigned long sp asm("sp");
70
71 return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
72}
73#endif /* !__ASSEMBLY__ */
74
75/*
76 * thread information flags
77 * - these are process state flags that various assembly files may need to
78 * access
79 * - pending work-to-be-done flags are in LSW
80 * - other flags in MSW
81 */
82#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
83#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
84#define TIF_SIGPENDING 2 /* signal pending */
85#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
86#define TIF_MEMDIE 4 /* is terminating due to OOM killer */
87#define TIF_SECCOMP 5 /* secure computing */
88#define TIF_SYSCALL_AUDIT 6 /* syscall auditing active */
89#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */
90
91#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling
92 TIF_NEED_RESCHED */
93
94#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
95#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
96#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
97#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
98#define _TIF_SECCOMP (1 << TIF_SECCOMP)
99#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
100#define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK)
101#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
102
103/* work to do on interrupt/exception return */
104#define _TIF_WORK_MASK 0x0000FFFE
105
106/* work to do on any return to u-space */
107# define _TIF_ALLWORK_MASK 0x0000FFFF
108
109#endif /* __KERNEL__ */
110
111#endif /* _ASM_NIOS2_THREAD_INFO_H */