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Linux kernel mirror (for testing)
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1/*
2 * include/asm-v850/thread_info.h -- v850 low-level thread information
3 *
4 * Copyright (C) 2002 NEC Corporation
5 * Copyright (C) 2002 Miles Bader <miles@gnu.org>
6 * Copyright (C) 2002 David Howells (dhowells@redhat.com)
7 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
8 *
9 * This file is subject to the terms and conditions of the GNU General
10 * Public License. See the file COPYING in the main directory of this
11 * archive for more details.
12 *
13 * This file was derived from the PPC version, include/asm-ppc/thread_info.h
14 * which was adapted from the i386 version by Paul Mackerras
15 */
16
17#ifndef __V850_THREAD_INFO_H__
18#define __V850_THREAD_INFO_H__
19
20#ifdef __KERNEL__
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 struct exec_domain *exec_domain; /* execution domain */
31 unsigned long flags; /* low level flags */
32 int cpu; /* cpu we're on */
33 int preempt_count;
34 struct restart_block restart_block;
35};
36
37#define INIT_THREAD_INFO(tsk) \
38{ \
39 .task = &tsk, \
40 .exec_domain = &default_exec_domain, \
41 .flags = 0, \
42 .cpu = 0, \
43 .preempt_count = 1, \
44 .restart_block = { \
45 .fn = do_no_restart_syscall, \
46 }, \
47}
48
49#define init_thread_info (init_thread_union.thread_info)
50#define init_stack (init_thread_union.stack)
51
52/*
53 * macros/functions for gaining access to the thread information structure
54 */
55
56/* thread information allocation */
57#define alloc_thread_info(tsk) ((struct thread_info *) \
58 __get_free_pages(GFP_KERNEL, 1))
59#define free_thread_info(ti) free_pages((unsigned long) (ti), 1)
60#define get_thread_info(ti) get_task_struct((ti)->task)
61#define put_thread_info(ti) put_task_struct((ti)->task)
62
63#endif /* __ASSEMBLY__ */
64
65
66/*
67 * Offsets in thread_info structure, used in assembly code
68 */
69#define TI_TASK 0
70#define TI_EXECDOMAIN 4
71#define TI_FLAGS 8
72#define TI_CPU 12
73#define TI_PREEMPT 16
74
75#define PREEMPT_ACTIVE 0x4000000
76
77/*
78 * thread information flag bit numbers
79 */
80#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
81#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
82#define TIF_SIGPENDING 2 /* signal pending */
83#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
84#define TIF_POLLING_NRFLAG 4 /* true if poll_idle() is polling
85 TIF_NEED_RESCHED */
86#define TIF_MEMDIE 5
87
88/* as above, but as bit values */
89#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
90#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
91#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
92#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
93#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
94
95
96/* Size of kernel stack for each process. */
97#define THREAD_SIZE 0x2000
98
99/* The alignment of kernel threads, with thread_info structures at their
100 base. Thus, a pointer for a task's task structure can be derived from
101 its kernel stack pointer. */
102#define THREAD_ALIGNMENT THREAD_SIZE
103#define THREAD_MASK (-THREAD_ALIGNMENT)
104
105
106#ifdef __ASSEMBLY__
107
108/* Put a pointer to the current thread_info structure into REG. Note that
109 this definition requires THREAD_MASK to be representable as a signed
110 16-bit value. */
111#define GET_CURRENT_THREAD(reg) \
112 /* Use `addi' and then `and' instead of just `andi', because \
113 `addi' sign-extends the immediate value, whereas `andi' \
114 zero-extends it. */ \
115 addi THREAD_MASK, r0, reg; \
116 and sp, reg
117
118#else
119
120/* Return a pointer to the current thread_info structure. */
121static inline struct thread_info *current_thread_info (void)
122{
123 register unsigned long sp __asm__ ("sp");
124 return (struct thread_info *)(sp & THREAD_MASK);
125}
126
127#endif /* __ASSEMBLY__ */
128
129
130#endif /* __KERNEL__ */
131
132#endif /* __V850_THREAD_INFO_H__ */