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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 */
Jesper Juhldcd497f2005-06-23 00:09:07 -070033 int preempt_count; /* 0 => preemptable,
34 <0 => BUG */
Linus Torvalds1da177e2005-04-16 15:20:36 -070035 struct restart_block restart_block;
36};
37
38#define INIT_THREAD_INFO(tsk) \
39{ \
40 .task = &tsk, \
41 .exec_domain = &default_exec_domain, \
42 .flags = 0, \
43 .cpu = 0, \
44 .preempt_count = 1, \
45 .restart_block = { \
46 .fn = do_no_restart_syscall, \
47 }, \
48}
49
50#define init_thread_info (init_thread_union.thread_info)
51#define init_stack (init_thread_union.stack)
52
53/*
54 * macros/functions for gaining access to the thread information structure
55 */
56
57/* thread information allocation */
58#define alloc_thread_info(tsk) ((struct thread_info *) \
59 __get_free_pages(GFP_KERNEL, 1))
60#define free_thread_info(ti) free_pages((unsigned long) (ti), 1)
61#define get_thread_info(ti) get_task_struct((ti)->task)
62#define put_thread_info(ti) put_task_struct((ti)->task)
63
64#endif /* __ASSEMBLY__ */
65
66
67/*
68 * Offsets in thread_info structure, used in assembly code
69 */
70#define TI_TASK 0
71#define TI_EXECDOMAIN 4
72#define TI_FLAGS 8
73#define TI_CPU 12
74#define TI_PREEMPT 16
75
76#define PREEMPT_ACTIVE 0x4000000
77
78/*
79 * thread information flag bit numbers
80 */
81#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
82#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
83#define TIF_SIGPENDING 2 /* signal pending */
84#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
85#define TIF_POLLING_NRFLAG 4 /* true if poll_idle() is polling
86 TIF_NEED_RESCHED */
87#define TIF_MEMDIE 5
88
89/* as above, but as bit values */
90#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
91#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
92#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
93#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
94#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
95
96
97/* Size of kernel stack for each process. */
98#define THREAD_SIZE 0x2000
99
100/* The alignment of kernel threads, with thread_info structures at their
101 base. Thus, a pointer for a task's task structure can be derived from
102 its kernel stack pointer. */
103#define THREAD_ALIGNMENT THREAD_SIZE
104#define THREAD_MASK (-THREAD_ALIGNMENT)
105
106
107#ifdef __ASSEMBLY__
108
109/* Put a pointer to the current thread_info structure into REG. Note that
110 this definition requires THREAD_MASK to be representable as a signed
111 16-bit value. */
112#define GET_CURRENT_THREAD(reg) \
113 /* Use `addi' and then `and' instead of just `andi', because \
114 `addi' sign-extends the immediate value, whereas `andi' \
115 zero-extends it. */ \
116 addi THREAD_MASK, r0, reg; \
117 and sp, reg
118
119#else
120
121/* Return a pointer to the current thread_info structure. */
122static inline struct thread_info *current_thread_info (void)
123{
124 register unsigned long sp __asm__ ("sp");
125 return (struct thread_info *)(sp & THREAD_MASK);
126}
127
128#endif /* __ASSEMBLY__ */
129
130
131#endif /* __KERNEL__ */
132
133#endif /* __V850_THREAD_INFO_H__ */