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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)
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
62#endif /* __ASSEMBLY__ */
63
64
65/*
66 * Offsets in thread_info structure, used in assembly code
67 */
68#define TI_TASK 0
69#define TI_EXECDOMAIN 4
70#define TI_FLAGS 8
71#define TI_CPU 12
72#define TI_PREEMPT 16
73
74#define PREEMPT_ACTIVE 0x4000000
75
76/*
77 * thread information flag bit numbers
78 */
79#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
80#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
81#define TIF_SIGPENDING 2 /* signal pending */
82#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
83#define TIF_POLLING_NRFLAG 4 /* true if poll_idle() is polling
84 TIF_NEED_RESCHED */
85#define TIF_MEMDIE 5
86
87/* as above, but as bit values */
88#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
89#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
90#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
91#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
92#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
93
94
95/* Size of kernel stack for each process. */
96#define THREAD_SIZE 0x2000
97
98/* The alignment of kernel threads, with thread_info structures at their
99 base. Thus, a pointer for a task's task structure can be derived from
100 its kernel stack pointer. */
101#define THREAD_ALIGNMENT THREAD_SIZE
102#define THREAD_MASK (-THREAD_ALIGNMENT)
103
104
105#ifdef __ASSEMBLY__
106
107/* Put a pointer to the current thread_info structure into REG. Note that
108 this definition requires THREAD_MASK to be representable as a signed
109 16-bit value. */
110#define GET_CURRENT_THREAD(reg) \
111 /* Use `addi' and then `and' instead of just `andi', because \
112 `addi' sign-extends the immediate value, whereas `andi' \
113 zero-extends it. */ \
114 addi THREAD_MASK, r0, reg; \
115 and sp, reg
116
117#else
118
119/* Return a pointer to the current thread_info structure. */
120static inline struct thread_info *current_thread_info (void)
121{
122 register unsigned long sp __asm__ ("sp");
123 return (struct thread_info *)(sp & THREAD_MASK);
124}
125
126#endif /* __ASSEMBLY__ */
127
128
129#endif /* __KERNEL__ */
130
131#endif /* __V850_THREAD_INFO_H__ */