fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / include / asm-blackfin / thread_info.h
blob15b99cf4f50bbbad4a6cf2fe633bfae25b7043bb
1 /*
2 * File: include/asm-blackfin/thread_info.h
3 * Based on: include/asm-m68knommu/thread_info.h
4 * Author: LG Soft India
5 * Copyright (C) 2004-2005 Analog Devices Inc.
6 * Created: Tue Sep 21 2004
7 * Description: Blackfin low-level thread information
8 * Modified:
9 * Bugs: Enter bugs at http://blackfin.uclinux.org/
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2, or (at your option)
14 * any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; see the file COPYING.
23 * If not, write to the Free Software Foundation,
24 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
27 #ifndef _ASM_THREAD_INFO_H
28 #define _ASM_THREAD_INFO_H
30 #include <asm/page.h>
31 #include <asm/entry.h>
32 #include <asm/l1layout.h>
33 #include <linux/compiler.h>
35 #ifdef __KERNEL__
37 /* Thread Align Mask to reach to the top of the stack
38 * for any process
40 #define ALIGN_PAGE_MASK 0xffffe000
43 * Size of kernel stack for each process. This must be a power of 2...
45 #define THREAD_SIZE 8192 /* 2 pages */
47 #ifndef __ASSEMBLY__
49 typedef unsigned long mm_segment_t;
52 * low level task data.
53 * If you change this, change the TI_* offsets below to match.
56 struct thread_info {
57 struct task_struct *task; /* main task structure */
58 struct exec_domain *exec_domain; /* execution domain */
59 unsigned long flags; /* low level flags */
60 int cpu; /* cpu we're on */
61 int preempt_count; /* 0 => preemptable, <0 => BUG */
62 mm_segment_t addr_limit; /* address limit */
63 struct restart_block restart_block;
64 struct l1_scratch_task_info l1_task_info;
68 * macros/functions for gaining access to the thread information structure
70 #define INIT_THREAD_INFO(tsk) \
71 { \
72 .task = &tsk, \
73 .exec_domain = &default_exec_domain, \
74 .flags = 0, \
75 .cpu = 0, \
76 .preempt_count = 1, \
77 .restart_block = { \
78 .fn = do_no_restart_syscall, \
79 }, \
81 #define init_thread_info (init_thread_union.thread_info)
82 #define init_stack (init_thread_union.stack)
84 /* How to get the thread information struct from C */
86 static inline struct thread_info *current_thread_info(void)
87 __attribute__ ((__const__));
89 /* Given a task stack pointer, you can find it's task structure
90 * just by masking it to the 8K boundary.
92 static inline struct thread_info *current_thread_info(void)
94 struct thread_info *ti;
95 __asm__("%0 = sp;": "=&d"(ti):
97 return (struct thread_info *)((long)ti & ~((long)THREAD_SIZE-1));
100 /* thread information allocation */
101 #define alloc_thread_info(tsk) ((struct thread_info *) \
102 __get_free_pages(GFP_KERNEL, 1))
103 #define free_thread_info(ti) free_pages((unsigned long) (ti), 1)
104 #endif /* __ASSEMBLY__ */
107 * Offsets in thread_info structure, used in assembly code
109 #define TI_TASK 0
110 #define TI_EXECDOMAIN 4
111 #define TI_FLAGS 8
112 #define TI_CPU 12
113 #define TI_PREEMPT 16
115 #define PREEMPT_ACTIVE 0x4000000
118 * thread information flag bit numbers
120 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
121 #define TIF_SIGPENDING 1 /* signal pending */
122 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */
123 #define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling
124 TIF_NEED_RESCHED */
125 #define TIF_MEMDIE 4
126 #define TIF_RESTORE_SIGMASK 5 /* restore signal mask in do_signal() */
127 #define TIF_FREEZE 6 /* is freezing for suspend */
129 /* as above, but as bit values */
130 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
131 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
132 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
133 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
134 #define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
135 #define _TIF_FREEZE (1<<TIF_FREEZE)
137 #define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */
139 #endif /* __KERNEL__ */
141 #endif /* _ASM_THREAD_INFO_H */