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Bryan Wu1394f032007-05-06 14:50:22 -07001/*
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/
10 *
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.
15 *
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.
20 *
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.
25 */
26
27#ifndef _ASM_THREAD_INFO_H
28#define _ASM_THREAD_INFO_H
29
30#include <asm/page.h>
31#include <asm/entry.h>
32#include <asm/l1layout.h>
33#include <linux/compiler.h>
34
35#ifdef __KERNEL__
36
37/* Thread Align Mask to reach to the top of the stack
38 * for any process
39 */
40#define ALIGN_PAGE_MASK 0xffffe000
41
Mike Frysinger12a79912007-07-25 10:25:29 +080042/*
43 * Size of kernel stack for each process. This must be a power of 2...
44 */
45#define THREAD_SIZE 8192 /* 2 pages */
46
Bryan Wu1394f032007-05-06 14:50:22 -070047#ifndef __ASSEMBLY__
48
49typedef unsigned long mm_segment_t;
50
51/*
52 * low level task data.
53 * If you change this, change the TI_* offsets below to match.
54 */
55
56struct 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;
65};
66
67/*
68 * macros/functions for gaining access to the thread information structure
69 */
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 }, \
80}
81#define init_thread_info (init_thread_union.thread_info)
82#define init_stack (init_thread_union.stack)
83
Bryan Wu1394f032007-05-06 14:50:22 -070084/* How to get the thread information struct from C */
85
86static inline struct thread_info *current_thread_info(void)
87 __attribute__ ((__const__));
88
89/* Given a task stack pointer, you can find it's task structure
90 * just by masking it to the 8K boundary.
91 */
92static inline struct thread_info *current_thread_info(void)
93{
94 struct thread_info *ti;
95 __asm__("%0 = sp;": "=&d"(ti):
96 );
Mike Frysinger12a79912007-07-25 10:25:29 +080097 return (struct thread_info *)((long)ti & ~((long)THREAD_SIZE-1));
Bryan Wu1394f032007-05-06 14:50:22 -070098}
99
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__ */
105
106/*
107 * Offsets in thread_info structure, used in assembly code
108 */
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
114
115#define PREEMPT_ACTIVE 0x4000000
116
117/*
118 * thread information flag bit numbers
119 */
120#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
Stephane Eraniana583f1b2007-07-31 00:38:00 -0700121#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
Bryan Wu1394f032007-05-06 14:50:22 -0700124 TIF_NEED_RESCHED */
Stephane Eraniana583f1b2007-07-31 00:38:00 -0700125#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 */
Bryan Wu1394f032007-05-06 14:50:22 -0700128
129/* as above, but as bit values */
130#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
Bryan Wu1394f032007-05-06 14:50:22 -0700131#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)
136
137#define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */
138
139#endif /* __KERNEL__ */
140
141#endif /* _ASM_THREAD_INFO_H */