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1394f032 BW |
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/ | |
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 | ||
12a79911 MF |
42 | /* |
43 | * Size of kernel stack for each process. This must be a power of 2... | |
44 | */ | |
45 | #define THREAD_SIZE 8192 /* 2 pages */ | |
46 | ||
1394f032 BW |
47 | #ifndef __ASSEMBLY__ |
48 | ||
49 | typedef 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 | ||
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; | |
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 | ||
1394f032 BW |
84 | /* How to get the thread information struct from C */ |
85 | ||
86 | static 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 | */ | |
92 | static inline struct thread_info *current_thread_info(void) | |
93 | { | |
94 | struct thread_info *ti; | |
95 | __asm__("%0 = sp;": "=&d"(ti): | |
96 | ); | |
12a79911 | 97 | return (struct thread_info *)((long)ti & ~((long)THREAD_SIZE-1)); |
1394f032 BW |
98 | } |
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 */ | |
a583f1b5 SE |
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 | |
1394f032 | 124 | TIF_NEED_RESCHED */ |
a583f1b5 SE |
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 */ | |
1394f032 BW |
128 | |
129 | /* as above, but as bit values */ | |
130 | #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) | |
1394f032 BW |
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) | |
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 */ |