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1 | /* MN10300 Low-level thread information |
2 | * | |
3 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public Licence | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the Licence, or (at your option) any later version. | |
10 | */ | |
11 | ||
12 | #ifndef _ASM_THREAD_INFO_H | |
13 | #define _ASM_THREAD_INFO_H | |
14 | ||
15 | #ifdef __KERNEL__ | |
16 | ||
17 | #include <asm/page.h> | |
18 | ||
19 | #ifndef __ASSEMBLY__ | |
20 | #include <asm/processor.h> | |
21 | #endif | |
22 | ||
23 | #define PREEMPT_ACTIVE 0x10000000 | |
24 | ||
25 | #ifdef CONFIG_4KSTACKS | |
26 | #define THREAD_SIZE (4096) | |
27 | #else | |
28 | #define THREAD_SIZE (8192) | |
29 | #endif | |
30 | ||
31 | #define STACK_WARN (THREAD_SIZE / 8) | |
32 | ||
33 | /* | |
34 | * low level task data that entry.S needs immediate access to | |
35 | * - this struct should fit entirely inside of one cache line | |
36 | * - this struct shares the supervisor stack pages | |
37 | * - if the contents of this structure are changed, the assembly constants | |
38 | * must also be changed | |
39 | */ | |
40 | #ifndef __ASSEMBLY__ | |
41 | ||
42 | struct thread_info { | |
43 | struct task_struct *task; /* main task structure */ | |
44 | struct exec_domain *exec_domain; /* execution domain */ | |
45 | unsigned long flags; /* low level flags */ | |
46 | __u32 cpu; /* current CPU */ | |
47 | __s32 preempt_count; /* 0 => preemptable, <0 => BUG */ | |
48 | ||
49 | mm_segment_t addr_limit; /* thread address space: | |
50 | 0-0xBFFFFFFF for user-thead | |
51 | 0-0xFFFFFFFF for kernel-thread | |
52 | */ | |
53 | struct restart_block restart_block; | |
54 | ||
55 | __u8 supervisor_stack[0]; | |
56 | }; | |
57 | ||
58 | #else /* !__ASSEMBLY__ */ | |
59 | ||
60 | #ifndef __ASM_OFFSETS_H__ | |
61 | #include <asm/asm-offsets.h> | |
62 | #endif | |
63 | ||
64 | #endif | |
65 | ||
66 | /* | |
67 | * macros/functions for gaining access to the thread information structure | |
68 | * | |
69 | * preempt_count needs to be 1 initially, until the scheduler is functional. | |
70 | */ | |
71 | #ifndef __ASSEMBLY__ | |
72 | ||
73 | #define INIT_THREAD_INFO(tsk) \ | |
74 | { \ | |
75 | .task = &tsk, \ | |
76 | .exec_domain = &default_exec_domain, \ | |
77 | .flags = 0, \ | |
78 | .cpu = 0, \ | |
79 | .preempt_count = 1, \ | |
80 | .addr_limit = KERNEL_DS, \ | |
81 | .restart_block = { \ | |
82 | .fn = do_no_restart_syscall, \ | |
83 | }, \ | |
84 | } | |
85 | ||
86 | #define init_thread_info (init_thread_union.thread_info) | |
87 | #define init_stack (init_thread_union.stack) | |
88 | #define init_uregs \ | |
89 | ((struct pt_regs *) \ | |
90 | ((unsigned long) init_stack + THREAD_SIZE - sizeof(struct pt_regs))) | |
91 | ||
92 | extern struct thread_info *__current_ti; | |
93 | ||
94 | /* how to get the thread information struct from C */ | |
95 | static inline __attribute__((const)) | |
96 | struct thread_info *current_thread_info(void) | |
97 | { | |
98 | struct thread_info *ti; | |
99 | asm("mov sp,%0\n" | |
100 | "and %1,%0\n" | |
101 | : "=d" (ti) | |
102 | : "i" (~(THREAD_SIZE - 1)) | |
103 | : "cc"); | |
104 | return ti; | |
105 | } | |
106 | ||
107 | /* how to get the current stack pointer from C */ | |
108 | static inline unsigned long current_stack_pointer(void) | |
109 | { | |
110 | unsigned long sp; | |
111 | asm("mov sp,%0; ":"=r" (sp)); | |
112 | return sp; | |
113 | } | |
114 | ||
115 | /* thread information allocation */ | |
116 | #ifdef CONFIG_DEBUG_STACK_USAGE | |
117 | #define alloc_thread_info(tsk) kzalloc(THREAD_SIZE, GFP_KERNEL) | |
118 | #else | |
119 | #define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL) | |
120 | #endif | |
121 | ||
122 | #define free_thread_info(ti) kfree((ti)) | |
123 | #define get_thread_info(ti) get_task_struct((ti)->task) | |
124 | #define put_thread_info(ti) put_task_struct((ti)->task) | |
125 | ||
126 | #else /* !__ASSEMBLY__ */ | |
127 | ||
128 | #ifndef __VMLINUX_LDS__ | |
129 | /* how to get the thread information struct from ASM */ | |
130 | .macro GET_THREAD_INFO reg | |
131 | mov sp,\reg | |
132 | and -THREAD_SIZE,\reg | |
133 | .endm | |
134 | #endif | |
135 | #endif | |
136 | ||
137 | /* | |
138 | * thread information flags | |
139 | * - these are process state flags that various assembly files may need to | |
140 | * access | |
141 | * - pending work-to-be-done flags are in LSW | |
142 | * - other flags in MSW | |
143 | */ | |
144 | #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ | |
145 | #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ | |
146 | #define TIF_SIGPENDING 2 /* signal pending */ | |
147 | #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ | |
148 | #define TIF_SINGLESTEP 4 /* restore singlestep on return to user mode */ | |
149 | #define TIF_RESTORE_SIGMASK 5 /* restore signal mask in do_signal() */ | |
150 | #define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */ | |
151 | #define TIF_MEMDIE 17 /* OOM killer killed process */ | |
152 | #define TIF_FREEZE 18 /* freezing for suspend */ | |
153 | ||
154 | #define _TIF_SYSCALL_TRACE +(1 << TIF_SYSCALL_TRACE) | |
155 | #define _TIF_NOTIFY_RESUME +(1 << TIF_NOTIFY_RESUME) | |
156 | #define _TIF_SIGPENDING +(1 << TIF_SIGPENDING) | |
157 | #define _TIF_NEED_RESCHED +(1 << TIF_NEED_RESCHED) | |
158 | #define _TIF_SINGLESTEP +(1 << TIF_SINGLESTEP) | |
159 | #define _TIF_RESTORE_SIGMASK +(1 << TIF_RESTORE_SIGMASK) | |
160 | #define _TIF_POLLING_NRFLAG +(1 << TIF_POLLING_NRFLAG) | |
161 | #define _TIF_FREEZE +(1 << TIF_FREEZE) | |
162 | ||
163 | #define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */ | |
164 | #define _TIF_ALLWORK_MASK 0x0000FFFF /* work to do on any return to u-space */ | |
165 | ||
166 | #endif /* __KERNEL__ */ | |
167 | ||
168 | #endif /* _ASM_THREAD_INFO_H */ |