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b920de1b DH |
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 | ||
b920de1b DH |
19 | #ifdef CONFIG_4KSTACKS |
20 | #define THREAD_SIZE (4096) | |
c03a6a7b | 21 | #define THREAD_SIZE_ORDER (0) |
b920de1b DH |
22 | #else |
23 | #define THREAD_SIZE (8192) | |
c03a6a7b | 24 | #define THREAD_SIZE_ORDER (1) |
b920de1b DH |
25 | #endif |
26 | ||
27 | #define STACK_WARN (THREAD_SIZE / 8) | |
28 | ||
29 | /* | |
30 | * low level task data that entry.S needs immediate access to | |
31 | * - this struct should fit entirely inside of one cache line | |
32 | * - this struct shares the supervisor stack pages | |
33 | * - if the contents of this structure are changed, the assembly constants | |
34 | * must also be changed | |
35 | */ | |
36 | #ifndef __ASSEMBLY__ | |
7c7fcf76 DH |
37 | typedef struct { |
38 | unsigned long seg; | |
39 | } mm_segment_t; | |
b920de1b DH |
40 | |
41 | struct thread_info { | |
42 | struct task_struct *task; /* main task structure */ | |
7c7fcf76 | 43 | struct pt_regs *frame; /* current exception frame */ |
b920de1b DH |
44 | unsigned long flags; /* low level flags */ |
45 | __u32 cpu; /* current CPU */ | |
46 | __s32 preempt_count; /* 0 => preemptable, <0 => BUG */ | |
47 | ||
48 | mm_segment_t addr_limit; /* thread address space: | |
49 | 0-0xBFFFFFFF for user-thead | |
50 | 0-0xFFFFFFFF for kernel-thread | |
51 | */ | |
b920de1b DH |
52 | |
53 | __u8 supervisor_stack[0]; | |
54 | }; | |
55 | ||
7c7fcf76 DH |
56 | #define thread_info_to_uregs(ti) \ |
57 | ((struct pt_regs *) \ | |
58 | ((unsigned long)ti + THREAD_SIZE - sizeof(struct pt_regs))) | |
59 | ||
b920de1b DH |
60 | #else /* !__ASSEMBLY__ */ |
61 | ||
62 | #ifndef __ASM_OFFSETS_H__ | |
63 | #include <asm/asm-offsets.h> | |
64 | #endif | |
65 | ||
66 | #endif | |
67 | ||
68 | /* | |
69 | * macros/functions for gaining access to the thread information structure | |
b920de1b DH |
70 | */ |
71 | #ifndef __ASSEMBLY__ | |
72 | ||
73 | #define INIT_THREAD_INFO(tsk) \ | |
74 | { \ | |
75 | .task = &tsk, \ | |
b920de1b DH |
76 | .flags = 0, \ |
77 | .cpu = 0, \ | |
c99e6efe | 78 | .preempt_count = INIT_PREEMPT_COUNT, \ |
b920de1b | 79 | .addr_limit = KERNEL_DS, \ |
b920de1b DH |
80 | } |
81 | ||
82 | #define init_thread_info (init_thread_union.thread_info) | |
83 | #define init_stack (init_thread_union.stack) | |
84 | #define init_uregs \ | |
85 | ((struct pt_regs *) \ | |
86 | ((unsigned long) init_stack + THREAD_SIZE - sizeof(struct pt_regs))) | |
87 | ||
88 | extern struct thread_info *__current_ti; | |
89 | ||
90 | /* how to get the thread information struct from C */ | |
91 | static inline __attribute__((const)) | |
92 | struct thread_info *current_thread_info(void) | |
93 | { | |
94 | struct thread_info *ti; | |
95 | asm("mov sp,%0\n" | |
96 | "and %1,%0\n" | |
97 | : "=d" (ti) | |
98 | : "i" (~(THREAD_SIZE - 1)) | |
99 | : "cc"); | |
100 | return ti; | |
101 | } | |
102 | ||
7c7fcf76 DH |
103 | static inline __attribute__((const)) |
104 | struct pt_regs *current_frame(void) | |
105 | { | |
106 | return current_thread_info()->frame; | |
107 | } | |
108 | ||
b920de1b DH |
109 | /* how to get the current stack pointer from C */ |
110 | static inline unsigned long current_stack_pointer(void) | |
111 | { | |
112 | unsigned long sp; | |
113 | asm("mov sp,%0; ":"=r" (sp)); | |
114 | return sp; | |
115 | } | |
116 | ||
5141c46c | 117 | #ifndef CONFIG_KGDB |
b235beea | 118 | void arch_release_thread_stack(unsigned long *stack); |
5141c46c | 119 | #endif |
b920de1b DH |
120 | #define get_thread_info(ti) get_task_struct((ti)->task) |
121 | #define put_thread_info(ti) put_task_struct((ti)->task) | |
122 | ||
123 | #else /* !__ASSEMBLY__ */ | |
124 | ||
125 | #ifndef __VMLINUX_LDS__ | |
126 | /* how to get the thread information struct from ASM */ | |
127 | .macro GET_THREAD_INFO reg | |
128 | mov sp,\reg | |
129 | and -THREAD_SIZE,\reg | |
130 | .endm | |
131 | #endif | |
132 | #endif | |
133 | ||
134 | /* | |
135 | * thread information flags | |
136 | * - these are process state flags that various assembly files may need to | |
137 | * access | |
138 | * - pending work-to-be-done flags are in LSW | |
139 | * - other flags in MSW | |
140 | */ | |
141 | #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ | |
142 | #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ | |
143 | #define TIF_SIGPENDING 2 /* signal pending */ | |
144 | #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ | |
145 | #define TIF_SINGLESTEP 4 /* restore singlestep on return to user mode */ | |
146 | #define TIF_RESTORE_SIGMASK 5 /* restore signal mask in do_signal() */ | |
147 | #define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */ | |
0ddc9324 | 148 | #define TIF_MEMDIE 17 /* is terminating due to OOM killer */ |
b920de1b DH |
149 | |
150 | #define _TIF_SYSCALL_TRACE +(1 << TIF_SYSCALL_TRACE) | |
151 | #define _TIF_NOTIFY_RESUME +(1 << TIF_NOTIFY_RESUME) | |
152 | #define _TIF_SIGPENDING +(1 << TIF_SIGPENDING) | |
153 | #define _TIF_NEED_RESCHED +(1 << TIF_NEED_RESCHED) | |
154 | #define _TIF_SINGLESTEP +(1 << TIF_SINGLESTEP) | |
b920de1b | 155 | #define _TIF_POLLING_NRFLAG +(1 << TIF_POLLING_NRFLAG) |
b920de1b DH |
156 | |
157 | #define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */ | |
158 | #define _TIF_ALLWORK_MASK 0x0000FFFF /* work to do on any return to u-space */ | |
159 | ||
160 | #endif /* __KERNEL__ */ | |
161 | ||
162 | #endif /* _ASM_THREAD_INFO_H */ |