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4684dade MS |
1 | /* |
2 | * Copyright (C) 2006 Atmark Techno, Inc. | |
3 | * | |
4 | * This file is subject to the terms and conditions of the GNU General Public | |
5 | * License. See the file "COPYING" in the main directory of this archive | |
6 | * for more details. | |
7 | */ | |
8 | ||
9 | #ifndef _ASM_MICROBLAZE_THREAD_INFO_H | |
10 | #define _ASM_MICROBLAZE_THREAD_INFO_H | |
11 | ||
12 | #ifdef __KERNEL__ | |
13 | ||
14 | /* we have 8k stack */ | |
15 | #define THREAD_SHIFT 13 | |
16 | #define THREAD_SIZE (1 << THREAD_SHIFT) | |
17 | #define THREAD_SIZE_ORDER 1 | |
18 | ||
19 | #ifndef __ASSEMBLY__ | |
20 | # include <linux/types.h> | |
21 | # include <asm/processor.h> | |
4684dade MS |
22 | |
23 | /* | |
24 | * low level task data that entry.S needs immediate access to | |
25 | * - this struct should fit entirely inside of one cache line | |
26 | * - this struct shares the supervisor stack pages | |
27 | * - if the contents of this structure are changed, the assembly constants | |
28 | * must also be changed | |
29 | */ | |
30 | ||
31 | struct cpu_context { | |
32 | __u32 r1; /* stack pointer */ | |
33 | __u32 r2; | |
34 | /* dedicated registers */ | |
35 | __u32 r13; | |
36 | __u32 r14; | |
37 | __u32 r15; | |
38 | __u32 r16; | |
39 | __u32 r17; | |
40 | __u32 r18; | |
41 | /* non-volatile registers */ | |
42 | __u32 r19; | |
43 | __u32 r20; | |
44 | __u32 r21; | |
45 | __u32 r22; | |
46 | __u32 r23; | |
47 | __u32 r24; | |
48 | __u32 r25; | |
49 | __u32 r26; | |
50 | __u32 r27; | |
51 | __u32 r28; | |
52 | __u32 r29; | |
53 | __u32 r30; | |
54 | /* r31 is used as current task pointer */ | |
55 | /* special purpose registers */ | |
56 | __u32 msr; | |
57 | __u32 ear; | |
58 | __u32 esr; | |
59 | __u32 fsr; | |
60 | }; | |
61 | ||
40db0834 MS |
62 | typedef struct { |
63 | unsigned long seg; | |
64 | } mm_segment_t; | |
65 | ||
4684dade MS |
66 | struct thread_info { |
67 | struct task_struct *task; /* main task structure */ | |
4684dade MS |
68 | unsigned long flags; /* low level flags */ |
69 | unsigned long status; /* thread-synchronous flags */ | |
70 | __u32 cpu; /* current CPU */ | |
71 | __s32 preempt_count; /* 0 => preemptable,< 0 => BUG*/ | |
72 | mm_segment_t addr_limit; /* thread address space */ | |
4684dade MS |
73 | |
74 | struct cpu_context cpu_context; | |
75 | }; | |
76 | ||
77 | /* | |
78 | * macros/functions for gaining access to the thread information structure | |
4684dade MS |
79 | */ |
80 | #define INIT_THREAD_INFO(tsk) \ | |
81 | { \ | |
82 | .task = &tsk, \ | |
4684dade MS |
83 | .flags = 0, \ |
84 | .cpu = 0, \ | |
c99e6efe | 85 | .preempt_count = INIT_PREEMPT_COUNT, \ |
4684dade | 86 | .addr_limit = KERNEL_DS, \ |
4684dade MS |
87 | } |
88 | ||
89 | #define init_thread_info (init_thread_union.thread_info) | |
90 | #define init_stack (init_thread_union.stack) | |
91 | ||
92 | /* how to get the thread information struct from C */ | |
93 | static inline struct thread_info *current_thread_info(void) | |
94 | { | |
95 | register unsigned long sp asm("r1"); | |
96 | ||
97 | return (struct thread_info *)(sp & ~(THREAD_SIZE-1)); | |
98 | } | |
99 | ||
100 | /* thread information allocation */ | |
101 | #endif /* __ASSEMBLY__ */ | |
102 | ||
4684dade MS |
103 | /* |
104 | * thread information flags | |
105 | * - these are process state flags that various assembly files may | |
106 | * need to access | |
107 | * - pending work-to-be-done flags are in LSW | |
108 | * - other flags in MSW | |
109 | */ | |
110 | #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ | |
111 | #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ | |
112 | #define TIF_SIGPENDING 2 /* signal pending */ | |
113 | #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ | |
114 | /* restore singlestep on return to user mode */ | |
115 | #define TIF_SINGLESTEP 4 | |
0ddc9324 | 116 | #define TIF_MEMDIE 6 /* is terminating due to OOM killer */ |
0945f98b EI |
117 | #define TIF_SYSCALL_AUDIT 9 /* syscall auditing active */ |
118 | #define TIF_SECCOMP 10 /* secure computing */ | |
4684dade | 119 | |
4684dade MS |
120 | /* true if poll_idle() is polling TIF_NEED_RESCHED */ |
121 | #define TIF_POLLING_NRFLAG 16 | |
122 | ||
95d3a8cd MS |
123 | #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) |
124 | #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) | |
125 | #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) | |
126 | #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) | |
127 | #define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP) | |
95d3a8cd | 128 | #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) |
0945f98b EI |
129 | #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) |
130 | #define _TIF_SECCOMP (1 << TIF_SECCOMP) | |
4684dade | 131 | |
0945f98b EI |
132 | /* work to do in syscall trace */ |
133 | #define _TIF_WORK_SYSCALL_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \ | |
134 | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP) | |
135 | ||
4684dade MS |
136 | /* work to do on interrupt/exception return */ |
137 | #define _TIF_WORK_MASK 0x0000FFFE | |
0945f98b | 138 | |
4684dade MS |
139 | /* work to do on any return to u-space */ |
140 | #define _TIF_ALLWORK_MASK 0x0000FFFF | |
141 | ||
142 | /* | |
143 | * Thread-synchronous status. | |
144 | * | |
145 | * This is different from the flags in that nobody else | |
146 | * ever touches our thread-synchronous status, so we don't | |
147 | * have to worry about atomic accesses. | |
148 | */ | |
149 | /* FPU was used by this task this quantum (SMP) */ | |
150 | #define TS_USEDFPU 0x0001 | |
a6029d1c MS |
151 | #define TS_RESTORE_SIGMASK 0x0002 |
152 | ||
153 | #ifndef __ASSEMBLY__ | |
154 | #define HAVE_SET_RESTORE_SIGMASK 1 | |
155 | static inline void set_restore_sigmask(void) | |
156 | { | |
157 | struct thread_info *ti = current_thread_info(); | |
158 | ti->status |= TS_RESTORE_SIGMASK; | |
edd63a27 | 159 | WARN_ON(!test_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags)); |
a6029d1c | 160 | } |
4ebefe3e AV |
161 | static inline void clear_restore_sigmask(void) |
162 | { | |
163 | current_thread_info()->status &= ~TS_RESTORE_SIGMASK; | |
164 | } | |
165 | static inline bool test_restore_sigmask(void) | |
166 | { | |
167 | return current_thread_info()->status & TS_RESTORE_SIGMASK; | |
168 | } | |
169 | static inline bool test_and_clear_restore_sigmask(void) | |
170 | { | |
171 | struct thread_info *ti = current_thread_info(); | |
172 | if (!(ti->status & TS_RESTORE_SIGMASK)) | |
173 | return false; | |
174 | ti->status &= ~TS_RESTORE_SIGMASK; | |
175 | return true; | |
176 | } | |
a6029d1c | 177 | #endif |
4684dade MS |
178 | |
179 | #endif /* __KERNEL__ */ | |
180 | #endif /* _ASM_MICROBLAZE_THREAD_INFO_H */ |