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>
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
62 typedef struct {
63 unsigned long seg;
64 } mm_segment_t;
65
66 struct thread_info {
67 struct task_struct *task; /* main task structure */
68 struct exec_domain *exec_domain; /* execution domain */
69 unsigned long flags; /* low level flags */
70 unsigned long status; /* thread-synchronous flags */
71 __u32 cpu; /* current CPU */
72 __s32 preempt_count; /* 0 => preemptable,< 0 => BUG*/
73 mm_segment_t addr_limit; /* thread address space */
74
75 struct cpu_context cpu_context;
76 };
77
78 /*
79 * macros/functions for gaining access to the thread information structure
80 */
81 #define INIT_THREAD_INFO(tsk) \
82 { \
83 .task = &tsk, \
84 .exec_domain = &default_exec_domain, \
85 .flags = 0, \
86 .cpu = 0, \
87 .preempt_count = INIT_PREEMPT_COUNT, \
88 .addr_limit = KERNEL_DS, \
89 }
90
91 #define init_thread_info (init_thread_union.thread_info)
92 #define init_stack (init_thread_union.stack)
93
94 /* how to get the thread information struct from C */
current_thread_info(void)95 static inline struct thread_info *current_thread_info(void)
96 {
97 register unsigned long sp asm("r1");
98
99 return (struct thread_info *)(sp & ~(THREAD_SIZE-1));
100 }
101
102 /* thread information allocation */
103 #endif /* __ASSEMBLY__ */
104
105 /*
106 * thread information flags
107 * - these are process state flags that various assembly files may
108 * need to access
109 * - pending work-to-be-done flags are in LSW
110 * - other flags in MSW
111 */
112 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
113 #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
114 #define TIF_SIGPENDING 2 /* signal pending */
115 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */
116 /* restore singlestep on return to user mode */
117 #define TIF_SINGLESTEP 4
118 #define TIF_MEMDIE 6 /* is terminating due to OOM killer */
119 #define TIF_SYSCALL_AUDIT 9 /* syscall auditing active */
120 #define TIF_SECCOMP 10 /* secure computing */
121
122 /* true if poll_idle() is polling TIF_NEED_RESCHED */
123 #define TIF_POLLING_NRFLAG 16
124
125 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
126 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
127 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
128 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
129 #define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
130 #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
131 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
132 #define _TIF_SECCOMP (1 << TIF_SECCOMP)
133
134 /* work to do in syscall trace */
135 #define _TIF_WORK_SYSCALL_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
136 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP)
137
138 /* work to do on interrupt/exception return */
139 #define _TIF_WORK_MASK 0x0000FFFE
140
141 /* work to do on any return to u-space */
142 #define _TIF_ALLWORK_MASK 0x0000FFFF
143
144 /*
145 * Thread-synchronous status.
146 *
147 * This is different from the flags in that nobody else
148 * ever touches our thread-synchronous status, so we don't
149 * have to worry about atomic accesses.
150 */
151 /* FPU was used by this task this quantum (SMP) */
152 #define TS_USEDFPU 0x0001
153 #define TS_RESTORE_SIGMASK 0x0002
154
155 #ifndef __ASSEMBLY__
156 #define HAVE_SET_RESTORE_SIGMASK 1
set_restore_sigmask(void)157 static inline void set_restore_sigmask(void)
158 {
159 struct thread_info *ti = current_thread_info();
160 ti->status |= TS_RESTORE_SIGMASK;
161 WARN_ON(!test_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags));
162 }
clear_restore_sigmask(void)163 static inline void clear_restore_sigmask(void)
164 {
165 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
166 }
test_restore_sigmask(void)167 static inline bool test_restore_sigmask(void)
168 {
169 return current_thread_info()->status & TS_RESTORE_SIGMASK;
170 }
test_and_clear_restore_sigmask(void)171 static inline bool test_and_clear_restore_sigmask(void)
172 {
173 struct thread_info *ti = current_thread_info();
174 if (!(ti->status & TS_RESTORE_SIGMASK))
175 return false;
176 ti->status &= ~TS_RESTORE_SIGMASK;
177 return true;
178 }
179 #endif
180
181 #endif /* __KERNEL__ */
182 #endif /* _ASM_MICROBLAZE_THREAD_INFO_H */
183