Linux kernel mirror (for testing)
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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
31struct 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
62typedef struct {
63 unsigned long seg;
64} mm_segment_t;
65
66struct 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 struct restart_block restart_block;
75
76 struct cpu_context cpu_context;
77};
78
79/*
80 * macros/functions for gaining access to the thread information structure
81 */
82#define INIT_THREAD_INFO(tsk) \
83{ \
84 .task = &tsk, \
85 .exec_domain = &default_exec_domain, \
86 .flags = 0, \
87 .cpu = 0, \
88 .preempt_count = INIT_PREEMPT_COUNT, \
89 .addr_limit = KERNEL_DS, \
90 .restart_block = { \
91 .fn = do_no_restart_syscall, \
92 }, \
93}
94
95#define init_thread_info (init_thread_union.thread_info)
96#define init_stack (init_thread_union.stack)
97
98/* how to get the thread information struct from C */
99static inline struct thread_info *current_thread_info(void)
100{
101 register unsigned long sp asm("r1");
102
103 return (struct thread_info *)(sp & ~(THREAD_SIZE-1));
104}
105
106/* thread information allocation */
107#endif /* __ASSEMBLY__ */
108
109#define PREEMPT_ACTIVE 0x10000000
110
111/*
112 * thread information flags
113 * - these are process state flags that various assembly files may
114 * need to access
115 * - pending work-to-be-done flags are in LSW
116 * - other flags in MSW
117 */
118#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
119#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
120#define TIF_SIGPENDING 2 /* signal pending */
121#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
122/* restore singlestep on return to user mode */
123#define TIF_SINGLESTEP 4
124#define TIF_IRET 5 /* return with iret */
125#define TIF_MEMDIE 6 /* is terminating due to OOM killer */
126#define TIF_SYSCALL_AUDIT 9 /* syscall auditing active */
127#define TIF_SECCOMP 10 /* secure computing */
128
129/* true if poll_idle() is polling TIF_NEED_RESCHED */
130#define TIF_POLLING_NRFLAG 16
131
132#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
133#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
134#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
135#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
136#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
137#define _TIF_IRET (1 << TIF_IRET)
138#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
139#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
140#define _TIF_SECCOMP (1 << TIF_SECCOMP)
141
142/* work to do in syscall trace */
143#define _TIF_WORK_SYSCALL_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
144 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP)
145
146/* work to do on interrupt/exception return */
147#define _TIF_WORK_MASK 0x0000FFFE
148
149/* work to do on any return to u-space */
150#define _TIF_ALLWORK_MASK 0x0000FFFF
151
152/*
153 * Thread-synchronous status.
154 *
155 * This is different from the flags in that nobody else
156 * ever touches our thread-synchronous status, so we don't
157 * have to worry about atomic accesses.
158 */
159/* FPU was used by this task this quantum (SMP) */
160#define TS_USEDFPU 0x0001
161#define TS_RESTORE_SIGMASK 0x0002
162
163#ifndef __ASSEMBLY__
164#define HAVE_SET_RESTORE_SIGMASK 1
165static inline void set_restore_sigmask(void)
166{
167 struct thread_info *ti = current_thread_info();
168 ti->status |= TS_RESTORE_SIGMASK;
169 WARN_ON(!test_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags));
170}
171static inline void clear_restore_sigmask(void)
172{
173 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
174}
175static inline bool test_restore_sigmask(void)
176{
177 return current_thread_info()->status & TS_RESTORE_SIGMASK;
178}
179static inline bool test_and_clear_restore_sigmask(void)
180{
181 struct thread_info *ti = current_thread_info();
182 if (!(ti->status & TS_RESTORE_SIGMASK))
183 return false;
184 ti->status &= ~TS_RESTORE_SIGMASK;
185 return true;
186}
187#endif
188
189#endif /* __KERNEL__ */
190#endif /* _ASM_MICROBLAZE_THREAD_INFO_H */