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 	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 */
99 static 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 /*
110  * thread information flags
111  * - these are process state flags that various assembly files may
112  *   need to access
113  * - pending work-to-be-done flags are in LSW
114  * - other flags in MSW
115  */
116 #define TIF_SYSCALL_TRACE	0 /* syscall trace active */
117 #define TIF_NOTIFY_RESUME	1 /* resumption notification requested */
118 #define TIF_SIGPENDING		2 /* signal pending */
119 #define TIF_NEED_RESCHED	3 /* rescheduling necessary */
120 /* restore singlestep on return to user mode */
121 #define TIF_SINGLESTEP		4
122 #define TIF_MEMDIE		6	/* is terminating due to OOM killer */
123 #define TIF_SYSCALL_AUDIT	9       /* syscall auditing active */
124 #define TIF_SECCOMP		10      /* secure computing */
125 
126 /* true if poll_idle() is polling TIF_NEED_RESCHED */
127 #define TIF_POLLING_NRFLAG	16
128 
129 #define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
130 #define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
131 #define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
132 #define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
133 #define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
134 #define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
135 #define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
136 #define _TIF_SECCOMP		(1 << TIF_SECCOMP)
137 
138 /* work to do in syscall trace */
139 #define _TIF_WORK_SYSCALL_MASK  (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
140 				 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP)
141 
142 /* work to do on interrupt/exception return */
143 #define _TIF_WORK_MASK		0x0000FFFE
144 
145 /* work to do on any return to u-space */
146 #define _TIF_ALLWORK_MASK	0x0000FFFF
147 
148 /*
149  * Thread-synchronous status.
150  *
151  * This is different from the flags in that nobody else
152  * ever touches our thread-synchronous status, so we don't
153  * have to worry about atomic accesses.
154  */
155 /* FPU was used by this task this quantum (SMP) */
156 #define TS_USEDFPU		0x0001
157 #define TS_RESTORE_SIGMASK	0x0002
158 
159 #ifndef __ASSEMBLY__
160 #define HAVE_SET_RESTORE_SIGMASK 1
161 static inline void set_restore_sigmask(void)
162 {
163 	struct thread_info *ti = current_thread_info();
164 	ti->status |= TS_RESTORE_SIGMASK;
165 	WARN_ON(!test_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags));
166 }
167 static inline void clear_restore_sigmask(void)
168 {
169 	current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
170 }
171 static inline bool test_restore_sigmask(void)
172 {
173 	return current_thread_info()->status & TS_RESTORE_SIGMASK;
174 }
175 static inline bool test_and_clear_restore_sigmask(void)
176 {
177 	struct thread_info *ti = current_thread_info();
178 	if (!(ti->status & TS_RESTORE_SIGMASK))
179 		return false;
180 	ti->status &= ~TS_RESTORE_SIGMASK;
181 	return true;
182 }
183 #endif
184 
185 #endif /* __KERNEL__ */
186 #endif /* _ASM_MICROBLAZE_THREAD_INFO_H */
187