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	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 */
73
74	struct cpu_context	cpu_context;
75};
76
77/*
78 * macros/functions for gaining access to the thread information structure
79 */
80#define INIT_THREAD_INFO(tsk)			\
81{						\
82	.task		= &tsk,			\
83	.flags		= 0,			\
84	.cpu		= 0,			\
85	.preempt_count	= INIT_PREEMPT_COUNT,	\
86	.addr_limit	= KERNEL_DS,		\
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 */
93static 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
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
116#define TIF_MEMDIE		6	/* is terminating due to OOM killer */
117#define TIF_SYSCALL_AUDIT	9       /* syscall auditing active */
118#define TIF_SECCOMP		10      /* secure computing */
119
120/* true if poll_idle() is polling TIF_NEED_RESCHED */
121#define TIF_POLLING_NRFLAG	16
122
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)
128#define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
129#define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
130#define _TIF_SECCOMP		(1 << TIF_SECCOMP)
131
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
136/* work to do on interrupt/exception return */
137#define _TIF_WORK_MASK		0x0000FFFE
138
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
151#define TS_RESTORE_SIGMASK	0x0002
152
153#ifndef __ASSEMBLY__
154#define HAVE_SET_RESTORE_SIGMASK 1
155static inline void set_restore_sigmask(void)
156{
157	struct thread_info *ti = current_thread_info();
158	ti->status |= TS_RESTORE_SIGMASK;
159	WARN_ON(!test_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags));
160}
161static inline void clear_restore_sigmask(void)
162{
163	current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
164}
165static inline bool test_restore_sigmask(void)
166{
167	return current_thread_info()->status & TS_RESTORE_SIGMASK;
168}
169static 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}
177#endif
178
179#endif /* __KERNEL__ */
180#endif /* _ASM_MICROBLAZE_THREAD_INFO_H */
181