1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright (C) 2006 Atmark Techno, Inc.
4 */
5
6#ifndef _ASM_MICROBLAZE_THREAD_INFO_H
7#define _ASM_MICROBLAZE_THREAD_INFO_H
8
9#ifdef __KERNEL__
10
11/* we have 8k stack */
12#define THREAD_SHIFT		13
13#define THREAD_SIZE		(1 << THREAD_SHIFT)
14#define THREAD_SIZE_ORDER	1
15
16#ifndef __ASSEMBLY__
17# include <linux/types.h>
18# include <asm/processor.h>
19
20/*
21 * low level task data that entry.S needs immediate access to
22 * - this struct should fit entirely inside of one cache line
23 * - this struct shares the supervisor stack pages
24 * - if the contents of this structure are changed, the assembly constants
25 *	 must also be changed
26 */
27
28struct cpu_context {
29	__u32	r1; /* stack pointer */
30	__u32	r2;
31	/* dedicated registers */
32	__u32	r13;
33	__u32	r14;
34	__u32	r15;
35	__u32	r16;
36	__u32	r17;
37	__u32	r18;
38	/* non-volatile registers */
39	__u32	r19;
40	__u32	r20;
41	__u32	r21;
42	__u32	r22;
43	__u32	r23;
44	__u32	r24;
45	__u32	r25;
46	__u32	r26;
47	__u32	r27;
48	__u32	r28;
49	__u32	r29;
50	__u32	r30;
51	/* r31 is used as current task pointer */
52	/* special purpose registers */
53	__u32	msr;
54	__u32	ear;
55	__u32	esr;
56	__u32	fsr;
57};
58
59struct thread_info {
60	struct task_struct	*task; /* main task structure */
61	unsigned long		flags; /* low level flags */
62	unsigned long		status; /* thread-synchronous flags */
63	__u32			cpu; /* current CPU */
64	__s32			preempt_count; /* 0 => preemptable,< 0 => BUG*/
65
66	struct cpu_context	cpu_context;
67};
68
69/*
70 * macros/functions for gaining access to the thread information structure
71 */
72#define INIT_THREAD_INFO(tsk)			\
73{						\
74	.task		= &tsk,			\
75	.flags		= 0,			\
76	.cpu		= 0,			\
77	.preempt_count	= INIT_PREEMPT_COUNT,	\
78}
79
80/* how to get the thread information struct from C */
81static inline struct thread_info *current_thread_info(void)
82{
83	register unsigned long sp asm("r1");
84
85	return (struct thread_info *)(sp & ~(THREAD_SIZE-1));
86}
87
88/* thread information allocation */
89#endif /* __ASSEMBLY__ */
90
91/*
92 * thread information flags
93 * - these are process state flags that various assembly files may
94 *   need to access
95 * - pending work-to-be-done flags are in LSW
96 * - other flags in MSW
97 */
98#define TIF_SYSCALL_TRACE	0 /* syscall trace active */
99#define TIF_NOTIFY_RESUME	1 /* resumption notification requested */
100#define TIF_SIGPENDING		2 /* signal pending */
101#define TIF_NEED_RESCHED	3 /* rescheduling necessary */
102/* restore singlestep on return to user mode */
103#define TIF_SINGLESTEP		4
104#define TIF_NOTIFY_SIGNAL	5	/* signal notifications exist */
105#define TIF_MEMDIE		6	/* is terminating due to OOM killer */
106#define TIF_SYSCALL_AUDIT	9       /* syscall auditing active */
107#define TIF_SECCOMP		10      /* secure computing */
108
109/* true if poll_idle() is polling TIF_NEED_RESCHED */
110#define TIF_POLLING_NRFLAG	16
111
112#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
113#define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
114#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
115#define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
116#define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
117#define _TIF_NOTIFY_SIGNAL	(1 << TIF_NOTIFY_SIGNAL)
118#define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
119#define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
120#define _TIF_SECCOMP		(1 << TIF_SECCOMP)
121
122/* work to do in syscall trace */
123#define _TIF_WORK_SYSCALL_MASK  (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
124				 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP)
125
126/* work to do on interrupt/exception return */
127#define _TIF_WORK_MASK		0x0000FFFE
128
129/* work to do on any return to u-space */
130#define _TIF_ALLWORK_MASK	0x0000FFFF
131
132/*
133 * Thread-synchronous status.
134 *
135 * This is different from the flags in that nobody else
136 * ever touches our thread-synchronous status, so we don't
137 * have to worry about atomic accesses.
138 */
139/* FPU was used by this task this quantum (SMP) */
140#define TS_USEDFPU		0x0001
141
142#endif /* __KERNEL__ */
143#endif /* _ASM_MICROBLAZE_THREAD_INFO_H */
144