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
59typedef struct {
60	unsigned long seg;
61} mm_segment_t;
62
63struct thread_info {
64	struct task_struct	*task; /* main task structure */
65	unsigned long		flags; /* low level flags */
66	unsigned long		status; /* thread-synchronous flags */
67	__u32			cpu; /* current CPU */
68	__s32			preempt_count; /* 0 => preemptable,< 0 => BUG*/
69	mm_segment_t		addr_limit; /* thread address space */
70
71	struct cpu_context	cpu_context;
72};
73
74/*
75 * macros/functions for gaining access to the thread information structure
76 */
77#define INIT_THREAD_INFO(tsk)			\
78{						\
79	.task		= &tsk,			\
80	.flags		= 0,			\
81	.cpu		= 0,			\
82	.preempt_count	= INIT_PREEMPT_COUNT,	\
83	.addr_limit	= KERNEL_DS,		\
84}
85
86/* how to get the thread information struct from C */
87static inline struct thread_info *current_thread_info(void)
88{
89	register unsigned long sp asm("r1");
90
91	return (struct thread_info *)(sp & ~(THREAD_SIZE-1));
92}
93
94/* thread information allocation */
95#endif /* __ASSEMBLY__ */
96
97/*
98 * thread information flags
99 * - these are process state flags that various assembly files may
100 *   need to access
101 * - pending work-to-be-done flags are in LSW
102 * - other flags in MSW
103 */
104#define TIF_SYSCALL_TRACE	0 /* syscall trace active */
105#define TIF_NOTIFY_RESUME	1 /* resumption notification requested */
106#define TIF_SIGPENDING		2 /* signal pending */
107#define TIF_NEED_RESCHED	3 /* rescheduling necessary */
108/* restore singlestep on return to user mode */
109#define TIF_SINGLESTEP		4
110#define TIF_NOTIFY_SIGNAL	5	/* signal notifications exist */
111#define TIF_MEMDIE		6	/* is terminating due to OOM killer */
112#define TIF_SYSCALL_AUDIT	9       /* syscall auditing active */
113#define TIF_SECCOMP		10      /* secure computing */
114
115/* true if poll_idle() is polling TIF_NEED_RESCHED */
116#define TIF_POLLING_NRFLAG	16
117
118#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
119#define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
120#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
121#define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
122#define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
123#define _TIF_NOTIFY_SIGNAL	(1 << TIF_NOTIFY_SIGNAL)
124#define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
125#define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
126#define _TIF_SECCOMP		(1 << TIF_SECCOMP)
127
128/* work to do in syscall trace */
129#define _TIF_WORK_SYSCALL_MASK  (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
130				 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP)
131
132/* work to do on interrupt/exception return */
133#define _TIF_WORK_MASK		0x0000FFFE
134
135/* work to do on any return to u-space */
136#define _TIF_ALLWORK_MASK	0x0000FFFF
137
138/*
139 * Thread-synchronous status.
140 *
141 * This is different from the flags in that nobody else
142 * ever touches our thread-synchronous status, so we don't
143 * have to worry about atomic accesses.
144 */
145/* FPU was used by this task this quantum (SMP) */
146#define TS_USEDFPU		0x0001
147
148#endif /* __KERNEL__ */
149#endif /* _ASM_MICROBLAZE_THREAD_INFO_H */
150