1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * OpenRISC Linux
4 *
5 * Linux architectural port borrowing liberally from similar works of
6 * others.  All original copyrights apply as per the original source
7 * declaration.
8 *
9 * OpenRISC implementation:
10 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
11 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
12 * et al.
13 */
14
15#ifndef _ASM_THREAD_INFO_H
16#define _ASM_THREAD_INFO_H
17
18#ifdef __KERNEL__
19
20#ifndef __ASSEMBLY__
21#include <asm/types.h>
22#include <asm/processor.h>
23#endif
24
25
26/* THREAD_SIZE is the size of the task_struct/kernel_stack combo.
27 * normally, the stack is found by doing something like p + THREAD_SIZE
28 * in or1k, a page is 8192 bytes, which seems like a sane size
29 */
30
31#define THREAD_SIZE_ORDER 0
32#define THREAD_SIZE       (PAGE_SIZE << THREAD_SIZE_ORDER)
33
34/*
35 * low level task data that entry.S needs immediate access to
36 * - this struct should fit entirely inside of one cache line
37 * - this struct shares the supervisor stack pages
38 * - if the contents of this structure are changed, the assembly constants
39 *   must also be changed
40 */
41#ifndef __ASSEMBLY__
42
43struct thread_info {
44	struct task_struct	*task;		/* main task structure */
45	unsigned long		flags;		/* low level flags */
46	__u32			cpu;		/* current CPU */
47	__s32			preempt_count; /* 0 => preemptable, <0 => BUG */
48
49	__u8			supervisor_stack[0];
50
51	/* saved context data */
52	unsigned long           ksp;
53};
54#endif
55
56/*
57 * macros/functions for gaining access to the thread information structure
58 *
59 * preempt_count needs to be 1 initially, until the scheduler is functional.
60 */
61#ifndef __ASSEMBLY__
62#define INIT_THREAD_INFO(tsk)				\
63{							\
64	.task		= &tsk,				\
65	.flags		= 0,				\
66	.cpu		= 0,				\
67	.preempt_count	= INIT_PREEMPT_COUNT,		\
68	.ksp            = 0,                            \
69}
70
71/* how to get the thread information struct from C */
72register struct thread_info *current_thread_info_reg asm("r10");
73#define current_thread_info()   (current_thread_info_reg)
74
75#define get_thread_info(ti) get_task_struct((ti)->task)
76#define put_thread_info(ti) put_task_struct((ti)->task)
77
78#endif /* !__ASSEMBLY__ */
79
80/*
81 * thread information flags
82 *   these are process state flags that various assembly files may need to
83 *   access
84 *   - pending work-to-be-done flags are in LSW
85 *   - other flags in MSW
86 */
87#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
88#define TIF_NOTIFY_RESUME	1	/* resumption notification requested */
89#define TIF_SIGPENDING		2	/* signal pending */
90#define TIF_NEED_RESCHED	3	/* rescheduling necessary */
91#define TIF_SINGLESTEP		4	/* restore singlestep on return to user
92					 * mode
93					 */
94#define TIF_NOTIFY_SIGNAL	5	/* signal notifications exist */
95#define TIF_SYSCALL_TRACEPOINT  8       /* for ftrace syscall instrumentation */
96#define TIF_RESTORE_SIGMASK     9
97#define TIF_POLLING_NRFLAG	16	/* true if poll_idle() is polling						 * TIF_NEED_RESCHED
98					 */
99#define TIF_MEMDIE              17
100
101#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
102#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
103#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
104#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
105#define _TIF_SINGLESTEP		(1<<TIF_SINGLESTEP)
106#define _TIF_NOTIFY_SIGNAL	(1<<TIF_NOTIFY_SIGNAL)
107#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
108
109
110/* Work to do when returning from interrupt/exception */
111/* For OpenRISC, this is anything in the LSW other than syscall trace */
112#define _TIF_WORK_MASK (0xff & ~(_TIF_SYSCALL_TRACE|_TIF_SINGLESTEP))
113
114#endif /* __KERNEL__ */
115
116#endif /* _ASM_THREAD_INFO_H */
117