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 or32, 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
43typedef unsigned long mm_segment_t;
44
45struct thread_info {
46	struct task_struct	*task;		/* main task structure */
47	unsigned long		flags;		/* low level flags */
48	__u32			cpu;		/* current CPU */
49	__s32			preempt_count; /* 0 => preemptable, <0 => BUG */
50
51	mm_segment_t		addr_limit; /* thread address space:
52					       0-0x7FFFFFFF for user-thead
53					       0-0xFFFFFFFF for kernel-thread
54					     */
55	__u8			supervisor_stack[0];
56
57	/* saved context data */
58	unsigned long           ksp;
59};
60#endif
61
62/*
63 * macros/functions for gaining access to the thread information structure
64 *
65 * preempt_count needs to be 1 initially, until the scheduler is functional.
66 */
67#ifndef __ASSEMBLY__
68#define INIT_THREAD_INFO(tsk)				\
69{							\
70	.task		= &tsk,				\
71	.flags		= 0,				\
72	.cpu		= 0,				\
73	.preempt_count	= INIT_PREEMPT_COUNT,		\
74	.addr_limit	= KERNEL_DS,			\
75	.ksp            = 0,                            \
76}
77
78/* how to get the thread information struct from C */
79register struct thread_info *current_thread_info_reg asm("r10");
80#define current_thread_info()   (current_thread_info_reg)
81
82#define get_thread_info(ti) get_task_struct((ti)->task)
83#define put_thread_info(ti) put_task_struct((ti)->task)
84
85#endif /* !__ASSEMBLY__ */
86
87/*
88 * thread information flags
89 *   these are process state flags that various assembly files may need to
90 *   access
91 *   - pending work-to-be-done flags are in LSW
92 *   - other flags in MSW
93 */
94#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
95#define TIF_NOTIFY_RESUME	1	/* resumption notification requested */
96#define TIF_SIGPENDING		2	/* signal pending */
97#define TIF_NEED_RESCHED	3	/* rescheduling necessary */
98#define TIF_SINGLESTEP		4	/* restore singlestep on return to user
99					 * mode
100					 */
101#define TIF_NOTIFY_SIGNAL	5	/* signal notifications exist */
102#define TIF_SYSCALL_TRACEPOINT  8       /* for ftrace syscall instrumentation */
103#define TIF_RESTORE_SIGMASK     9
104#define TIF_POLLING_NRFLAG	16	/* true if poll_idle() is polling						 * TIF_NEED_RESCHED
105					 */
106#define TIF_MEMDIE              17
107
108#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
109#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
110#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
111#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
112#define _TIF_SINGLESTEP		(1<<TIF_SINGLESTEP)
113#define _TIF_NOTIFY_SIGNAL	(1<<TIF_NOTIFY_SIGNAL)
114#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
115
116
117/* Work to do when returning from interrupt/exception */
118/* For OpenRISC, this is anything in the LSW other than syscall trace */
119#define _TIF_WORK_MASK (0xff & ~(_TIF_SYSCALL_TRACE|_TIF_SINGLESTEP))
120
121#endif /* __KERNEL__ */
122
123#endif /* _ASM_THREAD_INFO_H */
124