1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * thread_info.h: LoongArch low-level thread information
4 *
5 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
6 */
7
8#ifndef _ASM_THREAD_INFO_H
9#define _ASM_THREAD_INFO_H
10
11#ifdef __KERNEL__
12
13#ifndef __ASSEMBLY__
14
15#include <asm/processor.h>
16
17/*
18 * low level task data that entry.S needs immediate access to
19 * - this struct should fit entirely inside of one cache line
20 * - this struct shares the supervisor stack pages
21 * - if the contents of this structure are changed, the assembly constants
22 *   must also be changed
23 */
24struct thread_info {
25	struct task_struct	*task;		/* main task structure */
26	unsigned long		flags;		/* low level flags */
27	unsigned long		tp_value;	/* thread pointer */
28	__u32			cpu;		/* current CPU */
29	int			preempt_count;	/* 0 => preemptible, <0 => BUG */
30	struct pt_regs		*regs;
31	unsigned long		syscall;	/* syscall number */
32	unsigned long		syscall_work;	/* SYSCALL_WORK_ flags */
33};
34
35/*
36 * macros/functions for gaining access to the thread information structure
37 */
38#define INIT_THREAD_INFO(tsk)			\
39{						\
40	.task		= &tsk,			\
41	.flags		= _TIF_FIXADE,		\
42	.cpu		= 0,			\
43	.preempt_count	= INIT_PREEMPT_COUNT,	\
44}
45
46/* How to get the thread information struct from C. */
47register struct thread_info *__current_thread_info __asm__("$tp");
48
49static inline struct thread_info *current_thread_info(void)
50{
51	return __current_thread_info;
52}
53
54register unsigned long current_stack_pointer __asm__("$sp");
55
56#endif /* !__ASSEMBLY__ */
57
58/* thread information allocation */
59#define THREAD_SIZE		SZ_16K
60#define THREAD_MASK		(THREAD_SIZE - 1UL)
61#define THREAD_SIZE_ORDER	ilog2(THREAD_SIZE / PAGE_SIZE)
62/*
63 * thread information flags
64 * - these are process state flags that various assembly files may need to
65 *   access
66 * - pending work-to-be-done flags are in LSW
67 * - other flags in MSW
68 */
69#define TIF_SIGPENDING		1	/* signal pending */
70#define TIF_NEED_RESCHED	2	/* rescheduling necessary */
71#define TIF_NOTIFY_RESUME	3	/* callback before returning to user */
72#define TIF_NOTIFY_SIGNAL	4	/* signal notifications exist */
73#define TIF_RESTORE_SIGMASK	5	/* restore signal mask in do_signal() */
74#define TIF_NOHZ		6	/* in adaptive nohz mode */
75#define TIF_UPROBE		7	/* breakpointed or singlestepping */
76#define TIF_USEDFPU		8	/* FPU was used by this task this quantum (SMP) */
77#define TIF_USEDSIMD		9	/* SIMD has been used this quantum */
78#define TIF_MEMDIE		10	/* is terminating due to OOM killer */
79#define TIF_FIXADE		11	/* Fix address errors in software */
80#define TIF_LOGADE		12	/* Log address errors to syslog */
81#define TIF_32BIT_REGS		13	/* 32-bit general purpose registers */
82#define TIF_32BIT_ADDR		14	/* 32-bit address space */
83#define TIF_LOAD_WATCH		15	/* If set, load watch registers */
84#define TIF_SINGLESTEP		16	/* Single Step */
85#define TIF_LSX_CTX_LIVE	17	/* LSX context must be preserved */
86#define TIF_LASX_CTX_LIVE	18	/* LASX context must be preserved */
87#define TIF_USEDLBT		19	/* LBT was used by this task this quantum (SMP) */
88#define TIF_LBT_CTX_LIVE	20	/* LBT context must be preserved */
89#define TIF_PATCH_PENDING	21	/* pending live patching update */
90
91#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
92#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
93#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
94#define _TIF_NOTIFY_SIGNAL	(1<<TIF_NOTIFY_SIGNAL)
95#define _TIF_NOHZ		(1<<TIF_NOHZ)
96#define _TIF_UPROBE		(1<<TIF_UPROBE)
97#define _TIF_USEDFPU		(1<<TIF_USEDFPU)
98#define _TIF_USEDSIMD		(1<<TIF_USEDSIMD)
99#define _TIF_FIXADE		(1<<TIF_FIXADE)
100#define _TIF_LOGADE		(1<<TIF_LOGADE)
101#define _TIF_32BIT_REGS		(1<<TIF_32BIT_REGS)
102#define _TIF_32BIT_ADDR		(1<<TIF_32BIT_ADDR)
103#define _TIF_LOAD_WATCH		(1<<TIF_LOAD_WATCH)
104#define _TIF_SINGLESTEP		(1<<TIF_SINGLESTEP)
105#define _TIF_LSX_CTX_LIVE	(1<<TIF_LSX_CTX_LIVE)
106#define _TIF_LASX_CTX_LIVE	(1<<TIF_LASX_CTX_LIVE)
107#define _TIF_USEDLBT		(1<<TIF_USEDLBT)
108#define _TIF_LBT_CTX_LIVE	(1<<TIF_LBT_CTX_LIVE)
109#define _TIF_PATCH_PENDING	(1<<TIF_PATCH_PENDING)
110
111#endif /* __KERNEL__ */
112#endif /* _ASM_THREAD_INFO_H */
113