1/*
2 * Based on arch/arm/include/asm/thread_info.h
3 *
4 * Copyright (C) 2002 Russell King.
5 * Copyright (C) 2012 ARM Ltd.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
18 */
19#ifndef __ASM_THREAD_INFO_H
20#define __ASM_THREAD_INFO_H
21
22#ifdef __KERNEL__
23
24#include <linux/compiler.h>
25
26#ifndef CONFIG_ARM64_64K_PAGES
27#define THREAD_SIZE_ORDER	2
28#endif
29
30#define THREAD_SIZE		16384
31#define THREAD_START_SP		(THREAD_SIZE - 16)
32
33#ifndef __ASSEMBLY__
34
35struct task_struct;
36struct exec_domain;
37
38#include <asm/types.h>
39
40typedef unsigned long mm_segment_t;
41
42/*
43 * low level task data that entry.S needs immediate access to.
44 * __switch_to() assumes cpu_context follows immediately after cpu_domain.
45 */
46struct thread_info {
47	unsigned long		flags;		/* low level flags */
48	mm_segment_t		addr_limit;	/* address limit */
49	struct task_struct	*task;		/* main task structure */
50	struct exec_domain	*exec_domain;	/* execution domain */
51	struct restart_block	restart_block;
52	int			preempt_count;	/* 0 => preemptable, <0 => bug */
53	int			cpu;		/* cpu */
54};
55
56#define INIT_THREAD_INFO(tsk)						\
57{									\
58	.task		= &tsk,						\
59	.exec_domain	= &default_exec_domain,				\
60	.flags		= 0,						\
61	.preempt_count	= INIT_PREEMPT_COUNT,				\
62	.addr_limit	= KERNEL_DS,					\
63	.restart_block	= {						\
64		.fn	= do_no_restart_syscall,			\
65	},								\
66}
67
68#define init_thread_info	(init_thread_union.thread_info)
69#define init_stack		(init_thread_union.stack)
70
71/*
72 * how to get the current stack pointer from C
73 */
74register unsigned long current_stack_pointer asm ("sp");
75
76/*
77 * how to get the thread information struct from C
78 */
79static inline struct thread_info *current_thread_info(void) __attribute_const__;
80
81static inline struct thread_info *current_thread_info(void)
82{
83	return (struct thread_info *)
84		(current_stack_pointer & ~(THREAD_SIZE - 1));
85}
86
87#define thread_saved_pc(tsk)	\
88	((unsigned long)(tsk->thread.cpu_context.pc))
89#define thread_saved_sp(tsk)	\
90	((unsigned long)(tsk->thread.cpu_context.sp))
91#define thread_saved_fp(tsk)	\
92	((unsigned long)(tsk->thread.cpu_context.fp))
93
94#endif
95
96/*
97 * thread information flags:
98 *  TIF_SYSCALL_TRACE	- syscall trace active
99 *  TIF_SYSCALL_TRACEPOINT - syscall tracepoint for ftrace
100 *  TIF_SYSCALL_AUDIT	- syscall auditing
101 *  TIF_SECOMP		- syscall secure computing
102 *  TIF_SIGPENDING	- signal pending
103 *  TIF_NEED_RESCHED	- rescheduling necessary
104 *  TIF_NOTIFY_RESUME	- callback before returning to user
105 *  TIF_USEDFPU		- FPU was used by this task this quantum (SMP)
106 */
107#define TIF_SIGPENDING		0
108#define TIF_NEED_RESCHED	1
109#define TIF_NOTIFY_RESUME	2	/* callback before returning to user */
110#define TIF_FOREIGN_FPSTATE	3	/* CPU's FP state is not current's */
111#define TIF_NOHZ		7
112#define TIF_SYSCALL_TRACE	8
113#define TIF_SYSCALL_AUDIT	9
114#define TIF_SYSCALL_TRACEPOINT	10
115#define TIF_SECCOMP		11
116#define TIF_MEMDIE		18	/* is terminating due to OOM killer */
117#define TIF_FREEZE		19
118#define TIF_RESTORE_SIGMASK	20
119#define TIF_SINGLESTEP		21
120#define TIF_32BIT		22	/* 32bit process */
121#define TIF_SWITCH_MM		23	/* deferred switch_mm */
122
123#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
124#define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
125#define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
126#define _TIF_FOREIGN_FPSTATE	(1 << TIF_FOREIGN_FPSTATE)
127#define _TIF_NOHZ		(1 << TIF_NOHZ)
128#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
129#define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
130#define _TIF_SYSCALL_TRACEPOINT	(1 << TIF_SYSCALL_TRACEPOINT)
131#define _TIF_SECCOMP		(1 << TIF_SECCOMP)
132#define _TIF_32BIT		(1 << TIF_32BIT)
133
134#define _TIF_WORK_MASK		(_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
135				 _TIF_NOTIFY_RESUME | _TIF_FOREIGN_FPSTATE)
136
137#define _TIF_SYSCALL_WORK	(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
138				 _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP | \
139				 _TIF_NOHZ)
140
141#endif /* __KERNEL__ */
142#endif /* __ASM_THREAD_INFO_H */
143