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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
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;
36
37#include <asm/types.h>
38
39typedef unsigned long mm_segment_t;
40
41/*
42 * low level task data that entry.S needs immediate access to.
43 * __switch_to() assumes cpu_context follows immediately after cpu_domain.
44 */
45struct thread_info {
46 unsigned long flags; /* low level flags */
47 mm_segment_t addr_limit; /* address limit */
48 struct task_struct *task; /* main task structure */
49 int preempt_count; /* 0 => preemptable, <0 => bug */
50 int cpu; /* cpu */
51};
52
53#define INIT_THREAD_INFO(tsk) \
54{ \
55 .task = &tsk, \
56 .flags = 0, \
57 .preempt_count = INIT_PREEMPT_COUNT, \
58 .addr_limit = KERNEL_DS, \
59}
60
61#define init_thread_info (init_thread_union.thread_info)
62#define init_stack (init_thread_union.stack)
63
64/*
65 * how to get the current stack pointer from C
66 */
67register unsigned long current_stack_pointer asm ("sp");
68
69/*
70 * how to get the thread information struct from C
71 */
72static inline struct thread_info *current_thread_info(void) __attribute_const__;
73
74static inline struct thread_info *current_thread_info(void)
75{
76 return (struct thread_info *)
77 (current_stack_pointer & ~(THREAD_SIZE - 1));
78}
79
80#define thread_saved_pc(tsk) \
81 ((unsigned long)(tsk->thread.cpu_context.pc))
82#define thread_saved_sp(tsk) \
83 ((unsigned long)(tsk->thread.cpu_context.sp))
84#define thread_saved_fp(tsk) \
85 ((unsigned long)(tsk->thread.cpu_context.fp))
86
87#endif
88
89/*
90 * thread information flags:
91 * TIF_SYSCALL_TRACE - syscall trace active
92 * TIF_SYSCALL_TRACEPOINT - syscall tracepoint for ftrace
93 * TIF_SYSCALL_AUDIT - syscall auditing
94 * TIF_SECOMP - syscall secure computing
95 * TIF_SIGPENDING - signal pending
96 * TIF_NEED_RESCHED - rescheduling necessary
97 * TIF_NOTIFY_RESUME - callback before returning to user
98 * TIF_USEDFPU - FPU was used by this task this quantum (SMP)
99 */
100#define TIF_SIGPENDING 0
101#define TIF_NEED_RESCHED 1
102#define TIF_NOTIFY_RESUME 2 /* callback before returning to user */
103#define TIF_FOREIGN_FPSTATE 3 /* CPU's FP state is not current's */
104#define TIF_NOHZ 7
105#define TIF_SYSCALL_TRACE 8
106#define TIF_SYSCALL_AUDIT 9
107#define TIF_SYSCALL_TRACEPOINT 10
108#define TIF_SECCOMP 11
109#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
110#define TIF_FREEZE 19
111#define TIF_RESTORE_SIGMASK 20
112#define TIF_SINGLESTEP 21
113#define TIF_32BIT 22 /* 32bit process */
114#define TIF_SWITCH_MM 23 /* deferred switch_mm */
115
116#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
117#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
118#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
119#define _TIF_FOREIGN_FPSTATE (1 << TIF_FOREIGN_FPSTATE)
120#define _TIF_NOHZ (1 << TIF_NOHZ)
121#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
122#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
123#define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
124#define _TIF_SECCOMP (1 << TIF_SECCOMP)
125#define _TIF_32BIT (1 << TIF_32BIT)
126
127#define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
128 _TIF_NOTIFY_RESUME | _TIF_FOREIGN_FPSTATE)
129
130#define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
131 _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP | \
132 _TIF_NOHZ)
133
134#endif /* __KERNEL__ */
135#endif /* __ASM_THREAD_INFO_H */