2 * Based on arch/arm/include/asm/thread_info.h
4 * Copyright (C) 2002 Russell King.
5 * Copyright (C) 2012 ARM Ltd.
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.
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.
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/>.
19 #ifndef __ASM_THREAD_INFO_H
20 #define __ASM_THREAD_INFO_H
24 #include <linux/compiler.h>
26 #ifdef CONFIG_ARM64_4K_PAGES
27 #define THREAD_SIZE_ORDER 2
28 #elif defined(CONFIG_ARM64_16K_PAGES)
29 #define THREAD_SIZE_ORDER 0
32 #define THREAD_SIZE 16384
33 #define THREAD_START_SP (THREAD_SIZE - 16)
39 #include <asm/types.h>
41 typedef unsigned long mm_segment_t;
44 * low level task data that entry.S needs immediate access to.
45 * __switch_to() assumes cpu_context follows immediately after cpu_domain.
48 unsigned long flags; /* low level flags */
49 mm_segment_t addr_limit; /* address limit */
50 struct task_struct *task; /* main task structure */
51 int preempt_count; /* 0 => preemptable, <0 => bug */
52 int preempt_lazy_count; /* 0 => preemptable, <0 => bug */
56 #define INIT_THREAD_INFO(tsk) \
60 .preempt_count = INIT_PREEMPT_COUNT, \
61 .addr_limit = KERNEL_DS, \
64 #define init_thread_info (init_thread_union.thread_info)
65 #define init_stack (init_thread_union.stack)
68 * how to get the current stack pointer from C
70 register unsigned long current_stack_pointer asm ("sp");
73 * how to get the thread information struct from C
75 static inline struct thread_info *current_thread_info(void) __attribute_const__;
77 static inline struct thread_info *current_thread_info(void)
79 return (struct thread_info *)
80 (current_stack_pointer & ~(THREAD_SIZE - 1));
83 #define thread_saved_pc(tsk) \
84 ((unsigned long)(tsk->thread.cpu_context.pc))
85 #define thread_saved_sp(tsk) \
86 ((unsigned long)(tsk->thread.cpu_context.sp))
87 #define thread_saved_fp(tsk) \
88 ((unsigned long)(tsk->thread.cpu_context.fp))
93 * thread information flags:
94 * TIF_SYSCALL_TRACE - syscall trace active
95 * TIF_SYSCALL_TRACEPOINT - syscall tracepoint for ftrace
96 * TIF_SYSCALL_AUDIT - syscall auditing
97 * TIF_SECOMP - syscall secure computing
98 * TIF_SIGPENDING - signal pending
99 * TIF_NEED_RESCHED - rescheduling necessary
100 * TIF_NOTIFY_RESUME - callback before returning to user
101 * TIF_USEDFPU - FPU was used by this task this quantum (SMP)
103 #define TIF_SIGPENDING 0
104 #define TIF_NEED_RESCHED 1
105 #define TIF_NOTIFY_RESUME 2 /* callback before returning to user */
106 #define TIF_FOREIGN_FPSTATE 3 /* CPU's FP state is not current's */
107 #define TIF_NEED_RESCHED_LAZY 4
109 #define TIF_SYSCALL_TRACE 8
110 #define TIF_SYSCALL_AUDIT 9
111 #define TIF_SYSCALL_TRACEPOINT 10
112 #define TIF_SECCOMP 11
113 #define TIF_MEMDIE 18 /* is terminating due to OOM killer */
114 #define TIF_FREEZE 19
115 #define TIF_RESTORE_SIGMASK 20
116 #define TIF_SINGLESTEP 21
117 #define TIF_32BIT 22 /* 32bit process */
119 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
120 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
121 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
122 #define _TIF_FOREIGN_FPSTATE (1 << TIF_FOREIGN_FPSTATE)
123 #define _TIF_NEED_RESCHED_LAZY (1 << TIF_NEED_RESCHED_LAZY)
124 #define _TIF_NOHZ (1 << TIF_NOHZ)
125 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
126 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
127 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
128 #define _TIF_SECCOMP (1 << TIF_SECCOMP)
129 #define _TIF_32BIT (1 << TIF_32BIT)
131 #define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
132 _TIF_NOTIFY_RESUME | _TIF_FOREIGN_FPSTATE | \
133 _TIF_NEED_RESCHED_LAZY)
135 #define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
136 _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP | \
139 #endif /* __KERNEL__ */
140 #endif /* __ASM_THREAD_INFO_H */