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Linux/arch/arm64/include/asm/thread_info.h

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  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 #ifdef CONFIG_ARM64_4K_PAGES
 27 #define THREAD_SIZE_ORDER       2
 28 #elif defined(CONFIG_ARM64_16K_PAGES)
 29 #define THREAD_SIZE_ORDER       0
 30 #endif
 31 
 32 #define THREAD_SIZE             16384
 33 #define THREAD_START_SP         (THREAD_SIZE - 16)
 34 
 35 #ifndef __ASSEMBLY__
 36 
 37 struct task_struct;
 38 
 39 #include <asm/types.h>
 40 
 41 typedef unsigned long mm_segment_t;
 42 
 43 /*
 44  * low level task data that entry.S needs immediate access to.
 45  * __switch_to() assumes cpu_context follows immediately after cpu_domain.
 46  */
 47 struct thread_info {
 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                     cpu;            /* cpu */
 53 };
 54 
 55 #define INIT_THREAD_INFO(tsk)                                           \
 56 {                                                                       \
 57         .task           = &tsk,                                         \
 58         .flags          = 0,                                            \
 59         .preempt_count  = INIT_PREEMPT_COUNT,                           \
 60         .addr_limit     = KERNEL_DS,                                    \
 61 }
 62 
 63 #define init_thread_info        (init_thread_union.thread_info)
 64 #define init_stack              (init_thread_union.stack)
 65 
 66 /*
 67  * how to get the current stack pointer from C
 68  */
 69 register unsigned long current_stack_pointer asm ("sp");
 70 
 71 /*
 72  * how to get the thread information struct from C
 73  */
 74 static inline struct thread_info *current_thread_info(void) __attribute_const__;
 75 
 76 /*
 77  * struct thread_info can be accessed directly via sp_el0.
 78  */
 79 static inline struct thread_info *current_thread_info(void)
 80 {
 81         unsigned long sp_el0;
 82 
 83         asm ("mrs %0, sp_el0" : "=r" (sp_el0));
 84 
 85         return (struct thread_info *)sp_el0;
 86 }
 87 
 88 #define thread_saved_pc(tsk)    \
 89         ((unsigned long)(tsk->thread.cpu_context.pc))
 90 #define thread_saved_sp(tsk)    \
 91         ((unsigned long)(tsk->thread.cpu_context.sp))
 92 #define thread_saved_fp(tsk)    \
 93         ((unsigned long)(tsk->thread.cpu_context.fp))
 94 
 95 #endif
 96 
 97 /*
 98  * thread information flags:
 99  *  TIF_SYSCALL_TRACE   - syscall trace active
100  *  TIF_SYSCALL_TRACEPOINT - syscall tracepoint for ftrace
101  *  TIF_SYSCALL_AUDIT   - syscall auditing
102  *  TIF_SECOMP          - syscall secure computing
103  *  TIF_SIGPENDING      - signal pending
104  *  TIF_NEED_RESCHED    - rescheduling necessary
105  *  TIF_NOTIFY_RESUME   - callback before returning to user
106  *  TIF_USEDFPU         - FPU was used by this task this quantum (SMP)
107  */
108 #define TIF_SIGPENDING          0
109 #define TIF_NEED_RESCHED        1
110 #define TIF_NOTIFY_RESUME       2       /* callback before returning to user */
111 #define TIF_FOREIGN_FPSTATE     3       /* CPU's FP state is not current's */
112 #define TIF_NOHZ                7
113 #define TIF_SYSCALL_TRACE       8
114 #define TIF_SYSCALL_AUDIT       9
115 #define TIF_SYSCALL_TRACEPOINT  10
116 #define TIF_SECCOMP             11
117 #define TIF_MEMDIE              18      /* is terminating due to OOM killer */
118 #define TIF_FREEZE              19
119 #define TIF_RESTORE_SIGMASK     20
120 #define TIF_SINGLESTEP          21
121 #define TIF_32BIT               22      /* 32bit process */
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 

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