arch/arm64/include/asm/thread_info.h

   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  * We don't use read_sysreg() as we want the compiler to cache the value where
  80  * possible.
  81  */
  82 static inline struct thread_info *current_thread_info(void)
  83 {
  84         unsigned long sp_el0;
  85
  86         asm ("mrs %0, sp_el0" : "=r" (sp_el0));
  87
  88         return (struct thread_info *)sp_el0;
  89 }
  90
  91 #define thread_saved_pc(tsk)    \
  92         ((unsigned long)(tsk->thread.cpu_context.pc))
  93 #define thread_saved_sp(tsk)    \
  94         ((unsigned long)(tsk->thread.cpu_context.sp))
  95 #define thread_saved_fp(tsk)    \
  96         ((unsigned long)(tsk->thread.cpu_context.fp))
  97
  98 #endif
  99
 100 /*
 101  * thread information flags:
 102  *  TIF_SYSCALL_TRACE   - syscall trace active
 103  *  TIF_SYSCALL_TRACEPOINT - syscall tracepoint for ftrace
 104  *  TIF_SYSCALL_AUDIT   - syscall auditing
 105  *  TIF_SECOMP          - syscall secure computing
 106  *  TIF_SIGPENDING      - signal pending
 107  *  TIF_NEED_RESCHED    - rescheduling necessary
 108  *  TIF_NOTIFY_RESUME   - callback before returning to user
 109  *  TIF_USEDFPU         - FPU was used by this task this quantum (SMP)
 110  */
 111 #define TIF_SIGPENDING          0
 112 #define TIF_NEED_RESCHED        1
 113 #define TIF_NOTIFY_RESUME       2       /* callback before returning to user */
 114 #define TIF_FOREIGN_FPSTATE     3       /* CPU's FP state is not current's */
 115 #define TIF_NOHZ                7
 116 #define TIF_SYSCALL_TRACE       8
 117 #define TIF_SYSCALL_AUDIT       9
 118 #define TIF_SYSCALL_TRACEPOINT  10
 119 #define TIF_SECCOMP             11
 120 #define TIF_MEMDIE              18      /* is terminating due to OOM killer */
 121 #define TIF_FREEZE              19
 122 #define TIF_RESTORE_SIGMASK     20
 123 #define TIF_SINGLESTEP          21
 124 #define TIF_32BIT               22      /* 32bit process */
 125 #define TIF_SSBD                23      /* Wants SSB mitigation */
 126
 127 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
 128 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
 129 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
 130 #define _TIF_FOREIGN_FPSTATE    (1 << TIF_FOREIGN_FPSTATE)
 131 #define _TIF_NOHZ               (1 << TIF_NOHZ)
 132 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
 133 #define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
 134 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
 135 #define _TIF_SECCOMP            (1 << TIF_SECCOMP)
 136 #define _TIF_32BIT              (1 << TIF_32BIT)
 137
 138 #define _TIF_WORK_MASK          (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
 139                                  _TIF_NOTIFY_RESUME | _TIF_FOREIGN_FPSTATE)
 140
 141 #define _TIF_SYSCALL_WORK       (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
 142                                  _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP | \
 143                                  _TIF_NOHZ)
 144
 145 #endif /* __KERNEL__ */
 146 #endif /* __ASM_THREAD_INFO_H */