LXR linux/arch/arm64/include/asm/thread

   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
  37struct task_struct;
  38
  39#include <asm/types.h>
  40
  41typedef 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 */
  47struct 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 */
  69register unsigned long current_stack_pointer asm ("sp");
  70
  71/*
  72 * how to get the thread information struct from C
  73 */
  74static inline struct thread_info *current_thread_info(void) __attribute_const__;
  75
  76/*
  77 * struct thread_info can be accessed directly via sp_el0.
  78 */
  79static 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