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#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;
  36struct exec_domain;
  37
  38#include <asm/types.h>
  39
  40typedef unsigned long mm_segment_t;
  41
  42/*
  43 * low level task data that entry.S needs immediate access to.
  44 * __switch_to() assumes cpu_context follows immediately after cpu_domain.
  45 */
  46struct thread_info {
  47        unsigned long           flags;          /* low level flags */
  48        mm_segment_t            addr_limit;     /* address limit */
  49        struct task_struct      *task;          /* main task structure */
  50        struct exec_domain      *exec_domain;   /* execution domain */
  51        struct restart_block    restart_block;
  52        int                     preempt_count;  /* 0 => preemptable, <0 => bug */
  53        int                     cpu;            /* cpu */
  54};
  55
  56#define INIT_THREAD_INFO(tsk)                                           \
  57{                                                                       \
  58        .task           = &tsk,                                         \
  59        .exec_domain    = &default_exec_domain,                         \
  60        .flags          = 0,                                            \
  61        .preempt_count  = INIT_PREEMPT_COUNT,                           \
  62        .addr_limit     = KERNEL_DS,                                    \
  63        .restart_block  = {                                             \
  64                .fn     = do_no_restart_syscall,                        \
  65        },                                                              \
  66}
  67
  68#define init_thread_info        (init_thread_union.thread_info)
  69#define init_stack              (init_thread_union.stack)
  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
  76static inline struct thread_info *current_thread_info(void)
  77{
  78        register unsigned long sp asm ("sp");
  79        return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
  80}
  81
  82#define thread_saved_pc(tsk)    \
  83        ((unsigned long)(tsk->thread.cpu_context.pc))
  84#define thread_saved_sp(tsk)    \
  85        ((unsigned long)(tsk->thread.cpu_context.sp))
  86#define thread_saved_fp(tsk)    \
  87        ((unsigned long)(tsk->thread.cpu_context.fp))
  88
  89#endif
  90
  91/*
  92 * We use bit 30 of the preempt_count to indicate that kernel
  93 * preemption is occurring.  See <asm/hardirq.h>.
  94 */
  95#define PREEMPT_ACTIVE  0x40000000
  96
  97/*
  98 * thread information flags:
  99 *  TIF_SYSCALL_TRACE   - syscall trace active
 100 *  TIF_SIGPENDING      - signal pending
 101 *  TIF_NEED_RESCHED    - rescheduling necessary
 102 *  TIF_NOTIFY_RESUME   - callback before returning to user
 103 *  TIF_USEDFPU         - FPU was used by this task this quantum (SMP)
 104 *  TIF_POLLING_NRFLAG  - true if poll_idle() is polling TIF_NEED_RESCHED
 105 */
 106#define TIF_SIGPENDING          0
 107#define TIF_NEED_RESCHED        1
 108#define TIF_NOTIFY_RESUME       2       /* callback before returning to user */
 109#define TIF_SYSCALL_TRACE       8
 110#define TIF_POLLING_NRFLAG      16
 111#define TIF_MEMDIE              18      /* is terminating due to OOM killer */
 112#define TIF_FREEZE              19
 113#define TIF_RESTORE_SIGMASK     20
 114#define TIF_SINGLESTEP          21
 115#define TIF_32BIT               22      /* 32bit process */
 116#define TIF_SWITCH_MM           23      /* deferred switch_mm */
 117
 118#define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
 119#define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
 120#define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
 121#define _TIF_32BIT              (1 << TIF_32BIT)
 122
 123#define _TIF_WORK_MASK          (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
 124                                 _TIF_NOTIFY_RESUME)
 125
 126#endif /* __KERNEL__ */
 127#endif /* __ASM_THREAD_INFO_H */
 128