LXR linux/arch/arm/include/asm/thread

   1/*
   2 *  arch/arm/include/asm/thread_info.h
   3 *
   4 *  Copyright (C) 2002 Russell King.
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License version 2 as
   8 * published by the Free Software Foundation.
   9 */
  10#ifndef __ASM_ARM_THREAD_INFO_H
  11#define __ASM_ARM_THREAD_INFO_H
  12
  13#ifdef __KERNEL__
  14
  15#include <linux/compiler.h>
  16#include <asm/fpstate.h>
  17#include <asm/page.h>
  18
  19#define THREAD_SIZE_ORDER       1
  20#define THREAD_SIZE             (PAGE_SIZE << THREAD_SIZE_ORDER)
  21#define THREAD_START_SP         (THREAD_SIZE - 8)
  22
  23#ifndef __ASSEMBLY__
  24
  25struct task_struct;
  26
  27#include <asm/types.h>
  28
  29typedef unsigned long mm_segment_t;
  30
  31struct cpu_context_save {
  32        __u32   r4;
  33        __u32   r5;
  34        __u32   r6;
  35        __u32   r7;
  36        __u32   r8;
  37        __u32   r9;
  38        __u32   sl;
  39        __u32   fp;
  40        __u32   sp;
  41        __u32   pc;
  42        __u32   extra[2];               /* Xscale 'acc' register, etc */
  43};
  44
  45/*
  46 * low level task data that entry.S needs immediate access to.
  47 * __switch_to() assumes cpu_context follows immediately after cpu_domain.
  48 */
  49struct thread_info {
  50        unsigned long           flags;          /* low level flags */
  51        int                     preempt_count;  /* 0 => preemptable, <0 => bug */
  52        mm_segment_t            addr_limit;     /* address limit */
  53        struct task_struct      *task;          /* main task structure */
  54        __u32                   cpu;            /* cpu */
  55        __u32                   cpu_domain;     /* cpu domain */
  56        struct cpu_context_save cpu_context;    /* cpu context */
  57        __u32                   syscall;        /* syscall number */
  58        __u8                    used_cp[16];    /* thread used copro */
  59        unsigned long           tp_value[2];    /* TLS registers */
  60#ifdef CONFIG_CRUNCH
  61        struct crunch_state     crunchstate;
  62#endif
  63        union fp_state          fpstate __attribute__((aligned(8)));
  64        union vfp_state         vfpstate;
  65#ifdef CONFIG_ARM_THUMBEE
  66        unsigned long           thumbee_state;  /* ThumbEE Handler Base register */
  67#endif
  68};
  69
  70#define INIT_THREAD_INFO(tsk)                                           \
  71{                                                                       \
  72        .task           = &tsk,                                         \
  73        .flags          = 0,                                            \
  74        .preempt_count  = INIT_PREEMPT_COUNT,                           \
  75        .addr_limit     = KERNEL_DS,                                    \
  76}
  77
  78#define init_thread_info        (init_thread_union.thread_info)
  79#define init_stack              (init_thread_union.stack)
  80
  81/*
  82 * how to get the current stack pointer in C
  83 */
  84register unsigned long current_stack_pointer asm ("sp");
  85
  86/*
  87 * how to get the thread information struct from C
  88 */
  89static inline struct thread_info *current_thread_info(void) __attribute_const__;
  90
  91static inline struct thread_info *current_thread_info(void)
  92{
  93        return (struct thread_info *)
  94                (current_stack_pointer & ~(THREAD_SIZE - 1));
  95}
  96
  97#define thread_saved_pc(tsk)    \
  98        ((unsigned long)(task_thread_info(tsk)->cpu_context.pc))
  99#define thread_saved_sp(tsk)    \
 100        ((unsigned long)(task_thread_info(tsk)->cpu_context.sp))
 101
 102#ifndef CONFIG_THUMB2_KERNEL
 103#define thread_saved_fp(tsk)    \
 104        ((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
 105#else
 106#define thread_saved_fp(tsk)    \
 107        ((unsigned long)(task_thread_info(tsk)->cpu_context.r7))
 108#endif
 109
 110extern void crunch_task_disable(struct thread_info *);
 111extern void crunch_task_copy(struct thread_info *, void *);
 112extern void crunch_task_restore(struct thread_info *, void *);
 113extern void crunch_task_release(struct thread_info *);
 114
 115extern void iwmmxt_task_disable(struct thread_info *);
 116extern void iwmmxt_task_copy(struct thread_info *, void *);
 117extern void iwmmxt_task_restore(struct thread_info *, void *);
 118extern void iwmmxt_task_release(struct thread_info *);
 119extern void iwmmxt_task_switch(struct thread_info *);
 120
 121extern void vfp_sync_hwstate(struct thread_info *);
 122extern void vfp_flush_hwstate(struct thread_info *);
 123
 124struct user_vfp;
 125struct user_vfp_exc;
 126
 127extern int vfp_preserve_user_clear_hwstate(struct user_vfp __user *,
 128                                           struct user_vfp_exc __user *);
 129extern int vfp_restore_user_hwstate(struct user_vfp __user *,
 130                                    struct user_vfp_exc __user *);
 131#endif
 132
 133/*
 134 * thread information flags:
 135 *  TIF_USEDFPU         - FPU was used by this task this quantum (SMP)
 136 *  TIF_POLLING_NRFLAG  - true if poll_idle() is polling TIF_NEED_RESCHED
 137 */
 138#define TIF_SIGPENDING          0       /* signal pending */
 139#define TIF_NEED_RESCHED        1       /* rescheduling necessary */
 140#define TIF_NOTIFY_RESUME       2       /* callback before returning to user */
 141#define TIF_UPROBE              3       /* breakpointed or singlestepping */
 142#define TIF_SYSCALL_TRACE       4       /* syscall trace active */
 143#define TIF_SYSCALL_AUDIT       5       /* syscall auditing active */
 144#define TIF_SYSCALL_TRACEPOINT  6       /* syscall tracepoint instrumentation */
 145#define TIF_SECCOMP             7       /* seccomp syscall filtering active */
 146
 147#define TIF_NOHZ                12      /* in adaptive nohz mode */
 148#define TIF_USING_IWMMXT        17
 149#define TIF_MEMDIE              18      /* is terminating due to OOM killer */
 150#define TIF_RESTORE_SIGMASK     20
 151
 152#define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
 153#define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
 154#define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
 155#define _TIF_UPROBE             (1 << TIF_UPROBE)
 156#define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
 157#define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
 158#define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
 159#define _TIF_SECCOMP            (1 << TIF_SECCOMP)
 160#define _TIF_USING_IWMMXT       (1 << TIF_USING_IWMMXT)
 161
 162/* Checks for any syscall work in entry-common.S */
 163#define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
 164                           _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP)
 165
 166/*
 167 * Change these and you break ASM code in entry-common.S
 168 */
 169#define _TIF_WORK_MASK          (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
 170                                 _TIF_NOTIFY_RESUME | _TIF_UPROBE)
 171
 172#endif /* __KERNEL__ */
 173#endif /* __ASM_ARM_THREAD_INFO_H */
 174