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
  18#define THREAD_SIZE_ORDER       1
  19#define THREAD_SIZE             8192
  20#define THREAD_START_SP         (THREAD_SIZE - 8)
  21
  22#ifndef __ASSEMBLY__
  23
  24struct task_struct;
  25struct exec_domain;
  26
  27#include <asm/types.h>
  28#include <asm/domain.h>
  29
  30typedef unsigned long mm_segment_t;
  31
  32struct cpu_context_save {
  33        __u32   r4;
  34        __u32   r5;
  35        __u32   r6;
  36        __u32   r7;
  37        __u32   r8;
  38        __u32   r9;
  39        __u32   sl;
  40        __u32   fp;
  41        __u32   sp;
  42        __u32   pc;
  43        __u32   extra[2];               /* Xscale 'acc' register, etc */
  44};
  45
  46/*
  47 * low level task data that entry.S needs immediate access to.
  48 * __switch_to() assumes cpu_context follows immediately after cpu_domain.
  49 */
  50struct thread_info {
  51        unsigned long           flags;          /* low level flags */
  52        int                     preempt_count;  /* 0 => preemptable, <0 => bug */
  53        mm_segment_t            addr_limit;     /* address limit */
  54        struct task_struct      *task;          /* main task structure */
  55        struct exec_domain      *exec_domain;   /* execution domain */
  56        __u32                   cpu;            /* cpu */
  57        __u32                   cpu_domain;     /* cpu domain */
  58        struct cpu_context_save cpu_context;    /* cpu context */
  59        __u32                   syscall;        /* syscall number */
  60        __u8                    used_cp[16];    /* thread used copro */
  61        unsigned long           tp_value[2];    /* TLS registers */
  62#ifdef CONFIG_CRUNCH
  63        struct crunch_state     crunchstate;
  64#endif
  65        union fp_state          fpstate __attribute__((aligned(8)));
  66        union vfp_state         vfpstate;
  67#ifdef CONFIG_ARM_THUMBEE
  68        unsigned long           thumbee_state;  /* ThumbEE Handler Base register */
  69#endif
  70        struct restart_block    restart_block;
  71};
  72
  73#define INIT_THREAD_INFO(tsk)                                           \
  74{                                                                       \
  75        .task           = &tsk,                                         \
  76        .exec_domain    = &default_exec_domain,                         \
  77        .flags          = 0,                                            \
  78        .preempt_count  = INIT_PREEMPT_COUNT,                           \
  79        .addr_limit     = KERNEL_DS,                                    \
  80        .cpu_domain     = domain_val(DOMAIN_USER, DOMAIN_MANAGER) |     \
  81                          domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) |   \
  82                          domain_val(DOMAIN_IO, DOMAIN_CLIENT),         \
  83        .restart_block  = {                                             \
  84                .fn     = do_no_restart_syscall,                        \
  85        },                                                              \
  86}
  87
  88#define init_thread_info        (init_thread_union.thread_info)
  89#define init_stack              (init_thread_union.stack)
  90
  91/*
  92 * how to get the thread information struct from C
  93 */
  94static inline struct thread_info *current_thread_info(void) __attribute_const__;
  95
  96static inline struct thread_info *current_thread_info(void)
  97{
  98        register unsigned long sp asm ("sp");
  99        return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
 100}
 101
 102#define thread_saved_pc(tsk)    \
 103        ((unsigned long)(task_thread_info(tsk)->cpu_context.pc))
 104#define thread_saved_sp(tsk)    \
 105        ((unsigned long)(task_thread_info(tsk)->cpu_context.sp))
 106#define thread_saved_fp(tsk)    \
 107        ((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
 108
 109extern void crunch_task_disable(struct thread_info *);
 110extern void crunch_task_copy(struct thread_info *, void *);
 111extern void crunch_task_restore(struct thread_info *, void *);
 112extern void crunch_task_release(struct thread_info *);
 113
 114extern void iwmmxt_task_disable(struct thread_info *);
 115extern void iwmmxt_task_copy(struct thread_info *, void *);
 116extern void iwmmxt_task_restore(struct thread_info *, void *);
 117extern void iwmmxt_task_release(struct thread_info *);
 118extern void iwmmxt_task_switch(struct thread_info *);
 119
 120extern void vfp_sync_hwstate(struct thread_info *);
 121extern void vfp_flush_hwstate(struct thread_info *);
 122
 123struct user_vfp;
 124struct user_vfp_exc;
 125
 126extern int vfp_preserve_user_clear_hwstate(struct user_vfp __user *,
 127                                           struct user_vfp_exc __user *);
 128extern int vfp_restore_user_hwstate(struct user_vfp __user *,
 129                                    struct user_vfp_exc __user *);
 130#endif
 131
 132/*
 133 * We use bit 30 of the preempt_count to indicate that kernel
 134 * preemption is occurring.  See <asm/hardirq.h>.
 135 */
 136#define PREEMPT_ACTIVE  0x40000000
 137
 138/*
 139 * thread information flags:
 140 *  TIF_SYSCALL_TRACE   - syscall trace active
 141 *  TIF_SYSCAL_AUDIT    - syscall auditing active
 142 *  TIF_SIGPENDING      - signal pending
 143 *  TIF_NEED_RESCHED    - rescheduling necessary
 144 *  TIF_NOTIFY_RESUME   - callback before returning to user
 145 *  TIF_USEDFPU         - FPU was used by this task this quantum (SMP)
 146 *  TIF_POLLING_NRFLAG  - true if poll_idle() is polling TIF_NEED_RESCHED
 147 */
 148#define TIF_SIGPENDING          0
 149#define TIF_NEED_RESCHED        1
 150#define TIF_NOTIFY_RESUME       2       /* callback before returning to user */
 151#define TIF_SYSCALL_TRACE       8
 152#define TIF_SYSCALL_AUDIT       9
 153#define TIF_SYSCALL_TRACEPOINT  10
 154#define TIF_SECCOMP             11      /* seccomp syscall filtering active */
 155#define TIF_NOHZ                12      /* in adaptive nohz mode */
 156#define TIF_USING_IWMMXT        17
 157#define TIF_MEMDIE              18      /* is terminating due to OOM killer */
 158#define TIF_RESTORE_SIGMASK     20
 159
 160#define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
 161#define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
 162#define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
 163#define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
 164#define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
 165#define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
 166#define _TIF_SECCOMP            (1 << TIF_SECCOMP)
 167#define _TIF_USING_IWMMXT       (1 << TIF_USING_IWMMXT)
 168
 169/* Checks for any syscall work in entry-common.S */
 170#define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
 171                           _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP)
 172
 173/*
 174 * Change these and you break ASM code in entry-common.S
 175 */
 176#define _TIF_WORK_MASK          (_TIF_NEED_RESCHED | _TIF_SIGPENDING | _TIF_NOTIFY_RESUME)
 177
 178#endif /* __KERNEL__ */
 179#endif /* __ASM_ARM_THREAD_INFO_H */
 180