arch/arm/include/asm/thread_info.h

   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
  25 struct task_struct;
  26 struct exec_domain;
  27
  28 #include <asm/types.h>
  29 #include <asm/domain.h>
  30
  31 typedef unsigned long mm_segment_t;
  32
  33 struct cpu_context_save {
  34         __u32   r4;
  35         __u32   r5;
  36         __u32   r6;
  37         __u32   r7;
  38         __u32   r8;
  39         __u32   r9;
  40         __u32   sl;
  41         __u32   fp;
  42         __u32   sp;
  43         __u32   pc;
  44         __u32   extra[2];               /* Xscale 'acc' register, etc */
  45 };
  46
  47 /*
  48  * low level task data that entry.S needs immediate access to.
  49  * __switch_to() assumes cpu_context follows immediately after cpu_domain.
  50  */
  51 struct thread_info {
  52         unsigned long           flags;          /* low level flags */
  53         int                     preempt_count;  /* 0 => preemptable, <0 => bug */
  54         mm_segment_t            addr_limit;     /* address limit */
  55         struct task_struct      *task;          /* main task structure */
  56         struct exec_domain      *exec_domain;   /* execution domain */
  57         __u32                   cpu;            /* cpu */
  58         __u32                   cpu_domain;     /* cpu domain */
  59         struct cpu_context_save cpu_context;    /* cpu context */
  60         __u32                   syscall;        /* syscall number */
  61         __u8                    used_cp[16];    /* thread used copro */
  62         unsigned long           tp_value[2];    /* TLS registers */
  63 #ifdef CONFIG_CRUNCH
  64         struct crunch_state     crunchstate;
  65 #endif
  66         union fp_state          fpstate __attribute__((aligned(8)));
  67         union vfp_state         vfpstate;
  68 #ifdef CONFIG_ARM_THUMBEE
  69         unsigned long           thumbee_state;  /* ThumbEE Handler Base register */
  70 #endif
  71         struct restart_block    restart_block;
  72 };
  73
  74 #define INIT_THREAD_INFO(tsk)                                           \
  75 {                                                                       \
  76         .task           = &tsk,                                         \
  77         .exec_domain    = &default_exec_domain,                         \
  78         .flags          = 0,                                            \
  79         .preempt_count  = INIT_PREEMPT_COUNT,                           \
  80         .addr_limit     = KERNEL_DS,                                    \
  81         .cpu_domain     = domain_val(DOMAIN_USER, DOMAIN_MANAGER) |     \
  82                           domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) |   \
  83                           domain_val(DOMAIN_IO, DOMAIN_CLIENT),         \
  84         .restart_block  = {                                             \
  85                 .fn     = do_no_restart_syscall,                        \
  86         },                                                              \
  87 }
  88
  89 #define init_thread_info        (init_thread_union.thread_info)
  90 #define init_stack              (init_thread_union.stack)
  91
  92 /*
  93  * how to get the current stack pointer in C
  94  */
  95 register unsigned long current_stack_pointer asm ("sp");
  96
  97 /*
  98  * how to get the thread information struct from C
  99  */
 100 static inline struct thread_info *current_thread_info(void) __attribute_const__;
 101
 102 static inline struct thread_info *current_thread_info(void)
 103 {
 104         return (struct thread_info *)
 105                 (current_stack_pointer & ~(THREAD_SIZE - 1));
 106 }
 107
 108 #define thread_saved_pc(tsk)    \
 109         ((unsigned long)(task_thread_info(tsk)->cpu_context.pc))
 110 #define thread_saved_sp(tsk)    \
 111         ((unsigned long)(task_thread_info(tsk)->cpu_context.sp))
 112
 113 #ifndef CONFIG_THUMB2_KERNEL
 114 #define thread_saved_fp(tsk)    \
 115         ((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
 116 #else
 117 #define thread_saved_fp(tsk)    \
 118         ((unsigned long)(task_thread_info(tsk)->cpu_context.r7))
 119 #endif
 120
 121 extern void crunch_task_disable(struct thread_info *);
 122 extern void crunch_task_copy(struct thread_info *, void *);
 123 extern void crunch_task_restore(struct thread_info *, void *);
 124 extern void crunch_task_release(struct thread_info *);
 125
 126 extern void iwmmxt_task_disable(struct thread_info *);
 127 extern void iwmmxt_task_copy(struct thread_info *, void *);
 128 extern void iwmmxt_task_restore(struct thread_info *, void *);
 129 extern void iwmmxt_task_release(struct thread_info *);
 130 extern void iwmmxt_task_switch(struct thread_info *);
 131
 132 extern void vfp_sync_hwstate(struct thread_info *);
 133 extern void vfp_flush_hwstate(struct thread_info *);
 134
 135 struct user_vfp;
 136 struct user_vfp_exc;
 137
 138 extern int vfp_preserve_user_clear_hwstate(struct user_vfp __user *,
 139                                            struct user_vfp_exc __user *);
 140 extern int vfp_restore_user_hwstate(struct user_vfp __user *,
 141                                     struct user_vfp_exc __user *);
 142 #endif
 143
 144 /*
 145  * thread information flags:
 146  *  TIF_SYSCALL_TRACE   - syscall trace active
 147  *  TIF_SYSCAL_AUDIT    - syscall auditing active
 148  *  TIF_SIGPENDING      - signal pending
 149  *  TIF_NEED_RESCHED    - rescheduling necessary
 150  *  TIF_NOTIFY_RESUME   - callback before returning to user
 151  *  TIF_USEDFPU         - FPU was used by this task this quantum (SMP)
 152  *  TIF_POLLING_NRFLAG  - true if poll_idle() is polling TIF_NEED_RESCHED
 153  */
 154 #define TIF_SIGPENDING          0
 155 #define TIF_NEED_RESCHED        1
 156 #define TIF_NOTIFY_RESUME       2       /* callback before returning to user */
 157 #define TIF_UPROBE              7
 158 #define TIF_SYSCALL_TRACE       8
 159 #define TIF_SYSCALL_AUDIT       9
 160 #define TIF_SYSCALL_TRACEPOINT  10
 161 #define TIF_SECCOMP             11      /* seccomp syscall filtering active */
 162 #define TIF_NOHZ                12      /* in adaptive nohz mode */
 163 #define TIF_USING_IWMMXT        17
 164 #define TIF_MEMDIE              18      /* is terminating due to OOM killer */
 165 #define TIF_RESTORE_SIGMASK     20
 166
 167 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
 168 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
 169 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
 170 #define _TIF_UPROBE             (1 << TIF_UPROBE)
 171 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
 172 #define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
 173 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
 174 #define _TIF_SECCOMP            (1 << TIF_SECCOMP)
 175 #define _TIF_USING_IWMMXT       (1 << TIF_USING_IWMMXT)
 176
 177 /* Checks for any syscall work in entry-common.S */
 178 #define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
 179                            _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP)
 180
 181 /*
 182  * Change these and you break ASM code in entry-common.S
 183  */
 184 #define _TIF_WORK_MASK          (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
 185                                  _TIF_NOTIFY_RESUME | _TIF_UPROBE)
 186
 187 #endif /* __KERNEL__ */
 188 #endif /* __ASM_ARM_THREAD_INFO_H */