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
  18 #define THREAD_SIZE_ORDER       1
  19 #define THREAD_SIZE             8192
  20 #define THREAD_START_SP         (THREAD_SIZE - 8)
  21
  22 #ifndef __ASSEMBLY__
  23
  24 struct task_struct;
  25 struct exec_domain;
  26
  27 #include <asm/types.h>
  28 #include <asm/domain.h>
  29
  30 typedef unsigned long mm_segment_t;
  31
  32 struct 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 struct arm_restart_block {
  47         union {
  48                 /* For user cache flushing */
  49                 struct {
  50                         unsigned long start;
  51                         unsigned long end;
  52                 } cache;
  53         };
  54 };
  55
  56 /*
  57  * low level task data that entry.S needs immediate access to.
  58  * __switch_to() assumes cpu_context follows immediately after cpu_domain.
  59  */
  60 struct thread_info {
  61         unsigned long           flags;          /* low level flags */
  62         int                     preempt_count;  /* 0 => preemptable, <0 => bug */
  63         mm_segment_t            addr_limit;     /* address limit */
  64         struct task_struct      *task;          /* main task structure */
  65         struct exec_domain      *exec_domain;   /* execution domain */
  66         __u32                   cpu;            /* cpu */
  67         __u32                   cpu_domain;     /* cpu domain */
  68         struct cpu_context_save cpu_context;    /* cpu context */
  69         __u32                   syscall;        /* syscall number */
  70         __u8                    used_cp[16];    /* thread used copro */
  71         unsigned long           tp_value[2];    /* TLS registers */
  72 #ifdef CONFIG_CRUNCH
  73         struct crunch_state     crunchstate;
  74 #endif
  75         union fp_state          fpstate __attribute__((aligned(8)));
  76         union vfp_state         vfpstate;
  77 #ifdef CONFIG_ARM_THUMBEE
  78         unsigned long           thumbee_state;  /* ThumbEE Handler Base register */
  79 #endif
  80         struct restart_block    restart_block;
  81         struct arm_restart_block        arm_restart_block;
  82 };
  83
  84 #define INIT_THREAD_INFO(tsk)                                           \
  85 {                                                                       \
  86         .task           = &tsk,                                         \
  87         .exec_domain    = &default_exec_domain,                         \
  88         .flags          = 0,                                            \
  89         .preempt_count  = INIT_PREEMPT_COUNT,                           \
  90         .addr_limit     = KERNEL_DS,                                    \
  91         .cpu_domain     = domain_val(DOMAIN_USER, DOMAIN_MANAGER) |     \
  92                           domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) |   \
  93                           domain_val(DOMAIN_IO, DOMAIN_CLIENT),         \
  94         .restart_block  = {                                             \
  95                 .fn     = do_no_restart_syscall,                        \
  96         },                                                              \
  97 }
  98
  99 #define init_thread_info        (init_thread_union.thread_info)
 100 #define init_stack              (init_thread_union.stack)
 101
 102 /*
 103  * how to get the thread information struct from C
 104  */
 105 static inline struct thread_info *current_thread_info(void) __attribute_const__;
 106
 107 static inline struct thread_info *current_thread_info(void)
 108 {
 109         register unsigned long sp asm ("sp");
 110         return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
 111 }
 112
 113 #define thread_saved_pc(tsk)    \
 114         ((unsigned long)(task_thread_info(tsk)->cpu_context.pc))
 115 #define thread_saved_sp(tsk)    \
 116         ((unsigned long)(task_thread_info(tsk)->cpu_context.sp))
 117 #define thread_saved_fp(tsk)    \
 118         ((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
 119
 120 extern void crunch_task_disable(struct thread_info *);
 121 extern void crunch_task_copy(struct thread_info *, void *);
 122 extern void crunch_task_restore(struct thread_info *, void *);
 123 extern void crunch_task_release(struct thread_info *);
 124
 125 extern void iwmmxt_task_disable(struct thread_info *);
 126 extern void iwmmxt_task_copy(struct thread_info *, void *);
 127 extern void iwmmxt_task_restore(struct thread_info *, void *);
 128 extern void iwmmxt_task_release(struct thread_info *);
 129 extern void iwmmxt_task_switch(struct thread_info *);
 130
 131 extern void vfp_sync_hwstate(struct thread_info *);
 132 extern void vfp_flush_hwstate(struct thread_info *);
 133
 134 struct user_vfp;
 135 struct user_vfp_exc;
 136
 137 extern int vfp_preserve_user_clear_hwstate(struct user_vfp __user *,
 138                                            struct user_vfp_exc __user *);
 139 extern int vfp_restore_user_hwstate(struct user_vfp __user *,
 140                                     struct user_vfp_exc __user *);
 141 #endif
 142
 143 /*
 144  * thread information flags:
 145  *  TIF_SYSCALL_TRACE   - syscall trace active
 146  *  TIF_SYSCAL_AUDIT    - syscall auditing active
 147  *  TIF_SIGPENDING      - signal pending
 148  *  TIF_NEED_RESCHED    - rescheduling necessary
 149  *  TIF_NOTIFY_RESUME   - callback before returning to user
 150  *  TIF_USEDFPU         - FPU was used by this task this quantum (SMP)
 151  *  TIF_POLLING_NRFLAG  - true if poll_idle() is polling TIF_NEED_RESCHED
 152  */
 153 #define TIF_SIGPENDING          0
 154 #define TIF_NEED_RESCHED        1
 155 #define TIF_NOTIFY_RESUME       2       /* callback before returning to user */
 156 #define TIF_SYSCALL_TRACE       8
 157 #define TIF_SYSCALL_AUDIT       9
 158 #define TIF_SYSCALL_TRACEPOINT  10
 159 #define TIF_SECCOMP             11      /* seccomp syscall filtering active */
 160 #define TIF_NOHZ                12      /* in adaptive nohz mode */
 161 #define TIF_USING_IWMMXT        17
 162 #define TIF_MEMDIE              18      /* is terminating due to OOM killer */
 163 #define TIF_RESTORE_SIGMASK     20
 164
 165 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
 166 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
 167 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
 168 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
 169 #define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
 170 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
 171 #define _TIF_SECCOMP            (1 << TIF_SECCOMP)
 172 #define _TIF_USING_IWMMXT       (1 << TIF_USING_IWMMXT)
 173
 174 /* Checks for any syscall work in entry-common.S */
 175 #define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
 176                            _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP)
 177
 178 /*
 179  * Change these and you break ASM code in entry-common.S
 180  */
 181 #define _TIF_WORK_MASK          (_TIF_NEED_RESCHED | _TIF_SIGPENDING | _TIF_NOTIFY_RESUME)
 182
 183 #endif /* __KERNEL__ */
 184 #endif /* __ASM_ARM_THREAD_INFO_H */