include/asm-arm/thread_info.h

   1 /*
   2  *  linux/include/asm-arm/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 <asm/fpstate.h>
  16
  17 #ifndef __ASSEMBLY__
  18
  19 struct task_struct;
  20 struct exec_domain;
  21
  22 #include <asm/ptrace.h>
  23 #include <asm/types.h>
  24 #include <asm/domain.h>
  25
  26 typedef unsigned long mm_segment_t;
  27
  28 struct cpu_context_save {
  29         __u32   r4;
  30         __u32   r5;
  31         __u32   r6;
  32         __u32   r7;
  33         __u32   r8;
  34         __u32   r9;
  35         __u32   sl;
  36         __u32   fp;
  37         __u32   sp;
  38         __u32   pc;
  39         __u32   extra[2];               /* Xscale 'acc' register, etc */
  40 };
  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  */
  46 struct thread_info {
  47         unsigned long           flags;          /* low level flags */
  48         __s32                   preempt_count;  /* 0 => preemptable, <0 => bug */
  49         mm_segment_t            addr_limit;     /* address limit */
  50         struct task_struct      *task;          /* main task structure */
  51         struct exec_domain      *exec_domain;   /* execution domain */
  52         __u32                   cpu;            /* cpu */
  53         __u32                   cpu_domain;     /* cpu domain */
  54         struct cpu_context_save cpu_context;    /* cpu context */
  55         __u8                    used_cp[16];    /* thread used copro */
  56         unsigned long           tp_value;
  57         union fp_state          fpstate;
  58         union vfp_state         vfpstate;
  59         struct restart_block    restart_block;
  60 };
  61
  62 #define INIT_THREAD_INFO(tsk)                                           \
  63 {                                                                       \
  64         .task           = &tsk,                                         \
  65         .exec_domain    = &default_exec_domain,                         \
  66         .flags          = 0,                                            \
  67         .preempt_count  = 1,                                            \
  68         .addr_limit     = KERNEL_DS,                                    \
  69         .cpu_domain     = domain_val(DOMAIN_USER, DOMAIN_MANAGER) |     \
  70                           domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) |   \
  71                           domain_val(DOMAIN_IO, DOMAIN_CLIENT),         \
  72         .restart_block  = {                                             \
  73                 .fn     = do_no_restart_syscall,                        \
  74         },                                                              \
  75 }
  76
  77 #define init_thread_info        (init_thread_union.thread_info)
  78 #define init_stack              (init_thread_union.stack)
  79
  80 #define THREAD_SIZE             8192
  81
  82 /*
  83  * how to get the thread information struct from C
  84  */
  85 static inline struct thread_info *current_thread_info(void) __attribute_const__;
  86
  87 static inline struct thread_info *current_thread_info(void)
  88 {
  89         register unsigned long sp asm ("sp");
  90         return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
  91 }
  92
  93 extern struct thread_info *alloc_thread_info(struct task_struct *task);
  94 extern void free_thread_info(struct thread_info *);
  95
  96 #define get_thread_info(ti)     get_task_struct((ti)->task)
  97 #define put_thread_info(ti)     put_task_struct((ti)->task)
  98
  99 #define thread_saved_pc(tsk)    \
 100         ((unsigned long)(pc_pointer((tsk)->thread_info->cpu_context.pc)))
 101 #define thread_saved_fp(tsk)    \
 102         ((unsigned long)((tsk)->thread_info->cpu_context.fp))
 103
 104 extern void iwmmxt_task_disable(struct thread_info *);
 105 extern void iwmmxt_task_copy(struct thread_info *, void *);
 106 extern void iwmmxt_task_restore(struct thread_info *, void *);
 107 extern void iwmmxt_task_release(struct thread_info *);
 108
 109 #endif
 110
 111 /*
 112  * We use bit 30 of the preempt_count to indicate that kernel
 113  * preemption is occuring.  See include/asm-arm/hardirq.h.
 114  */
 115 #define PREEMPT_ACTIVE  0x40000000
 116
 117 /*
 118  * thread information flags:
 119  *  TIF_SYSCALL_TRACE   - syscall trace active
 120  *  TIF_NOTIFY_RESUME   - resumption notification requested
 121  *  TIF_SIGPENDING      - signal pending
 122  *  TIF_NEED_RESCHED    - rescheduling necessary
 123  *  TIF_USEDFPU         - FPU was used by this task this quantum (SMP)
 124  *  TIF_POLLING_NRFLAG  - true if poll_idle() is polling TIF_NEED_RESCHED
 125  */
 126 #define TIF_NOTIFY_RESUME       0
 127 #define TIF_SIGPENDING          1
 128 #define TIF_NEED_RESCHED        2
 129 #define TIF_SYSCALL_TRACE       8
 130 #define TIF_POLLING_NRFLAG      16
 131 #define TIF_USING_IWMMXT        17
 132 #define TIF_MEMDIE              18
 133
 134 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
 135 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
 136 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
 137 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
 138 #define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
 139 #define _TIF_USING_IWMMXT       (1 << TIF_USING_IWMMXT)
 140
 141 /*
 142  * Change these and you break ASM code in entry-common.S
 143  */
 144 #define _TIF_WORK_MASK          0x000000ff
 145
 146 #endif /* __KERNEL__ */
 147 #endif /* __ASM_ARM_THREAD_INFO_H */