arch/avr32/include/asm/thread_info.h

   1 /*
   2  * Copyright (C) 2004-2006 Atmel Corporation
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8 #ifndef __ASM_AVR32_THREAD_INFO_H
   9 #define __ASM_AVR32_THREAD_INFO_H
  10
  11 #include <asm/page.h>
  12
  13 #define THREAD_SIZE_ORDER       1
  14 #define THREAD_SIZE             (PAGE_SIZE << THREAD_SIZE_ORDER)
  15
  16 #ifndef __ASSEMBLY__
  17 #include <asm/types.h>
  18
  19 struct task_struct;
  20
  21 struct thread_info {
  22         struct task_struct      *task;          /* main task structure */
  23         unsigned long           flags;          /* low level flags */
  24         __u32                   cpu;
  25         __s32                   preempt_count;  /* 0 => preemptable, <0 => BUG */
  26         __u32                   rar_saved;      /* return address... */
  27         __u32                   rsr_saved;      /* ...and status register
  28                                                    saved by debug handler
  29                                                    when setting up
  30                                                    trampoline */
  31         __u8                    supervisor_stack[0];
  32 };
  33
  34 #define INIT_THREAD_INFO(tsk)                                           \
  35 {                                                                       \
  36         .task           = &tsk,                                         \
  37         .flags          = 0,                                            \
  38         .cpu            = 0,                                            \
  39         .preempt_count  = INIT_PREEMPT_COUNT,                           \
  40 }
  41
  42 #define init_thread_info        (init_thread_union.thread_info)
  43 #define init_stack              (init_thread_union.stack)
  44
  45 /*
  46  * Get the thread information struct from C.
  47  * We do the usual trick and use the lower end of the stack for this
  48  */
  49 static inline struct thread_info *current_thread_info(void)
  50 {
  51         unsigned long addr = ~(THREAD_SIZE - 1);
  52
  53         asm("and %0, sp" : "=r"(addr) : "0"(addr));
  54         return (struct thread_info *)addr;
  55 }
  56
  57 #define get_thread_info(ti) get_task_struct((ti)->task)
  58 #define put_thread_info(ti) put_task_struct((ti)->task)
  59
  60 #endif /* !__ASSEMBLY__ */
  61
  62 /*
  63  * Thread information flags
  64  * - these are process state flags that various assembly files may need to access
  65  * - pending work-to-be-done flags are in LSW
  66  * - other flags in MSW
  67  */
  68 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  69 #define TIF_SIGPENDING          1       /* signal pending */
  70 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
  71 #define TIF_BREAKPOINT          4       /* enter monitor mode on return */
  72 #define TIF_SINGLE_STEP         5       /* single step in progress */
  73 #define TIF_MEMDIE              6       /* is terminating due to OOM killer */
  74 #define TIF_RESTORE_SIGMASK     7       /* restore signal mask in do_signal */
  75 #define TIF_CPU_GOING_TO_SLEEP  8       /* CPU is entering sleep 0 mode */
  76 #define TIF_NOTIFY_RESUME       9       /* callback before returning to user */
  77 #define TIF_DEBUG               30      /* debugging enabled */
  78 #define TIF_USERSPACE           31      /* true if FS sets userspace */
  79
  80 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
  81 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
  82 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
  83 #define _TIF_BREAKPOINT         (1 << TIF_BREAKPOINT)
  84 #define _TIF_SINGLE_STEP        (1 << TIF_SINGLE_STEP)
  85 #define _TIF_MEMDIE             (1 << TIF_MEMDIE)
  86 #define _TIF_CPU_GOING_TO_SLEEP (1 << TIF_CPU_GOING_TO_SLEEP)
  87 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
  88
  89 /* Note: The masks below must never span more than 16 bits! */
  90
  91 /* work to do on interrupt/exception return */
  92 #define _TIF_WORK_MASK                          \
  93         (_TIF_SIGPENDING                        \
  94          | _TIF_NOTIFY_RESUME                   \
  95          | _TIF_NEED_RESCHED                    \
  96          | _TIF_BREAKPOINT)
  97
  98 /* work to do on any return to userspace */
  99 #define _TIF_ALLWORK_MASK       (_TIF_WORK_MASK | _TIF_SYSCALL_TRACE)
 100 /* work to do on return from debug mode */
 101 #define _TIF_DBGWORK_MASK       (_TIF_WORK_MASK & ~_TIF_BREAKPOINT)
 102
 103 #endif /* __ASM_AVR32_THREAD_INFO_H */