include/asm-avr32/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 struct exec_domain;
  21
  22 struct thread_info {
  23         struct task_struct      *task;          /* main task structure */
  24         struct exec_domain      *exec_domain;   /* execution domain */
  25         unsigned long           flags;          /* low level flags */
  26         __u32                   cpu;
  27         __s32                   preempt_count;  /* 0 => preemptable, <0 => BUG */
  28         __u32                   rar_saved;      /* return address... */
  29         __u32                   rsr_saved;      /* ...and status register
  30                                                    saved by debug handler
  31                                                    when setting up
  32                                                    trampoline */
  33         struct restart_block    restart_block;
  34         __u8                    supervisor_stack[0];
  35 };
  36
  37 #define INIT_THREAD_INFO(tsk)                                           \
  38 {                                                                       \
  39         .task           = &tsk,                                         \
  40         .exec_domain    = &default_exec_domain,                         \
  41         .flags          = 0,                                            \
  42         .cpu            = 0,                                            \
  43         .preempt_count  = 1,                                            \
  44         .restart_block  = {                                             \
  45                 .fn     = do_no_restart_syscall                         \
  46         }                                                               \
  47 }
  48
  49 #define init_thread_info        (init_thread_union.thread_info)
  50 #define init_stack              (init_thread_union.stack)
  51
  52 /*
  53  * Get the thread information struct from C.
  54  * We do the usual trick and use the lower end of the stack for this
  55  */
  56 static inline struct thread_info *current_thread_info(void)
  57 {
  58         unsigned long addr = ~(THREAD_SIZE - 1);
  59
  60         asm("and %0, sp" : "=r"(addr) : "0"(addr));
  61         return (struct thread_info *)addr;
  62 }
  63
  64 /* thread information allocation */
  65 #define alloc_thread_info(ti) \
  66         ((struct thread_info *) __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER))
  67 #define free_thread_info(ti) free_pages((unsigned long)(ti), 1)
  68 #define get_thread_info(ti) get_task_struct((ti)->task)
  69 #define put_thread_info(ti) put_task_struct((ti)->task)
  70
  71 #endif /* !__ASSEMBLY__ */
  72
  73 #define PREEMPT_ACTIVE          0x40000000
  74
  75 /*
  76  * Thread information flags
  77  * - these are process state flags that various assembly files may need to access
  78  * - pending work-to-be-done flags are in LSW
  79  * - other flags in MSW
  80  */
  81 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  82 #define TIF_SIGPENDING          1       /* signal pending */
  83 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
  84 #define TIF_POLLING_NRFLAG      3       /* true if poll_idle() is polling
  85                                            TIF_NEED_RESCHED */
  86 #define TIF_BREAKPOINT          4       /* enter monitor mode on return */
  87 #define TIF_SINGLE_STEP         5       /* single step in progress */
  88 #define TIF_MEMDIE              6
  89 #define TIF_RESTORE_SIGMASK     7       /* restore signal mask in do_signal */
  90 #define TIF_CPU_GOING_TO_SLEEP  8       /* CPU is entering sleep 0 mode */
  91 #define TIF_DEBUG               30      /* debugging enabled */
  92 #define TIF_USERSPACE           31      /* true if FS sets userspace */
  93
  94 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
  95 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
  96 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
  97 #define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
  98 #define _TIF_SINGLE_STEP        (1 << TIF_SINGLE_STEP)
  99 #define _TIF_MEMDIE             (1 << TIF_MEMDIE)
 100 #define _TIF_RESTORE_SIGMASK    (1 << TIF_RESTORE_SIGMASK)
 101 #define _TIF_CPU_GOING_TO_SLEEP (1 << TIF_CPU_GOING_TO_SLEEP)
 102
 103 /* Note: The masks below must never span more than 16 bits! */
 104
 105 /* work to do on interrupt/exception return */
 106 #define _TIF_WORK_MASK                          \
 107         ((1 << TIF_SIGPENDING)                  \
 108          | (1 << TIF_NEED_RESCHED)              \
 109          | (1 << TIF_POLLING_NRFLAG)            \
 110          | (1 << TIF_BREAKPOINT)                \
 111          | (1 << TIF_RESTORE_SIGMASK))
 112
 113 /* work to do on any return to userspace */
 114 #define _TIF_ALLWORK_MASK       (_TIF_WORK_MASK | (1 << TIF_SYSCALL_TRACE))
 115 /* work to do on return from debug mode */
 116 #define _TIF_DBGWORK_MASK       (_TIF_WORK_MASK & ~(1 << TIF_BREAKPOINT))
 117
 118 #endif /* __ASM_AVR32_THREAD_INFO_H */