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         struct restart_block    restart_block;
  29         __u8                    supervisor_stack[0];
  30 };
  31
  32 #define INIT_THREAD_INFO(tsk)                                           \
  33 {                                                                       \
  34         .task           = &tsk,                                         \
  35         .exec_domain    = &default_exec_domain,                         \
  36         .flags          = 0,                                            \
  37         .cpu            = 0,                                            \
  38         .preempt_count  = 1,                                            \
  39         .restart_block  = {                                             \
  40                 .fn     = do_no_restart_syscall                         \
  41         }                                                               \
  42 }
  43
  44 #define init_thread_info        (init_thread_union.thread_info)
  45 #define init_stack              (init_thread_union.stack)
  46
  47 /*
  48  * Get the thread information struct from C.
  49  * We do the usual trick and use the lower end of the stack for this
  50  */
  51 static inline struct thread_info *current_thread_info(void)
  52 {
  53         unsigned long addr = ~(THREAD_SIZE - 1);
  54
  55         asm("and %0, sp" : "=r"(addr) : "0"(addr));
  56         return (struct thread_info *)addr;
  57 }
  58
  59 /* thread information allocation */
  60 #define alloc_thread_info(ti) \
  61         ((struct thread_info *) __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER))
  62 #define free_thread_info(ti) free_pages((unsigned long)(ti), 1)
  63 #define get_thread_info(ti) get_task_struct((ti)->task)
  64 #define put_thread_info(ti) put_task_struct((ti)->task)
  65
  66 #endif /* !__ASSEMBLY__ */
  67
  68 #define PREEMPT_ACTIVE          0x40000000
  69
  70 /*
  71  * Thread information flags
  72  * - these are process state flags that various assembly files may need to access
  73  * - pending work-to-be-done flags are in LSW
  74  * - other flags in MSW
  75  */
  76 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  77 #define TIF_SIGPENDING          1       /* signal pending */
  78 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
  79 #define TIF_POLLING_NRFLAG      3       /* true if poll_idle() is polling
  80                                            TIF_NEED_RESCHED */
  81 #define TIF_BREAKPOINT          4       /* true if we should break after return */
  82 #define TIF_SINGLE_STEP         5       /* single step after next break */
  83 #define TIF_MEMDIE              6
  84 #define TIF_RESTORE_SIGMASK     7       /* restore signal mask in do_signal */
  85 #define TIF_CPU_GOING_TO_SLEEP  8       /* CPU is entering sleep 0 mode */
  86 #define TIF_USERSPACE           31      /* true if FS sets userspace */
  87
  88 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
  89 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
  90 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
  91 #define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
  92 #define _TIF_BREAKPOINT         (1 << TIF_BREAKPOINT)
  93 #define _TIF_SINGLE_STEP        (1 << TIF_SINGLE_STEP)
  94 #define _TIF_MEMDIE             (1 << TIF_MEMDIE)
  95 #define _TIF_RESTORE_SIGMASK    (1 << TIF_RESTORE_SIGMASK)
  96 #define _TIF_CPU_GOING_TO_SLEEP (1 << TIF_CPU_GOING_TO_SLEEP)
  97
  98 /* XXX: These two masks must never span more than 16 bits! */
  99 /* work to do on interrupt/exception return */
 100 #define _TIF_WORK_MASK          0x0000013e
 101 /* work to do on any return to userspace */
 102 #define _TIF_ALLWORK_MASK       0x0000013f
 103 /* work to do on return from debug mode */
 104 #define _TIF_DBGWORK_MASK       0x0000017e
 105
 106 #endif /* __ASM_AVR32_THREAD_INFO_H */