arch/blackfin/include/asm/thread_info.h

   1 /*
   2  * Copyright 2004-2010 Analog Devices Inc.
   3  *
   4  * Licensed under the GPL-2 or later.
   5  */
   6
   7 #ifndef _ASM_THREAD_INFO_H
   8 #define _ASM_THREAD_INFO_H
   9
  10 #include <asm/page.h>
  11 #include <asm/entry.h>
  12 #include <asm/l1layout.h>
  13 #include <linux/compiler.h>
  14
  15 #ifdef __KERNEL__
  16
  17 /* Thread Align Mask to reach to the top of the stack
  18  * for any process
  19  */
  20 #define ALIGN_PAGE_MASK         0xffffe000
  21
  22 /*
  23  * Size of kernel stack for each process. This must be a power of 2...
  24  */
  25 #define THREAD_SIZE_ORDER       1
  26 #define THREAD_SIZE             8192    /* 2 pages */
  27 #define STACK_WARN              (THREAD_SIZE/8)
  28
  29 #ifndef __ASSEMBLY__
  30
  31 typedef unsigned long mm_segment_t;
  32
  33 /*
  34  * low level task data.
  35  * If you change this, change the TI_* offsets below to match.
  36  */
  37
  38 struct thread_info {
  39         struct task_struct *task;       /* main task structure */
  40         unsigned long flags;    /* low level flags */
  41         int cpu;                /* cpu we're on */
  42         int preempt_count;      /* 0 => preemptable, <0 => BUG */
  43         mm_segment_t addr_limit;        /* address limit */
  44 #ifndef CONFIG_SMP
  45         struct l1_scratch_task_info l1_task_info;
  46 #endif
  47 };
  48
  49 /*
  50  * macros/functions for gaining access to the thread information structure
  51  */
  52 #define INIT_THREAD_INFO(tsk)                   \
  53 {                                               \
  54         .task           = &tsk,                 \
  55         .flags          = 0,                    \
  56         .cpu            = 0,                    \
  57         .preempt_count  = INIT_PREEMPT_COUNT,   \
  58 }
  59
  60 /* Given a task stack pointer, you can find its corresponding
  61  * thread_info structure just by masking it to the THREAD_SIZE
  62  * boundary (currently 8K as you can see above).
  63  */
  64 __attribute_const__
  65 static inline struct thread_info *current_thread_info(void)
  66 {
  67         struct thread_info *ti;
  68         __asm__("%0 = sp;" : "=da"(ti));
  69         return (struct thread_info *)((long)ti & ~((long)THREAD_SIZE-1));
  70 }
  71
  72 #endif                          /* __ASSEMBLY__ */
  73
  74 /*
  75  * thread information flag bit numbers
  76  */
  77 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  78 #define TIF_SIGPENDING          1       /* signal pending */
  79 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
  80 #define TIF_MEMDIE              4       /* is terminating due to OOM killer */
  81 #define TIF_RESTORE_SIGMASK     5       /* restore signal mask in do_signal() */
  82 #define TIF_IRQ_SYNC            7       /* sync pipeline stage */
  83 #define TIF_NOTIFY_RESUME       8       /* callback before returning to user */
  84 #define TIF_SINGLESTEP          9
  85
  86 /* as above, but as bit values */
  87 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
  88 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
  89 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
  90 #define _TIF_IRQ_SYNC           (1<<TIF_IRQ_SYNC)
  91 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
  92 #define _TIF_SINGLESTEP         (1<<TIF_SINGLESTEP)
  93
  94 #define _TIF_WORK_MASK          0x0000FFFE      /* work to do on interrupt/exception return */
  95
  96 #endif                          /* __KERNEL__ */
  97
  98 #endif                          /* _ASM_THREAD_INFO_H */