LXR linux/arch/blackfin/include/asm/thread

   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
  31typedef 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
  38struct 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#define init_thread_info        (init_thread_union.thread_info)
  60#define init_stack              (init_thread_union.stack)
  61
  62/* Given a task stack pointer, you can find its corresponding
  63 * thread_info structure just by masking it to the THREAD_SIZE
  64 * boundary (currently 8K as you can see above).
  65 */
  66__attribute_const__
  67static inline struct thread_info *current_thread_info(void)
  68{
  69        struct thread_info *ti;
  70        __asm__("%0 = sp;" : "=da"(ti));
  71        return (struct thread_info *)((long)ti & ~((long)THREAD_SIZE-1));
  72}
  73
  74#endif                          /* __ASSEMBLY__ */
  75
  76/*
  77 * thread information flag bit numbers
  78 */
  79#define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  80#define TIF_SIGPENDING          1       /* signal pending */
  81#define TIF_NEED_RESCHED        2       /* rescheduling necessary */
  82#define TIF_MEMDIE              4       /* is terminating due to OOM killer */
  83#define TIF_RESTORE_SIGMASK     5       /* restore signal mask in do_signal() */
  84#define TIF_IRQ_SYNC            7       /* sync pipeline stage */
  85#define TIF_NOTIFY_RESUME       8       /* callback before returning to user */
  86#define TIF_SINGLESTEP          9
  87
  88/* as above, but as bit values */
  89#define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
  90#define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
  91#define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
  92#define _TIF_IRQ_SYNC           (1<<TIF_IRQ_SYNC)
  93#define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
  94#define _TIF_SINGLESTEP         (1<<TIF_SINGLESTEP)
  95
  96#define _TIF_WORK_MASK          0x0000FFFE      /* work to do on interrupt/exception return */
  97
  98#endif                          /* __KERNEL__ */
  99
 100#endif                          /* _ASM_THREAD_INFO_H */
 101