LXR linux/drivers/staging/hv/osd.h

   1/*
   2 *
   3 * Copyright (c) 2009, Microsoft Corporation.
   4 *
   5 * This program is free software; you can redistribute it and/or modify it
   6 * under the terms and conditions of the GNU General Public License,
   7 * version 2, as published by the Free Software Foundation.
   8 *
   9 * This program is distributed in the hope it will be useful, but WITHOUT
  10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12 * more details.
  13 *
  14 * You should have received a copy of the GNU General Public License along with
  15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  16 * Place - Suite 330, Boston, MA 02111-1307 USA.
  17 *
  18 * Authors:
  19 *   Haiyang Zhang <haiyangz@microsoft.com>
  20 *   Hank Janssen  <hjanssen@microsoft.com>
  21 *
  22 */
  23
  24
  25#ifndef _OSD_H_
  26#define _OSD_H_
  27
  28#include <linux/workqueue.h>
  29
  30/* Defines */
  31#define ALIGN_UP(value, align)  (((value) & (align-1)) ?                \
  32                                 (((value) + (align-1)) & ~(align-1)) : \
  33                                 (value))
  34#define ALIGN_DOWN(value, align)        ((value) & ~(align-1))
  35#define NUM_PAGES_SPANNED(addr, len)    ((ALIGN_UP(addr+len, PAGE_SIZE) - \
  36                                         ALIGN_DOWN(addr, PAGE_SIZE)) >>  \
  37                                         PAGE_SHIFT)
  38
  39#define LOWORD(dw)      ((unsigned short)(dw))
  40#define HIWORD(dw)      ((unsigned short)(((unsigned int) (dw) >> 16) & 0xFFFF))
  41
  42struct hv_guid {
  43        unsigned char data[16];
  44};
  45
  46struct osd_waitevent {
  47        int condition;
  48        wait_queue_head_t event;
  49};
  50
  51/* Osd routines */
  52
  53extern void *osd_VirtualAllocExec(unsigned int size);
  54
  55extern void *osd_PageAlloc(unsigned int count);
  56extern void osd_PageFree(void *page, unsigned int count);
  57
  58extern struct osd_waitevent *osd_WaitEventCreate(void);
  59extern void osd_WaitEventSet(struct osd_waitevent *waitEvent);
  60extern int osd_WaitEventWait(struct osd_waitevent *waitEvent);
  61
  62/* If >0, waitEvent got signaled. If ==0, timeout. If < 0, error */
  63extern int osd_WaitEventWaitEx(struct osd_waitevent *waitEvent,
  64                               u32 TimeoutInMs);
  65
  66int osd_schedule_callback(struct workqueue_struct *wq,
  67                          void (*func)(void *),
  68                          void *data);
  69
  70#endif /* _OSD_H_ */
  71