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
  42 struct hv_guid {
  43         unsigned char data[16];
  44 };
  45
  46 struct osd_waitevent {
  47         int condition;
  48         wait_queue_head_t event;
  49 };
  50
  51 /* Osd routines */
  52
  53 extern void *osd_VirtualAllocExec(unsigned int size);
  54
  55 extern void *osd_PageAlloc(unsigned int count);
  56 extern void osd_PageFree(void *page, unsigned int count);
  57
  58 extern struct osd_waitevent *osd_WaitEventCreate(void);
  59 extern void osd_WaitEventSet(struct osd_waitevent *waitEvent);
  60 extern int osd_WaitEventWait(struct osd_waitevent *waitEvent);
  61
  62 /* If >0, waitEvent got signaled. If ==0, timeout. If < 0, error */
  63 extern int osd_WaitEventWaitEx(struct osd_waitevent *waitEvent,
  64                                u32 TimeoutInMs);
  65
  66 int osd_schedule_callback(struct workqueue_struct *wq,
  67                           void (*func)(void *),
  68                           void *data);
  69
  70 #endif /* _OSD_H_ */