palacios/include/palacios/vmm_file.h

   1 /*
   2  * This file is part of the Palacios Virtual Machine Monitor developed
   3  * by the V3VEE Project with funding from the United States National
   4  * Science Foundation and the Department of Energy.
   5  *
   6  * The V3VEE Project is a joint project between Northwestern University
   7  * and the University of New Mexico.  You can find out more at
   8  * http://www.v3vee.org
   9  *
  10  * Copyright (c) 2010, Peter Dinda (pdinda@cs.northwestern.edu>
  11  * Copyright (c) 2010, The V3VEE Project <http://www.v3vee.org>
  12  * All rights reserved.
  13  *
  14  * Author: Peter Dinda <pdinda@cs.northwestern.edu>
  15  *
  16  * This is free software.  You are permitted to use,
  17  * redistribute, and modify it as specified in the file "V3VEE_LICENSE".
  18  */
  19
  20
  21 #ifndef __VMM_FILE_H__
  22 #define __VMM_FILE_H__
  23
  24 #include <palacios/vmm.h>
  25
  26
  27 #ifdef __V3VEE__
  28
  29 #define V3_FileOpen(path, mode)                                         \
  30     ({                                                                  \
  31         extern struct v3_file_hooks * file_hooks;                       \
  32         ((file_hooks) && (file_hooks)->file_open) ?                     \
  33             (file_hooks)->file_open((path), (mode)) : -1;               \
  34     })
  35
  36 #define V3_FileClose(fd)                                                \
  37     ({                                                                  \
  38         extern struct v3_file_hooks * file_hooks;                       \
  39         ((file_hooks) && (file_hooks)->file_close) ?                    \
  40             (file_hooks)->file_close((fd))  :  -1;                      \
  41     })
  42
  43 #define V3_FileSize(fd)                                                 \
  44     ({                                                                  \
  45         extern struct v3_file_hooks * file_hooks;                       \
  46         ((file_hooks) && (file_hooks)->file_size) ?                     \
  47             (file_hooks)->file_size((fd))  : -1;                        \
  48     })
  49
  50 #define V3_FileRead(fd, start, buf, len)                                \
  51     ({                                                                  \
  52         extern struct v3_file_hooks * file_hooks;                       \
  53         ((file_hooks) && (file_hooks)->file_read) ?                     \
  54             (file_hooks)->file_read((fd), (start), (buf), (len)) : -1;  \
  55     })
  56
  57 #define V3_FileWrite(fd,start,buf,len)                                  \
  58     ({                                                                  \
  59         extern struct v3_file_hooks * file_hooks;                       \
  60         ((file_hooks) && (file_hooks)->file_write) ?                    \
  61             (file_hooks)->file_write((fd), (start), (buf), (len)) : -1; \
  62     })
  63
  64
  65 #endif
  66
  67 #define FILE_OPEN_MODE_READ     (1 << 0)
  68 #define FILE_OPEN_MODE_WRITE    (1 << 1)
  69
  70 struct v3_file_hooks {
  71
  72     int (*file_open)(const char * path, int mode);
  73     int (*file_close)(int fd);
  74
  75     long long (*file_size)(int fd);
  76
  77     // blocking reads and writes
  78     long long (*file_read)(int fd,  long long start, void * buffer, long long length);
  79     long long (*file_write)(int fd, long long start, void * buffer, long long length);
  80
  81 };
  82
  83
  84 extern void V3_Init_File(struct v3_file_hooks * hooks);
  85
  86 #endif