src/drivers/bus/isa_ids.c

   1 #include <stdint.h>
   2 #include <stdio.h>
   3 #include <byteswap.h>
   4 #include <gpxe/isa_ids.h>
   5
   6 /*
   7  * EISA and ISAPnP IDs are actually mildly human readable, though in a
   8  * somewhat brain-damaged way.
   9  *
  10  */
  11 char * isa_id_string ( unsigned int vendor, unsigned int product ) {
  12         static char buf[7];
  13         int i;
  14
  15         /* Vendor ID is a compressed ASCII string */
  16         vendor = bswap_16 ( vendor );
  17         for ( i = 2 ; i >= 0 ; i-- ) {
  18                 buf[i] = ( 'A' - 1 + ( vendor & 0x1f ) );
  19                 vendor >>= 5;
  20         }
  21
  22         /* Product ID is a 4-digit hex string */
  23         sprintf ( &buf[3], "%04x", bswap_16 ( product ) );
  24
  25         return buf;
  26 }