At POST time some BIOSes return invalid e820 maps even though
they indicate that the data is valid. We add a check that the first
region returned by e820 is RAM type and declare the map to be invalid
if it is not.
This extends the sanity checks from 8b20e5d ("[pcbios] Sanity-check
the INT15,e820 and INT15,e801 memory maps").
break;
}
+ /* If first region is not RAM, assume map is invalid */
+ if ( ( memmap->count == 0 ) &&
+ ( e820buf.type != E820_TYPE_RAM ) ) {
+ DBG ( "INT 15,e820 failed, first entry not RAM\n" );
+ return -EINVAL;
+ }
+
DBG ( "INT 15,e820 region [%llx,%llx) type %d",
e820buf.start, ( e820buf.start + e820buf.len ),
( int ) e820buf.type );