Changeset 1802 in vbox

Timestamp:

Mar 29, 2007 2:04:07 PM (18 years ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

19982

Message:

Avoid unimplemented int15 function warning for ah=0xe9 (SMI functions
such as SpeedStep).

File:

• trunk/src/VBox/Devices/PC/BIOS/rombios.c (modified) (2 diffs)

trunk/src/VBox/Devices/PC/BIOS/rombios.c

@@ -3749 +3749 @@
         goto undecoded;
       /* GRUB calls int15 with ax=0x00c0 to get the ROM configuration table,
-       * which we don't support, but logging that event is annoying. */
+       * which we don't support, but logging that event is annoying. In fact
+       * it is likely that they just misread some specs, because there is a
+       * int15 BIOS function AH=0xc0 which sounds quite similar to what GRUB
+       * wants to achieve. */
       SET_CF();
       regs.u.r8.ah = UNSUPPORTED_FUNCTION;
@@ -4039 +4042 @@
 
 #ifdef VBOX
+    /* Make the BIOS warning for pretty much every Linux kernel start
+     * disappear - it calls with ax=0xe980 to figure out SMI info. */
+    case 0xe9: /* SMI functions (SpeedStep and similar things) */
+      SET_CF();
+      regs.u.r8.ah = UNSUPPORTED_FUNCTION;
+      break;
 undecoded:
 #endif /* VBOX */