Changeset 79655 in vbox for trunk/src/VBox/Devices/PC/BIOS

Timestamp:

Jul 10, 2019 8:18:56 AM (6 years ago)

Author:

vboxsync

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

131963

Message:

BIOS: ROM init routine may clobber registers, duh (see bugref:6549).

File:

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

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

@@ -70 +70 @@
 }
 
+/* The ROM init routine might trash register. Give the compiler a heads-up. */
+typedef void (rom_init_rtn)(void);
+#pragma aux rom_init_rtn modify [ax bx cx dx si di es] loadds;
+
 /* Scan for ROMs in the given range and execute their POST code. */
 void rom_scan(uint16_t start_seg, uint16_t end_seg)
@@ -84 +88 @@
             DPRINT("Found ROM at segment %04X\n", start_seg);
             if (!rom_checksum((void __far *)rom, rom->num_blks)) {
-                void (__far * rom_init)(void);
+                rom_init_rtn    __far *rom_init;
 
                 /* Checksum good, initialize ROM. */