Changeset 83013 in vbox for trunk/src/VBox/ValidationKit/bootsectors/bs3kit

Timestamp:

Feb 7, 2020 2:13:38 AM (5 years ago)

Author:

vboxsync

Message:

bs3kit: Fixed silly non-max CS16 limit crap causing trouble when returning to real-mode.

Location:

trunk/src/VBox/ValidationKit/bootsectors/bs3kit

Files:

• bs3-mode-SwitchToRM.asm (modified) (1 diff)
• bs3-rm-InitGdt.c (modified) (1 diff)

trunk/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-mode-SwitchToRM.asm

@@ -253 +253 @@
         ; real mode) are real mode compatible.
         ;
+        ; ASSUMES BS3_SEL_R0_SS16 and BS3_SEL_R0_CS16 are both maxed out and
+        ; has no funny bits set!
+        ;
 .is_386_or_better:
 ;; @todo Testcase: Experiment leaving weird stuff in the hidden segment registers.

trunk/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-rm-InitGdt.c

@@ -41 +41 @@
 BS3_DECL_FAR(void) Bs3InitGdt_rm_far(void)
 {
-#if 1
+#if 0 /* This totaly messes us up when going back to raw-mode for BIOS work. */
     Bs3Gdte_R0_CS16.Gen.u16LimitLow     = Bs3Text16_Size - 1;
     Bs3Gdte_R1_CS16.Gen.u16LimitLow     = Bs3Text16_Size - 1;