Setting cr0 requires a jmp to synchronize on 386/486

The 386 and 486 requires a jmp after any setting of cr0.  It can be a
near jmp, but those processors do not correctly synchronize without
it.

We have jmps after setting cr0 in all spots except one, so make that
happen correctly.

diff --git a/bcopy32.inc b/bcopy32.inc
index 87190d8..4df5e43 100644 (file)
--- a/bcopy32.inc
+++ b/bcopy32.inc
@@ -532,7 +532,8 @@ trampoline_to_pm:
                mov eax,cr0
                or al,1
                mov cr0,eax             ; Enter protected mode
-               mov ax,PM_DS32          ; 32-bit data segment selector
+               jmp .next               ; Near jump to synchronize on 386/486
+.next:         mov ax,PM_DS32          ; 32-bit data segment selector
                mov es,ax
                mov ds,ax
                mov ss,ax