comboot: issue IRET for INT 2Fh

At least one laptop exists which calls INT 2Fh from inside the BIOS!
So just point INT 2Fh to IRET, and hope that's good enough.

diff --git a/core/comboot.inc b/core/comboot.inc
index 40f8817..659b3bb 100644 (file)
--- a/core/comboot.inc
+++ b/core/comboot.inc
@@ -175,6 +175,10 @@ comboot_setup_api:
                stosd
                mov ax,comboot_int22    ; INT 22h = proprietary syscalls
                stosd
+               ; There exists at least one laptop where the VESA BIOS makes INT 2Fh calls
+               ; back into DOS, for unknown reason...
+               mov ax,comboot_iret     ; INT 2Fh = DOS callbacks
+               mov [di+(2Fh-23h)*4],eax
                ret
 
 ; INT 21h: generic DOS system call
@@ -210,6 +214,7 @@ comboot_resume:
                pop fs
                pop es
                pop ds
+comboot_iret:
                iret
 
 comboot_bad_int21: