krnl386.exe: Start DOSVM timer on GET_SYSTEM_TIME.

Start the DOSVM tick timer when the GET_SYSTEM_TIME interrupt (int 1a ah 00) is fired. This fixes a bug when running Sid Meier's CIVILIZATION for Windows 3.1 where the game would appear to hang at the launch screen (although sound would play as expected). This was due to the BIOSDATA.Ticks field never being updated. Signed-off-by: Liam Middlebrook <liammiddlebrook@gmail.com>

krnl386.exe: Start DOSVM timer on GET_SYSTEM_TIME.
4d58ee6a · Liam Middlebrook · Alexandre Julliard · aaad7959 · 4d58ee6a
Commit 4d58ee6a authored Apr 13, 2024 by Liam Middlebrook Committed by Alexandre Julliard Apr 15, 2024
Hide whitespace changes
Inline Side-by-side

Showing with 2 additions and 0 deletions

interrupts.c dlls/krnl386.exe16/interrupts.c +2 -0

No files found.
--- a/dlls/krnl386.exe16/interrupts.c
+++ b/dlls/krnl386.exe16/interrupts.c
@@ -549,6 +549,8 @@ static void WINAPI DOSVM_Int1aHandler( CONTEXT *context )
    case 0x00: /* GET SYSTEM TIME */
        {
            BIOSDATA *data = DOSVM_BiosData();
+
+            DOSVM_start_bios_timer();
            SET_CX( context, HIWORD(data->Ticks) );
            SET_DX( context, LOWORD(data->Ticks) );
            SET_AL( context, 0 ); /* FIXME: midnight flag is unsupported */