Implemented a int 0x33 handler, with a minimal implementation of the

msdos/int33.c

+/*
+ * DOS interrupt 33h handler
+ */
+
+#include <stdlib.h>
+#include "winuser.h"
+#include "miscemu.h"
+#include "dosexe.h"
+#include "debug.h"
+
+typedef struct {
+  DWORD x, y, but;
+  FARPROC16 callback;
+  WORD callmask;
+} MOUSESYSTEM;
+
+/**********************************************************************
+ *	    INT_Int33Handler
+ *
+ * Handler for int 33h (MS MOUSE).
+ */
+void WINAPI INT_Int33Handler( CONTEXT *context )
+{
+  MOUSESYSTEM *sys = (MOUSESYSTEM *)DOSVM_GetSystemData(0x33);
+
+  switch (AX_reg(context)) {
+  case 0x00:
+    TRACE(int,"Reset mouse driver and request status\n");
+    AX_reg(context) = 0xFFFF; /* installed */
+    BX_reg(context) = 3;      /* # of buttons */
+    sys = calloc(1,sizeof(MOUSESYSTEM));
+    DOSVM_SetSystemData(0x33, sys);
+    break;
+  case 0x03:
+    TRACE(int,"Return mouse position and button status\n");
+    BX_reg(context) = sys->but;
+    CX_reg(context) = sys->x;
+    DX_reg(context) = sys->y;
+    break;
+  case 0x0C: /* Define interrupt subroutine */
+    TRACE(int,"Define mouse interrupt subroutine\n");
+    sys->callmask = CX_reg(context);
+    sys->callback = (FARPROC16)PTR_SEG_OFF_TO_SEGPTR(ES_reg(context), DX_reg(context));
+    break;
+  default:
+    INT_BARF(context,0x33);
+  }
+}
+
+typedef struct {
+  FARPROC16 proc;
+  WORD mask,but,x,y,mx,my;
+} MCALLDATA;
+
+static void MouseRelay(LPDOSTASK lpDosTask,PCONTEXT context,void *mdata)
+{
+  MCALLDATA *data = (MCALLDATA *)mdata;
+  CONTEXT ctx = *context;
+
+  AX_reg(&ctx) = data->mask;
+  BX_reg(&ctx) = data->but;
+  CX_reg(&ctx) = data->x;
+  DX_reg(&ctx) = data->y;
+  SI_reg(&ctx) = data->mx;
+  DI_reg(&ctx) = data->my;
+  CS_reg(&ctx) = SELECTOROF(data->proc);
+  IP_reg(&ctx) = OFFSETOF(data->proc);
+  free(data);
+  DPMI_CallRMProc(&ctx, NULL, 0, 0);
+}
+
+void WINAPI INT_Int33Message(UINT message,WPARAM wParam,LPARAM lParam)
+{
+  MOUSESYSTEM *sys = (MOUSESYSTEM *)DOSVM_GetSystemData(0x33);
+  WORD mask = 0;
+
+  if (!sys) return;
+  sys->x = LOWORD(lParam);
+  sys->y = HIWORD(lParam);
+  switch (message) {
+  case WM_MOUSEMOVE:
+    mask |= 0x01;
+    break;
+  case WM_LBUTTONDOWN:
+  case WM_LBUTTONDBLCLK:
+    sys->but |= 0x01;
+    mask |= 0x02;
+    break;
+  case WM_LBUTTONUP:
+    sys->but &= ~0x01;
+    mask |= 0x04;
+    break;
+  case WM_RBUTTONDOWN:
+  case WM_RBUTTONDBLCLK:
+    sys->but |= 0x02;
+    mask |= 0x08;
+    break;
+  case WM_RBUTTONUP:
+    sys->but &= ~0x02;
+    mask |= 0x10;
+    break;
+  case WM_MBUTTONDOWN:
+  case WM_MBUTTONDBLCLK:
+    sys->but |= 0x04;
+    mask |= 0x20;
+    break;
+  case WM_MBUTTONUP:
+    sys->but &= ~0x04;
+    mask |= 0x40;
+    break;
+  }
+
+  if ((mask & sys->callmask) && sys->callback) {
+    MCALLDATA *data = calloc(1,sizeof(MCALLDATA));
+    data->proc = sys->callback;
+    data->mask = mask & sys->callmask;
+    data->but = sys->but;
+    data->x = sys->x;
+    data->y = sys->y;
+    DOSVM_QueueEvent(-1, DOS_PRIORITY_MOUSE, MouseRelay, data);
+  }
+}