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hw/dos/int2f.c

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+
+#ifdef TARGET_WINDOWS
+# include <windows.h>
+#endif
+
+#include <stdio.h>
+#include <conio.h> /* this is where Open Watcom hides the outp() etc. functions */
+#include <stdlib.h>
+#include <string.h>
+#include <stddef.h>
+#include <unistd.h>
+#include <malloc.h>
+#include <assert.h>
+#include <fcntl.h>
+#include <dos.h>
+
+#include <hw/cpu/cpu.h>
+#include <hw/dos/dos.h>
+#include <hw/dos/doswin.h>
+#include <hw/dos/dosntvdm.h>
+
+/* support function: call THIS function first before attempting to call INT 2Fh.
+ * Old versions of MS-DOS (especially IBM PC DOS 2.x) may have left INT 2Fh uninitialized to NULL */
+#if !defined(TARGET_WINDOWS) && !defined(WIN386) && !defined(TARGET_OS2)
+int int2f_is_valid(void) {
+#if TARGET_MSDOS == 32
+    return *((uint32_t*)(0xBC)) != 0x00000000;
+#else
+    return *((uint32_t far*)MK_FP(0x00,0xBC)) != 0x00000000;
+#endif
+}
+#endif
+