Initial checkin.rel-0.1.0

1 files changed, 67 insertions, 0 deletions

diff --git a/src/disk.c b/src/disk.c
new file mode 100644
index 0000000..8901b7d
--- /dev/null
+++ b/src/disk.c
@@ -0,0 +1,67 @@
+// 16bit code to access hard drives.
+//
+// Copyright (C) 2008  Kevin O'Connor <kevin@koconnor.net>
+// Copyright (C) 2002  MandrakeSoft S.A.
+//
+// This file may be distributed under the terms of the GNU GPLv3 license.
+
+#include "disk.h" // floppy_13
+#include "biosvar.h" // struct bregs
+#include "util.h" // debug_enter
+
+static void
+disk_13(struct bregs *regs, u8 drive)
+{
+    set_cf(regs, 1);
+}
+
+static void
+handle_legacy_disk(struct bregs *regs, u8 drive)
+{
+    if (drive < 0x80) {
+        floppy_13(regs, drive);
+        return;
+    }
+#if BX_USE_ATADRV
+    if (drive >= 0xE0) {
+        int13_cdrom(regs); // xxx
+        return;
+    }
+#endif
+
+    disk_13(regs, drive);
+}
+
+void VISIBLE
+handle_40(struct bregs *regs)
+{
+    debug_enter(regs);
+    handle_legacy_disk(regs, regs->dl);
+    debug_exit(regs);
+}
+
+// INT 13h Fixed Disk Services Entry Point
+void VISIBLE
+handle_13(struct bregs *regs)
+{
+    debug_enter(regs);
+    u8 drive = regs->dl;
+#if BX_ELTORITO_BOOT
+    if (regs->ah >= 0x4a || regs->ah <= 0x4d) {
+        int13_eltorito(regs);
+    } else if (cdemu_isactive() && cdrom_emulated_drive()) {
+        int13_cdemu(regs);
+    } else
+#endif
+        handle_legacy_disk(regs, drive);
+    debug_exit(regs);
+}
+
+// record completion in BIOS task complete flag
+void VISIBLE
+handle_76(struct bregs *regs)
+{
+    debug_enter(regs);
+    SET_BDA(floppy_harddisk_info, 0xff);
+    eoi_both_pics();
+}