1 files changed, 54 insertions, 0 deletions
diff --git a/sftsr.h b/sftsr.h
new file mode 100644
index 0000000..bdd819e
--- /dev/null
+++ b/sftsr.h
@@ -0,0 +1,54 @@
+#ifndef SFTSR_H
+#define SFTSR_H
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#include "vbox.h"
+#include "int21dos.h"
+
+#define VERSION_MAJOR 0
+#define VERSION_MINOR 1
+
+#define LASTDRIVE     'Z'
+#define MAX_NUM_DRIVE (LASTDRIVE - 'A')
+#define NUM_DRIVES    (MAX_NUM_DRIVE + 1)
+
+typedef struct tsrdata {
+	// TSR installation data
+	/** Previous int2f ISR, storing it for uninstall. */
+	void (__interrupt __far *prev_int2f_handler)();
+
+	/** Array of all possible DOS drives. */
+	struct {
+		/** VirtualBox "root" for this drive, or NIL if unmounted. */
+		uint32_t root;
+	} drives[NUM_DRIVES];
+
+	/** Stored pointer for the DOS SDA. */
+	DOSSDA __far *dossda;
+
+	/** Handle for the directory we are currently searching in. */
+	uint64_t search_dir_handle;
+
+	struct vboxcomm vb;
+	uint32_t hgcm_client_id;
+} TSRDATA;
+
+typedef TSRDATA * PTSRDATA;
+typedef TSRDATA __far * LPTSRDATA;
+
+extern void __declspec(naked) __far int2f_isr(void);
+
+extern LPTSRDATA __far get_tsr_data(bool installed);
+
+/** This symbol is always at the end of the TSR segment */
+extern int resident_end;
+
+/** This is not just data, but the entire segment. */
+static inline unsigned get_resident_size(void)
+{
+	return FP_OFF(&resident_end);
+}
+
+#endif // SFTSR_H