path: root/mousmain.c

/*
 * VBMouse - DOS mouse driver exec entry point
 * Copyright (C) 2022 Javier S. Pedro
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dos.h>

#include "kitten.h"
#include "version.h"
#include "dlog.h"
#include "int33.h"
#include "int21dos.h"
#include "int15ps2.h"
#include "serial.h"
#include "sermouse.h"
#include "vbox.h"
#include "vmware.h"
#include "dostsr.h"
#include "mousetsr.h"

static nl_catd cat;

#if USE_WHEEL
static bool detect_ps2_wheel(LPTSRDATA data)
{
	// Do a quick check for a mouse wheel here.
	// The TSR will do its own check when it is reset anyway
	if (ps2m_detect_imps2()) {
		if (ps2m_detect_imex()) {
			data->num_wheels = 2;
			data->num_buttons = 5;
		} else {
			data->num_wheels = 1;
			data->num_buttons = 3;
		}
		return true;
	} else {
		data->num_wheels = 0;
		data->num_buttons = 3;
		return false;
	}
}

static int set_wheel(LPTSRDATA data, bool enable)
{
	printf(_(1, 1, "Setting wheel support to %s\n"), enable ? _(1, 2, "enabled") : _(1, 3, "disabled"));
	data->usewheel = enable;

	if (data->usewheel) {
		if (data->port == 0) {
			if (!detect_ps2_wheel(data)) {
				fprintf(stderr, _(3, 0, "Could not find PS/2 wheel mouse\n"));
			}
		} else {
			// TODO Serial does not support wheels yet
			fprintf(stderr, _(3, 0, "Could not find PS/2 wheel mouse\n"));
		}
	} else {
		// Force num_wheels to 0 even before the next mouse reset
		data->num_wheels = 0;
	}

	return 0;
}

static void set_wheel_keys(LPTSRDATA data, int wheel, uint8_t scancode_up, uint8_t scancode_down)
{
	data->wheel_key[wheel][WHEEL_DIR_UP]   = scancode_up;
	data->wheel_key[wheel][WHEEL_DIR_DOWN] = scancode_down;
}

static int set_wheel_key(LPTSRDATA data, const char *keyname)
{
	if (!data->usewheel) {
		fprintf(stderr, _(3, 1, "Wheel not detected or support not enabled\n"));
		return EXIT_FAILURE;
	}
	if (keyname) {
		if (stricmp(keyname, "updn") == 0) {
			set_wheel_keys(data, 0, 0x48, 0x50);
			printf(_(1, 4, "Generate Up Arrow / Down Arrow key presses on wheel movement\n"));
		} else if (stricmp(keyname, "pageupdn") == 0) {
			set_wheel_keys(data, 0, 0x49, 0x51);
			printf(_(1, 5, "Generate PageUp / PageDown key presses on wheel movement\n"));
		} else {
			fprintf(stderr, _(3, 2, "Unknown key '%s'\n"), keyname);
			return EXIT_FAILURE;
		}
	} else {
		printf(_(1, 6, "Disabling wheel keystroke generation\n"));
		set_wheel_keys(data, 0, 0, 0);
	}
	return EXIT_SUCCESS;
}

static int set_hwheel_key(LPTSRDATA data, const char *keyname)
{
	if (!data->usewheel) {
		fprintf(stderr, _(3, 1, "Wheel not detected or support not enabled\n"));
		return EXIT_FAILURE;
	}
	if (keyname) {
		if (stricmp(keyname, "lr") == 0) {
			set_wheel_keys(data, 1, 0x4B, 0x4D);
			printf(_(1, 4, "Generate Up Arrow / Down Arrow key presses on wheel movement\n"));
		} else {
			fprintf(stderr, _(3, 2, "Unknown key '%s'\n"), keyname);
			return EXIT_FAILURE;
		}
	} else {
		printf(_(1, 6, "Disabling wheel keystroke generation\n"));
		set_wheel_keys(data, 1, 0, 0);
	}
	return EXIT_SUCCESS;
}
#endif /* USE_WHEEL */

#if USE_VIRTUALBOX
static int set_virtualbox_integration(LPTSRDATA data, bool enable, bool verbose)
{
	if (enable) {
		int err;

		data->vbavail = false; // Reinitialize it even if already enabled

		err = vbox_init_device(&data->vb);
		if (err) {
			if (verbose) fprintf(stderr, _(3, 3, "Cannot find VirtualBox PCI device, err=%d\n"), err);
			return err;
		}

		err = vbox_init_buffer(&data->vb, VBOX_BUFFER_SIZE);
		if (err) {
			if (verbose) fprintf(stderr, _(3, 4, "Cannot lock buffer used for VirtualBox communication, err=%d\n"), err);
			return err;
		}

		err = vbox_report_guest_info(&data->vb, VBOXOSTYPE_DOS);
		if (err) {
			if (verbose) fprintf(stderr, _(3, 5, "VirtualBox communication is not working, err=%d\n"), err);
			return err;
		}

		printf(_(1, 7, "VirtualBox integration enabled\n"));
		data->vbavail = true;
		data->vbhaveabs = true;
	} else {
		if (data->vbavail) {
			vbox_set_mouse(&data->vb, false, false);

			vbox_release_buffer(&data->vb);

			printf(_(1, 8, "Disabled VirtualBox integration\n"));
			data->vbavail = false;
			data->vbhaveabs = false;
		} else {
			if (verbose) printf(_(1, 9, "VirtualBox integration already disabled or not available\n"));
		}
	}

	return 0;
}

static int set_virtualbox_host_cursor(LPTSRDATA data, bool enable)
{
	printf(_(1, 10, "Setting host cursor to %s\n"), enable ? _(1, 2, "enabled") : _(1, 3, "disabled"));
	data->vbwantcursor = enable;

	return 0;
}
#endif

#if USE_VMWARE
static int set_vmware_integration(LPTSRDATA data, bool enable, bool verbose)
{
	if (enable) {
		int32_t version;
		uint32_t status;
		uint16_t data_avail;

		data->vmwavail = false;

		version = vmware_get_version();
		if (version < 0) {
			if (verbose) fprintf(stderr, _(3, 6, "Could not detect VMware, err=%ld\n"), version);
			return -1;
		}

		if (verbose) printf(_(1, 11, "Found VMware protocol version %ld\n"), version);

		vmware_abspointer_cmd(VMWARE_ABSPOINTER_CMD_ENABLE);

		status = vmware_abspointer_status();
		if ((status & VMWARE_ABSPOINTER_STATUS_MASK_ERROR)
		        == VMWARE_ABSPOINTER_STATUS_MASK_ERROR) {
			fprintf(stderr, _(3, 7, "VMware absolute pointer error, err=0x%lx\n"),
			        status & VMWARE_ABSPOINTER_STATUS_MASK_ERROR);
			return -1;
		}

		vmware_abspointer_data_clear();

		// TSR part will enable the absolute mouse when reset

		printf(_(1, 12, "VMware integration enabled\n"));
		data->vmwavail = true;
	} else {
		if (data->vmwavail) {
			vmware_abspointer_cmd(VMWARE_ABSPOINTER_CMD_REQUEST_RELATIVE);
			vmware_abspointer_cmd(VMWARE_ABSPOINTER_CMD_DISABLE);

			data->vmwavail = false;
			printf(_(1, 13, "Disabled VMware integration\n"));
		} else {
			if (verbose) printf(_(1, 14, "VMware integration already disabled or not available\n"));
		}
	}

	return 0;
}
#endif

static int set_integration(LPTSRDATA data, bool enable, bool verbose)
{
	if (enable) {
		int err = -1;

#if USE_VIRTUALBOX
		// First check if we can enable the VirtualBox integration,
		// since it's a PCI device it's easier to check if it's not present
		err = set_virtualbox_integration(data, true, verbose);
		if (!err) return 0;
#endif

#if USE_VMWARE
		// Afterwards try VMWare integration
		err = set_vmware_integration(data, true, verbose);
		if (!err) return 0;
#endif

		printf(_(1, 15, "Neither VirtualBox nor VMware integration available\n"));
		return err;
	} else {
#if USE_VIRTUALBOX
		if (data->vbavail) {
			set_virtualbox_integration(data, false, verbose);
		}
#endif
#if USE_VMWARE
		if (data->vmwavail) {
			set_vmware_integration(data, false, verbose);
		}
#endif
		return 0;
	}
}

static int set_host_cursor(LPTSRDATA data, bool enable)
{
#if USE_VIRTUALBOX
	if (data->vbavail) {
		return set_virtualbox_host_cursor(data, enable);
	}
#endif
	printf(_(1, 16, "VirtualBox integration not available\n"));
	return -1;
}

static int configure_driver_ps2(LPTSRDATA data)
{
	int err;

	// Check for PS/2 mouse BIOS availability
	if ((err = ps2m_init(PS2M_PACKET_SIZE_STD))) {
		return err;
	}

	// OK, if BIOS gives no error, assume PS/2 mouse is present and use it
	data->port = 0;
	data->port_io = 0;
	data->port_irq = 0;

#if USE_WHEEL
	// Let's utilize the wheel by default
	data->usewheel = true;
	detect_ps2_wheel(data);
#else
	// Without ImEX/wheel detection, hardcode number of buttons
	data->num_buttons = 3;
	data->num_wheels = 0;
#endif

#if USE_INTEGRATION
	// Enable integration by default
	set_integration(data, true, false);
#endif

#if USE_VIRTUALBOX
	// Assume initially that we want host cursor
	data->vbwantcursor = data->vbavail;
#endif

	return 0;
}

#if USE_SERIAL
static int configure_driver_serial(LPTSRDATA data, int port, unsigned iobase)
{
	struct serial_config serconfig;
	unsigned delay;
	char sig = 0;

	if (!iobase) {
		dprintf("Skip search on COM%u because no IO base found\n", port);
		return -1;
	}

#if ENABLE_DLOG && DLOG_TARGET == DLOG_TARGET_SERIAL
	if (iobase == DLOG_TARGET_PORT) {
		dprintf("Skip search on COM%u because it would overlap with dlog %x\n", port, iobase);
		return -2;
	}
#endif

	dprintf("Detecting mouse on COM%d, iobase %xh\n", port, iobase);
	serial_save_config(iobase, &serconfig);
	serial_configure_interrupts(iobase, SERIAL_IER_NONE); // disable interrupts for now
	// 1200 bps, word length = 7, parity = none
	serial_configure_line(iobase, SERIAL_DIVISOR_1200, SERIAL_LCR_WL_7|SERIAL_LCR_PAR_NONE);
	serial_set_fifo_control(iobase, SERIAL_FCR_FIFO_RESET|SERIAL_FCR_FIFO_ENABLE);
	// Enables DRT, but clears RTS, so that mouse enters reset state
	serial_set_modem_control(iobase, SERIAL_MCR_DTR);
	dputs("DTR ON, RTS OFF");

	// Wait for 3 ticks (100-150ms) for mouse to power off
	bda_wait_ticks(3);

	// Now turn on the mouse by enabling RTS
	serial_set_modem_control(iobase, SERIAL_MCR_DTR | SERIAL_MCR_RTS);
	dputs("DTR ON, RTS ON");

	// Wait up to 10 ticks (550ms) for the mouse to send something we understand
	for (delay = 10; delay > 0; delay--) {
		while (serial_data_ready(iobase)) {
			uint8_t car = serial_read_data(iobase);

			// Is this something we recognize ?
			dprintf("serial data after reset: 0x%hx '%c'\n", car, car);
			if (car == 'M') {
				// Ok, got the MS signature, break out of this wait
				sig = car;
				break;
			}
		}

		if (sig) break;
		bda_wait_tick();
		dprintf("remaining ticks %u\n", delay);
	}


	switch (sig) {
	case 'M':
		// We have a valid MS-style serial mouse
		data->port = port;
		data->device_id = SERMOUSE_DEVICE_ID_MS;
		data->port_io = iobase;
		data->port_irq = serial_get_irq(port);
		data->num_buttons = 2;
		data->num_wheels = 0;
		data->packet_size = 3;

		// Wait for an extended signature for about 2 ticks (50-100ms)
		sig = 0;
		for (delay = 2; delay > 0; delay--) {
			while (serial_data_ready(iobase)) {
				uint8_t car = serial_read_data(iobase);

				dprintf("serial data after 'M': 0x%hx '%c'\n", car, car);
				if (car == '3' || car == 'Z') {
					sig = car;
					break;
				}
			}

			if (sig) break;
			bda_wait_tick();
			dprintf("2nd loop remaining ticks %u\n", delay);
		}

		// Update the mouse details based on the extended signature
		// We don't change the device ID since we treat all the same.
		switch (sig) {
		case '3':
			data->packet_size = 4;
			data->num_buttons = 3;
			break;
		case 'Z':
			data->packet_size = 4;
			data->num_buttons = 3;
#if USE_WHEEL
			data->num_wheels = 1;
#endif
			break;
		}

		// In any case, we got ourselves a mouse.
		return 0;
	}

	// No mouse found on this port.
	serial_restore_config(iobase, &serconfig);
	return -3;
}
#endif

/// Auto-configure the TSR. Try to detect which mouse we have connected and enable all possible integrations.
static int configure_driver(LPTSRDATA data, unsigned num_ports, int ports[])
{
	int errs[MAX_PORTS+1] = {0};
	unsigned portidx;
	bool found_mouse = false;

	// Configure the debug logging port
	dlog_init();

	// Search for a mouse
	for (portidx = 0; portidx < num_ports; portidx++) {
		int port = ports[portidx];
		if (port == 0) {
			// PS/2
			int err = configure_driver_ps2(data);
			if (!err) {
				printf(_(1, 0, "Found PS/2 mouse with %u buttons, %u wheels\n"),
				       data->num_buttons, data->num_wheels);
				found_mouse = true;
				break;
			} else {
				// Remember error to print out later only if no mouse was found
				errs[portidx] = err;
			}
		} else {
#if USE_SERIAL
			int err = configure_driver_serial(data, port, serial_get_iobase(port));
			if (!err) {
				printf(_(1, 22, "Found serial mouse on COM%u with %u buttons, %u wheels\n"),
				       port, data->num_buttons, data->num_wheels);
				found_mouse = true;
				break;
			} else {
				errs[portidx] = err;
			}
#endif
		}
	}

	if (!found_mouse) {
		// If we are here, we have neither serial nor PS/2.
		// Print all error messages now.
		for (portidx = 0; portidx < num_ports; portidx++) {
			int port = ports[portidx];
			int err = errs[portidx];

			if (err) {
				if (port == 0) {
					fprintf(stderr, _(3, 8, "Cannot init PS/2 mouse BIOS, err=%d\n"), err);
				} else {
					fprintf(stderr, _(3, 15, "Cannot find mouse in COM%u, err=%d\n"), port, err);
				}
			}
		}

		fprintf(stderr, _(3, 14, "No mouse found\n"));
		return -1;
	}

	// Otherwise, we found a mouse, go ahead with installation

	// No more interruptions from now on and until we TSR.
	// Inserting ourselves in the interrupt chain should be atomic.
	_disable();

	// Hook hardware interrupts. Which interrupts depends on which mouse was found.
	data->prev_irq3_4_handler = 0;
#if USE_SERIAL
	if (data->port_irq) {
		dprintf("Hooking irq%hu (int%x) for serial\n", data->port_irq, 0x8 + data->port_irq);
		data->prev_irq3_4_handler = _dos_getvect(0x8 + data->port_irq);
		_dos_setvect(0x8 + data->port_irq, data:>irq3_4_isr);
	}
#endif

	return 0;
}

static int move_driver_to_umb(LPTSRDATA __far * data)
{
	segment_t cur_seg = FP_SEG(*data);
	segment_t umb_seg = reallocate_to_umb(cur_seg,  get_resident_size() + DOS_PSP_SIZE);

	if (umb_seg) {
		// Update the data pointer with the new segment
		*data = MK_FP(umb_seg, FP_OFF(*data));
		return 0;
	} else {
		return -1;
	}
}

static __declspec(aborts) int install_driver(LPTSRDATA data, bool high)
{
	const unsigned int resident_size = DOS_PSP_SIZE + get_resident_size();

	_disable();

	// Hook main interrupts
	data->prev_int33_handler = _dos_getvect(0x33);
	_dos_setvect(0x33, data:>int33_isr);

#if USE_WIN386
	data->prev_int2f_handler = _dos_getvect(0x2f);
	_dos_setvect(0x2f, data:>int2f_isr);
#else
	data->prev_int2f_handler = 0;
#endif

	printf(_(1, 17, "Driver installed\n"));

	// If we reallocated ourselves to UMB,
	// it's time to free our initial conventional memory allocation
	if (high) {
		finish_reallocation(_psp, FP_SEG(data));
	}

	kittenclose();
	_dos_keep(EXIT_SUCCESS, get_paragraphs(resident_size));

	// Shouldn't reach this part
	return EXIT_FAILURE;
}

static bool check_if_driver_uninstallable(LPTSRDATA data)
{
	// Compare the segment of the installed handler to see if its ours
	// or someone else's
	if (data->prev_int33_handler) {
		void (__interrupt __far *cur_int33_handler)() = _dos_getvect(0x33);

		if (FP_SEG(cur_int33_handler) != FP_SEG(data)) {
			fprintf(stderr, _(3, 9, "INT%X has been hooked by someone else, cannot safely remove\n"), 0x33);
			return false;
		}
	}

	if (data->port_irq && data->prev_irq3_4_handler) {
		void (__interrupt __far *cur_irq3_4_handler)() = _dos_getvect(0x8 + data->port_irq);

		if (FP_SEG(cur_irq3_4_handler) != FP_SEG(data)) {
			fprintf(stderr, _(3, 9, "INT%X has been hooked by someone else, cannot safely remove\n"), 0x8 + data->port_irq);
			return false;
		}
	}

	if (data->prev_int2f_handler) {
		void (__interrupt __far *cur_int2f_handler)() = _dos_getvect(0x2f);

		if (FP_SEG(cur_int2f_handler) != FP_SEG(data)) {
			fprintf(stderr, _(3, 9, "INT%X has been hooked by someone else, cannot safely remove\n"), 0x2F);
			return false;
		}
	}

	return true;
}

static void unconfigure_driver(LPTSRDATA data)
{
	if (data->port == 0) {
		// PS/2 mode

		// Turn off PS2 BIOS, and remove callback
		ps2m_enable(false);
		ps2m_set_callback(0);

#if USE_INTEGRATION
		set_integration(data, false, false);
#endif
	} else {
#if USE_SERIAL
		// Serial mode
		uint16_t iobase = data->port_io;

		// Disable interrupts, and clear RTS/DTS, which should completely power down mouse
		serial_configure_interrupts(iobase, 0);
		serial_set_modem_control(iobase, 0);

		// TODO Should I mask the serial IRQ on the PIC too?
#endif
	}

	// Unhook only configured hardware-related interrupts
	_disable();
	if (data->port_irq && data->prev_irq3_4_handler) {
		_dos_setvect(0x8 + data->port_irq, data->prev_irq3_4_handler);
		data->prev_irq3_4_handler = 0;
	}
	_enable();
}

static void uninstall_driver(LPTSRDATA data)
{
	// Unhook all interrupts
	_disable();
	if (data->prev_int33_handler) {
		_dos_setvect(0x33, data->prev_int33_handler);
		data->prev_int33_handler = 0;
	}
	if (data->port_irq && data->prev_irq3_4_handler) {
		_dos_setvect(0x8 + data->port_irq, data->prev_irq3_4_handler);
		data->prev_irq3_4_handler = 0;
	}
	if (data->prev_int2f_handler) {
		_dos_setvect(0x2f, data->prev_int2f_handler);
		data->prev_int2f_handler = 0;
	}
	_enable();

	// Find and deallocate the PSP (including the entire program),
	// it is always 256 bytes (16 paragraphs) before the TSR segment
	dos_free(FP_SEG(data) - (DOS_PSP_SIZE/16));

	printf(_(1, 18, "Driver uninstalled\n"));
}

static int driver_reset(void)
{
	printf(_(1, 19, "Reset mouse driver\n"));
	return int33_reset() == INT33_MOUSE_FOUND;
}

static int driver_not_found(void)
{
	fprintf(stderr, _(3, 11, "Driver data not found (driver not installed?)\n"));
	return EXIT_FAILURE;
}

static void print_help(void)
{
	putchar('\n');
	puts(_(0, 0,  "Usage: "));
	puts(_(0, 1,  "  VBMOUSE <ACTION> <ARGS..>"));
	putchar('\n');
	puts(_(0, 2,  "Supported actions and options:"));
	puts(_(0, 3,  "  install                 Install the driver (default)."));
	puts(_(0, 4,  "    low                     Install in conventional memory (otherwise UMB)."));
#if USE_SERIAL
	puts(_(0, 5,  "    ps2, com1, com2, ...    Specify on which ports to search a mouse."));
#endif
	puts(_(0, 6,  "  uninstall               Uninstall the driver from memory."));
#if USE_SERIAL
	puts(_(0, 7,  "  rescan <ps2|com1|..>    Re-scan for mouse in specified ports."));
#endif
#if USE_WHEEL
	puts(_(0, 8,  "  wheel <ON|OFF>          Enable/disable wheel API support."));
	puts(_(0, 9,  "  wheelkey <KEY|OFF>      Emulate a specific keystroke on wheel scroll."));
	puts(_(0, 10, "                            Supported keys: updn, pageupdn."));
#if USE_IMEX
	puts(_(0, 11,  "                            Supported keys: updn, pageupdn."));
	puts(_(0, 12,  "                            Supported keys: updn, pageupdn."));
#endif
#endif
#if USE_INTEGRATION
	puts(_(0, 13,  "  integ <ON|OFF>          Enable/disable VirtualBox integration."));
	puts(_(0, 14, "  hostcur <ON|OFF>        Enable/disable mouse cursor rendering in the host."));
#endif
	puts(_(0, 15, "  reset                   Reset mouse driver."));
}

static int invalid_arg(const char *s)
{
	fprintf(stderr, _(3, 12, "Invalid argument '%s'\n"), s);
	print_help();
	return EXIT_FAILURE;
}

static int arg_required(const char *s)
{
	fprintf(stderr, _(3, 13, "Argument required for '%s'\n"), s);
	print_help();
	return EXIT_FAILURE;
}

static bool is_true(const char *s)
{
	return stricmp(s, "yes") == 0
	       || stricmp(s, "y") == 0
	       || stricmp(s, "on") == 0
	       || stricmp(s, "true") == 0
	       || stricmp(s, "enabled") == 0
	       || stricmp(s, "enable") == 0
	       || stricmp(s, "1") == 0;
}

static bool is_false(const char *s)
{
	return stricmp(s, "no") == 0
	       || stricmp(s, "n") == 0
	       || stricmp(s, "off") == 0
	       || stricmp(s, "false") == 0
	       || stricmp(s, "disabled") == 0
	       || stricmp(s, "disable") == 0
	       || stricmp(s, "0") == 0;
}

static int parse_port(const char *s)
{
	if (stricmp(s, "ps2") == 0) {
		return 0;
#if USE_SERIAL
	} else if (strnicmp(s, "com", 3) == 0 && s[4] == '\0'
	           && s[3] >= '0' && s[3] <= '9') {
		// "COMn" string
		return s[3] - '0';
#endif
	} else {
		return -1;
	}
}

static int default_port_order(int ports[])
{
	const unsigned num_com_ports = MIN(serial_num_ports(), MAX_PORTS);
	unsigned portidx = 0, port;
	if (ps2m_installed()) ports[portidx++] = 0; // 1st. PS2
	// 2nd. COMn in order
	for (port = 1; port <= num_com_ports; port++) {
		ports[portidx++] = port;
	}
	return portidx;
}

int main(int argc, const char *argv[])
{
	LPTSRDATA data = get_tsr_data(true);
	int err, argi = 1;

	cat = kittenopen("vbmouse");

	printf(_(1, 20, "\nVBMouse %x.%x (reporting as MSMOUSE %x.%x)\n"), VERSION_MAJOR, VERSION_MINOR, REPORTED_VERSION_MAJOR, REPORTED_VERSION_MINOR);

	if (argi >= argc || stricmp(argv[argi], "install") == 0) {
		bool high = true;
		int portidx = 0;
		int ports[1+MAX_PORTS] = {-1};

		argi++;
		for (; argi < argc; argi++) {
			int port;
			if (stricmp(argv[argi], "low") == 0) {
				high = false;
			} else if (stricmp(argv[argi], "high") == 0) {
				high = true;
			} else if ((port = parse_port(argv[argi])) >= 0) {
				if (portidx > MAX_PORTS) return invalid_arg(argv[argi]);
				if (port < 0 || port > MAX_PORTS) return invalid_arg(argv[argi]);
				ports[portidx++] = port;
			} else {
				return invalid_arg(argv[argi]);
			}
		}
		if (!portidx) {
			// User has not specified custom search order, so init with default
			portidx = default_port_order(ports);
		}

		if (data) {
			printf(_(1, 21, "VBMouse already installed\n"));
			print_help();
			return EXIT_SUCCESS;
		}

		data = get_tsr_data(false);
		if (high) {
			err = move_driver_to_umb(&data);
			if (err) high = false; // Not fatal
		} else {
			deallocate_environment(_psp);
		}
		err = configure_driver(data, portidx, ports);
		if (err) {
			if (high) cancel_reallocation(FP_SEG(data));
			return EXIT_FAILURE;
		}

		return install_driver(data, high);
	} else if (stricmp(argv[argi], "uninstall") == 0) {
		if (!data) return driver_not_found();
		if (!check_if_driver_uninstallable(data)) {
			return EXIT_FAILURE;
		}
		unconfigure_driver(data);
		uninstall_driver(data);
		return EXIT_SUCCESS;
	} else if (stricmp(argv[argi], "rescan") == 0) {
		int portidx = 0, port;
		int ports[1+MAX_PORTS] = {-1};

		argi++;
		for (; argi < argc; argi++) {
			int port;
			if ((port = parse_port(argv[argi])) >= 0) {
				if (portidx > MAX_PORTS) return invalid_arg(argv[argi]);
				if (port < 0 || port > MAX_PORTS) return invalid_arg(argv[argi]);
				ports[portidx++] = port;
			} else {
				return invalid_arg(argv[argi]);
			}
		}
		if (!portidx) {
			portidx = default_port_order(ports);
		}

		// Unhook the driver
		if (!data) return driver_not_found();
		if (!check_if_driver_uninstallable(data)) {
			return EXIT_FAILURE;
		}
		unconfigure_driver(data);

		// Configure the driver again
		err = configure_driver(data, portidx, ports);
		if (err) {
			return EXIT_FAILURE;
		}

		// Force a reset of the driver
		driver_reset();

		return EXIT_SUCCESS;
#if USE_WHEEL
	} else if (stricmp(argv[argi], "wheel") == 0) {
		bool enable = true;

		if (!data) return driver_not_found();

		argi++;
		if (argi < argc) {
			if (is_false(argv[argi])) enable = false;
		}

		return set_wheel(data, enable);
	} else if (stricmp(argv[argi], "wheelkey") == 0) {
		bool enable = true;
		const char *key = 0;

		if (!data) return driver_not_found();

		argi++;
		if (argi < argc) {
			if (is_false(argv[argi])) enable = false;
			else                      key = argv[argi];
		}

		if (enable) {
			if (!key) return arg_required("wheelkey");
			return set_wheel_key(data, key);
		} else {
			return set_wheel_key(data, 0);
		}
	} else if (stricmp(argv[argi], "hwheelkey") == 0) {
		bool enable = true;
		const char *key = 0;

		if (!data) return driver_not_found();

		argi++;
		if (argi < argc) {
			if (is_false(argv[argi])) enable = false;
			else                      key = argv[argi];
		}

		if (enable) {
			if (!key) return arg_required("hwheelkey");
			return set_hwheel_key(data, key);
		} else {
			return set_hwheel_key(data, 0);
		}
#endif
#if USE_INTEGRATION
	} else if (stricmp(argv[argi], "integ") == 0) {
		bool enable = true;

		if (!data) return driver_not_found();

		argi++;
		if (argi < argc) {
			if (is_false(argv[argi])) enable = false;
		}

		return set_integration(data, enable, true);
	} else if (stricmp(argv[argi], "hostcur") == 0) {
		bool enable = true;

		if (!data) return driver_not_found();

		argi++;
		if (argi < argc) {
			if (is_false(argv[argi])) enable = false;
		}

		// Reset before changing this to ensure the cursor is not drawn
		int33_reset();

		return set_host_cursor(data, enable);
#endif
	} else if (stricmp(argv[argi], "reset") == 0) {
		return driver_reset();
	} else {
		return invalid_arg(argv[argi]);
	}
}