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+/*
+ * VBMouse - DOS mouse driver resident part
+ * 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 <stdlib.h>
+#include <string.h>
+#include <i86.h>
+
+#include "dlog.h"
+#include "ps2.h"
+#include "int10vga.h"
+#include "int16kbd.h"
+#include "int2fwin.h"
+#include "int33.h"
+#include "vbox.h"
+#include "vmware.h"
+#include "mousetsr.h"
+
+#define MSB_MASK 0x8000U
+
+TSRDATA data;
+
+static const uint16_t default_cursor_graphic[] = {
+ 0x3FFF, 0x1FFF, 0x0FFF, 0x07FF,
+ 0x03FF, 0x01FF, 0x00FF, 0x007F,
+ 0x003F, 0x001F, 0x01FF, 0x00FF,
+ 0x30FF, 0xF87F, 0xF87F, 0xFCFF,
+ 0x0000, 0x4000, 0x6000, 0x7000,
+ 0x7800, 0x7C00, 0x7E00, 0x7F00,
+ 0x7F80, 0x7C00, 0x6C00, 0x4600,
+ 0x0600, 0x0300, 0x0300, 0x0000
+};
+
+/** Constraint current mouse position to the user-set window. */
+static void bound_position_to_window(void)
+{
+ if (data.pos.x < data.min.x) data.pos.x = data.min.x;
+ if (data.pos.x > data.max.x) data.pos.x = data.max.x;
+ if (data.pos.y < data.min.y) data.pos.y = data.min.y;
+ if (data.pos.y > data.max.y) data.pos.y = data.max.y;
+}
+
+/** Constraints coordinate value to the desired granularity,
+ * which must be a power of two. */
+static inline int16_t snap_to_grid(int16_t val, int16_t granularity)
+{
+ // Build a bitmask that masks away the undesired low-order bits
+ return val & (-granularity);
+}
+
+static void hide_text_cursor(void)
+{
+ // Restore the character under the old position of the cursor
+ uint16_t __far *ch = get_video_char(&data.video_mode,
+ data.cursor_pos.x / 8, data.cursor_pos.y / 8);
+ *ch = data.cursor_prev_char;
+ data.cursor_visible = false;
+}
+
+static void show_text_cursor(void)
+{
+ uint16_t __far *ch = get_video_char(&data.video_mode,
+ data.pos.x / 8, data.pos.y / 8);
+ data.cursor_prev_char = *ch;
+ data.cursor_pos = data.pos;
+ *ch = (*ch & data.cursor_text_and_mask) ^ data.cursor_text_xor_mask;
+ data.cursor_visible = true;
+}
+
+/** Given the new position of the cursor, compute the both our source
+ * (i.e. the mouse cursor shape) and target clipping areas.
+ * @param cursor_pos cursor position
+ * @param start top left corner of clipping box in screen
+ * @param size size of the clipping box in screen as well as cursor shape
+ * @param offset top left corner of clipping box in mouse cursor shape */
+static bool get_graphic_cursor_area(struct point __far *cursor_pos,
+ struct point __far *start,
+ struct point __far *size,
+ struct point __far *offset)
+{
+ start->x = (cursor_pos->x / data.screen_scale.x) - data.cursor_hotspot.x;
+ start->y = (cursor_pos->y / data.screen_scale.y) - data.cursor_hotspot.y;
+ size->x = GRAPHIC_CURSOR_WIDTH;
+ size->y = GRAPHIC_CURSOR_HEIGHT;
+ offset->x = 0;
+ offset->y = 0;
+
+ // Start clipping around
+ // Cursor is left/top of visible area
+ if (start->x <= -size->x) {
+ return false;
+ } else if (start->x < 0) {
+ offset->x += -start->x;
+ size->x -= -start->x;
+ start->x = 0;
+ }
+ if (start->y <= -size->y) {
+ return false;
+ } else if (start->y < 0) {
+ offset->y += -start->y;
+ size->y -= -start->y;
+ start->y = 0;
+ }
+ // Cursor is right/bottom of visible area
+ if (start->x > data.video_mode.pixels_width) {
+ return false; // Don't render cursor
+ } else if (start->x + size->x > data.video_mode.pixels_width) {
+ size->x -= (start->x + size->x) - data.video_mode.pixels_width;
+ }
+ if (start->y > data.video_mode.pixels_height) {
+ return false;
+ } else if (start->y + size->y > data.video_mode.pixels_height) {
+ size->y -= (start->y + size->y) - data.video_mode.pixels_height;
+ }
+
+ return true;
+}
+
+static inline uint8_t * get_prev_graphic_cursor_scanline(unsigned bytes_per_line,
+ unsigned num_lines,
+ unsigned plane,
+ unsigned y)
+{
+ return &data.cursor_prev_graphic[((plane * num_lines) + y) * bytes_per_line];
+}
+
+static inline uint16_t get_graphic_cursor_and_mask_line(unsigned y)
+{
+ return data.cursor_graphic[y];
+}
+
+static inline uint16_t get_graphic_cursor_xor_mask_line(unsigned y)
+{
+ return data.cursor_graphic[GRAPHIC_CURSOR_HEIGHT + y];
+}
+
+/** Compute the total number of bytes between start and end pixels,
+ * rounding up as necessary to cover all bytes. */
+static inline unsigned get_scanline_segment_bytes(unsigned bits_per_pixel, unsigned start, unsigned size)
+{
+ // Get starting byte (round down)
+ unsigned start_byte = (start * bits_per_pixel) / 8;
+ // Get end byte (round up)
+ unsigned end_byte = (((start + size) * bits_per_pixel) + (8-1)) / 8;
+
+ return end_byte - start_byte;
+}
+
+/** Creates a bitmask that extracts the topmost N bits of a byte. */
+static inline uint8_t build_pixel_mask(unsigned bits_per_pixel)
+{
+ if (bits_per_pixel == 1) return 0x80;
+ else if (bits_per_pixel == 2) return 0xC0;
+ else if (bits_per_pixel == 4) return 0xF0;
+ else return 0xFF;
+}
+
+/** Hides the graphical mouse cursor, by restoring the contents of
+ * data.cursor_prev_graphic (i.e. what was below the cursor before we drew it)
+ * to video memory. */
+static void hide_graphic_cursor(void)
+{
+ struct modeinfo *info = &data.video_mode;
+ struct point start, size, offset;
+ unsigned cursor_bytes_per_line;
+ unsigned plane, y;
+
+ // Compute the area where the cursor is currently positioned
+ if (!get_graphic_cursor_area(&data.cursor_pos, &start, &size, &offset)) {
+ return;
+ }
+
+ // For each scanline, we will copy this amount of bytes
+ cursor_bytes_per_line = get_scanline_segment_bytes(info->bits_per_pixel,
+ start.x, size.x);
+
+ for (plane = 0; plane < info->num_planes; plane++) {
+ if (info->num_planes > 1) vga_select_plane(plane);
+
+ for (y = 0; y < size.y; y++) {
+ uint8_t __far *line = get_video_scanline(info, start.y + y)
+ + (start.x * info->bits_per_pixel) / 8;
+ uint8_t *prev = get_prev_graphic_cursor_scanline(cursor_bytes_per_line, size.y,
+ plane, y);
+
+ // Restore this scaline from cursor_prev
+ _fmemcpy(line, prev, cursor_bytes_per_line);
+ }
+ }
+
+ data.cursor_visible = false;
+}
+
+/** Renders the graphical cursor.
+ * It will also backup whatever pixels are below
+ * the cursor area to cursor_prev_graphic. */
+static void show_graphic_cursor(void)
+{
+ const struct modeinfo *info = &data.video_mode;
+ struct point start, size, offset;
+ unsigned cursor_bytes_per_line;
+ const uint8_t msb_pixel_mask = build_pixel_mask(info->bits_per_pixel);
+ unsigned plane, y;
+
+ // Compute the area where the cursor is supposed to be drawn
+ if (!get_graphic_cursor_area(&data.pos, &start, &size, &offset)) {
+ return;
+ }
+
+ // For each scanline, we will copy this amount of bytes
+ cursor_bytes_per_line = get_scanline_segment_bytes(info->bits_per_pixel,
+ start.x, size.x);
+
+ for (plane = 0; plane < info->num_planes; plane++) {
+ if (info->num_planes > 1) vga_select_plane(plane);
+
+ for (y = 0; y < size.y; y++) {
+ uint8_t __far *line = get_video_scanline(info, start.y + y)
+ + (start.x * info->bits_per_pixel) / 8;
+ uint8_t *prev = get_prev_graphic_cursor_scanline(cursor_bytes_per_line, size.y,
+ plane, y);
+ uint16_t cursor_and_mask = get_graphic_cursor_and_mask_line(offset.y + y)
+ << offset.x;
+ uint16_t cursor_xor_mask = get_graphic_cursor_xor_mask_line(offset.y + y)
+ << offset.x;
+ unsigned x;
+
+ // First, backup this scanline to prev before any changes
+ _fmemcpy(prev, line, cursor_bytes_per_line);
+
+ if (info->bits_per_pixel < 8) {
+ uint8_t pixel_mask = msb_pixel_mask;
+ uint8_t pixel = *line;
+
+ // when start.x is not pixel aligned,
+ // scaline points the previous multiple of pixels_per_byte;
+ // and the initial pixel will not be at the MSB of it.
+ // advance the pixel_mask accordingly
+ pixel_mask >>= (start.x * info->bits_per_pixel) % 8;
+
+ for (x = 0; x < size.x; x++) {
+ // The MSBs of each mask correspond to the current pixel
+ if (!(cursor_and_mask & MSB_MASK)) {
+ pixel &= ~pixel_mask;
+ }
+ if (cursor_xor_mask & MSB_MASK) {
+ pixel ^= pixel_mask;
+ }
+
+ // Advance to the next pixel
+ pixel_mask >>= info->bits_per_pixel;
+ if (!pixel_mask) {
+ // Time to advance to the next byte
+ *line = pixel; // Save current byte first
+ pixel = *(++line);
+ pixel_mask = msb_pixel_mask;
+ }
+
+ // Advance to the next bit in the cursor mask
+ cursor_and_mask <<= 1;
+ cursor_xor_mask <<= 1;
+ }
+
+ if (pixel_mask != msb_pixel_mask) {
+ // We ended up in the middle of a byte, save it
+ *line = pixel;
+ }
+ } else if (info->bits_per_pixel == 8) {
+ // Simplified version for byte-aligned pixels
+ for (x = 0; x < size.x; x++) {
+ uint8_t pixel = 0;
+
+ if (cursor_and_mask & MSB_MASK) {
+ pixel = *line;
+ }
+ if (cursor_xor_mask & MSB_MASK) {
+ pixel ^= 0x0F; // Use 0x0F as "white pixel"
+ }
+
+ // Advance to the next pixel
+ *line = pixel;
+ ++line;
+
+ // Advance to the next bit in the cursor mask
+ cursor_and_mask <<= 1;
+ cursor_xor_mask <<= 1;
+ }
+ }
+ }
+ }
+
+ data.cursor_pos = data.pos;
+ data.cursor_visible = true;
+}
+
+/** Refreshes cursor position and visibility. */
+static void refresh_cursor(void)
+{
+ bool should_show = data.visible_count >= 0;
+ bool pos_changed, needs_refresh;
+
+#if USE_WIN386
+ // Windows 386 is already rendering the cursor for us.
+ // Hide our own.
+ if (data.w386cursor) should_show = false;
+#endif
+
+#if USE_VIRTUALBOX
+ if (data.vbavail && data.vbwantcursor) {
+ // We want to use the VirtualBox host cursor.
+ // See if we have to update its visibility.
+ int err = 0;
+ if (should_show != data.cursor_visible) {
+ err = vbox_set_pointer_visible(&data.vb, should_show);
+ if (err == 0 && data.vbhaveabs) {
+ data.cursor_visible = should_show;
+ }
+ }
+ if (err == 0 && data.vbhaveabs) {
+ // No need to refresh the cursor; VirtualBox is already showing it for us.
+ return;
+ }
+ }
+#endif
+
+ pos_changed = data.cursor_pos.x != data.pos.x || data.cursor_pos.y != data.pos.y;
+ needs_refresh = should_show && pos_changed || should_show != data.cursor_visible;
+
+ if (!needs_refresh) {
+ // Nothing to do
+ return;
+ }
+
+ if (data.video_mode.type == VIDEO_TEXT) {
+ // Text video mode
+ if (data.cursor_visible) {
+ // Hide the cursor at the old position if any
+ hide_text_cursor();
+ }
+ if (should_show) {
+ // Show the cursor at the new position
+ show_text_cursor();
+ }
+ } else if (data.video_mode.type != VIDEO_UNKNOWN) {
+ // Graphic video modes
+
+ bool video_planar = data.video_mode.num_planes > 1;
+ struct videoregs regs;
+ // If current video mode is planar,
+ // we will have to play with the VGA registers
+ // so let's save and restore them.
+ if (video_planar) {
+ vga_save_registers(&regs);
+ vga_set_graphics_mode(&regs, 0, 0);
+ }
+
+ if (data.cursor_visible) {
+ hide_graphic_cursor();
+ }
+ if (should_show) {
+ show_graphic_cursor();
+ }
+
+ if (video_planar) {
+ vga_restore_register(&regs);
+ }
+ } else {
+ // Unknown video mode, don't render cursor.
+ }
+}
+
+/** Forcefully hides the mouse cursor if shown. */
+static void hide_cursor(void)
+{
+#if USE_VIRTUALBOX
+ if (data.vbavail && data.vbwantcursor) {
+ vbox_set_pointer_visible(&data.vb, false);
+ if (data.vbhaveabs) {
+ data.cursor_visible = false;
+ }
+ }
+#endif
+
+ if (data.cursor_visible) {
+ if (data.video_mode.type == VIDEO_TEXT) {
+ hide_text_cursor();
+ } else if (data.video_mode.type != VIDEO_UNKNOWN) {
+ hide_graphic_cursor();
+ }
+ }
+}
+
+/** Loads the current graphic cursor,
+ * which in this case means uploading it to the host. */
+static void load_cursor(void)
+{
+#if USE_VIRTUALBOX
+ if (data.vbavail && data.vbwantcursor) {
+ VMMDevReqMousePointer *req = (VMMDevReqMousePointer *) data.vb.buf;
+ const unsigned width = GRAPHIC_CURSOR_WIDTH, height = GRAPHIC_CURSOR_HEIGHT;
+ uint8_t *output = req->pointerData;
+ unsigned int y, x;
+
+ memset(req, 0, sizeof(VMMDevReqMousePointer));
+
+ req->header.size = vbox_req_mouse_pointer_size(width, height);
+ req->header.version = VMMDEV_REQUEST_HEADER_VERSION;
+ req->header.requestType = VMMDevReq_SetPointerShape;
+ req->header.rc = -1;
+
+ req->fFlags = VBOX_MOUSE_POINTER_SHAPE;
+ req->xHot = BOUND(data.cursor_hotspot.x, 0, width);
+ req->yHot = BOUND(data.cursor_hotspot.y, 0, height);
+ req->width = width;
+ req->height = height;
+
+ // AND mask
+ // int33 format is 1-bit per pixel packed into 16-bit LE values,
+ // while VirtualBox wants 1-bit per pixel packed into 8-bit.
+ // All we have to do is byteswap 16-bit values.
+ for (y = 0; y < height; ++y) {
+ uint16_t cursor_line = get_graphic_cursor_and_mask_line(y);
+ output[0] = (cursor_line >> 8) & 0xFF;
+ output[1] = cursor_line & 0xFF;
+ output += GRAPHIC_CURSOR_SCANLINE_LEN;
+ }
+
+ // XOR mask
+ // int33 format is again 1-bit per pixel packed into 16-bit LE values,
+ // however VirtualBox wants 4-byte per pixel packed "RGBA".
+ for (y = 0; y < height; ++y) {
+ uint16_t cursor_line = get_graphic_cursor_xor_mask_line(y);
+
+ for (x = 0; x < width; ++x) {
+ // MSB of line is current mask bit, we shift it on each iteration
+ uint8_t val = (cursor_line & MSB_MASK) ? 0xFF : 0;
+
+ output[0] = val;
+ output[1] = val;
+ output[2] = val;
+ output[3] = 0;
+
+ cursor_line <<= 1;
+ output += 4;
+ }
+ }
+
+ dlog_puts("Loading cursor to VBox");
+
+ vbox_send_request(data.vb.iobase, data.vb.dds.physicalAddress);
+
+ if (req->header.rc != 0) {
+ dlog_puts("Could not send cursor to VirtualBox");
+ return;
+ }
+
+ // After we send this message, it looks like VirtualBox shows the cursor
+ // even if we didn't actually want it to be visible at this point.
+ vbox_set_pointer_visible(&data.vb, false);
+ }
+#endif
+}
+
+/** Reloads the information about the current video mode. */
+static void reload_video_info(void)
+{
+ get_current_video_mode_info(&data.video_mode);
+
+ data.screen_max.x = data.video_mode.pixels_width - 1;
+ data.screen_max.y = data.video_mode.pixels_height - 1;
+ data.screen_scale.x = 1;
+ data.screen_scale.y = 1;
+ data.screen_granularity.x = 1;
+ data.screen_granularity.y = 1;
+
+ // The actual range of coordinates expected by int33 clients
+ // is, for some reason, different than real resolution in some modes.
+ // For example, 320x... modes are mapped to 640x... pixels.
+ if (data.video_mode.pixels_width == 320) {
+ data.screen_max.x = 640 - 1;
+ data.screen_scale.x = 640 / 320;
+ }
+
+ // In text modes, we are supposed to always round the mouse cursor
+ // to character boundaries.
+ if (data.video_mode.type == VIDEO_TEXT) {
+ // Always assume 8x8 character size irregardless of true font
+ data.screen_granularity.x = 8;
+ data.screen_granularity.y = 8;
+ }
+
+ dlog_print("Current video mode=");
+ dlog_printx(data.video_mode.mode);
+ dlog_print(" screen_max=");
+ dlog_printd(data.screen_max.x);
+ dlog_putc(',');
+ dlog_printd(data.screen_max.y);
+ dlog_endline();
+}
+
+/** True if the current video is different from what we have stored
+ * and we probably need to recompute video mode info. */
+static inline bool video_mode_changed(void)
+{
+ uint8_t cur_mode = bda_get_video_mode() & ~0x80;
+
+ if (cur_mode != data.video_mode.mode)
+ return true;
+
+ if (data.video_mode.type == VIDEO_TEXT) {
+ // Also check to see if the font size was changed..
+ return data.video_mode.pixels_height != (bda_get_last_row()+1) * 8;
+ } else {
+ return false;
+ }
+}
+
+/** Checks if the video mode has changed and if so
+ * refreshes the information about the current video mode. */
+static void refresh_video_info(void)
+{
+ if (video_mode_changed()) {
+ if (data.cursor_visible) {
+ // Assume cursor is lost with no way to restore prev contents
+ data.cursor_visible = false;
+ }
+
+ reload_video_info();
+
+ if (data.video_mode.type != VIDEO_UNKNOWN) {
+ // If we know the screen size for this mode, then reset the window to it
+ data.min.x = 0;
+ data.min.y = 0;
+ data.max.x = data.screen_max.x;
+ data.max.y = data.screen_max.y;
+ }
+ }
+}
+
+/** Calls the application-registered event handler. */
+static void call_event_handler(void (__far *handler)(), uint16_t events,
+ uint16_t buttons, int16_t x, int16_t y,
+ int16_t delta_x, int16_t delta_y)
+{
+#if TRACE_EVENTS
+ dlog_print("calling event handler events=");
+ dlog_printx(events);
+ dlog_print(" buttons=");
+ dlog_printx(buttons);
+ dlog_print(" x=");
+ dlog_printd(x);
+ dlog_print(" y=");
+ dlog_printd(y);
+ dlog_print(" dx=");
+ dlog_printd(delta_x);
+ dlog_print(" dy=");
+ dlog_printd(delta_y);
+ dlog_endline();
+#endif
+
+ __asm {
+ mov ax, [events]
+ mov bx, [buttons]
+ mov cx, [x]
+ mov dx, [y]
+ mov si, [delta_x]
+ mov di, [delta_y]
+
+ call dword ptr [handler]
+ }
+}
+
+/** Process a mouse event internally.
+ * @param buttons currently pressed buttons as a bitfield
+ * @param absolute whether mouse coordinates are an absolute value
+ * @param x y if absolute, then absolute coordinates in screen pixels
+ * if relative, then relative coordinates in mickeys
+ * @param z relative wheel mouse movement
+ */
+static void handle_mouse_event(uint16_t buttons, bool absolute, int x, int y, int z)
+{
+ uint16_t events = 0;
+ int i;
+
+#if TRACE_EVENTS
+ dlog_print("handle mouse event");
+ if (absolute) dlog_print(" absolute");
+ dlog_print(" buttons=");
+ dlog_printx(buttons);
+ dlog_print(" x=");
+ dlog_printd(x);
+ dlog_print(" y=");
+ dlog_printd(y);
+ dlog_print(" z=");
+ dlog_printd(z);
+ dlog_endline();
+#endif
+
+ if (absolute) {
+ // Absolute movement: x,y are in screen pixels units
+ events |= INT33_EVENT_MASK_ABSOLUTE;
+
+ if (x != data.pos.x || y != data.pos.y) {
+ events |= INT33_EVENT_MASK_MOVEMENT;
+
+ // Simulate a fake relative movement in mickeys
+ // This is almost certainly broken.
+ // Programs that expect relative movement data
+ // will almost never set a mickeyPerPixel value.
+ // So all we can do is guess.
+ if (data.abs_pos.x >= 0 && data.abs_pos.y >= 0) {
+ data.delta.x += (x - data.abs_pos.x) * 8;
+ data.delta.y += (y - data.abs_pos.y) * 8;
+ }
+ data.abs_pos.x = x;
+ data.abs_pos.y = y;
+
+ // Set the new absolute position
+ data.pos.x = x;
+ data.pos.y = y;
+ data.pos_frac.x = 0;
+ data.pos_frac.y = 0;
+ }
+ } else if (x || y) {
+ // Relative movement: x,y are in mickeys
+ uint16_t ticks = bda_get_tick_count_lo();
+ unsigned ax = abs(x), ay = abs(y);
+
+ events |= INT33_EVENT_MASK_MOVEMENT;
+
+ // Check if around one second has passed
+ if ((ticks - data.last_ticks) >= 18) {
+ data.total_motion = 0;
+ data.last_ticks = ticks;
+ }
+
+ // If more than the double speed threshold has been moved in the last second,
+ // double the speed
+ data.total_motion += ax * ax + ay * ay;
+ if (data.total_motion > data.doubleSpeedThreshold * data.doubleSpeedThreshold) {
+ x *= 2;
+ y *= 2;
+ }
+
+ data.delta.x += x;
+ data.delta.y += y;
+ data.delta_frac.x = 0;
+ data.delta_frac.y = 0;
+ data.abs_pos.x = -1;
+ data.abs_pos.y = -1;
+
+ // Convert mickeys into pixels
+ data.pos.x += scalei_rem(x, data.mickeysPerLine.x, 8, &data.pos_frac.x);
+ data.pos.y += scalei_rem(y, data.mickeysPerLine.y, 8, &data.pos_frac.y);
+ }
+
+ bound_position_to_window();
+
+#if USE_WHEEL
+ if (data.haswheel && z) {
+ if (!data.usewheelapi && (data.wheel_up_key || data.wheel_down_key)) {
+ // Emulate keystrokes on wheel movement
+ if (z < 0 && data.wheel_up_key) {
+ for (; z < 0; z++) {
+ int16_store_keystroke(data.wheel_up_key);
+ }
+ } else if (z > 0 && data.wheel_up_key) {
+ for (; z > 0; z--) {
+ int16_store_keystroke(data.wheel_down_key);
+ }
+ }
+ } else {
+ events |= INT33_EVENT_MASK_WHEEL_MOVEMENT;
+ // Higher byte of buttons contains wheel movement
+ buttons |= (z & 0xFF) << 8;
+ // Accumulate delta wheel movement
+ data.wheel_delta += z;
+ data.wheel_last.x = data.pos.x;
+ data.wheel_last.y = data.pos.y;
+ }
+ }
+#endif
+
+ // Update button status
+ for (i = 0; i < NUM_BUTTONS; ++i) {
+ uint8_t btn = 1 << i;
+ uint8_t evt = 0;
+ if ((buttons & btn) && !(data.buttons & btn)) {
+ // Button pressed
+ evt = 1 << (1 + (i * 2)); // Press event mask
+ data.button[i].pressed.count++;
+ data.button[i].pressed.last.x = data.pos.x;
+ data.button[i].pressed.last.y = data.pos.y;
+ } else if (!(buttons & btn) && (data.buttons & btn)) {
+ // Button released
+ evt = 1 << (2 + (i * 2)); // Release event mask
+ data.button[i].released.count++;
+ data.button[i].released.last.x = data.pos.x;
+ data.button[i].released.last.y = data.pos.y;
+ }
+ events |= evt;
+ }
+ data.buttons = buttons;
+
+ refresh_cursor();
+
+ events &= data.event_mask;
+ if (data.event_handler && events) {
+ x = snap_to_grid(data.pos.x, data.screen_granularity.x);
+ y = snap_to_grid(data.pos.y, data.screen_granularity.y);
+
+ call_event_handler(data.event_handler, events,
+ buttons, x, y, data.delta.x, data.delta.y);
+ }
+}
+
+/** PS/2 BIOS calls this routine to notify mouse events. */
+static void ps2_mouse_handler(uint16_t word1, uint16_t word2, uint16_t word3, uint16_t word4)
+{
+#pragma aux ps2_mouse_handler "*" parm caller [ax] [bx] [cx] [dx] modify [ax bx cx dx si di es fs gs]
+
+ unsigned status;
+ int x, y, z;
+ bool abs = false;
+
+#if TRACE_EVENTS
+ dlog_print("ps2 callback ");
+ dlog_printx(word1);
+ dlog_putc(' ');
+ dlog_printx(word2);
+ dlog_putc(' ');
+ dlog_printx(word3);
+ dlog_putc(' ');
+ dlog_printx(word4);
+ dlog_endline();
+#endif /* TRACE_EVENTS */
+
+ // Decode the PS2 event args
+ // In a normal IBM PS/2 BIOS (incl. VirtualBox/Bochs/qemu/SeaBIOS):
+ // word1 low byte = status (following PS2M_STATUS_*)
+ // word2 low byte = x
+ // word3 low byte = y
+ // word4 = always zero
+ // In a PS/2 BIOS with wheel support (incl. VMware/DOSBox-X):
+ // taken from CuteMouse/KoKo:
+ // word1 high byte = x
+ // word1 low byte = status
+ // word2 low byte = y
+ // word3 low byte = z
+ // word4 = always zero
+ // VirtualBox/Bochs/qemu/SeaBIOS behave like a normal one,
+ // but they also store the raw contents of all mouse packets in the EBDA (starting 0x28 = packet 0).
+ // Other BIOSes don't do that so it is not a reliable option either.
+ // So, how to detect which BIOS we have?
+ // For now we are always assuming "normal" PS/2 BIOS.
+ // But with VirtualBox integration on we'll get the wheel packet from the EBDA,
+ // and with VMWare integration on we'll get it from the VMware protocol.
+ status = (uint8_t) word1;
+ x = (uint8_t) word2;
+ y = (uint8_t) word3;
+ z = 0;
+ (void) word4;
+
+ // Sign-extend X, Y as per the status byte
+ x = status & PS2M_STATUS_X_NEG ? 0xFF00 | x : x;
+ y = -(status & PS2M_STATUS_Y_NEG ? 0xFF00 | y : y);
+
+#if USE_VIRTUALBOX
+ if (data.vbavail) {
+ uint16_t vbx, vby;
+ if ((vbox_get_mouse(&data.vb, &abs, &vbx, &vby) == 0) && abs) {
+ // VirtualBox gives unsigned coordinates from 0...0xFFFFU,
+ // scale to 0..screen_size (in pixels).
+ refresh_video_info();
+ // If the user is using a window larger than the screen, use it.
+ x = scaleu(vbx, 0xFFFFU, MAX(data.max.x, data.screen_max.x));
+ y = scaleu(vby, 0xFFFFU, MAX(data.max.y, data.screen_max.y));
+ data.vbhaveabs = true;
+ } else {
+ // VirtualBox does not support absolute coordinates,
+ // or user has disabled them.
+ data.vbhaveabs = false;
+ // Rely on PS/2 relative coordinates.
+ }
+
+#if USE_WHEEL
+ // VirtualBox/Bochs BIOS does not pass wheel data to the callback,
+ // so we will fetch it directly from the BIOS data segment.
+ if (data.haswheel) {
+ int8_t __far * mouse_packet = MK_FP(bda_get_ebda_segment(), 0x28);
+ z = mouse_packet[3];
+ }
+#endif
+ }
+#endif /* USE_VIRTUALBOX */
+
+#if USE_VMWARE
+ if (data.vmwavail) {
+ uint32_t vmwstatus = vmware_abspointer_status();
+ uint16_t data_avail = vmwstatus & VMWARE_ABSPOINTER_STATUS_MASK_DATA;
+
+#if TRACE_EVENTS
+ dlog_print("vmware status=0x");
+ dlog_printx(vmwstatus >> 16);
+ dlog_print(" ");
+ dlog_printx(vmwstatus & 0xFFFF);
+ dlog_endline();
+#endif
+
+ if (data_avail >= VMWARE_ABSPOINTER_DATA_PACKET_SIZE) {
+ struct vmware_abspointer_data vmw;
+ vmware_abspointer_data(VMWARE_ABSPOINTER_DATA_PACKET_SIZE, &vmw);
+
+#if TRACE_EVENTS
+ dlog_print("vmware pstatus=0x");
+ dlog_printx(status);
+ dlog_print(" x=0x");
+ dlog_printx(vmw.x);
+ dlog_print(" z=");
+ dlog_printd((int8_t) (uint8_t) vmw.z);
+ dlog_endline();
+#endif
+
+ if (vmw.status & VMWARE_ABSPOINTER_STATUS_RELATIVE) {
+ x = (int16_t) vmw.x;
+ y = (int16_t) vmw.y;
+ z = (int8_t) (uint8_t) vmw.z;
+ } else {
+ abs = true;
+ // Scale to screen coordinates
+ refresh_video_info();
+ x = scaleu(vmw.x & 0xFFFFU, 0xFFFFU,
+ MAX(data.max.x, data.screen_max.x));
+ y = scaleu(vmw.y & 0xFFFFU, 0xFFFFU,
+ MAX(data.max.y, data.screen_max.y));
+ z = (int8_t) (uint8_t) vmw.z;
+ }
+
+ if (vmw.status & VMWARE_ABSPOINTER_STATUS_BUTTON_LEFT) {
+ status |= PS2M_STATUS_BUTTON_1;
+ }
+ if (vmw.status & VMWARE_ABSPOINTER_STATUS_BUTTON_RIGHT) {
+ status |= PS2M_STATUS_BUTTON_2;
+ }
+ if (vmw.status & VMWARE_ABSPOINTER_STATUS_BUTTON_MIDDLE) {
+ status |= PS2M_STATUS_BUTTON_3;
+ }
+ } else {
+ return; // Ignore the PS/2 packet otherwise, it is likely garbage
+ }
+ }
+#endif /* USE_VMWARE */
+
+ handle_mouse_event(status & (PS2M_STATUS_BUTTON_1 | PS2M_STATUS_BUTTON_2 | PS2M_STATUS_BUTTON_3),
+ abs, x, y, z);
+}
+
+void __declspec(naked) __far ps2_mouse_callback()
+{
+ __asm {
+ pusha
+ push ds
+ push es
+ push fs
+ push gs
+
+ ; 8 + 4 saved registers, 24 bytes
+ ; plus 4 bytes for retf address
+ ; = 28 bytes of stack before callback args
+
+ mov bp, sp
+ push cs
+ pop ds
+
+ mov ax,[bp+28+6] ; Status
+ mov bx,[bp+28+4] ; X
+ mov cx,[bp+28+2] ; Y
+ mov dx,[bp+28+0] ; Z
+
+ call ps2_mouse_handler
+
+ pop gs
+ pop fs
+ pop es
+ pop ds
+ popa
+
+ retf
+ }
+}
+
+#if USE_INTEGRATION
+static void set_absolute(bool enable)
+{
+#if USE_VIRTUALBOX
+ data.vbhaveabs = false;
+ if (data.vbavail) {
+ int err = vbox_set_mouse(&data.vb, enable, false);
+ if (enable && !err) {
+ dlog_puts("VBox absolute mouse enabled");
+ data.vbhaveabs = true;
+ } else if (!enable) {
+ dlog_puts("VBox absolute mouse disabled");
+ }
+ }
+#endif /* USE_VIRTUALBOX */
+#if USE_VMWARE
+ if (data.vmwavail) {
+ if (enable) {
+ uint16_t data_avail;
+ // It looks like a reset of the PS/2 mouse completely disables
+ // the vmware interface, so we have to reenable it from scratch.
+ vmware_abspointer_cmd(VMWARE_ABSPOINTER_CMD_ENABLE);
+ vmware_abspointer_data_clear();
+ vmware_abspointer_cmd(VMWARE_ABSPOINTER_CMD_REQUEST_ABSOLUTE);
+
+ dlog_puts("VMware absolute mouse enabled");
+ } else {
+ vmware_abspointer_cmd(VMWARE_ABSPOINTER_CMD_REQUEST_RELATIVE);
+ vmware_abspointer_cmd(VMWARE_ABSPOINTER_CMD_DISABLE);
+
+ dlog_puts("VMware absolute mouse disabled");
+ }
+ }
+#endif /* USE_VMWARE */
+}
+#endif /* USE_INTEGRATION */
+
+static void reset_mouse_hardware()
+{
+ ps2m_enable(false);
+
+#if USE_WHEEL
+ if (data.usewheel && ps2m_detect_wheel()) {
+ // Detect wheel also reinitializes the mouse to the proper packet size
+ data.haswheel = true;
+ } else {
+ // Otherwise do an extra reset to return back to initial state, just in case
+ data.haswheel = false;
+ ps2m_init(PS2M_PACKET_SIZE_PLAIN);
+ }
+#else
+ ps2m_init(PS2M_PACKET_SIZE_PLAIN);
+#endif
+
+ ps2m_set_resolution(3); // 3 = 200 dpi, 8 counts per millimeter
+ ps2m_set_sample_rate(4); // 4 = 80 reports per second
+ ps2m_set_scaling_factor(1); // 1 = 1:1 scaling
+
+ ps2m_set_callback(get_cs():>ps2_mouse_callback);
+
+#if USE_INTEGRATION
+ // By default, enable absolute mouse
+ set_absolute(true);
+ // Reload hardware cursor
+ load_cursor();
+#endif
+
+ ps2m_enable(true);
+}
+
+/** Reset "software" mouse settings, i.e. those configurable by the client program. */
+static void reset_mouse_settings()
+{
+ data.event_mask = 0;
+ data.event_handler = 0;
+
+ data.mickeysPerLine.x = 8;
+ data.mickeysPerLine.y = 16;
+ data.doubleSpeedThreshold = 64;
+ data.min.x = 0;
+ data.max.x = data.screen_max.x;
+ data.min.y = 0;
+ data.max.y = data.screen_max.y;
+ data.visible_count = -1;
+ data.cursor_text_type = 0;
+ data.cursor_text_and_mask = 0xFFFFU;
+ data.cursor_text_xor_mask = 0x7700U;
+ data.cursor_hotspot.x = 0;
+ data.cursor_hotspot.y = 0;
+ memcpy(data.cursor_graphic, default_cursor_graphic, sizeof(data.cursor_graphic));
+
+#if USE_WHEEL
+ data.usewheelapi = false;
+#endif
+
+ refresh_cursor(); // This will hide the cursor and update data.cursor_visible
+}
+
+/** Reset the current mouse state and throw away past events. */
+static void reset_mouse_state()
+{
+ int i;
+ data.pos.x = data.min.x;
+ data.pos.y = data.min.y;
+ data.pos_frac.x = 0;
+ data.pos_frac.y = 0;
+ data.delta.x = 0;
+ data.delta.y = 0;
+ data.delta_frac.x = 0;
+ data.delta_frac.y = 0;
+ data.abs_pos.x = -1;
+ data.abs_pos.y = -1;
+ data.buttons = 0;
+ for (i = 0; i < NUM_BUTTONS; i++) {
+ data.button[i].pressed.count = 0;
+ data.button[i].pressed.last.x = 0;
+ data.button[i].pressed.last.y = 0;
+ data.button[i].released.count = 0;
+ data.button[i].released.last.x = 0;
+ data.button[i].released.last.y = 0;
+ }
+ data.wheel_delta = 0;
+ data.cursor_visible = false;
+ data.cursor_pos.x = 0;
+ data.cursor_pos.y = 0;
+ data.cursor_prev_char = 0;
+ memset(data.cursor_prev_graphic, 0, sizeof(data.cursor_prev_graphic));
+}
+
+static void return_clear_wheel_counter(union INTPACK __far *r)
+{
+ r->x.cx = snap_to_grid(data.wheel_last.x, data.screen_granularity.x);
+ r->x.dx = snap_to_grid(data.wheel_last.y, data.screen_granularity.y);
+ r->x.bx = data.wheel_delta;
+ data.wheel_last.x = 0;
+ data.wheel_last.y = 0;
+ data.wheel_delta = 0;
+}
+
+static void return_clear_button_counter(union INTPACK __far *r, struct buttoncounter *c)
+{
+ r->x.cx = snap_to_grid(c->last.x, data.screen_granularity.x);
+ r->x.dx = snap_to_grid(c->last.y, data.screen_granularity.y);
+ r->x.bx = c->count;
+ c->last.x = 0;
+ c->last.y = 0;
+ c->count = 0;
+}
+
+/** Entry point for our int33 API. */
+static void int33_handler(union INTPACK r)
+#pragma aux int33_handler "*" parm caller [] modify [ax bx cx dx si di es fs gs]
+{
+ switch (r.x.ax) {
+ case INT33_RESET_MOUSE:
+ dlog_puts("Mouse reset");
+ reload_video_info();
+ reset_mouse_settings();
+ reset_mouse_hardware();
+ reset_mouse_state();
+ r.x.ax = INT33_MOUSE_FOUND;
+ r.x.bx = NUM_BUTTONS;
+ break;
+ case INT33_SHOW_CURSOR:
+ data.visible_count++;
+ refresh_cursor();
+ break;
+ case INT33_HIDE_CURSOR:
+ data.visible_count--;
+ refresh_cursor();
+ break;
+ case INT33_GET_MOUSE_POSITION:
+#if TRACE_EVENTS
+ dlog_puts("Mouse get position");
+#endif
+ r.x.cx = snap_to_grid(data.pos.x, data.screen_granularity.x);
+ r.x.dx = snap_to_grid(data.pos.y, data.screen_granularity.y);
+ r.x.bx = data.buttons;
+#if USE_WHEEL
+ if (data.haswheel) {
+ r.h.bh = data.wheel_delta;
+ data.wheel_delta = 0;
+ }
+#endif
+ break;
+ case INT33_SET_MOUSE_POSITION:
+#if TRACE_EVENTS
+ dlog_puts("Mouse set position");
+#endif
+ data.pos.x = r.x.cx;
+ data.pos.y = r.x.dx;
+ data.pos_frac.x = 0;
+ data.pos_frac.y = 0;
+ data.delta.x = 0;
+ data.delta.y = 0;
+ data.delta_frac.x = 0;
+ data.delta_frac.y = 0;
+ bound_position_to_window();
+ break;
+ case INT33_GET_BUTTON_PRESSED_COUNTER:
+ r.x.ax = data.buttons;
+#if USE_WHEEL
+ if (data.haswheel) {
+ r.h.bh = data.wheel_delta;
+ if (r.x.bx == -1) {
+ // Asked for wheel information
+ return_clear_wheel_counter(&r);
+ break;
+ }
+ }
+#endif
+ // Regular button information
+ return_clear_button_counter(&r,
+ &data.button[MIN(r.x.bx, NUM_BUTTONS - 1)].pressed);
+ break;
+ case INT33_GET_BUTTON_RELEASED_COUNTER:
+ r.x.ax = data.buttons;
+#if USE_WHEEL
+ if (data.haswheel) {
+ r.h.bh = data.wheel_delta;
+ if (r.x.bx == -1) {
+ // Asked for wheel information
+ return_clear_wheel_counter(&r);
+ break;
+ }
+ }
+#endif
+ return_clear_button_counter(&r,
+ &data.button[MIN(r.x.bx, NUM_BUTTONS - 1)].released);
+ break;
+ case INT33_SET_HORIZONTAL_WINDOW:
+ dlog_print("Mouse set horizontal window [");
+ dlog_printd(r.x.cx);
+ dlog_putc(',');
+ dlog_printd(r.x.dx);
+ dlog_puts("]");
+ // Recheck in case someone changed the video mode
+ refresh_video_info();
+ data.min.x = r.x.cx;
+ data.max.x = r.x.dx;
+ bound_position_to_window();
+ break;
+ case INT33_SET_VERTICAL_WINDOW:
+ dlog_print("Mouse set vertical window [");
+ dlog_printd(r.x.cx);
+ dlog_putc(',');
+ dlog_printd(r.x.dx);
+ dlog_puts("]");
+ refresh_video_info();
+ data.min.y = r.x.cx;
+ data.max.y = r.x.dx;
+ bound_position_to_window();
+ break;
+ case INT33_SET_GRAPHICS_CURSOR:
+ dlog_puts("Mouse set graphics cursor");
+ hide_cursor();
+ data.cursor_hotspot.x = r.x.bx;
+ data.cursor_hotspot.y = r.x.cx;
+ _fmemcpy(data.cursor_graphic, MK_FP(r.x.es, r.x.dx), sizeof(data.cursor_graphic));
+ load_cursor();
+ refresh_cursor();
+ break;
+ case INT33_SET_TEXT_CURSOR:
+ dlog_print("Mouse set text cursor ");
+ dlog_printd(r.x.bx);
+ dlog_endline();
+ hide_cursor();
+ data.cursor_text_type = r.x.bx;
+ data.cursor_text_and_mask = r.x.cx;
+ data.cursor_text_xor_mask = r.x.dx;
+ refresh_cursor();
+ break;
+ case INT33_GET_MOUSE_MOTION:
+#if TRACE_EVENTS
+ dlog_puts("Mouse get motion");
+#endif
+ r.x.cx = data.delta.x;
+ r.x.dx = data.delta.y;
+ data.delta.x = 0;
+ data.delta.y = 0;
+ break;
+ case INT33_SET_EVENT_HANDLER:
+ dlog_puts("Mouse set event handler");
+ data.event_mask = r.x.cx;
+ data.event_handler = MK_FP(r.x.es, r.x.dx);
+ break;
+ case INT33_SET_MOUSE_SPEED:
+ dlog_print("Mouse set speed x=");
+ dlog_printd(r.x.cx);
+ dlog_print(" y=");
+ dlog_printd(r.x.dx);
+ dlog_endline();
+ data.mickeysPerLine.x = r.x.cx;
+ data.mickeysPerLine.y = r.x.dx;
+ break;
+ case INT33_SET_SPEED_DOUBLE_THRESHOLD:
+ dlog_print("Mouse set speed double threshold=");
+ dlog_printd(r.x.dx);
+ dlog_endline();
+ data.doubleSpeedThreshold = r.x.dx;
+ break;
+ case INT33_EXCHANGE_EVENT_HANDLER:
+ dlog_puts("Mouse exchange event handler");
+ data.event_mask = r.x.cx;
+ {
+ void (__far *prev_event_handler)() = data.event_handler;
+ data.event_handler = MK_FP(r.x.es, r.x.dx);
+ r.x.es = FP_SEG(prev_event_handler);
+ r.x.dx = FP_OFF(prev_event_handler);
+ }
+ break;
+ case INT33_GET_MOUSE_STATUS_SIZE:
+ dlog_puts("Mouse get status size");
+ r.x.bx = sizeof(TSRDATA);
+ break;
+ case INT33_SAVE_MOUSE_STATUS:
+ dlog_puts("Mouse save status");
+ _fmemcpy(MK_FP(r.x.es, r.x.dx), &data, sizeof(TSRDATA));
+ break;
+ case INT33_LOAD_MOUSE_STATUS:
+ dlog_puts("Mouse load status");
+ _fmemcpy(&data, MK_FP(r.x.es, r.x.dx), sizeof(TSRDATA));
+ break;
+ case INT33_SET_MOUSE_SENSITIVITY:
+ dlog_print("Mouse set speed x=");
+ dlog_printd(r.x.bx);
+ dlog_print(" y=");
+ dlog_printd(r.x.cx);
+ dlog_print(" threshold=");
+ dlog_printd(r.x.dx);
+ dlog_endline();
+ data.mickeysPerLine.x = r.x.bx;
+ data.mickeysPerLine.y = r.x.cx;
+ data.doubleSpeedThreshold = r.x.dx;
+ break;
+ case INT33_GET_MOUSE_SENSITIVITY:
+ r.x.bx = data.mickeysPerLine.x;
+ r.x.cx = data.mickeysPerLine.y;
+ r.x.dx = data.doubleSpeedThreshold;
+ break;
+ case INT33_RESET_SETTINGS:
+ dlog_puts("Mouse reset settings");
+ reload_video_info();
+ reset_mouse_settings();
+ reset_mouse_state();
+ r.x.ax = INT33_MOUSE_FOUND;
+ r.x.bx = NUM_BUTTONS;
+ break;
+ case INT33_GET_LANGUAGE:
+ r.x.bx = 0;
+ break;
+ case INT33_GET_DRIVER_INFO:
+ dlog_puts("Mouse get driver info");
+ r.h.bh = REPORTED_VERSION_MAJOR;
+ r.h.bl = REPORTED_VERSION_MINOR;
+ r.h.ch = INT33_MOUSE_TYPE_PS2;
+ r.h.cl = 0;
+ break;
+ case INT33_GET_MAX_COORDINATES:
+ r.x.bx = 0;
+ r.x.cx = MAX(data.screen_max.x, data.max.x);
+ r.x.dx = MAX(data.screen_max.y, data.max.y);
+ break;
+ case INT33_GET_WINDOW:
+ r.x.ax = data.min.x;
+ r.x.bx = data.min.y;
+ r.x.cx = data.max.x;
+ r.x.dx = data.max.y;
+ break;
+#if USE_WHEEL
+ // Wheel API extensions:
+ case INT33_GET_CAPABILITIES:
+ dlog_puts("Mouse get capabitilies");
+ r.x.ax = INT33_WHEEL_API_MAGIC; // Driver supports wheel API
+ r.x.bx = 0;
+ r.x.cx = data.haswheel ? INT33_CAPABILITY_MOUSE_API : 0;
+ data.usewheelapi = true; // Someone calling this function likely wants to use wheel API
+ break;
+#endif
+ // Our internal API extensions:
+ case INT33_GET_TSR_DATA:
+ dlog_puts("Get TSR data");
+ r.x.es = FP_SEG(&data);
+ r.x.di = FP_OFF(&data);
+ break;
+ default:
+ dlog_print("Unknown mouse function ax=");
+ dlog_printx(r.x.ax);
+ dlog_endline();
+ break;
+ }
+}
+
+// Can't use __interrupt, it makes a call to GETDS on the runtime
+void __declspec(naked) __far int33_isr(void)
+{
+ __asm {
+ pusha
+ push ds
+ push es
+ push fs
+ push gs
+
+ mov bp, sp
+ push cs
+ pop ds
+
+ call int33_handler
+
+ pop gs
+ pop fs
+ pop es
+ pop ds
+ popa
+ iret
+ }
+}
+
+#if USE_WIN386
+/** Windows will call this function to notify events when we are inside a DOS box. */
+static void windows_mouse_handler(int action, int x, int y, int buttons, int events)
+#pragma aux windows_mouse_handler "*" parm [ax] [bx] [cx] [dx] [si] modify [ax bx cx dx es]
+{
+ switch (action) {
+ case VMD_ACTION_MOUSE_EVENT:
+ (void) events;
+ // Forward event to our internal system
+ handle_mouse_event(buttons, true, x, y, 0);
+ break;
+ case VMD_ACTION_HIDE_CURSOR:
+ dlog_puts("VMD_ACTION_HIDE_CURSOR");
+ data.w386cursor = true;
+ refresh_cursor();
+ break;
+ case VMD_ACTION_SHOW_CURSOR:
+ dlog_puts("VMD_ACTION_SHOW_CURSOR");
+ data.w386cursor = false;
+ refresh_cursor();
+ break;
+ }
+}
+
+void __declspec(naked) __far windows_mouse_callback()
+{
+ __asm {
+ pusha
+ push ds
+ push es
+ push fs
+ push gs
+
+ mov bp, sp
+ push cs
+ pop ds
+
+ call windows_mouse_handler
+
+ pop gs
+ pop fs
+ pop es
+ pop ds
+ popa
+
+ retf
+ }
+}
+
+static void int2f_handler(union INTPACK r)
+#pragma aux int2f_handler "*" parm caller [] modify [ax bx cx dx es]
+{
+ switch (r.x.ax) {
+ case INT2F_NOTIFY_WIN386_STARTUP:
+ dlog_print("Windows is starting, version=");
+ dlog_printx(r.x.di);
+ dlog_endline();
+ data.w386_startup.version = 3;
+ data.w386_startup.next = MK_FP(r.x.es, r.x.bx);
+ data.w386_startup.device_driver = 0;
+ data.w386_startup.device_driver_data = 0;
+ data.w386_startup.instance_data = &data.w386_instance;
+ data.w386_instance[0].ptr = &data;
+ data.w386_instance[0].size = sizeof(data);
+ data.w386_instance[1].ptr = 0;
+ data.w386_instance[1].size = 0;
+ r.x.es = FP_SEG(&data.w386_startup);
+ r.x.bx = FP_OFF(&data.w386_startup);
+ break;
+ case INT2F_NOTIFY_DEVICE_CALLOUT:
+ switch (r.x.bx) {
+ case VMD_DEVICE_ID:
+ switch (r.x.cx) {
+ case VMD_CALLOUT_TEST:
+ r.x.cx = 1; // Yes, we are here!
+ break;
+ case VMD_CALLOUT_GET_DOS_MOUSE_API:
+ // Windows is asking our mouse driver for the hook function address
+ r.x.ds = get_cs();
+ r.x.si = FP_OFF(windows_mouse_callback);
+ r.x.ax = 0; // Yes, we are here!
+ break;
+ }
+ break;
+ }
+ break;
+ }
+}
+
+void __declspec(naked) __far int2f_isr(void)
+{
+ __asm {
+ pusha
+ push ds
+ push es
+ push fs
+ push gs
+
+ mov bp, sp
+ push cs
+ pop ds
+
+ call int2f_handler
+
+ pop gs
+ pop fs
+ pop es
+ pop ds
+ popa
+
+ ; Jump to the next handler in the chain
+ jmp dword ptr cs:[data + 4] ; wasm doesn't support structs, this is data.prev_int2f_handler
+ }
+}
+#endif
+
+static LPTSRDATA int33_get_tsr_data(void);
+#pragma aux int33_get_tsr_data = \
+ "xor ax, ax" \
+ "mov es, ax" \
+ "mov di, ax" \
+ "mov ax, 0x73" \
+ "int 0x33" \
+ __value [es di] \
+ __modify [ax]
+
+static LPTSRDATA local_get_tsr_data(void);
+#pragma aux local_get_tsr_data = \
+ "mov ax, cs" \
+ "mov es, ax" \
+ "mov di, offset data" \
+ __value [es di] \
+ __modify [ax]
+
+LPTSRDATA __far get_tsr_data(bool installed)
+{
+ if (installed) {
+ return int33_get_tsr_data();
+ } else {
+ return local_get_tsr_data();
+ }
+}
+
+int resident_end;