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smouse.go
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smouse.go
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/*
Copyright (c) 2019-2021 Andreas T Jonsson
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
package smouse
import (
"bytes"
"flag"
"github.com/andreas-jonsson/virtualxt/emulator/processor"
"github.com/andreas-jonsson/virtualxt/platform"
)
const (
maxBufferSize = 16
maxNumEvents = 128
)
type mouseEvent struct {
buttons byte
xrel, yrel int8
}
type Device struct {
BasePort uint16
IRQ int
registers [8]byte
events chan mouseEvent
buffer bytes.Buffer
pic processor.InterruptController
}
func (m *Device) Install(p processor.Processor) error {
if !enabled {
return nil
}
m.pic = p.GetInterruptController()
m.events = make(chan mouseEvent, maxNumEvents)
platform.Instance.SetMouseHandler(m.eventHandler)
return p.InstallIODevice(m, m.BasePort, m.BasePort+7)
}
func (m *Device) Name() string {
return "Microsoft Serial Mouse"
}
func (m *Device) Reset() {
m.buffer.Reset()
for i := range m.registers {
m.registers[i] = 0
}
}
func (m *Device) Step(int) error {
for {
select {
case ev := <-m.events:
var upper byte
if ev.xrel < 0 {
upper = 0x3
}
if ev.yrel < 0 {
upper |= 0xC
}
m.pushData(0x40 | ((ev.buttons & 3) << 4) | upper)
m.pushData(byte(ev.xrel & 0x3F))
m.pushData(byte(ev.yrel & 0x3F))
default:
return nil
}
}
}
func (m *Device) pushData(data byte) {
ln := m.buffer.Len()
if ln == maxBufferSize {
return
}
if ln == 0 {
m.pic.IRQ(m.IRQ)
}
m.buffer.WriteByte(data)
}
func (m *Device) eventHandler(buttons byte, xrel, yrel int8) {
select {
case m.events <- mouseEvent{buttons, xrel, yrel}:
default:
}
}
func (m *Device) In(port uint16) byte {
reg := port & 7
switch reg {
case 0: // Serial Data Register
data, err := m.buffer.ReadByte()
if err != nil {
data = 0
}
if m.buffer.Len() > 0 {
m.pic.IRQ(m.IRQ)
}
return data
case 5: // Line Status Register
if m.buffer.Len() > 0 {
return 0x61
}
return 0x60
}
return m.registers[reg]
}
func (m *Device) Out(port uint16, data byte) {
reg := port & 7
rval := m.registers[reg]
m.registers[reg] = data
if reg == 4 { // Modem Control Register
if data&1 != rval&1 {
m.buffer.Reset()
m.pushData('M')
}
}
}
var enabled = true
func init() {
flag.BoolVar(&enabled, "mouse", enabled, "Enable mouse support")
}