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https://github.com/RGBCube/serenity
synced 2025-07-26 21:27:34 +00:00
Kernel: Simplify VMWareBackdoor somewhat
- If there is no VMWare backdoor, don't allocate memory for it. - Remove the "unsupported" state, instead just don't instantiate. - Move the command-line parsing from init to the driver. - Move mouse packet reception from PS2MouseDevice to VMWareBackdoor.
This commit is contained in:
Andreas Kling
parent
bb2be4bb99
commit
5cc09b0245
7 changed files with 113 additions and 144 deletions
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@ -27,7 +27,9 @@
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#include <AK/Assertions.h>
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#include <AK/String.h>
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#include <Kernel/Arch/i386/CPU.h>
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#include <Kernel/CommandLine.h>
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#include <Kernel/Devices/VMWareBackdoor.h>
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#include <Kernel/MousePacket.h>
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#include <LibBareMetal/IO.h>
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namespace Kernel {
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@ -40,6 +42,9 @@ namespace Kernel {
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#define VMMOUSE_REQUEST_ABSOLUTE 0x53424152
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#define VMMOUSE_QEMU_VERSION 0x3442554a
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#define VMMOUSE_LEFT_CLICK 0x20
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#define VMMOUSE_RIGHT_CLICK 0x10
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#define VMMOUSE_MIDDLE_CLICK 0x08
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#define VMWARE_MAGIC 0x564D5868
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#define VMWARE_PORT 0x5658
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@ -77,34 +82,7 @@ inline void vmware_high_bandwidth_get(VMWareCommand& command)
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static VMWareBackdoor* s_vmware_backdoor;
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static bool is_initialized()
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{
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return s_vmware_backdoor != nullptr;
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}
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void VMWareBackdoor::initialize()
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{
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if (!is_initialized())
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s_vmware_backdoor = new VMWareBackdoor;
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}
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VMWareBackdoor& VMWareBackdoor::the()
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{
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ASSERT(s_vmware_backdoor != nullptr);
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return *s_vmware_backdoor;
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}
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VMWareBackdoor::VMWareBackdoor()
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{
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if (!detect_presence()) {
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klog() << "VMWare Backdoor: Not supported!";
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m_supported = false;
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return;
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}
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klog() << "VMWare Backdoor: Supported.";
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m_supported = true;
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}
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bool VMWareBackdoor::detect_presence()
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static bool detect_presence()
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{
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VMWareCommand command;
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command.bx = ~VMWARE_MAGIC;
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@ -115,15 +93,29 @@ bool VMWareBackdoor::detect_presence()
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return true;
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}
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bool VMWareBackdoor::supported()
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VMWareBackdoor* VMWareBackdoor::initialize()
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{
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return m_supported;
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if (!detect_presence())
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return nullptr;
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s_vmware_backdoor = new VMWareBackdoor;
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klog() << "VMWare backdoor opened.";
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return s_vmware_backdoor;
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}
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VMWareBackdoor* VMWareBackdoor::the()
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{
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return s_vmware_backdoor;
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}
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VMWareBackdoor::VMWareBackdoor()
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{
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if (kernel_command_line().lookup("vmmouse").value_or("on") == "on")
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enable_absolute_vmmouse();
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}
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bool VMWareBackdoor::detect_vmmouse()
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{
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if (!supported())
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return false;
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VMWareCommand command;
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command.bx = VMMOUSE_READ_ID;
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command.command = VMMOUSE_COMMAND;
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@ -135,7 +127,7 @@ bool VMWareBackdoor::detect_vmmouse()
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return false;
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return true;
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}
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bool VMWareBackdoor::vmmouse_is_absolute()
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bool VMWareBackdoor::vmmouse_is_absolute() const
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{
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return m_vmmouse_absolute;
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}
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@ -143,9 +135,9 @@ bool VMWareBackdoor::vmmouse_is_absolute()
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void VMWareBackdoor::enable_absolute_vmmouse()
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{
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InterruptDisabler disabler;
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if (!supported() || !detect_vmmouse())
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if (!detect_vmmouse())
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return;
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dbg() << "Enabling vmmouse, absolute mode";
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klog() << "VMWareBackdoor: Enabling absolute mouse mode";
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VMWareCommand command;
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@ -153,7 +145,7 @@ void VMWareBackdoor::enable_absolute_vmmouse()
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command.command = VMMOUSE_STATUS;
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send(command);
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if (command.ax == 0xFFFF0000) {
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klog() << "VMMouse retuned bad status.";
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klog() << "VMWareBackdoor: VMMOUSE_STATUS got bad status";
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return;
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}
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@ -166,8 +158,6 @@ void VMWareBackdoor::enable_absolute_vmmouse()
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void VMWareBackdoor::disable_absolute_vmmouse()
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{
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InterruptDisabler disabler;
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if (!supported())
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return;
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VMWareCommand command;
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command.bx = VMMOUSE_REQUEST_RELATIVE;
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command.command = VMMOUSE_COMMAND;
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@ -177,32 +167,72 @@ void VMWareBackdoor::disable_absolute_vmmouse()
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void VMWareBackdoor::send_high_bandwidth(VMWareCommand& command)
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{
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if (supported()) {
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vmware_high_bandwidth_send(command);
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vmware_high_bandwidth_send(command);
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#ifdef VMWAREBACKDOOR_DEBUG
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dbg() << "VMWareBackdoor Command High bandwidth Send Results: EAX " << String::format("%x", command.ax) << " EBX " << String::format("%x", command.bx) << " ECX " << String::format("%x", command.cx) << " EDX " << String::format("%x", command.dx);
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dbg() << "VMWareBackdoor Command High bandwidth Send Results: EAX " << String::format("%x", command.ax) << " EBX " << String::format("%x", command.bx) << " ECX " << String::format("%x", command.cx) << " EDX " << String::format("%x", command.dx);
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#endif
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}
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}
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void VMWareBackdoor::get_high_bandwidth(VMWareCommand& command)
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{
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if (supported()) {
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vmware_high_bandwidth_get(command);
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vmware_high_bandwidth_get(command);
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#ifdef VMWAREBACKDOOR_DEBUG
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dbg() << "VMWareBackdoor Command High bandwidth Get Results: EAX " << String::format("%x", command.ax) << " EBX " << String::format("%x", command.bx) << " ECX " << String::format("%x", command.cx) << " EDX " << String::format("%x", command.dx);
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dbg() << "VMWareBackdoor Command High bandwidth Get Results: EAX " << String::format("%x", command.ax) << " EBX " << String::format("%x", command.bx) << " ECX " << String::format("%x", command.cx) << " EDX " << String::format("%x", command.dx);
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#endif
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}
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}
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void VMWareBackdoor::send(VMWareCommand& command)
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{
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if (supported()) {
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vmware_out(command);
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vmware_out(command);
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#ifdef VMWAREBACKDOOR_DEBUG
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dbg() << "VMWareBackdoor Command Send Results: EAX " << String::format("%x", command.ax) << " EBX " << String::format("%x", command.bx) << " ECX " << String::format("%x", command.cx) << " EDX " << String::format("%x", command.dx);
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dbg() << "VMWareBackdoor Command Send Results: EAX " << String::format("%x", command.ax) << " EBX " << String::format("%x", command.bx) << " ECX " << String::format("%x", command.cx) << " EDX " << String::format("%x", command.dx);
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#endif
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}
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Optional<MousePacket> VMWareBackdoor::receive_mouse_packet()
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{
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VMWareCommand command;
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command.bx = 0;
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command.command = VMMOUSE_STATUS;
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send(command);
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if (command.ax == 0xFFFF0000) {
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#ifdef PS2MOUSE_DEBUG
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klog() << "PS2MouseDevice: Resetting VMWare mouse";
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#endif
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disable_absolute_vmmouse();
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enable_absolute_vmmouse();
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return {};
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}
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int words = command.ax & 0xFFFF;
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if (!words || words % 4)
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return {};
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command.size = 4;
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command.command = VMMOUSE_DATA;
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send(command);
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int buttons = (command.ax & 0xFFFF);
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int x = (command.bx);
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int y = (command.cx);
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int z = (command.dx);
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#ifdef PS2MOUSE_DEBUG
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dbg() << "Absolute Mouse: Buttons " << String::format("%x", buttons);
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dbg() << "Mouse: X " << x << ", Y " << y << ", Z " << z;
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#endif
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MousePacket packet;
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packet.x = x;
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packet.y = y;
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packet.z = z;
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if (buttons & VMMOUSE_LEFT_CLICK)
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packet.buttons |= MousePacket::LeftButton;
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if (buttons & VMMOUSE_RIGHT_CLICK)
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packet.buttons |= MousePacket::RightButton;
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if (buttons & VMMOUSE_MIDDLE_CLICK)
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packet.buttons |= MousePacket::MiddleButton;
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packet.is_relative = false;
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return packet;
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}
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}
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