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256 lines
7.2 KiB
C++
256 lines
7.2 KiB
C++
/*
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* Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/Assertions.h>
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#include <AK/OwnPtr.h>
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#include <AK/Singleton.h>
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#include <AK/String.h>
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#include <Kernel/API/MousePacket.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/Debug.h>
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#include <Kernel/Devices/VMWareBackdoor.h>
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#include <Kernel/IO.h>
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namespace Kernel {
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#define VMWARE_CMD_GETVERSION 0x0a
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#define VMMOUSE_READ_ID 0x45414552
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#define VMMOUSE_DISABLE 0x000000f5
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#define VMMOUSE_REQUEST_RELATIVE 0x4c455252
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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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#define VMWARE_PORT_HIGHBANDWIDTH 0x5659
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inline void vmware_out(VMWareCommand& command)
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{
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command.magic = VMWARE_MAGIC;
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command.port = VMWARE_PORT;
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command.si = 0;
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command.di = 0;
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asm volatile("in %%dx, %0"
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: "+a"(command.ax), "+b"(command.bx), "+c"(command.cx), "+d"(command.dx), "+S"(command.si), "+D"(command.di));
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}
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inline void vmware_high_bandwidth_send(VMWareCommand& command)
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{
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command.magic = VMWARE_MAGIC;
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command.port = VMWARE_PORT_HIGHBANDWIDTH;
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asm volatile("cld; rep; outsb"
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: "+a"(command.ax), "+b"(command.bx), "+c"(command.cx), "+d"(command.dx), "+S"(command.si), "+D"(command.di));
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}
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inline void vmware_high_bandwidth_get(VMWareCommand& command)
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{
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command.magic = VMWARE_MAGIC;
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command.port = VMWARE_PORT_HIGHBANDWIDTH;
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asm volatile("cld; rep; insb"
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: "+a"(command.ax), "+b"(command.bx), "+c"(command.cx), "+d"(command.dx), "+S"(command.si), "+D"(command.di));
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}
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class VMWareBackdoorDetector {
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public:
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VMWareBackdoorDetector()
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{
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if (detect_presence())
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m_backdoor = make<VMWareBackdoor>();
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}
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VMWareBackdoor* get_instance()
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{
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return m_backdoor.ptr();
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}
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private:
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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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command.command = VMWARE_CMD_GETVERSION;
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vmware_out(command);
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if (command.bx != VMWARE_MAGIC || command.ax == 0xFFFFFFFF)
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return false;
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return true;
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}
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OwnPtr<VMWareBackdoor> m_backdoor;
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};
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static AK::Singleton<VMWareBackdoorDetector> s_vmware_backdoor;
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VMWareBackdoor* VMWareBackdoor::the()
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{
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return s_vmware_backdoor->get_instance();
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}
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UNMAP_AFTER_INIT 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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VMWareCommand command;
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command.bx = VMMOUSE_READ_ID;
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command.command = VMMOUSE_COMMAND;
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send(command);
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command.bx = 1;
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command.command = VMMOUSE_DATA;
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send(command);
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if (command.ax != VMMOUSE_QEMU_VERSION)
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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() const
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{
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return m_vmmouse_absolute;
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}
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void VMWareBackdoor::enable_absolute_vmmouse()
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{
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InterruptDisabler disabler;
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if (!detect_vmmouse())
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return;
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klog() << "VMWareBackdoor: Enabling absolute mouse mode";
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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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klog() << "VMWareBackdoor: VMMOUSE_STATUS got bad status";
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return;
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}
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// Enable absolute vmmouse
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command.bx = VMMOUSE_REQUEST_ABSOLUTE;
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command.command = VMMOUSE_COMMAND;
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send(command);
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m_vmmouse_absolute = true;
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}
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void VMWareBackdoor::disable_absolute_vmmouse()
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{
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InterruptDisabler disabler;
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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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send(command);
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m_vmmouse_absolute = false;
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}
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void VMWareBackdoor::send_high_bandwidth(VMWareCommand& command)
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{
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vmware_high_bandwidth_send(command);
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dbgln_if(VMWARE_BACKDOOR_DEBUG, "VMWareBackdoor Command High bandwidth Send Results: EAX {:#x} EBX {:#x} ECX {:#x} EDX {:#x}",
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command.ax,
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command.bx,
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command.cx,
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command.dx);
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}
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void VMWareBackdoor::get_high_bandwidth(VMWareCommand& command)
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{
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vmware_high_bandwidth_get(command);
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dbgln_if(VMWARE_BACKDOOR_DEBUG, "VMWareBackdoor Command High bandwidth Get Results: EAX {:#x} EBX {:#x} ECX {:#x} EDX {:#x}",
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command.ax,
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command.bx,
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command.cx,
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command.dx);
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}
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void VMWareBackdoor::send(VMWareCommand& command)
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{
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vmware_out(command);
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dbgln_if(VMWARE_BACKDOOR_DEBUG, "VMWareBackdoor Command Send Results: EAX {:#x} EBX {:#x} ECX {:#x} EDX {:#x}",
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command.ax,
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command.bx,
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command.cx,
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command.dx);
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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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#if 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 = (i8)(command.dx); // signed 8 bit value only!
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if constexpr (PS2MOUSE_DEBUG) {
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dbgln("Absolute Mouse: Buttons {:x}", buttons);
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dbgln("Mouse: x={}, y={}, z={}", x, y, z);
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}
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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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