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/*
* Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/OwnPtr.h>
#include <AK/Singleton.h>
#include <Kernel/API/MousePacket.h>
#include <Kernel/Arch/x86/InterruptDisabler.h>
#include <Kernel/CommandLine.h>
#include <Kernel/Debug.h>
#include <Kernel/Devices/VMWareBackdoor.h>
#include <Kernel/Sections.h>
namespace Kernel {
#define VMWARE_CMD_GETVERSION 0x0a
#define VMMOUSE_READ_ID 0x45414552
#define VMMOUSE_DISABLE 0x000000f5
#define VMMOUSE_REQUEST_RELATIVE 0x4c455252
#define VMMOUSE_REQUEST_ABSOLUTE 0x53424152
#define VMMOUSE_QEMU_VERSION 0x3442554a
#define VMMOUSE_LEFT_CLICK 0x20
#define VMMOUSE_RIGHT_CLICK 0x10
#define VMMOUSE_MIDDLE_CLICK 0x08
#define VMWARE_MAGIC 0x564D5868
#define VMWARE_PORT 0x5658
#define VMWARE_PORT_HIGHBANDWIDTH 0x5659
inline void vmware_out(VMWareCommand& command)
{
command.magic = VMWARE_MAGIC;
command.port = VMWARE_PORT;
command.si = 0;
command.di = 0;
asm volatile("in %%dx, %0"
: "+a"(command.ax), "+b"(command.bx), "+c"(command.cx), "+d"(command.dx), "+S"(command.si), "+D"(command.di));
}
inline void vmware_high_bandwidth_send(VMWareCommand& command)
{
command.magic = VMWARE_MAGIC;
command.port = VMWARE_PORT_HIGHBANDWIDTH;
asm volatile("cld; rep; outsb"
: "+a"(command.ax), "+b"(command.bx), "+c"(command.cx), "+d"(command.dx), "+S"(command.si), "+D"(command.di));
}
inline void vmware_high_bandwidth_get(VMWareCommand& command)
{
command.magic = VMWARE_MAGIC;
command.port = VMWARE_PORT_HIGHBANDWIDTH;
asm volatile("cld; rep; insb"
: "+a"(command.ax), "+b"(command.bx), "+c"(command.cx), "+d"(command.dx), "+S"(command.si), "+D"(command.di));
}
class VMWareBackdoorDetector {
public:
VMWareBackdoorDetector()
{
if (detect_presence())
m_backdoor = make<VMWareBackdoor>();
}
VMWareBackdoor* get_instance()
{
return m_backdoor.ptr();
}
private:
static bool detect_presence()
{
VMWareCommand command;
command.bx = ~VMWARE_MAGIC;
command.command = VMWARE_CMD_GETVERSION;
vmware_out(command);
if (command.bx != VMWARE_MAGIC || command.ax == 0xFFFFFFFF)
return false;
return true;
}
OwnPtr<VMWareBackdoor> m_backdoor;
};
static Singleton<VMWareBackdoorDetector> s_vmware_backdoor;
VMWareBackdoor* VMWareBackdoor::the()
{
return s_vmware_backdoor->get_instance();
}
UNMAP_AFTER_INIT VMWareBackdoor::VMWareBackdoor()
{
if (kernel_command_line().is_vmmouse_enabled())
enable_absolute_vmmouse();
}
bool VMWareBackdoor::detect_vmmouse()
{
VMWareCommand command;
command.bx = VMMOUSE_READ_ID;
command.command = VMMOUSE_COMMAND;
send(command);
command.bx = 1;
command.command = VMMOUSE_DATA;
send(command);
if (command.ax != VMMOUSE_QEMU_VERSION)
return false;
return true;
}
bool VMWareBackdoor::vmmouse_is_absolute() const
{
return m_vmmouse_absolute;
}
void VMWareBackdoor::enable_absolute_vmmouse()
{
InterruptDisabler disabler;
if (!detect_vmmouse())
return;
dmesgln("VMWareBackdoor: Enabling absolute mouse mode");
VMWareCommand command;
command.bx = 0;
command.command = VMMOUSE_STATUS;
send(command);
if (command.ax == 0xFFFF0000) {
dmesgln("VMWareBackdoor: VMMOUSE_STATUS got bad status");
return;
}
// Enable absolute vmmouse
command.bx = VMMOUSE_REQUEST_ABSOLUTE;
command.command = VMMOUSE_COMMAND;
send(command);
m_vmmouse_absolute = true;
}
void VMWareBackdoor::disable_absolute_vmmouse()
{
InterruptDisabler disabler;
VMWareCommand command;
command.bx = VMMOUSE_REQUEST_RELATIVE;
command.command = VMMOUSE_COMMAND;
send(command);
m_vmmouse_absolute = false;
}
void VMWareBackdoor::send_high_bandwidth(VMWareCommand& command)
{
vmware_high_bandwidth_send(command);
dbgln_if(VMWARE_BACKDOOR_DEBUG, "VMWareBackdoor Command High bandwidth Send Results: EAX {:#x} EBX {:#x} ECX {:#x} EDX {:#x}",
command.ax,
command.bx,
command.cx,
command.dx);
}
void VMWareBackdoor::get_high_bandwidth(VMWareCommand& command)
{
vmware_high_bandwidth_get(command);
dbgln_if(VMWARE_BACKDOOR_DEBUG, "VMWareBackdoor Command High bandwidth Get Results: EAX {:#x} EBX {:#x} ECX {:#x} EDX {:#x}",
command.ax,
command.bx,
command.cx,
command.dx);
}
void VMWareBackdoor::send(VMWareCommand& command)
{
vmware_out(command);
dbgln_if(VMWARE_BACKDOOR_DEBUG, "VMWareBackdoor Command Send Results: EAX {:#x} EBX {:#x} ECX {:#x} EDX {:#x}",
command.ax,
command.bx,
command.cx,
command.dx);
}
Optional<MousePacket> VMWareBackdoor::receive_mouse_packet()
{
VMWareCommand command;
command.bx = 0;
command.command = VMMOUSE_STATUS;
send(command);
if (command.ax == 0xFFFF0000) {
dbgln_if(PS2MOUSE_DEBUG, "PS2MouseDevice: Resetting VMWare mouse");
disable_absolute_vmmouse();
enable_absolute_vmmouse();
return {};
}
int words = command.ax & 0xFFFF;
if (!words || words % 4)
return {};
command.size = 4;
command.command = VMMOUSE_DATA;
send(command);
int buttons = (command.ax & 0xFFFF);
int x = (command.bx);
int y = (command.cx);
int z = (i8)(command.dx); // signed 8 bit value only!
if constexpr (PS2MOUSE_DEBUG) {
dbgln("Absolute Mouse: Buttons {:x}", buttons);
dbgln("Mouse: x={}, y={}, z={}", x, y, z);
}
MousePacket packet;
packet.x = x;
packet.y = y;
packet.z = z;
if (buttons & VMMOUSE_LEFT_CLICK)
packet.buttons |= MousePacket::LeftButton;
if (buttons & VMMOUSE_RIGHT_CLICK)
packet.buttons |= MousePacket::RightButton;
if (buttons & VMMOUSE_MIDDLE_CLICK)
packet.buttons |= MousePacket::MiddleButton;
packet.is_relative = false;
return packet;
}
}
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