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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 2020-04-08 16:35:00 +02:00
parent bb2be4bb99
commit 5cc09b0245
7 changed files with 113 additions and 144 deletions

View file

@ -27,7 +27,9 @@
#include <AK/Assertions.h>
#include <AK/String.h>
#include <Kernel/Arch/i386/CPU.h>
#include <Kernel/CommandLine.h>
#include <Kernel/Devices/VMWareBackdoor.h>
#include <Kernel/MousePacket.h>
#include <LibBareMetal/IO.h>
namespace Kernel {
@ -40,6 +42,9 @@ namespace Kernel {
#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
@ -77,34 +82,7 @@ inline void vmware_high_bandwidth_get(VMWareCommand& command)
static VMWareBackdoor* s_vmware_backdoor;
static bool is_initialized()
{
return s_vmware_backdoor != nullptr;
}
void VMWareBackdoor::initialize()
{
if (!is_initialized())
s_vmware_backdoor = new VMWareBackdoor;
}
VMWareBackdoor& VMWareBackdoor::the()
{
ASSERT(s_vmware_backdoor != nullptr);
return *s_vmware_backdoor;
}
VMWareBackdoor::VMWareBackdoor()
{
if (!detect_presence()) {
klog() << "VMWare Backdoor: Not supported!";
m_supported = false;
return;
}
klog() << "VMWare Backdoor: Supported.";
m_supported = true;
}
bool VMWareBackdoor::detect_presence()
static bool detect_presence()
{
VMWareCommand command;
command.bx = ~VMWARE_MAGIC;
@ -115,15 +93,29 @@ bool VMWareBackdoor::detect_presence()
return true;
}
bool VMWareBackdoor::supported()
VMWareBackdoor* VMWareBackdoor::initialize()
{
return m_supported;
if (!detect_presence())
return nullptr;
s_vmware_backdoor = new VMWareBackdoor;
klog() << "VMWare backdoor opened.";
return s_vmware_backdoor;
}
VMWareBackdoor* VMWareBackdoor::the()
{
return s_vmware_backdoor;
}
VMWareBackdoor::VMWareBackdoor()
{
if (kernel_command_line().lookup("vmmouse").value_or("on") == "on")
enable_absolute_vmmouse();
}
bool VMWareBackdoor::detect_vmmouse()
{
if (!supported())
return false;
VMWareCommand command;
command.bx = VMMOUSE_READ_ID;
command.command = VMMOUSE_COMMAND;
@ -135,7 +127,7 @@ bool VMWareBackdoor::detect_vmmouse()
return false;
return true;
}
bool VMWareBackdoor::vmmouse_is_absolute()
bool VMWareBackdoor::vmmouse_is_absolute() const
{
return m_vmmouse_absolute;
}
@ -143,9 +135,9 @@ bool VMWareBackdoor::vmmouse_is_absolute()
void VMWareBackdoor::enable_absolute_vmmouse()
{
InterruptDisabler disabler;
if (!supported() || !detect_vmmouse())
if (!detect_vmmouse())
return;
dbg() << "Enabling vmmouse, absolute mode";
klog() << "VMWareBackdoor: Enabling absolute mouse mode";
VMWareCommand command;
@ -153,7 +145,7 @@ void VMWareBackdoor::enable_absolute_vmmouse()
command.command = VMMOUSE_STATUS;
send(command);
if (command.ax == 0xFFFF0000) {
klog() << "VMMouse retuned bad status.";
klog() << "VMWareBackdoor: VMMOUSE_STATUS got bad status";
return;
}
@ -166,8 +158,6 @@ void VMWareBackdoor::enable_absolute_vmmouse()
void VMWareBackdoor::disable_absolute_vmmouse()
{
InterruptDisabler disabler;
if (!supported())
return;
VMWareCommand command;
command.bx = VMMOUSE_REQUEST_RELATIVE;
command.command = VMMOUSE_COMMAND;
@ -177,32 +167,72 @@ void VMWareBackdoor::disable_absolute_vmmouse()
void VMWareBackdoor::send_high_bandwidth(VMWareCommand& command)
{
if (supported()) {
vmware_high_bandwidth_send(command);
vmware_high_bandwidth_send(command);
#ifdef VMWAREBACKDOOR_DEBUG
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);
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);
#endif
}
}
void VMWareBackdoor::get_high_bandwidth(VMWareCommand& command)
{
if (supported()) {
vmware_high_bandwidth_get(command);
vmware_high_bandwidth_get(command);
#ifdef VMWAREBACKDOOR_DEBUG
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);
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);
#endif
}
}
void VMWareBackdoor::send(VMWareCommand& command)
{
if (supported()) {
vmware_out(command);
vmware_out(command);
#ifdef VMWAREBACKDOOR_DEBUG
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);
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);
#endif
}
Optional<MousePacket> VMWareBackdoor::receive_mouse_packet()
{
VMWareCommand command;
command.bx = 0;
command.command = VMMOUSE_STATUS;
send(command);
if (command.ax == 0xFFFF0000) {
#ifdef PS2MOUSE_DEBUG
klog() << "PS2MouseDevice: Resetting VMWare mouse";
#endif
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 = (command.dx);
#ifdef PS2MOUSE_DEBUG
dbg() << "Absolute Mouse: Buttons " << String::format("%x", buttons);
dbg() << "Mouse: X " << x << ", Y " << y << ", Z " << z;
#endif
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;
}
}