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/*
* Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/Assertions.h>
#include <AK/String.h>
#include <Kernel/Arch/i386/CPU.h>
#include <Kernel/Devices/VMWareBackdoor.h>
#include <LibBareMetal/IO.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 VMWARE_MAGIC 0x564D5868
#define VMWARE_PORT 0x5658
#define VMWARE_PORT_HIGHBANDWIDTH 0x5659
//#define VMWAREBACKDOOR_DEBUG
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));
}
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()
{
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;
}
bool VMWareBackdoor::supported()
{
return m_supported;
}
bool VMWareBackdoor::detect_vmmouse()
{
if (!supported())
return false;
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()
{
return m_vmmouse_absolute;
}
void VMWareBackdoor::enable_absolute_vmmouse()
{
InterruptDisabler disabler;
if (!supported() || !detect_vmmouse())
return;
dbg() << "Enabling vmmouse, absolute mode";
VMWareCommand command;
command.bx = 0;
command.command = VMMOUSE_STATUS;
send(command);
if (command.ax == 0xFFFF0000) {
klog() << "VMMouse retuned 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;
if (!supported())
return;
VMWareCommand command;
command.bx = VMMOUSE_REQUEST_RELATIVE;
command.command = VMMOUSE_COMMAND;
send(command);
m_vmmouse_absolute = false;
}
void VMWareBackdoor::send_high_bandwidth(VMWareCommand& command)
{
if (supported()) {
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);
#endif
}
}
void VMWareBackdoor::get_high_bandwidth(VMWareCommand& command)
{
if (supported()) {
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);
#endif
}
}
void VMWareBackdoor::send(VMWareCommand& command)
{
if (supported()) {
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);
#endif
}
}
}
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