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/*
* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Atomic.h>
#include <AK/Checked.h>
#include <Kernel/Bus/PCI/Access.h>
#include <Kernel/Bus/PCI/IDs.h>
#include <Kernel/Debug.h>
#include <Kernel/Graphics/Bochs/GraphicsAdapter.h>
#include <Kernel/Graphics/Console/ContiguousFramebufferConsole.h>
#include <Kernel/Graphics/GraphicsManagement.h>
#include <Kernel/IO.h>
#include <Kernel/Sections.h>
#include <Kernel/VM/TypedMapping.h>
#define VBE_DISPI_IOPORT_INDEX 0x01CE
#define VBE_DISPI_IOPORT_DATA 0x01CF
#define VBE_DISPI_INDEX_ID 0x0
#define VBE_DISPI_INDEX_XRES 0x1
#define VBE_DISPI_INDEX_YRES 0x2
#define VBE_DISPI_INDEX_BPP 0x3
#define VBE_DISPI_INDEX_ENABLE 0x4
#define VBE_DISPI_INDEX_BANK 0x5
#define VBE_DISPI_INDEX_VIRT_WIDTH 0x6
#define VBE_DISPI_INDEX_VIRT_HEIGHT 0x7
#define VBE_DISPI_INDEX_X_OFFSET 0x8
#define VBE_DISPI_INDEX_Y_OFFSET 0x9
#define VBE_DISPI_DISABLED 0x00
#define VBE_DISPI_ENABLED 0x01
#define VBE_DISPI_LFB_ENABLED 0x40
namespace Kernel {
struct [[gnu::packed]] DISPIInterface {
u16 index_id;
u16 xres;
u16 yres;
u16 bpp;
u16 enable;
u16 bank;
u16 virt_width;
u16 virt_height;
u16 x_offset;
u16 y_offset;
};
struct [[gnu::packed]] BochsDisplayMMIORegisters {
u8 edid_data[0x400];
u16 vga_ioports[0x10];
u8 reserved[0xE0];
DISPIInterface bochs_regs;
};
UNMAP_AFTER_INIT NonnullRefPtr<BochsGraphicsAdapter> BochsGraphicsAdapter::initialize(PCI::Address address)
{
PCI::ID id = PCI::get_id(address);
VERIFY((id.vendor_id == PCI::VendorID::QEMUOld && id.device_id == 0x1111) || (id.vendor_id == PCI::VendorID::VirtualBox && id.device_id == 0xbeef));
return adopt_ref(*new BochsGraphicsAdapter(address));
}
UNMAP_AFTER_INIT BochsGraphicsAdapter::BochsGraphicsAdapter(PCI::Address pci_address)
: PCI::DeviceController(pci_address)
, m_mmio_registers(PCI::get_BAR2(pci_address) & 0xfffffff0)
, m_registers(map_typed_writable<BochsDisplayMMIORegisters volatile>(m_mmio_registers))
{
// We assume safe resolutio is 1024x768x32
m_framebuffer_console = Graphics::ContiguousFramebufferConsole::initialize(PhysicalAddress(PCI::get_BAR0(pci_address) & 0xfffffff0), 1024, 768, 1024 * sizeof(u32));
// FIXME: This is a very wrong way to do this...
GraphicsManagement::the().m_console = m_framebuffer_console;
// Note: If we use VirtualBox graphics adapter (which is based on Bochs one), we need to use IO ports
auto id = PCI::get_id(pci_address);
if (id.vendor_id == 0x80ee && id.device_id == 0xbeef)
m_io_required = true;
// Note: According to Gerd Hoffmann - "The linux driver simply does
// the unblank unconditionally. With bochs-display this is not needed but
// it also has no bad side effect".
unblank();
set_safe_resolution();
}
UNMAP_AFTER_INIT void BochsGraphicsAdapter::initialize_framebuffer_devices()
{
// FIXME: Find a better way to determine default resolution...
m_framebuffer_device = FramebufferDevice::create(*this, 0, PhysicalAddress(PCI::get_BAR0(pci_address()) & 0xfffffff0), 1024, 768, 1024 * sizeof(u32));
m_framebuffer_device->initialize();
}
GraphicsDevice::Type BochsGraphicsAdapter::type() const
{
if (PCI::get_class(pci_address()) == 0x3 && PCI::get_subclass(pci_address()) == 0x0)
return Type::VGACompatible;
return Type::Bochs;
}
void BochsGraphicsAdapter::unblank()
{
full_memory_barrier();
m_registers->vga_ioports[0] = 0x20;
full_memory_barrier();
}
void BochsGraphicsAdapter::set_safe_resolution()
{
VERIFY(m_framebuffer_console);
auto result = try_to_set_resolution(0, 1024, 768);
VERIFY(result);
}
static void set_register_with_io(u16 index, u16 data)
{
IO::out16(VBE_DISPI_IOPORT_INDEX, index);
IO::out16(VBE_DISPI_IOPORT_DATA, data);
}
static u16 get_register_with_io(u16 index)
{
IO::out16(VBE_DISPI_IOPORT_INDEX, index);
return IO::in16(VBE_DISPI_IOPORT_DATA);
}
void BochsGraphicsAdapter::set_resolution_registers_via_io(size_t width, size_t height)
{
dbgln_if(BXVGA_DEBUG, "BochsGraphicsAdapter resolution registers set to - {}x{}", width, height);
set_register_with_io(VBE_DISPI_INDEX_ENABLE, VBE_DISPI_DISABLED);
set_register_with_io(VBE_DISPI_INDEX_XRES, (u16)width);
set_register_with_io(VBE_DISPI_INDEX_YRES, (u16)height);
set_register_with_io(VBE_DISPI_INDEX_VIRT_WIDTH, (u16)width);
set_register_with_io(VBE_DISPI_INDEX_VIRT_HEIGHT, (u16)height * 2);
set_register_with_io(VBE_DISPI_INDEX_BPP, 32);
set_register_with_io(VBE_DISPI_INDEX_ENABLE, VBE_DISPI_ENABLED | VBE_DISPI_LFB_ENABLED);
set_register_with_io(VBE_DISPI_INDEX_BANK, 0);
}
void BochsGraphicsAdapter::set_resolution_registers(size_t width, size_t height)
{
dbgln_if(BXVGA_DEBUG, "BochsGraphicsAdapter resolution registers set to - {}x{}", width, height);
m_registers->bochs_regs.enable = VBE_DISPI_DISABLED;
full_memory_barrier();
m_registers->bochs_regs.xres = width;
m_registers->bochs_regs.yres = height;
m_registers->bochs_regs.virt_width = width;
m_registers->bochs_regs.virt_height = height * 2;
m_registers->bochs_regs.bpp = 32;
full_memory_barrier();
m_registers->bochs_regs.enable = VBE_DISPI_ENABLED | VBE_DISPI_LFB_ENABLED;
full_memory_barrier();
m_registers->bochs_regs.bank = 0;
}
bool BochsGraphicsAdapter::try_to_set_resolution(size_t output_port_index, size_t width, size_t height)
{
// Note: There's only one output port for this adapter
VERIFY(output_port_index == 0);
VERIFY(m_framebuffer_console);
if (Checked<size_t>::multiplication_would_overflow(width, height, sizeof(u32)))
return false;
if (m_io_required)
set_resolution_registers_via_io(width, height);
else
set_resolution_registers(width, height);
dbgln_if(BXVGA_DEBUG, "BochsGraphicsAdapter resolution test - {}x{}", width, height);
if (m_io_required) {
if (!validate_setup_resolution_with_io(width, height))
return false;
} else {
if (!validate_setup_resolution(width, height))
return false;
}
dbgln("BochsGraphicsAdapter: resolution set to {}x{}", width, height);
m_framebuffer_console->set_resolution(width, height, width * sizeof(u32));
return true;
}
bool BochsGraphicsAdapter::validate_setup_resolution_with_io(size_t width, size_t height)
{
if ((u16)width != get_register_with_io(VBE_DISPI_INDEX_XRES) || (u16)height != get_register_with_io(VBE_DISPI_INDEX_YRES)) {
return false;
}
return true;
}
bool BochsGraphicsAdapter::validate_setup_resolution(size_t width, size_t height)
{
if ((u16)width != m_registers->bochs_regs.xres || (u16)height != m_registers->bochs_regs.yres) {
return false;
}
return true;
}
bool BochsGraphicsAdapter::set_y_offset(size_t output_port_index, size_t y_offset)
{
VERIFY(output_port_index == 0);
if (m_console_enabled)
return false;
m_registers->bochs_regs.y_offset = y_offset;
return true;
}
void BochsGraphicsAdapter::enable_consoles()
{
ScopedSpinLock lock(m_console_mode_switch_lock);
VERIFY(m_framebuffer_console);
m_console_enabled = true;
m_registers->bochs_regs.y_offset = 0;
if (m_framebuffer_device)
m_framebuffer_device->deactivate_writes();
m_framebuffer_console->enable();
}
void BochsGraphicsAdapter::disable_consoles()
{
ScopedSpinLock lock(m_console_mode_switch_lock);
VERIFY(m_framebuffer_console);
VERIFY(m_framebuffer_device);
m_console_enabled = false;
m_registers->bochs_regs.y_offset = 0;
m_framebuffer_console->disable();
m_framebuffer_device->activate_writes();
}
}
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