mirror of
https://github.com/RGBCube/serenity
synced 2025-05-30 23:28:12 +00:00
731fc5a7c8
Instead of cowboy-calling the VESA BIOS in the bootloader, find the emulator VGA adapter by scanning the PCI bus. Then set up the desired video mode by sending device commands.
68 lines
2.2 KiB
C++
68 lines
2.2 KiB
C++
#include <Kernel/BochsVGADevice.h>
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#include <Kernel/IO.h>
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#include <Kernel/PCI.h>
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#define VBE_DISPI_IOPORT_INDEX 0x01CE
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#define VBE_DISPI_IOPORT_DATA 0x01CF
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#define VBE_DISPI_INDEX_ID 0x0
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#define VBE_DISPI_INDEX_XRES 0x1
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#define VBE_DISPI_INDEX_YRES 0x2
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#define VBE_DISPI_INDEX_BPP 0x3
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#define VBE_DISPI_INDEX_ENABLE 0x4
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#define VBE_DISPI_INDEX_BANK 0x5
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#define VBE_DISPI_INDEX_VIRT_WIDTH 0x6
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#define VBE_DISPI_INDEX_VIRT_HEIGHT 0x7
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#define VBE_DISPI_DISABLED 0x00
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#define VBE_DISPI_ENABLED 0x01
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#define VBE_DISPI_LFB_ENABLED 0x40
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static BochsVGADevice* s_the;
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BochsVGADevice& BochsVGADevice::the()
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{
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return *s_the;
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}
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void BochsVGADevice::initialize_statics()
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{
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s_the = nullptr;
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}
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BochsVGADevice::BochsVGADevice()
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{
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s_the = this;
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m_framebuffer_address = PhysicalAddress(find_framebuffer_address());
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}
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void BochsVGADevice::set_register(word index, word data)
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{
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IO::out16(VBE_DISPI_IOPORT_INDEX, index);
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IO::out16(VBE_DISPI_IOPORT_DATA, data);
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}
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void BochsVGADevice::set_resolution(int width, int height)
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{
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set_register(VBE_DISPI_INDEX_ENABLE, VBE_DISPI_DISABLED);
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set_register(VBE_DISPI_INDEX_XRES, width);
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set_register(VBE_DISPI_INDEX_YRES, height);
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set_register(VBE_DISPI_INDEX_VIRT_WIDTH, width);
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set_register(VBE_DISPI_INDEX_VIRT_HEIGHT, height);
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set_register(VBE_DISPI_INDEX_BPP, 32);
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set_register(VBE_DISPI_INDEX_ENABLE, VBE_DISPI_ENABLED | VBE_DISPI_LFB_ENABLED);
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set_register(VBE_DISPI_INDEX_BANK, 0);
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}
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dword BochsVGADevice::find_framebuffer_address()
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{
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static const PCI::ID bochs_vga_id = { 0x1234, 0x1111 };
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static const PCI::ID virtualbox_vga_id = { 0x80ee, 0xbeef };
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dword framebuffer_address = 0;
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PCI::enumerate_all([&framebuffer_address] (const PCI::Address& address, PCI::ID id) {
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if (id == bochs_vga_id || id == virtualbox_vga_id) {
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framebuffer_address = PCI::get_BAR0(address) & 0xfffffff0;
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kprintf("BochsVGA framebuffer @ PCI %w:%w BAR0=%x\n", id.vendor_id, id.device_id, framebuffer_address);
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}
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});
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return framebuffer_address;
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}
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