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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.
121 lines
4.5 KiB
C++
121 lines
4.5 KiB
C++
#include <Kernel/PCI.h>
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#include <Kernel/IO.h>
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#define PCI_VENDOR_ID 0x00 // word
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#define PCI_DEVICE_ID 0x02 // word
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#define PCI_COMMAND 0x04 // word
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#define PCI_STATUS 0x06 // word
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#define PCI_REVISION_ID 0x08 // byte
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#define PCI_PROG_IF 0x09 // byte
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#define PCI_SUBCLASS 0x0a // byte
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#define PCI_CLASS 0x0b // byte
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#define PCI_CACHE_LINE_SIZE 0x0c // byte
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#define PCI_LATENCY_TIMER 0x0d // byte
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#define PCI_HEADER_TYPE 0x0e // byte
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#define PCI_BIST 0x0f // byte
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#define PCI_BAR0 0x10 // dword
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#define PCI_BAR1 0x14 // dword
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#define PCI_BAR2 0x18 // dword
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#define PCI_BAR3 0x1C // dword
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#define PCI_BAR4 0x20 // dword
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#define PCI_BAR5 0x24 // dword
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#define PCI_INTERRUPT_LINE 0x3C // byte
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#define PCI_SECONDARY_BUS 0x19 // byte
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#define PCI_HEADER_TYPE_DEVICE 0
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#define PCI_HEADER_TYPE_BRIDGE 1
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#define PCI_TYPE_BRIDGE 0x0604
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#define PCI_ADDRESS_PORT 0xCF8
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#define PCI_VALUE_PORT 0xCFC
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#define PCI_NONE 0xFFFF
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namespace PCI {
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template<typename T>
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T read_field(Address address, dword field)
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{
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IO::out32(PCI_ADDRESS_PORT, address.io_address_for_field(field));
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if constexpr (sizeof(T) == 4)
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return IO::in32(PCI_VALUE_PORT);
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if constexpr (sizeof(T) == 2)
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return IO::in16(PCI_VALUE_PORT + (field & 2));
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if constexpr (sizeof(T) == 1)
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return IO::in8(PCI_VALUE_PORT + (field & 3));
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}
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template<typename T>
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void write_field(Address address, dword field, T value)
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{
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IO::out32(PCI_ADDRESS_PORT, address.io_address_for_field(field));
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if constexpr (sizeof(T) == 4)
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IO::out32(PCI_VALUE_PORT, value);
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if constexpr (sizeof(T) == 2)
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IO::out16(PCI_VALUE_PORT + (field & 2), value);
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if constexpr (sizeof(T) == 1)
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IO::out8(PCI_VALUE_PORT + (field & 3), value);
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}
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word read_type(Address address)
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{
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return (read_field<byte>(address, PCI_CLASS) << 8u) | read_field<byte>(address, PCI_SUBCLASS);
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}
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void enumerate_bus(int type, byte bus, Function<void(Address, ID)>&);
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void enumerate_functions(int type, byte bus, byte slot, byte function, Function<void(Address, ID)>& callback)
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{
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Address address(bus, slot, function);
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if (type == -1 || type == read_type(address))
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callback(address, { read_field<word>(address, PCI_VENDOR_ID), read_field<word>(address, PCI_DEVICE_ID) });
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if (read_type(address) == PCI_TYPE_BRIDGE) {
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byte secondary_bus = read_field<byte>(address, PCI_SECONDARY_BUS);
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kprintf("PCI: Found secondary bus: %u\n", secondary_bus);
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ASSERT(secondary_bus != bus);
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enumerate_bus(type, secondary_bus, callback);
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}
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}
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void enumerate_slot(int type, byte bus, byte slot, Function<void(Address, ID)>& callback)
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{
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Address address(bus, slot, 0);
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if (read_field<word>(address, PCI_VENDOR_ID) == PCI_NONE)
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return;
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enumerate_functions(type, bus, slot, 0, callback);
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if (!(read_field<byte>(address, PCI_HEADER_TYPE) & 0x80))
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return;
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for (byte function = 1; function < 8; ++function) {
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Address address(bus, slot, function);
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if (read_field<word>(address, PCI_VENDOR_ID) != PCI_NONE)
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enumerate_functions(type, bus, slot, function, callback);
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}
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}
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void enumerate_bus(int type, byte bus, Function<void(Address, ID)>& callback)
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{
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for (byte slot = 0; slot < 32; ++slot)
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enumerate_slot(type, bus, slot, callback);
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}
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dword get_BAR0(Address address) { return read_field<dword>(address, PCI_BAR0); }
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dword get_BAR1(Address address) { return read_field<dword>(address, PCI_BAR1); }
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dword get_BAR2(Address address) { return read_field<dword>(address, PCI_BAR2); }
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dword get_BAR3(Address address) { return read_field<dword>(address, PCI_BAR3); }
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dword get_BAR4(Address address) { return read_field<dword>(address, PCI_BAR4); }
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dword get_BAR5(Address address) { return read_field<dword>(address, PCI_BAR5); }
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void enumerate_all(Function<void(Address, ID)> callback)
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{
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// Single PCI host controller.
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if ((read_field<byte>(Address(), PCI_HEADER_TYPE) & 0x80) == 0) {
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enumerate_bus(-1, 0, callback);
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return;
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}
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// Multiple PCI host controllers.
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for (byte function = 0; function < 8; ++function) {
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if (read_field<word>(Address(0, 0, function), PCI_VENDOR_ID) == PCI_NONE)
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break;
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enumerate_bus(-1, function, callback);
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}
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}
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}
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