49 lines
1.4 KiB
D
49 lines
1.4 KiB
D
module hulk.pci;
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import hulk.cpu;
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import hulk.klog;
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struct Pci
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{
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/* IO address for PCI configuration address. */
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enum IO_ADDR_CONFIG_ADDRESS = 0xCF8u;
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/* IO address for PCI configuration data. */
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enum IO_ADDR_CONFIG_DATA = 0xCFCu;
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private static ulong read_config_register(ulong bus_id, ulong device_id, ulong register_id)
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{
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ulong addr = 0x8000_0000u | (bus_id << 16u) | (device_id << 11u) | (register_id << 2u);
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out32(IO_ADDR_CONFIG_ADDRESS, addr);
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return in32(IO_ADDR_CONFIG_DATA);
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}
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private static void scan(ulong bus_id, ulong device_id)
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{
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ulong reg0 = read_config_register(bus_id, device_id, 0u);
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if (reg0 != 0xFFFFFFFFu)
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{
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ulong reg2 = read_config_register(bus_id, device_id, 2u);
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Klog.writefln("Found PCI device %04x:%04x (%02x:%02x:%02x) at %02u:%02u",
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(reg0 & 0xFFFFu), (reg0 >> 16u),
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(reg2 >> 24u) & 0xFFu,
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(reg2 >> 16u) & 0xFFu,
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(reg2 >> 8u) & 0xFFu,
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bus_id, device_id);
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}
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}
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public static void initialize()
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{
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Klog.writefln("Scanning PCI devices...");
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for (ulong bus_id = 0u; bus_id < 256u; bus_id++)
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{
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for (ulong device_id = 0u; device_id < 32u; device_id++)
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{
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scan(bus_id, device_id);
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}
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}
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Klog.writefln("PCI scan complete.");
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}
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}
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