71 lines
2.7 KiB
C
71 lines
2.7 KiB
C
// hal_pci.c - PCI configuration space via Mechanism 1 port I/O
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#include <stdint.h>
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#include <hal_api.h>
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#define PCI_CONFIG_ADDR 0xCF8
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#define PCI_CONFIG_DATA 0xCFC
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static uint32_t MakeAddr(uint8_t bus, uint8_t dev, uint8_t fn, uint8_t reg) {
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return 0x80000000UL
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| ((uint32_t)bus << 16)
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| ((uint32_t)(dev & 0x1F) << 11)
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| ((uint32_t)(fn & 0x07) << 8)
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| (reg & 0xFC);
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}
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static uint32_t PciRead32(uint8_t bus, uint8_t dev, uint8_t fn, uint8_t reg) {
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__outdword(PCI_CONFIG_ADDR, MakeAddr(bus, dev, fn, reg));
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return __indword(PCI_CONFIG_DATA);
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}
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static void PciWrite32(uint8_t bus, uint8_t dev, uint8_t fn,
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uint8_t reg, uint32_t val) {
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__outdword(PCI_CONFIG_ADDR, MakeAddr(bus, dev, fn, reg));
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__outdword(PCI_CONFIG_DATA, val);
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}
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static bool PciFindDevice(uint16_t vendor, uint16_t device,
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uint8_t* outBus, uint8_t* outDev, uint8_t* outFn) {
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for (int bus = 0; bus < 256; bus++)
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for (int dev = 0; dev < 32; dev++)
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for (int fn = 0; fn < 8; fn++) {
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uint32_t id = PciRead32((uint8_t)bus, (uint8_t)dev, (uint8_t)fn, 0);
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if ((id & 0xFFFF) == vendor && (id >> 16) == device) {
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*outBus = (uint8_t)bus; *outDev = (uint8_t)dev; *outFn = (uint8_t)fn;
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return true;
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}
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}
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return false;
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}
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static bool PciFindClass(uint8_t classCode, uint8_t subclass,
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uint8_t* outBus, uint8_t* outDev, uint8_t* outFn) {
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for (int bus = 0; bus < 256; bus++)
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for (int dev = 0; dev < 32; dev++)
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for (int fn = 0; fn < 8; fn++) {
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uint32_t id = PciRead32((uint8_t)bus,(uint8_t)dev,(uint8_t)fn,0);
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if ((id & 0xFFFF) == 0xFFFF) continue; // no device
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uint32_t cc = PciRead32((uint8_t)bus,(uint8_t)dev,(uint8_t)fn,8);
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if (((cc >> 24) & 0xFF) == classCode &&
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((cc >> 16) & 0xFF) == subclass) {
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*outBus = (uint8_t)bus; *outDev = (uint8_t)dev; *outFn = (uint8_t)fn;
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return true;
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}
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}
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return false;
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}
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static uint8_t PciGetIrqLine(uint8_t bus, uint8_t dev, uint8_t fn) {
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// PCI config register 0x3C: byte 0 = IRQ line, byte 1 = IRQ pin
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uint32_t val = PciRead32(bus, dev, fn, 0x3C);
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return (uint8_t)(val & 0xFF); // 0xFF = not connected
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}
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void HalPciInitialize(HAL_PCI* out) {
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out->Read32 = PciRead32;
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out->Write32 = PciWrite32;
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out->FindDevice = PciFindDevice;
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out->FindClass = PciFindClass;
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out->GetIrqLine = PciGetIrqLine;
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}
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