[FREELDR] Add PCI BIOS emulation and PCI bus enumeration for Xbox (#1830)

CORE-16216 CORE-16308

boot/freeldr/freeldr/arch/i386/hwpci.c

@@ -24,6 +24,8 @@
 
 DBG_DEFAULT_CHANNEL(HWDETECT);
 
+FIND_PCI_BIOS FindPciBios = NULL;
+
 static
 PPCI_IRQ_ROUTING_TABLE
 GetPciIrqRoutingTable(VOID)
@@ -75,8 +77,8 @@ GetPciIrqRoutingTable(VOID)
 }
 
 
-static BOOLEAN
-FindPciBios(PPCI_REGISTRY_INFO BusData)
+BOOLEAN
+PcFindPciBios(PPCI_REGISTRY_INFO BusData)
 {
     REGS  RegsIn;
     REGS  RegsOut;

boot/freeldr/freeldr/arch/i386/machpc.c

@@ -1353,6 +1353,7 @@ PcHwDetect(VOID)
     // TODO: Discover and set the machine type as the Component->Identifier
 
     GetHarddiskConfigurationData = PcGetHarddiskConfigurationData;
+    FindPciBios = PcFindPciBios;
 
     /* Detect buses */
     DetectPciBios(SystemKey, &BusNumber);

boot/freeldr/freeldr/arch/i386/machxbox.c

@@ -23,6 +23,18 @@
 DBG_DEFAULT_CHANNEL(HWDETECT);
 
 
+BOOLEAN
+XboxFindPciBios(PPCI_REGISTRY_INFO BusData)
+{
+    /* We emulate PCI BIOS here, there are 2 known working PCI buses on an original Xbox */
+
+    BusData->NoBuses = 2;
+    BusData->MajorRevision = 1;
+    BusData->MinorRevision = 0;
+    BusData->HardwareMechanism = 1;
+    return TRUE;
+}
+
 VOID
 XboxGetExtendedBIOSData(PULONG ExtendedBIOSDataArea, PULONG ExtendedBIOSDataSize)
 {
@@ -175,8 +187,10 @@ XboxHwDetect(VOID)
     FldrCreateSystemKey(&SystemKey);
 
     GetHarddiskConfigurationData = XboxGetHarddiskConfigurationData;
+    FindPciBios = XboxFindPciBios;
 
     /* TODO: Build actual xbox's hardware configuration tree */
+    DetectPciBios(SystemKey, &BusNumber);
     DetectIsaBios(SystemKey, &BusNumber);
 
     TRACE("DetectHardware() Done\n");

boot/freeldr/freeldr/include/arch/pc/hardware.h

@@ -38,6 +38,12 @@ PCM_PARTIAL_RESOURCE_LIST
 
 extern GET_HARDDISK_CONFIG_DATA GetHarddiskConfigurationData;
 
+typedef
+BOOLEAN
+(*FIND_PCI_BIOS)(PPCI_REGISTRY_INFO BusData);
+
+extern FIND_PCI_BIOS FindPciBios;
+
 VOID
 DetectBiosDisks(PCONFIGURATION_COMPONENT_DATA SystemKey,
                 PCONFIGURATION_COMPONENT_DATA BusKey);

boot/freeldr/freeldr/include/arch/pc/machpc.h

@@ -49,6 +49,7 @@ VOID PcVideoPrepareForReactOS(VOID);
 VOID PcPrepareForReactOS(VOID);
 
 PFREELDR_MEMORY_DESCRIPTOR PcMemGetMemoryMap(ULONG *MemoryMapSize);
+BOOLEAN PcFindPciBios(PPCI_REGISTRY_INFO BusData);
 
 BOOLEAN DiskResetController(UCHAR DriveNumber);
 BOOLEAN DiskGetExtendedDriveParameters(UCHAR DriveNumber, PVOID Buffer, USHORT BufferSize);