get MCFG table

kernel/Makefile

@@ -61,4 +61,4 @@ buildimg:
 	mcopy -i $(BUILDDIR)/$(OSNAME).img $(BUILDDIR)/zap-light18.psf ::
 
 run:
-	qemu-system-x86_64 -drive file=$(BUILDDIR)/$(OSNAME).img -m 256M -cpu qemu64 -drive if=pflash,format=raw,unit=0,file="$(OVMFDIR)/OVMF_CODE-pure-efi.fd",readonly=on -drive if=pflash,format=raw,unit=1,file="$(OVMFDIR)/OVMF_VARS-pure-efi.fd" -net none
+	qemu-system-x86_64 -machine q35 -drive file=$(BUILDDIR)/$(OSNAME).img -m 256M -cpu qemu64 -drive if=pflash,format=raw,unit=0,file="$(OVMFDIR)/OVMF_CODE-pure-efi.fd",readonly=on -drive if=pflash,format=raw,unit=1,file="$(OVMFDIR)/OVMF_VARS-pure-efi.fd" -net none

kernel/src/acpi.cpp

@@ -0,0 +1,20 @@
+#include "acpi.h"
+
+namespace ACPI {
+	void* FindTable(SDTHeader* sdtHeader, char* signature) {
+		int entries = (sdtHeader->Length - sizeof(ACPI::SDTHeader)) / 8;
+
+		for (int t = 0; t < entries; t++) {
+			ACPI::SDTHeader* newSDTHeader = (ACPI::SDTHeader*)*(uint64_t*)((uint64_t)sdtHeader + sizeof(ACPI::SDTHeader) + (t * 8));
+			for (int i = 0; i < 4; i++) {
+				if (newSDTHeader->Signature[i] != signature[i]) {
+					break;
+				}
+
+				if (i == 3) return newSDTHeader;
+			} 
+		}
+
+		return 0;
+	}
+};

kernel/src/acpi.h

@@ -30,4 +30,6 @@ namespace ACPI {
 		SDTHeader Header;
 		uint64_t Reserved;
 	}__attribute__((packed));
+
+	void* FindTable(SDTHeader* sdtHeader, char* signature);
 };

kernel/src/kernel.cpp

@@ -4,9 +4,6 @@ extern "C" void _start(BootInfo* bootInfo) {
 	KernelInfo kernelInfo = InitializeKernel(bootInfo);
 	PageTableManager* pageTableManager = kernelInfo.pageTableManager;
 	
-	GlobalRenderer->Print(to_hstring((uint64_t)bootInfo->rsdp));
-	GlobalRenderer->Next();
-	
 	while (true) {
 		ProcessMousePacket();
 	}

kernel/src/kernelUtil.cpp

@@ -13,9 +13,8 @@ extern "C" void __stack_chk_fail(void) {
 KernelInfo kernelInfo;
 PageTableManager pageTableManager = NULL;
 void PrepareMemory(BootInfo* bootInfo){
-	GlobalRenderer->Print("    - Locking kernel pages...");
+	GlobalRenderer->Print("Preparing memory...");
 	GlobalRenderer->Next();
-
     uint64_t mMapEntries = bootInfo->mMapSize / bootInfo->mMapDescriptorSize;
 
     GlobalAllocator = PageFrameAllocator();
@@ -26,7 +25,7 @@ void PrepareMemory(BootInfo* bootInfo){
 
     GlobalAllocator.LockPages(&_KernelStart, kernelPages);
 
-	GlobalRenderer->Print("    - Setting up page table manager...");
+	/*GlobalRenderer->Print("    - Setting up page table manager...");
 	GlobalRenderer->Next();
 
     PageTable* PML4 = (PageTable*)GlobalAllocator.RequestPage();
@@ -47,7 +46,7 @@ void PrepareMemory(BootInfo* bootInfo){
 
     asm ("mov %0, %%cr3" : : "r" (PML4));
 
-    kernelInfo.pageTableManager = &pageTableManager;
+    kernelInfo.pageTableManager = &pageTableManager;*/
 }
 
 IDTR idtr;
@@ -62,6 +61,11 @@ void SetIDTGate(void* handler, uint8_t entryOffset, uint8_t type_attr, uint8_t s
 void PrepareACPI(BootInfo* bootInfo) {
 	ACPI::SDTHeader* xsdt = (ACPI::SDTHeader*)(bootInfo->rsdp->XSDTAddress);
 
+	ACPI::MCFGHeader* mcfg = (ACPI::MCFGHeader*)ACPI::FindTable(xsdt, (char*)"MCFG");
+
+	
+	GlobalRenderer->Print("All ACPI tables:");
+	GlobalRenderer->Next();
 	int entries = (xsdt->Length - sizeof(ACPI::SDTHeader)) / 8;
 	for (int t = 0; t < entries; t++) {
 		ACPI::SDTHeader* newSDTHeader = (ACPI::SDTHeader*)*(uint64_t*)((uint64_t)xsdt + sizeof(ACPI::SDTHeader) + (t * 8));
@@ -72,6 +76,11 @@ void PrepareACPI(BootInfo* bootInfo) {
 	}
 
 	GlobalRenderer->Next();
+
+	GlobalRenderer->Print("MCFG header location: 0x");
+	GlobalRenderer->Print(to_hstring((uint64_t)mcfg));
+	GlobalRenderer->Next();
+	GlobalRenderer->Next();
 }
 
 void PrepareInterrupts() {
@@ -109,9 +118,6 @@ KernelInfo InitializeKernel(BootInfo* bootInfo){
 	gdtDescriptor.Offset = (uint64_t)&DefaultGDT;
 	LoadGDT(&gdtDescriptor);
 
-	GlobalRenderer->Print("Preparing memory...");
-	GlobalRenderer->Next();
-
     PrepareMemory(bootInfo);
 
 	GlobalRenderer->Print("Setting up interrupts...");

kernel/src/pci.cpp

@@ -0,0 +1 @@
+#include "pci.h"

kernel/src/pci.h

@@ -0,0 +1 @@
+#pragma once