karina
94 lines
3.5 KiB
C
94 lines
3.5 KiB
C
#include <Arch/DTB.h>
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#include <OS/Panic.h>
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#include <OS/Log.h>
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#include <Lib/Bytes.h>
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#include <Lib/Align.h>
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#include <Lib/String.h>
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#include <VM/PMM.h>
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void DTBParse(Pointer dtb, VMBootMemoryMap* bootMap) {
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FDTHeader* header = (FDTHeader*)dtb;
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if (BytesSwap32(header->magic) != kFDTHeaderMagic) {
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OSPanic("Invalid DTB magic");
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}
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UInt32 offStruct = BytesSwap32(header->offDtStruct);
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UInt32 offStrings = BytesSwap32(header->offDtStrings);
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BytePointer structs = (BytePointer)dtb + offStruct;
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ASCII* strings = (ASCII*)dtb + offStrings;
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ASCII* currentNode = "";
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UInt32 currentDepth = 0;
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UInt32 reservedMemoryDepth = 0;
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bool inReservedMemory = false;
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while (true) {
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UInt32 token = BytesSwap32(*(UInt32*)structs);
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structs += 4;
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switch (token) {
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case FDTTokenBeginNode: {
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currentDepth++;
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currentNode = (ASCII*)structs;
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if (StringStartsWith(currentNode, "reserved-memory")) {
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inReservedMemory = true;
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reservedMemoryDepth = currentDepth;
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}
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UInt32 nameLength = StringGetLength(currentNode);
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structs += (nameLength + 1);
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structs = (BytePointer)AlignUp64((Address)structs, 4);
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break;
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}
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case FDTTokenProperty: {
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UInt32 propertyLength = BytesSwap32(*(UInt32*)structs);
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UInt32 nameOffset = BytesSwap32(*(UInt32*)(structs + 4));
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structs += 8;
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ASCII* propertyName = strings + nameOffset;
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if (StringCompare(propertyName, "reg") == 0) {
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if (StringStartsWith(currentNode, "memory")) {
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UInt32* cells = (UInt32*)structs;
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UInt64 base = Merge32To64(BytesSwap32(cells[1]), BytesSwap32(cells[0]));
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UInt64 size = Merge32To64(BytesSwap32(cells[3]), BytesSwap32(cells[2]));
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OSLog("Main Memory: base=0x%x, size=0x%x\n", base, size);
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bootMap->totalRAM.base = base;
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bootMap->totalRAM.size = size;
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}
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else if (inReservedMemory && currentDepth > reservedMemoryDepth) {
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UInt32* cells = (UInt32*)structs;
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UInt64 base = Merge32To64(BytesSwap32(cells[1]), BytesSwap32(cells[0]));
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UInt64 size = Merge32To64(BytesSwap32(cells[3]), BytesSwap32(cells[2]));
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UInt32 index = bootMap->reservedCount;
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bootMap->reserved[index].base = base;
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bootMap->reserved[index].size = size;
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bootMap->reservedCount++;
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OSLog("Reserved Region (%s): base=0x%x, size=0x%x\n", currentNode, base, size);
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}
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}
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structs += propertyLength;
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structs = (BytePointer)AlignUp64((Address)structs, 4);
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break;
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}
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case FDTTokenEndNode: {
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if (inReservedMemory && currentDepth == reservedMemoryDepth) {
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inReservedMemory = false;
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}
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currentDepth--;
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break;
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}
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case FDTTokenNOP: continue;
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case FDTTokenEnd: return;
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default:
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OSPanic("Invalid DTB token");
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}
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}
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} |