51 lines
1.6 KiB
C++
51 lines
1.6 KiB
C++
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// supposed to protect against stack smashing but we have no way to actually like
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// do anything when we detect it soooo...
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extern "C" void __stack_chk_fail(void) {
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return;
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}
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#include "kernelUtil.h"
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KernelInfo kernelInfo;
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PageTableManager pageTableManager = NULL;
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void PrepareMemory(BootInfo* bootInfo){
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uint64_t mMapEntries = bootInfo->mMapSize / bootInfo->mMapDescriptorSize;
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GlobalAllocator = PageFrameAllocator();
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GlobalAllocator.ReadEFIMemoryMap(bootInfo->mMap, bootInfo->mMapSize, bootInfo->mMapDescriptorSize);
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uint64_t kernelSize = (uint64_t)&_KernelEnd - (uint64_t)&_KernelStart;
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uint64_t kernelPages = (uint64_t)kernelSize / 4096 + 1;
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GlobalAllocator.LockPages(&_KernelStart, kernelPages);
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PageTable* PML4 = (PageTable*)GlobalAllocator.RequestPage();
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memset(PML4, 0, 0x1000);
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pageTableManager = PageTableManager(PML4);
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for (uint64_t t = 0; t < GetMemorySize(bootInfo->mMap, mMapEntries, bootInfo->mMapDescriptorSize); t+= 0x1000){
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pageTableManager.MapMemory((void*)t, (void*)t);
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}
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uint64_t fbBase = (uint64_t)bootInfo->framebuffer->BaseAddress;
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uint64_t fbSize = (uint64_t)bootInfo->framebuffer->BufferSize + 0x1000;
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GlobalAllocator.LockPages((void*)fbBase, fbSize/ 0x1000 + 1);
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for (uint64_t t = fbBase; t < fbBase + fbSize; t += 4096){
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pageTableManager.MapMemory((void*)t, (void*)t);
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}
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asm ("mov %0, %%cr3" : : "r" (PML4));
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kernelInfo.pageTableManager = &pageTableManager;
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}
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KernelInfo InitializeKernel(BootInfo* bootInfo){
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PrepareMemory(bootInfo);
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memset(bootInfo->framebuffer->BaseAddress, 0, bootInfo->framebuffer->BufferSize);
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return kernelInfo;
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}
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