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Add support for multiboot2

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Alex
2023-05-10 21:50:11 +03:00
parent 79c6a5096d
commit f1dc3868ca
11 changed files with 343 additions and 97 deletions
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107
Core/Memory/PhysicalMemoryManager.cpp
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@ -377,63 +377,100 @@ namespace Memory
TotalMemory = MemorySize;
FreeMemory = MemorySize;
void *LargestFreeMemorySegment = nullptr;
uint64_t LargestFreeMemorySegmentSize = 0;
size_t BitmapSize = (MemorySize / PAGE_SIZE) / 8 + 1;
uintptr_t BitmapAddress = 0x0;
size_t BitmapAddressSize = 0;
uintptr_t KernelStart = (uintptr_t)bInfo.Kernel.PhysicalBase;
uintptr_t KernelEnd = (uintptr_t)bInfo.Kernel.PhysicalBase + bInfo.Kernel.Size;
for (uint64_t i = 0; i < bInfo.Memory.Entries; i++)
{
if (bInfo.Memory.Entry[i].Type == Usable)
{
if (bInfo.Memory.Entry[i].Length > LargestFreeMemorySegmentSize)
uintptr_t RegionAddress = (uintptr_t)bInfo.Memory.Entry[i].BaseAddress;
uintptr_t RegionSize = bInfo.Memory.Entry[i].Length;
/* We don't want to use 0 as a memory address. */
if (RegionAddress == 0x0)
continue;
if ((BitmapSize + 0x100) > RegionSize)
{
/* We don't want to use 0 as a memory address. */
if (bInfo.Memory.Entry[i].BaseAddress == 0x0)
continue;
LargestFreeMemorySegment = (void *)bInfo.Memory.Entry[i].BaseAddress;
LargestFreeMemorySegmentSize = bInfo.Memory.Entry[i].Length;
debug("Largest free memory segment: %llp (%lldMB)",
(void *)bInfo.Memory.Entry[i].BaseAddress,
TO_MB(bInfo.Memory.Entry[i].Length));
debug("Region %p-%p (%dMB) is too small for bitmap.",
(void *)RegionAddress,
(void *)(RegionAddress + RegionSize),
TO_MB(RegionSize));
continue;
}
BitmapAddress = RegionAddress;
BitmapAddressSize = RegionSize;
if (RegionAddress >= KernelStart && KernelEnd <= (RegionAddress + RegionSize))
{
BitmapAddress = KernelEnd;
BitmapAddressSize = RegionSize - (KernelEnd - RegionAddress);
}
if ((BitmapSize + 0x100) > BitmapAddressSize)
{
debug("Region %p-%p (%dMB) is too small for bitmap.",
(void *)RegionAddress,
(void *)(RegionAddress + BitmapAddressSize),
TO_MB(BitmapAddressSize));
continue;
}
for (size_t i = 0; i < MAX_MODULES; i++)
{
uintptr_t ModuleStart = (uintptr_t)bInfo.Modules[i].Address;
uintptr_t ModuleEnd = (uintptr_t)bInfo.Modules[i].Address + bInfo.Modules[i].Size;
if (ModuleStart == 0x0)
break;
if (RegionAddress >= ModuleStart && ModuleEnd <= (RegionAddress + RegionSize))
{
BitmapAddress = ModuleEnd;
BitmapAddressSize = RegionSize - (ModuleEnd - RegionAddress);
}
}
if ((BitmapSize + 0x100) > BitmapAddressSize)
{
debug("Region %p-%p (%dMB) is too small for bitmap.",
(void *)BitmapAddress,
(void *)(BitmapAddress + BitmapAddressSize),
TO_MB(BitmapAddressSize));
continue;
}
debug("Found free memory for bitmap: %p (%dMB)",
(void *)BitmapAddress,
TO_MB(BitmapAddressSize));
break;
}
}
if (LargestFreeMemorySegment == nullptr)
if (BitmapAddress == 0x0)
{
error("No free memory found!");
CPU::Stop();
}
/* TODO: Read swap config and make the configure the bitmap size correctly */
size_t BitmapSize = (MemorySize / PAGE_SIZE) / 8 + 1;
debug("Initializing Bitmap at %llp-%llp (%lld Bytes)",
LargestFreeMemorySegment,
(void *)((uintptr_t)LargestFreeMemorySegment + BitmapSize),
debug("Initializing Bitmap at %p-%p (%d Bytes)",
BitmapAddress,
(void *)(BitmapAddress + BitmapSize),
BitmapSize);
PageBitmap.Size = BitmapSize;
PageBitmap.Buffer = (uint8_t *)LargestFreeMemorySegment;
PageBitmap.Buffer = (uint8_t *)BitmapAddress;
for (size_t i = 0; i < BitmapSize; i++)
*(uint8_t *)(PageBitmap.Buffer + i) = 0;
debug("Reserving pages...");
this->ReservePages(0, TO_PAGES(bInfo.Memory.Size));
debug("Unreserving usable pages...");
for (uint64_t i = 0; i < bInfo.Memory.Entries; i++)
{
if (bInfo.Memory.Entry[i].Type == Usable)
this->UnreservePages(bInfo.Memory.Entry[i].BaseAddress, TO_PAGES(bInfo.Memory.Entry[i].Length));
}
debug("Reserving pages for SMP...");
this->ReservePage((void *)0x0); /* Trampoline stack, gdt, idt, etc... */
this->ReservePages((void *)0x2000, 4); /* TRAMPOLINE_START */
debug("Reserving bitmap pages...");
this->ReservePages(PageBitmap.Buffer, TO_PAGES(PageBitmap.Size));
ReserveEssentials();
}
Physical::Physical() {}