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Kernel: Unallocate RSDT after we are done with it

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Bananymous
2023-01-12 13:45:01 +02:00
parent 087d14fbb7
commit 301ad89783
3 changed files with 34 additions and 3 deletions
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27
kernel/arch/i386/MMU.cpp
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@@ -96,3 +96,30 @@ void MMU::AllocateRange(uintptr_t address, ptrdiff_t size)
for (uintptr_t page = s_page; page <= e_page; page += PAGE_SIZE)
AllocatePage(page);
}
void MMU::UnAllocatePage(uintptr_t address)
{
uint32_t pdpte = (address & 0xC0000000) >> 30;
uint32_t pde = (address & 0x3FE00000) >> 21;
uint32_t pte = (address & 0x001FF000) >> 12;
uint64_t* page_directory = (uint64_t*)(m_page_descriptor_pointer_table[pdpte] & PAGE_MASK);
ASSERT(page_directory[pde] & PRESENT);
uint64_t* page_table = (uint64_t*)(page_directory[pde] & PAGE_MASK);
ASSERT(page_table[pte] & PRESENT);
page_table[pte] = 0;
// TODO: Unallocate the page table if this was the only allocated page
asm volatile("invlpg (%0)" :: "r"(address & PAGE_MASK) : "memory");
}
void MMU::UnAllocateRange(uintptr_t address, ptrdiff_t size)
{
uintptr_t s_page = address & PAGE_MASK;
uintptr_t e_page = (address + size - 1) & PAGE_MASK;
for (uintptr_t page = s_page; page <= e_page; page += PAGE_SIZE)
UnAllocatePage(page);
}