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Kernel: rename MMU::m_page_directory_pointer_table -> m_highest_paging_stuct 

This might not always be pdpt. In x86_64 it is pml4/pml5
This commit is contained in:
Bananymous 2023-01-22 03:03:01 +02:00
parent 6ec4ba3dc9
commit cdd27ae3db
2 changed files with 9 additions and 9 deletions
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16
kernel/arch/i386/MMU.cpp
View File

@ -39,19 +39,19 @@ static uint64_t* allocate_page_aligned_page()
MMU::MMU()
{
m_page_descriptor_pointer_table = (uint64_t*)kmalloc(sizeof(uint64_t) * 4, 32);
ASSERT(m_page_descriptor_pointer_table);
ASSERT(((uintptr_t)m_page_descriptor_pointer_table % 32) == 0);
m_highest_paging_struct = (uint64_t*)kmalloc(sizeof(uint64_t) * 4, 32);
ASSERT(m_highest_paging_struct);
ASSERT(((uintptr_t)m_highest_paging_struct % 32) == 0);
// allocate all page directories
for (int i = 0; i < 4; i++)
{
uint64_t* page_directory = allocate_page_aligned_page();
m_page_descriptor_pointer_table[i] = (uint64_t)page_directory | PRESENT;
m_highest_paging_struct[i] = (uint64_t)page_directory | PRESENT;
}
// create and identity map first 4 MiB
uint64_t* page_directory1 = (uint64_t*)(m_page_descriptor_pointer_table[0] & PAGE_MASK);
uint64_t* page_directory1 = (uint64_t*)(m_highest_paging_struct[0] & PAGE_MASK);
for (uint64_t i = 0; i < 2; i++)
{
uint64_t* page_table = allocate_page_aligned_page();
@ -67,7 +67,7 @@ MMU::MMU()
page_table1[0] = 0;
// reload this new pdpt
asm volatile("movl %0, %%cr3" :: "r"(m_page_descriptor_pointer_table));
asm volatile("movl %0, %%cr3" :: "r"(m_highest_paging_struct));
}
void MMU::AllocatePage(uintptr_t address)
@ -80,7 +80,7 @@ void MMU::AllocatePage(uintptr_t address)
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);
uint64_t* page_directory = (uint64_t*)(m_highest_paging_struct[pdpte] & PAGE_MASK);
if (!(page_directory[pde] & PRESENT))
{
uint64_t* page_table = allocate_page_aligned_page();
@ -111,7 +111,7 @@ void MMU::UnAllocatePage(uintptr_t address)
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);
uint64_t* page_directory = (uint64_t*)(m_highest_paging_struct[pdpte] & PAGE_MASK);
ASSERT(page_directory[pde] & PRESENT);
uint64_t* page_table = (uint64_t*)(page_directory[pde] & PAGE_MASK);

2
kernel/include/kernel/MMU.h
View File

@ -19,5 +19,5 @@ private:
MMU();
private:
uint64_t* m_page_descriptor_pointer_table;
uint64_t* m_highest_paging_struct;
};