drew/acadia
1
0
Fork 0
Code Issues 6 Pull requests Projects Releases Packages Wiki Activity Actions

[Zion] Free paging structures after process exit.

Browse source
This commit is contained in:
Drew Galbraith 2023-11-24 17:19:32 -08:00
parent 39ac0216dd
commit 46ae5de30a
5 changed files with 39 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

29
zion/memory/paging_util.cpp
View file

@ -87,6 +87,21 @@ uint64_t CurrCr3() {
return pml4_addr;
}
void CleanupPageStructure(uint64_t struct_phys, uint64_t level) {
uint64_t* struct_virtual =
reinterpret_cast<uint64_t*>(boot::GetHigherHalfDirectMap() + struct_phys);
if (level > 0) {
for (uint16_t i = 0; i < 256; i++) {
if (struct_virtual[i] & PRESENT_BIT) {
CleanupPageStructure(struct_virtual[i] & ~0xFFF, level - 1);
}
}
}
phys_mem::FreePage(struct_phys);
}
} // namespace
void InitializePml4(uint64_t pml4_physical_addr) {
@ -105,6 +120,20 @@ void InitializePml4(uint64_t pml4_physical_addr) {
pml4_virtual[Pml4Index(hhdm)] = *Pml4Entry(curr_cr3, hhdm);
}
void CleanupPml4(uint64_t pml4_physical_addr) {
uint64_t* pml4_virtual = reinterpret_cast<uint64_t*>(
boot::GetHigherHalfDirectMap() + pml4_physical_addr);
// Iterate the first half of the pml4 as it contains user-space mappings.
for (uint8_t i = 0; i < 128; i++) {
if (pml4_virtual[i] & PRESENT_BIT) {
CleanupPageStructure(pml4_virtual[i] & ~0xFFF, 2);
}
}
phys_mem::FreePage(pml4_physical_addr);
}
void MapPage(uint64_t cr3, uint64_t vaddr, uint64_t paddr) {
vaddr = PageAlign(vaddr);
paddr = PageAlign(paddr);