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x86_64: pmap: implement pmap_destroy()

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max 🍓
2026-03-18 20:53:24 +00:00
parent 1eef23ea98
commit 42a293e753
1 changed files with 40 additions and 2 deletions
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42
arch/x86_64/pmap.c
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@@ -100,7 +100,7 @@ static void delete_ptab(phys_addr_t pt)
return;
}
pt &= ~VM_PAGE_MASK;
pt = ENTRY_TO_PTR(pt);
if (!pt) {
/* physical address of 0x0, nothing to delete */
return;
@@ -117,7 +117,7 @@ static void delete_pdir(phys_addr_t pd)
return;
}
pd &= ~0x1FFFFFULL;
pd &= ENTRY_TO_PTR(pd);
if (!pd) {
/* physical address of 0x0, nothing to delete */
return;
@@ -412,8 +412,46 @@ pmap_t pmap_create(void)
return pmap;
}
static void delete_pdpt(phys_addr_t pd)
{
if (pd & PTE_PAGESIZE) {
/* this entry points to a hugepage, nothing to delete */
return;
}
pd &= ENTRY_TO_PTR(pd);
if (!pd) {
/* physical address of 0x0, nothing to delete */
return;
}
struct pdpt *pdpt = vm_phys_to_virt(ENTRY_TO_PTR(pd));
for (int i = 0; i < 512; i++) {
if (pdpt->p_pages[i] & PTE_PAGESIZE) {
/* this is a hugepage, there is nothing to delete */
continue;
}
if (!pdpt->p_entries[i]) {
continue;
}
delete_ptab(pdpt->p_entries[i]);
}
kfree(pdpt);
}
void pmap_destroy(pmap_t pmap)
{
struct pml4t *pml4t = vm_phys_to_virt(ENTRY_TO_PTR(pmap));
for (unsigned int i = 0; i < 256; i++) {
if (pml4t->p_entries[i]) {
delete_pdpt(pml4t->p_entries[i]);
}
}
kfree(pml4t);
}
static void log_fault(virt_addr_t fault_addr, enum pmap_fault_flags flags)