Implement mm_free_page_pte.
Change-Id: I535b71957d30b43420c6722931ae5b1ad88626df
diff --git a/src/mm.c b/src/mm.c
index 51331be..11edd45 100644
--- a/src/mm.c
+++ b/src/mm.c
@@ -138,17 +138,25 @@
/**
* Frees all page-table-related memory associated with the given pte at the
- * given level.
+ * given level, including any subtables recursively.
*/
-static void mm_free_page_pte(pte_t pte, int level, bool sync)
+static void mm_free_page_pte(pte_t pte, int level)
{
- (void)pte;
- (void)level;
- (void)sync;
- /* TODO: Implement.
- if (!arch_mm_pte_is_present(pte, level) || level < 1)
+ pte_t *table;
+ uint64_t i;
+
+ if (!arch_mm_pte_is_table(pte, level)) {
return;
- */
+ }
+
+ table = ptr_from_va(va_from_pa(arch_mm_table_from_pte(pte)));
+ /* Recursively free any subtables. */
+ for (i = 0; i < PAGE_SIZE / sizeof(pte_t); ++i) {
+ mm_free_page_pte(table[i], level - 1);
+ }
+
+ /* Free the table itself. */
+ hfree(table);
}
/**
@@ -183,7 +191,7 @@
*pte = arch_mm_block_pte(level, pa, attrs);
/* TODO: Add barrier. How do we ensure this
* isn't in use by another CPU? Send IPI? */
- mm_free_page_pte(v, level, sync);
+ mm_free_page_pte(v, level);
}
} else {
pte_t *nt = mm_populate_table_pte(pte, level, sync);
