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mm: properly implement page locking

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Matheus
2026-07-08 01:37:12 -03:00
parent af30088c0d
commit 1512b2f3c6
14 changed files with 123 additions and 45 deletions
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kernel-src/mm/page.c
+15
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@@ -146,6 +146,7 @@ void mm_release_page(void *addr) {
MUTEX_ACQUIRE(&free_list_mutex);
__assert(page->refcount != 0);
if (--page->refcount == 0) {
__assert(!mm_is_page_locked(page));
__assert((page->flags & PAGE_FLAGS_DIRTY) == 0);
insert_in_free_list(page);
if (page->backing == NULL)
@@ -154,6 +155,20 @@ void mm_release_page(void *addr) {
MUTEX_RELEASE(&free_list_mutex);
}
void mm_unlock_and_release_page(void *addr) {
page_t *page = &pages[(uintptr_t)addr / PAGE_SIZE];
mm_unlock_page(page);
mm_release_page(addr);
}
bool mm_is_page_locked(page_t *page) {
return __atomic_load_n(&page->lock_count, __ATOMIC_SEQ_CST) > 0;
}
void mm_unlock_page(page_t *page) {
__assert(__atomic_fetch_sub(&page->lock_count, 1, __ATOMIC_SEQ_CST) > 0);
}
static void do_alloc(page_t *page) {
__assert(page->refcount == 0);
memset(page, 0, sizeof(page_t));