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page cache rewrite

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Matheus
2026-07-28 16:33:55 -03:00
parent ad1740738b
commit 31f9ae17cf
17 changed files with 494 additions and 608 deletions
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kernel-src/mm/page.c
+6 -6
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@@ -119,7 +119,7 @@ static void remove_from_free_list(page_t *page) {
static void internal_hold(page_t *page) {
if (++page->refcount == 1) {
// this is only valid on standby pages, in case of free pages its an use after free
__assert((page->flags & PAGE_FLAGS_FREE) == 0);
__assert((__atomic_load_n(&page->flags, __ATOMIC_RELAXED) & PAGE_FLAGS_FREE) == 0);
remove_from_free_list(page);
}
}
@@ -147,10 +147,10 @@ void mm_release_page(void *addr) {
__assert(page->refcount != 0);
if (--page->refcount == 0) {
__assert(!mm_is_page_locked(page));
__assert((page->flags & PAGE_FLAGS_DIRTY) == 0);
__assert((__atomic_load_n(&page->flags, __ATOMIC_RELAXED) & PAGE_FLAGS_DIRTY) == 0);
insert_in_free_list(page);
if (page->backing == NULL)
page->flags |= PAGE_FLAGS_FREE;
__atomic_or_fetch(&page->flags, PAGE_FLAGS_FREE, __ATOMIC_RELAXED);
}
MUTEX_RELEASE(&free_list_mutex);
}
@@ -236,7 +236,7 @@ void mm_force_free_page(void *address, size_t count) {
uintmax_t page_id = base_id + i;
PAGE_BOUNDARY_CHECK(page_id);
page_t *page = &pages[page_id];
page->flags |= PAGE_FLAGS_FREE;
__atomic_or_fetch(&page->flags, PAGE_FLAGS_FREE, __ATOMIC_RELAXED);
insert_in_free_list(page);
}
MUTEX_RELEASE(&free_list_mutex);
@@ -277,7 +277,7 @@ void mm_page_init() {
if (e->type == LIMINE_MEMMAP_USABLE) {
int first_usable_page = e == biggest ? ROUND_UP(e->base + page_count * sizeof(page_t), PAGE_SIZE) / PAGE_SIZE : e->base / PAGE_SIZE;
for (int i = first_usable_page; i < (e->base + e->length) / PAGE_SIZE; ++i) {
pages[i].flags |= PAGE_FLAGS_FREE;
__atomic_or_fetch(&pages[i].flags, PAGE_FLAGS_FREE, __ATOMIC_RELAXED);
insert_in_free_list(&pages[i]);
}
} else if (e->type == LIMINE_MEMMAP_BOOTLOADER_RECLAIMABLE) {
@@ -311,7 +311,7 @@ void *mm_alloc_pages(size_t size, int section) {
if (page >= page_count)
break;
if (pages[page].flags & PAGE_FLAGS_FREE) {
if (__atomic_load_n(&pages[page].flags, __ATOMIC_RELAXED) & PAGE_FLAGS_FREE) {
++found;
} else
found = 0;