clean: simplify code

src/memory/frame.c

@@ -13,7 +13,7 @@ void *alloc_frame(void)
 	struct frame_zone *it = head;
 	while (it && !it->remaining_frames)
 		it = it->next;
-	if (it->remaining_frames == 0) {
+	if (!it || it->remaining_frames == 0) {
 		kprintf(KERN_CRIT "No memory zone available (ratio)\n");
 		return NULL;
 	}

src/memory/memory.c

@@ -68,12 +68,11 @@ static void add_frame_node(multiboot_memory_map_t *mmmt)
 
 	// KERNEL code partially on the block
 	if (HEAP_START >= zone) {
-		const uint32_t len = mmmt->len -
-		                     ((uint64_t)&_kernel_end - HEAP_END) -
-		                     (uint64_t)zone;
+		const uint32_t start_space =
+		    CEIL(HEAP_START, PAGE_SIZE) * PAGE_SIZE;
+		const uint32_t len = mmmt->len - (start_space - (uint32_t)zone);
 		mmmt->len = CEIL(len, PAGE_SIZE) * PAGE_SIZE;
-		zone =
-		    (void *)((uint32_t)CEIL(HEAP_START, PAGE_SIZE) * PAGE_SIZE);
+		zone = (void *)start_space;
 	}
 
 	init_page_table(frame_zones_page_table, 0);
@@ -90,9 +89,9 @@ static void add_frame_node(multiboot_memory_map_t *mmmt)
 	/** 8 is cause we are using uint8_t
 	    nb_frame = size / (PAGE_SIZE + 1 / 8)
 	    cause we are using non decimal number
-	    nb_frame = ((size * 8) / (PAGE_SIZE * 8 + 1)) / 8
+	    nb_frame = ((size * 8) / (PAGE_SIZE * 8 + 1))
 	 */
-	const uint32_t nb_frame = ((mmmt->len * 8) / (PAGE_SIZE * 8 + 1)) - 1;
+	const uint32_t nb_frame = ((mmmt->len * 8) / (PAGE_SIZE * 8 + 1));
 
 	current->first_free_frame = 0;
 	current->next = NULL;

src/memory/page.c

@@ -7,8 +7,6 @@
 #include "memory.h"
 #include "utils.h"
 
-#define MAX_TLB_ENTRIES 32
-
 static int16_t find_next_block(size_t nb_pages, uint16_t *pd_index_ptr,
                                uint32_t **page_table_ptr)
 {
@@ -49,7 +47,7 @@ void *alloc_pages(size_t size)
 		void *frame = alloc_frame();
 		if (!frame) {
 			for (size_t j = index; j < i; j++)
-				free_frame((void *)(page_table[j] >> 12));
+				free_frame((void *)(page_table[j] & PAGE_MASK));
 			return NULL;
 		}
 		page_table[i] = ((uint32_t)frame & PAGE_MASK) | INIT_FLAGS;