fix: bzero page tables before use it, alloc return the right index

src/memory/kern/page.c

@@ -14,13 +14,13 @@ static uint32_t *find_next_block(size_t nb_pages)
 	uint32_t count = 0;
 	for (uint32_t *pte = PTE2VA(1023, KERNEL_PT_START);
 	     pte < PTE2VA(1023, KERNEL_PT_END); pte++) {
-		if (!*pte) {
+		if (*pte) {
 			count = 0;
 			continue;
 		}
 		count++;
 		if (count == nb_pages)
-			return pte - count;
+			return pte - (count - 1);
 	}
 	return NULL;
 }

src/memory/memory.c

@@ -124,6 +124,7 @@ void init_memory()
 		if (!frame)
 			kpanic("Couldn't initialize kernel PTs\n");
 		PD[i] = frame | INIT_FLAGS;
+		bzero(PTE2VA(1023, i), PAGE_SIZE);
 	}
 	// kalash kalash kalash sur la mélodie chez nous pas de félonie ça vient
 	// de Sevran les R

src/memory/virt/page.c

@@ -15,6 +15,7 @@ static int8_t alloc_pagetable(uint16_t pd_index)
 	if (!pt)
 		return -1;
 	PD[pd_index] = (uint32_t)pt | INIT_FLAGS;
+	bzero(PTE2VA(1023, pd_index), PAGE_SIZE);
 	return 0;
 }
 
@@ -26,13 +27,13 @@ static uint32_t *find_next_block(size_t nb_pages)
 			if (alloc_pagetable(i) < 0)
 				return NULL;
 		for (size_t j = 0; j < 1024; j++) {
-			if (!*GET_PTE(i, j)) {
+			if (*GET_PTE(i, j)) {
 				count = 0;
 				continue;
 			}
 			count++;
 			if (count == nb_pages) {
-				return GET_PTE(i, j) - count;
+				return GET_PTE(i, j) - (count - 1);
 			}
 		}
 	}