Memory stuff

kernel/kernel.c

@@ -1,4 +1,5 @@
 #include "kernel.h"
+#include "memory.h"
 #include "paging.h"
 #include "../drivers/vga.h"
 #include "../lib/str.h"

kernel/memory.c

@@ -0,0 +1,14 @@
+#include "memory.h"
+
+// https://wiki.osdev.org/Page_Frame_Allocation
+// page = block
+
+// MAX_BLOCK_SIZE_IN_BITS/8 bytes
+// i.e. : bit i of byte n define status of block 8n+i
+// block = 8n+i
+
+int* alloc_cursor; // keep track of last location that was allocated (may improve speed)
+
+void init_pmm(unsigned int map_addr, unsigned int bsize) {
+
+}

kernel/memory.h

@@ -0,0 +1,5 @@
+#define BLOCK_SIZE 4 // 32 bits = 4 bytes
+#define MEMSIZE_TO_BLOCKS(n) ((n*1024)/BLOCK_SIZE)
+
+void init_pmm(unsigned int map_addr, unsigned int bsize); // Initialize physical memory manager
+