From 0529ecc2989e0e7988909a659f88e0723c1299b5 Mon Sep 17 00:00:00 2001
From: "E. Almqvist" <elalmqvist@gmail.com>
Date: Fri, 3 Dec 2021 09:08:06 +0100
Subject: [PATCH] Memory stuff

---
 kernel/kernel.c |  1 +
 kernel/memory.c | 14 ++++++++++++++
 kernel/memory.h |  5 +++++
 3 files changed, 20 insertions(+)
 create mode 100644 kernel/memory.c
 create mode 100644 kernel/memory.h

diff --git a/kernel/kernel.c b/kernel/kernel.c
index d6219b9..b699ccc 100644
--- a/kernel/kernel.c
+++ b/kernel/kernel.c
@@ -1,4 +1,5 @@
 #include "kernel.h"
+#include "memory.h"
 #include "paging.h"
 #include "../drivers/vga.h"
 #include "../lib/str.h"
diff --git a/kernel/memory.c b/kernel/memory.c
new file mode 100644
index 0000000..bb577e4
--- /dev/null
+++ b/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) {
+
+}
diff --git a/kernel/memory.h b/kernel/memory.h
new file mode 100644
index 0000000..5d46f0b
--- /dev/null
+++ b/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
+