From 3b66779d9a8325c77c6cfbf1565885f98da5378f Mon Sep 17 00:00:00 2001
From: Danny Holman <dholman@gymli.org>
Date: Thu, 28 Mar 2024 21:55:33 -0500
Subject: arch: i386: kernel: implement a kmalloc function

Add a basic kmalloc implementation. This allows the kernel to allocate
blocks smaller than a whole page.

Signed-off-by: Danny Holman <dholman@gymli.org>
---
 include/kernel/data/ringbuf.h |  2 +-
 include/kernel/kmalloc.h      | 18 ++++++++++++++++++
 2 files changed, 19 insertions(+), 1 deletion(-)
 create mode 100644 include/kernel/kmalloc.h

(limited to 'include/kernel')

diff --git a/include/kernel/data/ringbuf.h b/include/kernel/data/ringbuf.h
index 4f30874..25a7125 100644
--- a/include/kernel/data/ringbuf.h
+++ b/include/kernel/data/ringbuf.h
@@ -1,7 +1,7 @@
 #ifndef KERNEL_RINGBUF_H
 #define KERNEL_RINGBUF_H
 
-#include <kernel/mem.h>
+#include <kernel/kmalloc.h>
 #include <kernel/string.h>
 #include <stdint.h>
 
diff --git a/include/kernel/kmalloc.h b/include/kernel/kmalloc.h
new file mode 100644
index 0000000..d8debd1
--- /dev/null
+++ b/include/kernel/kmalloc.h
@@ -0,0 +1,18 @@
+#ifndef KERNEL_KMALLOC_H
+#define KERNEL_KMALLOC_H
+
+#include <stdint.h>
+#include <stddef.h>
+
+struct mem_block {
+        uintptr_t start;
+        size_t size;
+        int alloc;
+        struct mem_block *next;
+};
+
+void kmalloc_init(void);
+void* kmalloc(size_t sz);
+void kfree(void *ptr);
+
+#endif
-- 
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