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>

2 files changed, 19 insertions, 1 deletions

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