Implemented basic yet usable memory allocation

src/kernel/lib/memory.c

@@ -0,0 +1,21 @@
+#include <stdbool.h>
+#include <stdint.h>
+#include "memory.h"
+
+static void *g_free_memory = ALLOC_START;
+
+void *kmalloc(size_t size){
+    void *ptr = g_free_memory;
+    g_free_memory += size;
+    return ptr;
+}
+
+void *kcalloc(size_t count, size_t size){
+    void *ptr = g_free_memory;
+    size *= count;
+    g_free_memory += size;
+    for(int i = 0; i < size; i++){
+        ((uint8_t *)ptr)[i] = 0;
+    }
+    return ptr;
+}

src/kernel/lib/memory.h

@@ -0,0 +1,9 @@
+#pragma once
+
+#include <stddef.h>
+
+#define ALLOC_START (void *)0x1000
+
+void *kmalloc(size_t size);
+// TODO: void kfree(void *ptr);
+void *kcalloc(size_t count, size_t size);

src/kernel/shell.c

@@ -1,6 +1,7 @@
 #include "shell.h"
 #include "lib/stdio.h"
 #include "lib/string.h"
+#include "lib/memory.h"
 
 int shell_run(char *cmd){
     int ret = 0;
@@ -12,6 +13,12 @@ int shell_run(char *cmd){
     else if(!strcmp(cmd, "VERSION")){
         printf("%s\n", OS_VERSION);
     }
+    else if(!strcmp(cmd, "MALLOC")){
+        printf("Allocated 10 bytes:\n%x\n", kmalloc(10));
+    }
+    else if(!strcmp(cmd, "CALLOC")){
+        printf("Allocated and zeroed 10 chars:\n%x\n", kcalloc(10, sizeof(char)));
+    }
     else{
         printf("SHELL: Unknown command \"%s\"\n", cmd);
         ret = 127;