From a1a97aa7b2b0c3d1f3b6766446d605f83de1c561 Mon Sep 17 00:00:00 2001
From: stefan <stefan@s00.xyz>
Date: Fri, 7 Apr 2023 19:02:18 -0400
Subject: stuff and things

---
 sys/kern/mm/kalloc.c | 30 +++++++++++++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

(limited to 'sys/kern/mm')

diff --git a/sys/kern/mm/kalloc.c b/sys/kern/mm/kalloc.c
index b17d432..f354648 100644
--- a/sys/kern/mm/kalloc.c
+++ b/sys/kern/mm/kalloc.c
@@ -1,7 +1,11 @@
 #include <stddef.h>
+#include <stdint.h>
 #include <string.h>
+#include <printf.h>
 #include <mm/kalloc.h>
 
+extern uint64_t HEAP_START; 
+
 typedef struct freenode {
 	struct freenode *next;
 } freenode_t;
@@ -31,10 +35,34 @@ kzalloc(void)
 void
 kfree(void *p)
 {
-	if (p == NULL || (unsigned long)p % PAGE_SIZE)
+	if (p == NULL)
 		return;
 
 	freenode_t *tmp = head;
 	head = p;
 	head->next = tmp;
 }
+
+void
+kalloc_init(void)
+{
+        printf("1\n");
+        freenode_t *p = (freenode_t*)HEAP_START;
+        for (;(unsigned long)p + PAGE_SIZE <= (HEAP_START + 0x100000); p += PAGE_SIZE) {
+                printf("freeing page at %p", p);
+                kfree(p);
+        }
+}
+
+void 
+walkfree(void)
+{
+        freenode_t *node = head;
+        int nfree = 0;
+        while (node) {
+                printf("freenode at %p\n", node);
+                node = node->next;
+                nfree++;
+        }
+        printf("found and printed %d free pages!\n", nfree);
+}
-- 
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