abstract out iterating over virtual memory

most syscalls will have to do this to copy memory around or whatever.
it's pretty ugly too, but i can't come up with a better abstraction...

1 files changed, 21 insertions, 0 deletions

diff --git a/src/kernel/mem.h b/src/kernel/mem.h
index b17ba30..78de8db 100644
--- a/src/kernel/mem.h
+++ b/src/kernel/mem.h
@@ -1,4 +1,5 @@
 #pragma once
+#include <kernel/arch/generic.h>
 #include <kernel/main.h>
 #include <stddef.h>
 
@@ -12,3 +13,23 @@ void page_free(void *first, size_t pages);
 
 void *kmalloc(size_t len);
 void kfree(void *ptr);
+
+
+// used for iterating through some part of a process' memory
+struct virt_iter {
+	void *frag;
+	size_t frag_len;
+	bool error;
+
+	void *_virt;
+	size_t _remaining;
+	struct pagedir *_pages;
+	bool _user;
+	bool _writeable;
+};
+
+void virt_iter_new(
+		struct virt_iter *iter, void *virt, size_t length,
+		struct pagedir *pages, bool user, bool writeable);
+
+bool virt_iter_next(struct virt_iter *);