Rename dirs

mem/virt.c

@@ -0,0 +1,26 @@
+#include <zinnia/alloc.h>
+#include <zinnia/atomic.h>
+#include <zinnia/utils.h>
+#include <zinnia/virt.h>
+#include <stddef.h>
+
+struct page* vm_pfndb = nullptr;
+
+// TODO: Replace with actual allocator.
+
+static _Atomic(size_t) mapping_offset = 0;
+
+uintptr_t vm_alloc(size_t length) {
+    uintptr_t base = arch_mem_mapping_addr();
+    size_t offset = atomic_fetch_add(&mapping_offset, ALIGN_UP(length, arch_mem_page_size()), ATOMIC_ACQUIRE);
+
+    return base + offset;
+}
+
+void vm_free(uintptr_t ptr, size_t length) {
+    // TODO
+}
+
+uintptr_t vm_page_addr(struct page* page) {
+    return (((uintptr_t)page - (uintptr_t)vm_pfndb) / sizeof(struct page)) * arch_mem_page_size();
+}