stuff

kernel/mem/virt.c

@@ -0,0 +1,26 @@
+#include <common/utils.h>
+#include <kernel/alloc.h>
+#include <kernel/virt.h>
+#include <stdatomic.h>
+#include <stddef.h>
+
+struct page* vm_pfndb = nullptr;
+
+// TODO: Replace with actual allocator.
+
+static size_t mapping_offset = 0;
+
+void* 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()));
+
+    return (void*)(base + offset);
+}
+
+void vm_free(void* 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();
+}