first commit

kernel/src/mm/pmm.h

@@ -0,0 +1,28 @@
+#ifndef PMM_H
+#define PMM_H
+
+#include <stdint.h>
+#define PMM_PAGE_SIZE 4096
+
+typedef struct pmm_stack
+{
+    uintptr_t *pages;
+    uint64_t idx;
+    uint64_t max;
+} pmm_stack_t;
+
+extern uint64_t hhdm_offset;
+
+#define DIV_ROUND_UP(x, y) (((uint64_t)(x) + ((uint64_t)(y) - 1)) / (uint64_t)(y))
+#define ALIGN_UP(x, y) (DIV_ROUND_UP(x, y) * (uint64_t)(y))
+#define ALIGN_DOWN(x, y) (((uint64_t)(x) / (uint64_t)(y)) * (uint64_t)(y))
+
+#define HIGHER_HALF(ptr) ((void *)((uint64_t)ptr) + hhdm_offset)
+#define PHYSICAL(ptr) ((void *)((uint64_t)ptr) - hhdm_offset)
+
+int pmm_init();
+void *pmm_request_page();
+void pmm_free_page(void *ptr);
+void pmm_dump();
+
+#endif // PMM_H