Feat: lab 4

kernel/include/mman.h

@@ -0,0 +1,37 @@
+#pragma once
+
+#include <stddef.h>
+#include <dtb.h>
+
+#define MMAN_NO_PAGE 0xffffffffffffffff
+#define PAGE_SIZE (1 << 12)
+
+// PAGE_FREE      => available
+// PAGE_ALLOCATED => this range is allocated explicitly
+// PAGE_DIVIDED   => this range is divided into smaller range
+// PAGE_RESERVED  => this range is reserved explicitly
+typedef enum :uint8_t {
+  PAGE_FREE      = 0,
+  PAGE_ALLOCATED = 1,
+  PAGE_DIVIDED   = 2,
+  PAGE_RESERVED  = 3,
+} page_state_t;
+
+typedef struct {
+  page_state_t state;
+  uint64_t maxsz;
+} page_header_t;
+
+void mman_init();
+
+void *allocate_page(size_t page_cnt);
+void free_page(void *ptr);
+void reserve_page(void *begin, void *end);
+
+void mman_fdt_memory_cb_func(const vector_t *props);
+
+extern fdt_callback_t mman_dtb_memory_cb;
+extern void *mman_memory_start;
+extern void *mman_memory_end;
+extern size_t mman_page_cnt;
+extern page_header_t *mman_frame_array;