Make end page exclusive when computing the end page for the ramdisk

Co-authored-by: Philipp Oppermann <dev@phil-opp.com>

Author: jasoncouture

common/src/lib.rs

@@ -298,7 +298,7 @@ where
         let physical_address = PhysAddr::new(ramdisk_address);
         let ramdisk_physical_start_page: PhysFrame<Size4KiB> =
             PhysFrame::containing_address(physical_address);
-        let ramdisk_page_count = system_info.ramdisk_len / Size4KiB::SIZE;
+        let ramdisk_page_count = (system_info.ramdisk_len - 1) / Size4KiB::SIZE;
         let ramdisk_physical_end_page = ramdisk_physical_start_page + ramdisk_page_count;
         let start_page = Page::from_start_address(ramdisk_address_start)
             .expect("the ramdisk start address must be page aligned");