From d4623419b0be4d2dddad39b9d993a482e890c967 Mon Sep 17 00:00:00 2001
From: Philipp Oppermann <dev@phil-opp.com>
Date: Mon, 17 Jun 2019 17:51:12 +0200
Subject: [PATCH] Try to use Box type in main.rs

This causes an allocation error because the Dummy::alloc function always returns a null pointer.
---
 src/main.rs | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 10b38955..0d3e0df6 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -4,9 +4,12 @@
 #![test_runner(blog_os::test_runner)]
 #![reexport_test_harness_main = "test_main"]
 
+extern crate alloc;
+
 use blog_os::println;
 use bootloader::{entry_point, BootInfo};
 use core::panic::PanicInfo;
+use alloc::boxed::Box;
 
 entry_point!(kernel_main);
 
@@ -20,13 +23,7 @@ fn kernel_main(boot_info: &'static BootInfo) -> ! {
     let mut mapper = unsafe { memory::init(boot_info.physical_memory_offset) };
     let mut frame_allocator = unsafe { BootInfoFrameAllocator::init(&boot_info.memory_map) };
 
-    // map a previously unmapped page
-    let page = Page::containing_address(VirtAddr::new(0xdeadbeaf000));
-    memory::create_example_mapping(page, &mut mapper, &mut frame_allocator);
-
-    // write the string `New!` to the screen through the new mapping
-    let page_ptr: *mut u64 = page.start_address().as_mut_ptr();
-    unsafe { page_ptr.offset(400).write_volatile(0x_f021_f077_f065_f04e) };
+    let x = Box::new(41);
 
     #[cfg(test)]
     test_main();