Mention test_main and blog_os::init in later posts

blog/content/second-edition/posts/09-paging-implementation/index.md

@@ -436,10 +436,11 @@ We can now use this function to print the entries of the level 4 table:
 // in src/main.rs
 
 fn kernel_main(boot_info: &'static BootInfo) -> ! {
-    […] // initialize GDT, IDT, PICS
-
     use blog_os::memory::active_level_4_table;
 
+    println!("Hello World{}", "!");
+    blog_os::init();
+
     let l4_table = unsafe {
         active_level_4_table(boot_info.physical_memory_offset)
     };
@@ -449,6 +450,10 @@ fn kernel_main(boot_info: &'static BootInfo) -> ! {
         }
     }
 
+    // as before
+    #[cfg(test)]
+    test_main();
+
     println!("It did not crash!");
     blog_os::hlt_loop();
 }
@@ -576,11 +581,11 @@ Let's test our translation function by translating some addresses:
 // in src/main.rs
 
 fn kernel_main(boot_info: &'static BootInfo) -> ! {
-    […] // initialize GDT, IDT, PICS
-
     use blog_os::memory::translate_addr;
     use x86_64::VirtAddr;
 
+    […] // hello world and blog_os::init
+
     let addresses = [
         // the identity-mapped vga buffer page
         0xb8000,
@@ -600,8 +605,7 @@ fn kernel_main(boot_info: &'static BootInfo) -> ! {
         println!("{:?} -> {:?}", virt, phys);
     }
 
-    println!("It did not crash!");
-    blog_os::hlt_loop();
+    […] // test_main(), "it did not crash" printing, and hlt_loop()
 }
 ```
 
@@ -676,12 +680,12 @@ To use the `MapperAllSizes::translate_addr` method instead of our own `memory::t
 // in src/main.rs
 
 fn kernel_main(boot_info: &'static BootInfo) -> ! {
-    […] // initialize GDT, IDT, PICS
-
     // new: different imports
     use blog_os::memory;
     use x86_64::{structures::paging::MapperAllSizes, VirtAddr};
 
+    […] // hello world and blog_os::init
+
     // new: initialize a mapper
     let mapper = unsafe { memory::init(boot_info.physical_memory_offset) };
 
@@ -694,8 +698,7 @@ fn kernel_main(boot_info: &'static BootInfo) -> ! {
         println!("{:?} -> {:?}", virt, phys);
     }
 
-    println!("It did not crash!");
-    blog_os::hlt_loop();
+    […] // test_main(), "it did not crash" printing, and hlt_loop()
 }
 ```
 
@@ -787,11 +790,11 @@ To test our mapping function, we first map page `0x1000` and then try to write t
 // in src/main.rs
 
 fn kernel_main(boot_info: &'static BootInfo) -> ! {
-    […] // initialize GDT, IDT, PICS
-
     use blog_os::memory;
     use x86_64::{structures::paging::Page, VirtAddr};
 
+    […] // hello world and blog_os::init
+
     let mut mapper = unsafe { memory::init(boot_info.physical_memory_offset) };
     let mut frame_allocator = memory::EmptyFrameAllocator;
 
@@ -803,8 +806,7 @@ fn kernel_main(boot_info: &'static BootInfo) -> ! {
     let page_ptr: *mut u64 = page.start_address().as_mut_ptr();
     unsafe { page_ptr.offset(400).write_volatile(0x_f021_f077_f065_f04e)};
 
-    println!("It did not crash!");
-    blog_os::hlt_loop();
+    […] // test_main(), "it did not crash" printing, and hlt_loop()
 }
 ```