fix VGA on x86_64

kernel/Cargo.lock

@@ -79,7 +79,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 [[package]]
 name = "bootloader"
 version = "0.3.14"
-source = "git+https://github.com/wangrunji0408/bootloader#4014546a8655232d87e863b564ae1e4e027f9849"
+source = "git+https://github.com/wangrunji0408/bootloader#d19ff0de234a8a54d4f93c355af5399672e026ae"
 dependencies = [
  "apic 0.1.0 (git+https://github.com/wangrunji0408/APIC-Rust)",
  "fixedvec 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",

kernel/src/arch/x86_64/driver/vga.rs

@@ -68,7 +68,8 @@ impl VgaBuffer {
 
 lazy_static! {
 	pub static ref VGA_WRITER: Mutex<VgaWriter> = Mutex::new(
-		VgaWriter::new(unsafe{ &mut *((KERNEL_OFFSET + 0xb8000) as *mut VgaBuffer) })
+	    // VGA virtual address is specified at bootloader
+		VgaWriter::new(unsafe{ &mut *((KERNEL_OFFSET + 0xf0000000) as *mut VgaBuffer) })
 	);
 }
 

kernel/src/arch/x86_64/io.rs

@@ -1,4 +1,5 @@
 use super::driver::serial::*;
+use super::driver::vga::VGA_WRITER;
 use core::fmt::{Arguments, Write};
 
 pub fn getchar() -> char {
@@ -7,6 +8,14 @@ pub fn getchar() -> char {
 }
 
 pub fn putfmt(fmt: Arguments) {
-    unsafe { COM1.force_unlock(); }
-    COM1.lock().write_fmt(fmt).unwrap()
+    #[cfg(feature = "nographic")]
+    {
+        unsafe { COM1.force_unlock(); }
+        COM1.lock().write_fmt(fmt).unwrap();
+    }
+    #[cfg(not(feature = "nographic"))]
+    {
+        unsafe { VGA_WRITER.force_unlock(); }
+        VGA_WRITER.lock().write_fmt(fmt).unwrap();
+    }
 }