NoneTextDisplay and some other stuff

kernel/build_and_emulate

@@ -5,8 +5,14 @@ set -e
 DIR="${BASH_SOURCE%/*}"
 if [[ ! -d "$DIR" ]]; then DIR="$PWD"; fi
 
+if [[ $# -lt 1 ]]; then
+    echo "[INFO] Building all targets; no target argument provided"
+fi
+
 . $DIR/build $!
 
 if [[ $# -ge 1 ]]; then
     . $DIR/emulate $!
+else
+    echo "[WARN] Not emulating; no target argument provided"
 fi

kernel/src/kernel/boot.rs

@@ -37,9 +37,9 @@ impl MemoryType {
                     crate::arch::output::sdebugsnp("Hardware specific ");
                     crate::arch::output::sdebugbnp(&crate::u32_as_u8_slice(*val));
                     if *allocatable {
-                        crate::arch::output::sdebugsnp(" allocatable");
+                        crate::arch::output::sdebugsnp(", allocatable");
                     } else {
-                        crate::arch::output::sdebugsnp(" unallocatable");
+                        crate::arch::output::sdebugsnp(", unallocatable");
                     }
                     
             },

kernel/src/kernel/display.rs

@@ -1,5 +1,7 @@
 //! Types, constants and traits for displaying text. Mostly implemented in arch/.
 
+use core::fmt::Write;
+
 /// A type used for color in the functions of [TextDisplay].
 /// 
 /// Type alias for (u8, bool). Boolean argument is whether to
@@ -68,3 +70,23 @@ impl dyn TextDisplay + '_ {
         Ok((x, y))
     }
 }
+
+pub struct NoneTextDisplay {}
+
+impl TextDisplay for NoneTextDisplay {
+    fn get_size(&self) -> (u32, u32) {
+        (1,1)
+    }
+    fn write_char(&self, _: (u32, u32), _: u8, _: Color) -> Result<(), crate::Error<'static>> {
+        Ok(())
+    }
+}
+
+impl Write for NoneTextDisplay {
+    fn write_char(&mut self, _: char) -> core::fmt::Result {
+        Ok(())
+    }
+    fn write_str(&mut self, _: &str) -> core::fmt::Result {
+        Ok(())
+    }
+}

kernel/src/kernel/indep_boot_entry.rs

@@ -5,7 +5,7 @@
 
 use core::alloc::{Allocator, Layout};
 
-use crate::{display::COLOR_DEFAULT, output::*};
+use crate::{display::{NoneTextDisplay, COLOR_DEFAULT}, output::*};
 
 use aphrodite_proc_macros::*;
 
@@ -17,9 +17,9 @@ fn indep_boot_entry(
     display: Option<&dyn crate::display::TextDisplay>,
     #[allow(non_snake_case)] BI: &crate::boot::BootInfo,
 ) -> ! {
-    crate::arch::output::sdebugsln("Entrypoint called");
+    crate::arch::output::sdebugsln("IndepBootEntry called");
 
-    let display = display.unwrap();
+    let display = display.unwrap_or(&NoneTextDisplay {});
 
     display.clear_screen(COLOR_DEFAULT);
     sreset();