Enable bochs terminal output.

.bochsrc

@@ -10,3 +10,4 @@ log: bochs.log
 romimage: file=/home/drew/opt/bochs/share/bochs/BIOS-bochs-latest
 vgaromimage: file=/home/drew/opt/bochs/share/bochs/VGABIOS-lgpl-latest.bin
 vga: extension=vbe
+port_e9_hack: enabled=1

scripts/bochs.sh

@@ -15,5 +15,5 @@ if [[ $1 == "debug" ]]; then
 fi
 
 # TODO Make this portable, build bochs as a part of toolchain?
-~/opt/bochs/bin/bochs
+~/opt/bochs/bin/bochs $BOCHS_ARGS -q
 

zion/debug/debug.cpp

@@ -5,14 +5,18 @@
 
 #define COM1 0x3f8
 
+#define BOCHS_DBG 1
+
 namespace {
 bool is_transmit_empty() { return (inb(COM1 + 5) & 0x20) != 0; }
 
 void dbgputchar(char c) {
-  while (!is_transmit_empty())
-    ;
+  while (!is_transmit_empty());
 
   outb(COM1, c);
+#if BOCHS_DBG
+  outb(0xe9, c);
+#endif
 }
 
 void dbg(const glcr::StringView& str) {