[libc] Use debug port only for x86 architectures

The bochs/QEMU debug port at I/O port 0xe9 exists only for x86, and there is no direct equivalent for other CPU architectures. Omit the I/O port write instruction on other CPU architectures. Signed-off-by: Michael Brown <[email protected]>
ipxe · Nov 28, 2023 · 2007159 · 2007159
1 parent e902c08
commit 2007159
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/src/stdio.c b/src/stdio.c
@@ -45,8 +45,10 @@ int putchar ( int character ) {
 		putchar ( '\r' );
 
 	/* Print character to bochs debug port */
+#if defined(__i386__) || defined(__x86_64__)
 	__asm__ __volatile__ ( "outb %b0, $0xe9"
 			       : : "a" ( character ) );
+#endif
 
 	/* Print character to EFI/BIOS console as applicable */
 	if ( efi_systab ) {