Make some documentation a bit more accurate.

[netwatch.git] / include / raw / io.h

diff --git a/include/raw/io.h b/include/raw/io.h
index 5fd0b19e62f4a7c0094229797e0199069a041726..429a70626ca75bf564afb942330a48e628e351ac 100644 (file)
--- a/include/raw/io.h
+++ b/include/raw/io.h
@@ -1,11 +1,22 @@
+/* io.h
+ * I/O port access macros
+ * NetWatch system management mode administration console
+ *
+ * Copyright (c) 2008 Jacob Potter and Joshua Wise.  All rights reserved.
+ * This program is free software; you can redistribute and/or modify it under
+ * the terms found in the file LICENSE in the root of this source tree. 
+ *
+ */
+
+
 #ifndef __IO_H
 #define __IO_H
 
-#define inb(port) ({ unsigned char val; asm volatile("inb %%dx, %0" : "=a" ((unsigned char)(val)) : "d" ((unsigned short)(port))); val; })
-#define inw(port) ({ unsigned short val; asm volatile("inw %%dx, %0" : "=a" ((unsigned short)(val)) : "d" ((unsigned short)(port))); val; })
-#define inl(port) ({ unsigned long val; asm volatile("inl %%dx, %0" : "=a" ((unsigned long)(val)) : "d" ((unsigned short)(port))); val; })
-#define outb(port, val) ({ asm volatile("outb %0, %%dx" : : "a" ((unsigned char)(val)) , "d" ((unsigned short)(port))); })
-#define outw(port, val) ({ asm volatile("outw %0, %%dx" : : "a" ((unsigned short)(val)) , "d" ((unsigned short)(port))); })
-#define outl(port, val) ({ asm volatile("outl %0, %%dx" : : "a" ((unsigned long)(val)) , "d" ((unsigned short)(port))); })
+#define inb(port) __extension__ ({ unsigned char val; asm volatile("inb %%dx, %0" : "=a" ((unsigned char)(val)) : "d" ((unsigned short)(port))); val; })
+#define inw(port) __extension__ ({ unsigned short val; asm volatile("inw %%dx, %0" : "=a" ((unsigned short)(val)) : "d" ((unsigned short)(port))); val; })
+#define inl(port) __extension__ ({ unsigned long val; asm volatile("inl %%dx, %0" : "=a" ((unsigned long)(val)) : "d" ((unsigned short)(port))); val; })
+#define outb(port, val) __extension__ ({ asm volatile("outb %0, %%dx" : : "a" ((unsigned char)(val)) , "d" ((unsigned short)(port))); })
+#define outw(port, val) __extension__ ({ asm volatile("outw %0, %%dx" : : "a" ((unsigned short)(val)) , "d" ((unsigned short)(port))); })
+#define outl(port, val) __extension__ ({ asm volatile("outl %0, %%dx" : : "a" ((unsigned long)(val)) , "d" ((unsigned short)(port))); })
 
 #endif