Changes between Version 1 and Version 2 of IoPorts

Timestamp:

04/07/07 13:12:12 (6 years ago)

Author:

ffjeld

Comment:

io-port is a function not a macro. Added a bit of info on the types.

IoPorts

@@ -1 +1 @@
 When accessing the hardware directly, one of the most common operations is to read and write to hardware IO ports.
 
-There is a macro located in losp/muerte/io-ports.lisp.  This macro establishes an easy to use method of using IO ports.
+There is an accessor function (and compiler-macro) located in losp/muerte/io-ports.lisp.  This accessor establishes an easy to use method of using IO ports.
 
 Reading from an IO port is accomplished through the following function call:
@@ -11 +11 @@
   * <address> is the io-port address.
   * <data-type> is one of the following:
-    * unsigned-byte8
-    * unsigned-byte16
-    * unsigned-byte32
-    * character
-    * location
+    * :unsigned-byte8 - an 8-bit integer (using inb/outb).
+    * :unsigned-byte16 - a 16-bit integer (inw/outw).
+    * :unsigned-byte32 - a 32-bit integer (ind/outd).
+    * :character - an 8-bit character (inb/outb).
+    * :location - a fixnum, i.e. a lispval whose lower two bits are forced to zero (ind/outd).
 
 To write to an IO port you use the following construction