[freenos] r334 committed - Implemented insw() to read words from an I/O port....
- From: codesite-noreply@xxxxxxxxxx
- To: freenos@xxxxxxxxxxxxx
- Date: Thu, 03 Sep 2009 22:51:58 +0000
Revision: 334
Author: nieklinnenbank
Date: Thu Sep 3 15:48:39 2009
Log: Implemented insw() to read words from an I/O port.
This function is currently a macro definition.
http://code.google.com/p/freenos/source/detail?r=334
Modified:
/trunk/include/X86/CPU.h
=======================================
--- /trunk/include/X86/CPU.h Wed Jul 8 15:44:39 2009
+++ /trunk/include/X86/CPU.h Thu Sep 3 15:48:39 2009
@@ -121,6 +121,18 @@
b; \
})
+/**
+ * Read a word from a port.
+ * @param port The I/O port to read from.
+ * @return Word read from the port.
+ */
+#define inw(port) \
+({ \
+ unsigned short w; \
+ asm volatile ("inw %%dx, %%ax" : "=a" (w) : "d" (port)); \
+ w; \
+})
+
/**
* Output a byte to a port.
* @param port Port to write to.
Other related posts:
- » [freenos] r334 committed - Implemented insw() to read words from an I/O port.... - codesite-noreply
