From 1f0ea8244fb80966280bd8ecee6a797130592d27 Mon Sep 17 00:00:00 2001
From: Robin Krahl <robin.krahl@ireas.org>
Date: Sun, 5 Mar 2017 23:16:05 +0100
Subject: arch: add port set, port get and additional register set functions

Add regset16 and regset32 to the existing regset8 in arch.h, and
prtset{8,16,32} and prtget{8,16,32} to access ports.
---
 arch/x86_64/arch.c    | 54 +++++++++++++++++++++++++++++++++++++++++++++++++++
 include/garmos/arch.h | 18 +++++++++++++++++
 2 files changed, 72 insertions(+)

diff --git a/arch/x86_64/arch.c b/arch/x86_64/arch.c
index 68f59fe..0479a52 100644
--- a/arch/x86_64/arch.c
+++ b/arch/x86_64/arch.c
@@ -15,8 +15,62 @@
 #include <garmos/arch.h>
 #include <garmos/types.h>
 
+void prtset8(const uint16_t port, const uint8_t val)
+{
+	asm volatile("outb %0, %1" : : "a" (val), "Nd" (port));
+}
+
+void prtset16(const uint16_t port, const uint16_t val)
+{
+	asm volatile("outw %0, %1" : : "a" (val), "Nd" (port));
+}
+
+void prtset32(const uint16_t port, const uint32_t val)
+{
+	asm volatile("outl %0, %1" : : "a" (val), "Nd" (port));
+}
+
+uint8_t prtget8(const uint16_t port)
+{
+	uint8_t res;
+
+	asm volatile("inb %1, %0" : "=a" (res) : "Nd" (port));
+
+	return res;
+}
+
+uint16_t prtget16(const uint16_t port)
+{
+	uint16_t res;
+
+	asm volatile("inw %1, %0" : "=a" (res) : "Nd" (port));
+
+	return res;
+}
+
+uint32_t prtget32(const uint16_t port)
+{
+	uint32_t res;
+
+	asm volatile("inl %1, %0" : "=a" (res) : "Nd" (port));
+
+	return res;
+}
+
 void regset8(const uint32_t reg, const uint8_t val)
 {
 	volatile uint8_t *p = (volatile uint8_t *) reg;
 	*p = val;
 }
+
+void regset16(const uint32_t reg, const uint16_t val)
+{
+	volatile uint16_t *p = (volatile uint16_t *) reg;
+	*p = val;
+}
+
+void regset32(const uint32_t reg, const uint32_t val)
+{
+	volatile uint32_t *p = (volatile uint32_t *) reg;
+	*p = val;
+}
diff --git a/include/garmos/arch.h b/include/garmos/arch.h
index 1e57e06..0cee4c2 100644
--- a/include/garmos/arch.h
+++ b/include/garmos/arch.h
@@ -17,6 +17,24 @@
 
 #include <garmos/types.h>
 
+/*
+ * The functions in this header depend on the architecture.  They should be
+ * provided by objects from the architecture.
+ */
+
+/* write data to a port */
+void prtset8(const uint16_t port, const uint8_t val);
+void prtset16(const uint16_t port, const uint16_t val);;
+void prtset32(const uint16_t port, const uint32_t val);
+
+/* read data from a port */
+uint8_t prtget8(const uint16_t port);
+uint16_t prtget16(const uint16_t port);
+uint32_t prtget32(const uint16_t port);
+
+/* set a memory register */
 void regset8(const uint32_t reg, const uint8_t val);
+void regset16(const uint32_t reg, const uint16_t val);
+void regset32(const uint32_t reg, const uint32_t val);
 
 #endif
-- 
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