From 13435bfc961fd2abd5f688ce37e94d5f96b0873b Mon Sep 17 00:00:00 2001
From: Andreas Baumann <mail@andreasbaumann.cc>
Date: Sat, 22 Jul 2017 22:17:18 +0200
Subject: added 16-bit port class

---
 src/hardware/port.asm | 24 ++++++++++++++++++++++++
 src/hardware/port.c   |  7 +++++++
 src/hardware/port.h   | 10 +++++++++-
 3 files changed, 40 insertions(+), 1 deletion(-)

diff --git a/src/hardware/port.asm b/src/hardware/port.asm
index 555a4e8..c7e7bc4 100644
--- a/src/hardware/port.asm
+++ b/src/hardware/port.asm
@@ -24,6 +24,30 @@ port8_read:
 	leave
 	ret
 
+global port16_write
+global port16_read
+
+; void port16_write( port16_t *port, uint16_t data );
+port16_write:
+	push ebp
+	mov ebp, esp
+	mov ecx, [ebp+8]
+	mov edx, DWORD [ecx]
+	mov ax, WORD [ebp+12]
+	out dx, ax
+	leave
+	ret
+
+; uint16_t port16_read( port16_t *port )
+port16_read:
+	push ebp
+	mov ebp, esp
+	mov ecx, DWORD [ebp+8]
+	mov edx, [ecx]
+	in ax, dx
+	leave
+	ret
+
 global port32_write
 global port32_read
 
diff --git a/src/hardware/port.c b/src/hardware/port.c
index 46e7f37..aa92b82 100644
--- a/src/hardware/port.c
+++ b/src/hardware/port.c
@@ -9,6 +9,13 @@ void port8_init( port8_t *port, uint16_t number )
 	port->number = number;
 }
 
+void port16_init( port16_t *port, uint16_t number )
+{
+	memset( port, 0, sizeof( port16_t ) );
+
+	port->number = number;
+}
+
 void port32_init( port32_t *port, uint16_t number )
 {
 	memset( port, 0, sizeof( port32_t ) );
diff --git a/src/hardware/port.h b/src/hardware/port.h
index 8203fea..d083220 100644
--- a/src/hardware/port.h
+++ b/src/hardware/port.h
@@ -12,7 +12,15 @@ void port8_write( port8_t *port, uint8_t data );
 uint8_t port8_read( port8_t *port );
 
 typedef struct {
-	uint16_t number; // port number, e.g. 0x3d4 VGA index register
+	uint16_t number;
+} port16_t;
+
+void port16_init( port16_t *port, uint16_t number );
+void port16_write( port16_t *port, uint16_t data );
+uint16_t port16_read( port16_t *port );
+
+typedef struct {
+	uint16_t number;
 } port32_t;
 
 void port32_init( port32_t *port, uint16_t number );
-- 
cgit v1.2.3-54-g00ecf