From b9c75010e5b18797d8146d59c1f17169e63952b3 Mon Sep 17 00:00:00 2001
From: Matthias Kruk <m@m10k.eu>
Date: Mon, 23 Dec 2019 16:29:46 +0900
Subject: [PATCH] Add io_inb and io_outb methods for IO-port access on
 Intel-based platforms

---
 kernel/arch/Makefile  |  2 +-
 kernel/arch/io.S      | 22 ++++++++++++++++++++++
 kernel/include/arch.h |  3 +++
 3 files changed, 26 insertions(+), 1 deletion(-)
 create mode 100644 kernel/arch/io.S

diff --git a/kernel/arch/Makefile b/kernel/arch/Makefile
index e7e4cce..b63e608 100644
--- a/kernel/arch/Makefile
+++ b/kernel/arch/Makefile
@@ -1,5 +1,5 @@
 OBJECTS = boot.o debug.o init.o cpu.o cpu32.o entry.o interrupt.o paging.o apic.o i8259.o task.o \
-		  heap.o
+		  heap.o io.o
 OUTPUT = arch.o
 LDFLAGS += -r
 INCLUDES = -I../../include -I../include -I../..
diff --git a/kernel/arch/io.S b/kernel/arch/io.S
new file mode 100644
index 0000000..ceca967
--- /dev/null
+++ b/kernel/arch/io.S
@@ -0,0 +1,22 @@
+#define __ASSEMBLY_SOURCE
+
+#include <config.h>
+#include <arch.h>
+#include "defs.h"
+
+	.global io_inb
+	.global io_outb
+
+	.section .text
+
+io_inb:
+	movl	4(%esp), %edx
+	xorl	%eax, %eax
+	inb		%dx, %al
+	ret
+
+io_outb:
+	movl	4(%esp), %edx
+	movl	8(%esp), %eax
+	outb	%al, %dx
+	ret
diff --git a/kernel/include/arch.h b/kernel/include/arch.h
index cc88308..29c8804 100644
--- a/kernel/include/arch.h
+++ b/kernel/include/arch.h
@@ -189,6 +189,9 @@ int     pg_dir_memcpy(pg_dir_t*, void*, pg_dir_t*, void*, u32_t);
 int     pg_dir_mmap(pg_dir_t*, void*, u32_t, int, int, void**);
 int     pg_dir_munmap(pg_dir_t*, void*, u32_t);
 
+u8_t    io_inb(const u16_t);
+void    io_outb(const u16_t, const u8_t);
+
 #endif /* !__ASSEMBLY_SOURCE */
 
 #endif /* __ARCH_H */
-- 
2.47.3