kernel/amd64: io: Add I/O helpers

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 78 insertions, 0 deletions

diff --git a/sys/include/arch/amd64/io.h b/sys/include/arch/amd64/io.h
new file mode 100644
index 0000000..8b2ff8f
--- /dev/null
+++ b/sys/include/arch/amd64/io.h
@@ -0,0 +1,78 @@
+/*
+ * Copyright (c) 2023 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _AMD64_IO_H_
+#define _AMD64_IO_H_
+
+#include <sys/types.h>
+#include <sys/cdefs.h>
+
+static inline uint8_t
+inb(uint16_t port)
+{
+    uint8_t result;
+    __asm__("in %%dx, %%al" : "=a" (result) : "d" (port));
+    return result;
+}
+
+static inline void
+outb(uint16_t port, uint8_t data)
+{
+    __asm__("out %%al, %%dx" : :"a" (data), "d" (port));
+}
+
+static inline void
+outw(uint16_t port, uint16_t data)
+{
+    __ASMV("outw %w0, %w1" : : "a" (data), "Nd" (port));
+}
+
+static inline uint16_t
+inw(uint16_t port)
+{
+    uint16_t data;
+    __ASMV("inw %w1, %w0" : "=a" (data) : "Nd" (port));
+    return data;
+}
+
+static inline void
+outl(uint16_t port, uint32_t data)
+{
+    __ASMV("outl %0, %w1" : : "a" (data), "Nd" (port));
+}
+
+static inline uint32_t
+inl(uint16_t port)
+{
+    uint32_t data;
+    __ASMV("inl %w1, %0" : "=a" (data) : "Nd" (port));
+    return data;
+}
+
+#endif  /* !_AMD64_IO_H_ */