1 files changed, 50 insertions, 0 deletions
diff --git a/include/reg.h b/include/reg.h
new file mode 100644
index 0000000..321074b
--- /dev/null
+++ b/include/reg.h
@@ -0,0 +1,50 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * reg.h - mmio accessors. ld/st straight to the device, nothing cute.
+ *
+ * Copyright (C) 2026 Bradley Morgan <brads@mainlining.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __REG_H
+#define __REG_H
+
+#include <sys/types.h>
+#include <stdint.h>
+
+#define REG32(addr) ((volatile uint32_t *)(uintptr_t)(addr))
+
+static inline void writel(uint32_t v, volatile void *addr)
+{
+	*(volatile uint32_t *)addr = v;
+}
+
+static inline uint32_t readl(const volatile void *addr)
+{
+	return *(const volatile uint32_t *)addr;
+}
+
+static inline void writew(uint16_t v, volatile void *addr)
+{
+	*(volatile uint16_t *)addr = v;
+}
+
+static inline uint16_t readw(const volatile void *addr)
+{
+	return *(const volatile uint16_t *)addr;
+}
+
+static inline void writeb(uint8_t v, volatile void *addr)
+{
+	*(volatile uint8_t *)addr = v;
+}
+
+static inline uint8_t readb(const volatile void *addr)
+{
+	return *(const volatile uint8_t *)addr;
+}
+
+#endif