[test-runner] Add support for MMIO ops
Bug: 124277696
Change-Id: Id7b1672915ab102f771e54589971f6d49e37c202
diff --git a/test-runner/arm64/include/arch/io-mem.h b/test-runner/arm64/include/arch/io-mem.h
new file mode 100644
index 0000000..a173cfb
--- /dev/null
+++ b/test-runner/arm64/include/arch/io-mem.h
@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy,
+ * modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#pragma once
+
+/*
+ * Defines primitives for accessing memory mapped devices.
+ * As both VirtIO and PCI use little endian, and we support only
+ * AArch64, we do not perform endianness conversions.
+ */
+
+#include <stdint.h>
+
+#define rmb() __asm__ __volatile__("dmb ld" : : : "memory")
+#define wmb() __asm__ __volatile__("dmb st" : : : "memory")
+
+#define u(width) uint##width##_t
+
+#define build_io(width, prefix, suffix) \
+ static inline u(width) io_read_##width(const volatile u(width) * addr) { \
+ u(width) out; \
+ __asm__ __volatile__("ldr" suffix " %" prefix "0, [%1]" \
+ : "=r"(out) \
+ : "r"(addr)); \
+ rmb(); \
+ return out; \
+ } \
+ static inline void io_write_##width(volatile u(width) * addr, \
+ u(width) val) { \
+ wmb(); \
+ __asm__ __volatile__("str" suffix " %" prefix "0, [%1]" \
+ : \
+ : "rZ"(val), "r"(addr) \
+ : "memory"); \
+ }
+
+build_io(8, "w", "b");
+build_io(16, "w", "h");
+build_io(32, "w", "");
+build_io(64, "x", "");
+
+#undef u
+#undef build_io
