| /* |
| * 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 |