1 /* 2 * Copyright (c) 2008 Travis Geiselbrecht 3 * 4 * Use of this source code is governed by a MIT-style 5 * license that can be found in the LICENSE file or at 6 * https://opensource.org/licenses/MIT 7 */ 8 #pragma once 9 10 #include <stdint.h> 11 12 /* low level macros for accessing memory mapped hardware registers */ 13 #define REG64(addr) ((volatile uint64_t *)(uintptr_t)(addr)) 14 #define REG32(addr) ((volatile uint32_t *)(uintptr_t)(addr)) 15 #define REG16(addr) ((volatile uint16_t *)(uintptr_t)(addr)) 16 #define REG8(addr) ((volatile uint8_t *)(uintptr_t)(addr)) 17 18 #define RMWREG64(addr, startbit, width, val) *REG64(addr) = (*REG64(addr) & ~(((1<<(width)) - 1) << (startbit))) | ((val) << (startbit)) 19 #define RMWREG32(addr, startbit, width, val) *REG32(addr) = (*REG32(addr) & ~(((1<<(width)) - 1) << (startbit))) | ((val) << (startbit)) 20 #define RMWREG16(addr, startbit, width, val) *REG16(addr) = (*REG16(addr) & ~(((1<<(width)) - 1) << (startbit))) | ((val) << (startbit)) 21 #define RMWREG8(addr, startbit, width, val) *REG8(addr) = (*REG8(addr) & ~(((1<<(width)) - 1) << (startbit))) | ((val) << (startbit)) 22 23 #define writel(v, a) (*REG32(a) = (v)) 24 #define readl(a) (*REG32(a)) 25 #define writeb(v, a) (*REG8(a) = (v)) 26 #define readb(a) (*REG8(a)) 27