mmap_gas.h

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/*
 * Microsemi Switchtec(tm) PCIe Management Library
 * Copyright (c) 2017, Microsemi Corporation
 *
 * 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.
 *
 */

 
#ifndef LIBSWITCHTEC_MMAP_GAS_H
#define LIBSWITCHTEC_MMAP_GAS_H
 
#include <unistd.h>
#include <stdint.h>
#include <string.h>
 
#ifdef __CHECKER__
#define __force __attribute__((force))
#else
#define __force
#endif
 
#include "../switchtec_priv.h"
 
static void mmap_memcpy_to_gas(struct switchtec_dev *dev, void __gas *dest,
                   const void *src, size_t n)
{
    memcpy((void __force *)dest, src, n);
}
 
static void mmap_memcpy_from_gas(struct switchtec_dev *dev, void *dest,
                 const void __gas *src, size_t n)
{
    memcpy(dest, (void __force *)src, n);
}
 
static ssize_t mmap_write_from_gas(struct switchtec_dev *dev, int fd,
                   const void __gas *src, size_t n)
{
    return write(fd, (void __force *)src, n);
}
 
#define create_gas_read(type, suffix) \
    static type mmap_gas_read ## suffix(struct switchtec_dev *dev, \
                        type __gas *addr) \
    { \
        type *safe_addr = (type __force *)addr; \
        asm volatile("": : :"memory"); \
        return *safe_addr; \
    }
 
#define create_gas_write(type, suffix) \
    static void mmap_gas_write ## suffix(struct switchtec_dev *dev, \
                         type val, type __gas *addr) \
    { \
        type *safe_addr = (type __force *)addr; \
        asm volatile("": : :"memory"); \
        *safe_addr = val; \
    }
 
create_gas_read(uint8_t, 8);
create_gas_read(uint16_t, 16);
create_gas_read(uint32_t, 32);
create_gas_read(uint64_t, 64);
 
create_gas_write(uint8_t, 8);
create_gas_write(uint16_t, 16);
create_gas_write(uint32_t, 32);
create_gas_write(uint64_t, 64);
 
#undef __force
 
#endif