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/*
* Copyright 2018 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "lpc_aspeed.hpp"
#include "mapper_errors.hpp"
#include "window_hw_interface.hpp"
#include <fcntl.h>
#include <linux/aspeed-lpc-ctrl.h>
#include <linux/kernel.h>
#include <cerrno>
#include <cstdint>
#include <cstring>
#include <memory>
#include <string>
#include <utility>
namespace ipmi_flash
{
const std::string LpcMapperAspeed::lpcControlPath = "/dev/aspeed-lpc-ctrl";
std::unique_ptr<HardwareMapperInterface>
LpcMapperAspeed::createAspeedMapper(std::uint32_t regionAddress,
std::size_t regionSize)
{
/* NOTE: considered using a joint factory to create one or the other, for
* now, separate factories.
*/
return std::make_unique<LpcMapperAspeed>(regionAddress, regionSize);
}
void LpcMapperAspeed::close()
{
if (mappedRegion)
{
sys->munmap(mappedRegion, regionSize);
mappedRegion = nullptr;
}
if (mappedFd != -1)
{
sys->close(mappedFd);
mappedFd = -1;
}
}
WindowMapResult LpcMapperAspeed::mapWindow(std::uint32_t address,
std::uint32_t length)
{
WindowMapResult result = {};
static const std::uint32_t MASK_64K = 0xFFFFU;
const std::uint32_t offset = address & MASK_64K;
if (offset + length > regionSize)
{
std::fprintf(stderr,
"requested window size %" PRIu32 ", offset %#" PRIx32
" is too large for mem region"
" of size %zu\n",
length, offset, regionSize);
result.response = EFBIG;
result.windowSize = regionSize - offset;
return result;
}
struct aspeed_lpc_ctrl_mapping map = {
.window_type = ASPEED_LPC_CTRL_WINDOW_MEMORY,
.window_id = 0,
.flags = 0,
.addr = address & ~MASK_64K,
.offset = 0,
.size = __ALIGN_KERNEL_MASK(offset + length, MASK_64K),
};
std::fprintf(stderr,
"requesting Aspeed LPC window at %#" PRIx32 " of size %" PRIu32
"\n",
map.addr, map.size);
const auto lpcControlFd = sys->open(lpcControlPath.c_str(), O_RDWR);
if (lpcControlFd == -1)
{
std::fprintf(stderr,
"cannot open Aspeed LPC kernel control dev \"%s\"\n",
lpcControlPath.c_str());
result.response = EINVAL;
return result;
}
if (sys->ioctl(lpcControlFd, ASPEED_LPC_CTRL_IOCTL_MAP, &map) == -1)
{
std::fprintf(stderr, "Failed to ioctl Aspeed LPC map with error %s\n",
std::strerror(errno));
sys->close(lpcControlFd);
result.response = EINVAL;
return result;
}
sys->close(lpcControlFd);
result.response = 0;
result.windowOffset = offset;
result.windowSize = length;
return result;
}
MemorySet LpcMapperAspeed::open()
{
if (mapRegion())
{
MemorySet output;
output.mappedFd = mappedFd;
output.mapped = mappedRegion;
return output;
}
throw MapperException("Unable to memory-map region");
}
bool LpcMapperAspeed::mapRegion()
{
/* Open the file to map. */
mappedFd = sys->open(lpcControlPath.c_str(), O_RDONLY | O_SYNC);
if (mappedFd == -1)
{
std::fprintf(stderr, "ipmiflash: unable to open %s\n",
lpcControlPath.c_str());
return false;
}
mappedRegion = reinterpret_cast<uint8_t*>(
sys->mmap(0, regionSize, PROT_READ, MAP_SHARED, mappedFd, 0));
if (mappedRegion == MAP_FAILED)
{
sys->close(mappedFd);
mappedFd = -1;
std::fprintf(stderr, "Mmap failure: '%s'\n", std::strerror(errno));
return false;
}
/* TOOD: There is no close() method here, to close mappedFd, or mappedRegion
* -- therefore, a good next step will be to evaluate whether or not the
* other pieces should go here...
*/
return true;
}
} // namespace ipmi_flash
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