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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 "pci_handler.hpp"
#include "data.hpp"
#include <fcntl.h>
#include <linux/aspeed-p2a-ctrl.h>
#include <cstdint>
#include <cstring>
#include <string>
#include <vector>
namespace ipmi_flash
{
const std::string PciDataHandler::p2aControlPath = "/dev/aspeed-p2a-ctrl";
bool PciDataHandler::open()
{
mappedFd = sys->open(p2aControlPath.c_str(), O_RDWR);
if (mappedFd == -1)
{
return false;
}
struct aspeed_p2a_ctrl_mapping map;
map.addr = regionAddress;
map.length = memoryRegionSize;
map.flags = ASPEED_P2A_CTRL_READWRITE;
if (sys->ioctl(mappedFd, ASPEED_P2A_CTRL_IOCTL_SET_WINDOW, &map))
{
sys->close(mappedFd);
mappedFd = -1;
return false;
}
if (sys->ioctl(mappedFd, ASPEED_P2A_CTRL_IOCTL_GET_MEMORY_CONFIG, &map))
{
sys->close(mappedFd);
mappedFd = -1;
return false;
}
/* The length of the region reserved is reported, and it's important
* because the offset + memory region could be beyond that reserved
* region.
*/
std::uint64_t offset = regionAddress - map.addr;
mapped = reinterpret_cast<std::uint8_t*>(
mmap(0, memoryRegionSize, PROT_READ, MAP_SHARED, mappedFd, offset));
if (mapped == MAP_FAILED)
{
sys->close(mappedFd);
mappedFd = -1;
mapped = nullptr;
return false;
}
return true;
}
bool PciDataHandler::close()
{
/* TODO: Turn off the P2A bridge and region to disable host-side access.
*/
if (mapped)
{
sys->munmap(mapped, memoryRegionSize);
mapped = nullptr;
}
if (mappedFd != -1)
{
sys->close(mappedFd);
mappedFd = -1;
}
return true;
}
std::vector<std::uint8_t> PciDataHandler::copyFrom(std::uint32_t length)
{
std::vector<std::uint8_t> results(length);
std::memcpy(results.data(), mapped, length);
return results;
}
bool PciDataHandler::writeMeta(const std::vector<std::uint8_t>& configuration)
{
/* PCI handler doesn't require configuration write, only read. */
return false;
}
std::vector<std::uint8_t> PciDataHandler::readMeta()
{
/* PCI handler does require returning a configuration from read. */
struct PciConfigResponse reply;
reply.address = regionAddress;
std::vector<std::uint8_t> bytes;
bytes.resize(sizeof(reply));
std::memcpy(bytes.data(), &reply, sizeof(reply));
return bytes;
}
} // namespace ipmi_flash
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