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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_nuvoton.hpp"
#include "mapper_errors.hpp"
#include "window_hw_interface.hpp"
#include <fcntl.h>
#include <sys/mman.h>
#include <cerrno>
#include <cinttypes>
#include <cstdint>
#include <cstdio>
#include <memory>
#include <utility>
#include <vector>
namespace ipmi_flash
{
using std::uint16_t;
using std::uint32_t;
using std::uint8_t;
std::unique_ptr<HardwareMapperInterface>
LpcMapperNuvoton::createNuvotonMapper(std::uint32_t regionAddress,
std::uint32_t regionSize)
{
/* NOTE: Considered making one factory for both types. */
return std::make_unique<LpcMapperNuvoton>(regionAddress, regionSize);
}
MemorySet LpcMapperNuvoton::open()
{
static constexpr auto devmem = "/dev/mem";
mappedFd = sys->open(devmem, O_RDWR | O_SYNC);
if (mappedFd == -1)
{
throw MapperException("Unable to open /dev/mem");
}
mapped = reinterpret_cast<uint8_t*>(sys->mmap(
0, memoryRegionSize, PROT_READ, MAP_SHARED, mappedFd, regionAddress));
if (mapped == MAP_FAILED)
{
sys->close(mappedFd);
mappedFd = -1;
mapped = nullptr;
throw MapperException("Unable to map region");
}
MemorySet output;
output.mappedFd = mappedFd;
output.mapped = mapped;
return output;
}
void LpcMapperNuvoton::close()
{
if (mapped)
{
sys->munmap(mapped, memoryRegionSize);
mapped = nullptr;
}
if (mappedFd != -1)
{
sys->close(mappedFd);
mappedFd = -1;
}
}
/*
* The host buffer address is configured by host through
* SuperIO. On BMC side the max memory can be mapped is 4kB with the caveat that
* first byte of the buffer is reserved as host/BMC semaphore and not usable as
* shared memory.
*
* Mapper returns success for (addr, len) where (addr & 0x7) == 4 and len <=
* (4096 - 4). Otherwise, mapper returns either
* - WindowOffset = 4 and WindowSize = len - 4 if (addr & 0x7) == 0
* - WindowSize = 0 means that the region cannot be mapped otherwise
*/
WindowMapResult LpcMapperNuvoton::mapWindow(std::uint32_t address,
std::uint32_t length)
{
WindowMapResult result = {};
/* We reserve the first 4 bytes from the mapped region; the first byte
* is shared semaphore, and the number of 4 is for alignment.
*/
const uint32_t bmcMapReserveBytes = 4;
const uint32_t bmcMapMaxSizeBytes = 4 * 1024 - bmcMapReserveBytes;
if (length <= bmcMapReserveBytes)
{
std::fprintf(stderr, "window size %" PRIx32 " too small to map.\n",
length);
result.response = EINVAL;
return result;
}
if (length > bmcMapMaxSizeBytes)
{
std::fprintf(stderr,
"window size %" PRIx32 " not supported. Max size 4k.\n",
length);
length = bmcMapMaxSizeBytes;
}
/* If host requested region starts at an aligned address, return offset of 4
* bytes so as to skip the semaphore register.
*/
uint32_t windowOffset = bmcMapReserveBytes;
// uint32_t windowSize = length;
result.response = 0;
result.windowOffset = windowOffset;
result.windowSize = length;
const uint32_t addressOffset = address & 0x7;
if (addressOffset == 0)
{
std::fprintf(stderr, "Map address offset should be 4 for Nuvoton.\n");
result.response = EFBIG;
return result;
}
else if (addressOffset != bmcMapReserveBytes)
{
std::fprintf(stderr, "Map address offset should be 4 for Nuvoton.\n");
result.response = EINVAL;
return result;
}
/* TODO: need a kernel driver to handle mapping configuration.
* Until then program the register through /dev/mem.
*/
int fd;
if ((fd = sys->open("/dev/mem", O_RDWR | O_SYNC)) == -1)
{
std::fprintf(stderr, "Failed to open /dev/mem\n");
sys->close(fd);
result.response = EINVAL;
return result;
}
const uint32_t bmcMapConfigBaseAddr = 0xc0001000;
const uint32_t bmcMapConfigWindowSizeOffset = 0x7;
const uint32_t bmcMapConfigWindowBaseOffset = 0xa;
const uint8_t bmcWindowSizeValue = 0xc; // 4k
const uint16_t bmcWindowBaseValue = 0x8000; // BMC phyAddr from 0xc0008000
int pageSize = sys->getpagesize();
auto mapBasePtr = reinterpret_cast<uint8_t*>(
sys->mmap(nullptr, pageSize, PROT_READ | PROT_WRITE, MAP_SHARED, fd,
bmcMapConfigBaseAddr));
uint8_t* bmcWindowSize = mapBasePtr + bmcMapConfigWindowSizeOffset;
uint16_t* bmcWindowBase =
reinterpret_cast<uint16_t*>(mapBasePtr + bmcMapConfigWindowBaseOffset);
*bmcWindowSize = bmcWindowSizeValue;
*bmcWindowBase = bmcWindowBaseValue;
sys->munmap(mapBasePtr, pageSize);
sys->close(fd);
return result;
}
} // namespace ipmi_flash
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