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// Copyright 2020 The Pigweed Authors
//
// 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
//
// https://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.
#define PW_LOG_MODULE_NAME "PW_FLASH"
#define PW_LOG_LEVEL PW_KVS_LOG_LEVEL
#include "pw_kvs/fake_flash_memory.h"
#include "pw_kvs_private/config.h"
#include "pw_log/log.h"
namespace pw::kvs {
Status FlashError::Check(span<FlashError> errors,
FlashMemory::Address address,
size_t size) {
for (auto& error : errors) {
if (Status status = error.Check(address, size); !status.ok()) {
return status;
}
}
return OkStatus();
}
Status FlashError::Check(FlashMemory::Address start_address, size_t size) {
// Check if the event overlaps with this address range.
if (begin_ != kAnyAddress &&
(start_address >= end_ || (start_address + size) <= begin_)) {
return OkStatus();
}
if (delay_ > 0u) {
delay_ -= 1;
return OkStatus();
}
if (remaining_ == 0u) {
return OkStatus();
}
if (remaining_ != kAlways) {
remaining_ -= 1;
}
return status_;
}
Status FakeFlashMemory::Erase(Address address, size_t num_sectors) {
if (address % sector_size_bytes() != 0) {
PW_LOG_ERROR(
"Attempted to erase sector at non-sector aligned boundary; address %x",
unsigned(address));
return Status::InvalidArgument();
}
const size_t sector_id = address / sector_size_bytes();
if (address / sector_size_bytes() + num_sectors > sector_count()) {
PW_LOG_ERROR(
"Tried to erase a sector at an address past flash end; "
"address: %x, sector implied: %u",
unsigned(address),
unsigned(sector_id));
return Status::OutOfRange();
}
std::memset(
&buffer_[address], int(kErasedValue), sector_size_bytes() * num_sectors);
return OkStatus();
}
StatusWithSize FakeFlashMemory::Read(Address address, span<std::byte> output) {
if (address + output.size() >= sector_count() * size_bytes()) {
return StatusWithSize::OutOfRange();
}
// Check for injected read errors
Status status = FlashError::Check(read_errors_, address, output.size());
std::memcpy(output.data(), &buffer_[address], output.size());
return StatusWithSize(status, output.size());
}
StatusWithSize FakeFlashMemory::Write(Address address,
span<const std::byte> data) {
if (address % alignment_bytes() != 0 ||
data.size() % alignment_bytes() != 0) {
PW_LOG_ERROR("Unaligned write; address %x, size %u B, alignment %u",
unsigned(address),
unsigned(data.size()),
unsigned(alignment_bytes()));
return StatusWithSize::InvalidArgument();
}
if (address + data.size() > sector_count() * sector_size_bytes()) {
PW_LOG_ERROR(
"Write beyond end of memory; address %x, size %u B, max address %x",
unsigned(address),
unsigned(data.size()),
unsigned(sector_count() * sector_size_bytes()));
return StatusWithSize::OutOfRange();
}
// Check in erased state
for (unsigned i = 0; i < data.size(); i++) {
if (buffer_[address + i] != kErasedValue) {
PW_LOG_ERROR("Writing to previously written address: %x",
unsigned(address));
return StatusWithSize::Unknown();
}
}
// Check for any injected write errors
Status status = FlashError::Check(write_errors_, address, data.size());
std::memcpy(&buffer_[address], data.data(), data.size());
return StatusWithSize(status, data.size());
}
std::byte* FakeFlashMemory::FlashAddressToMcuAddress(Address address) const {
if (address > sector_count() * sector_size_bytes()) {
PW_LOG_ERROR(
"FlashAddressToMcuAddress beyond end of memory; address %x, max "
"address %x",
unsigned(address),
unsigned(sector_count() * sector_size_bytes()));
return nullptr;
}
return buffer_.data() + address;
}
} // namespace pw::kvs
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