HeapBlockDevice.cpp

00001 /* mbed Microcontroller Library
00002  * Copyright (c) 2017 ARM Limited
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *     http://www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 
00017 #include "HeapBlockDevice.h"
00018 
00019 
00020 HeapBlockDevice::HeapBlockDevice(bd_size_t size, bd_size_t block)
00021     : _read_size(block), _program_size(block), _erase_size(block)
00022     , _count(size / block), _blocks(0)
00023 {
00024     MBED_ASSERT(_count * _erase_size == size);
00025 }
00026 
00027 HeapBlockDevice::HeapBlockDevice(bd_size_t size, bd_size_t read, bd_size_t program, bd_size_t erase)
00028     : _read_size(read), _program_size(program), _erase_size(erase)
00029     , _count(size / erase), _blocks(0)
00030 {
00031     MBED_ASSERT(_count * _erase_size == size);
00032 }
00033 
00034 HeapBlockDevice::~HeapBlockDevice()
00035 {
00036     if (_blocks) {
00037         for (size_t i = 0; i < _count; i++) {
00038             free(_blocks[i]);
00039         }
00040 
00041         delete[] _blocks;
00042         _blocks = 0;
00043     }
00044 }
00045 
00046 int HeapBlockDevice::init()
00047 {
00048     if (!_blocks) {
00049         _blocks = new uint8_t*[_count];
00050         for (size_t i = 0; i < _count; i++) {
00051             _blocks[i] = 0;
00052         }
00053     }
00054 
00055     return BD_ERROR_OK;
00056 }
00057 
00058 int HeapBlockDevice::deinit()
00059 {
00060     // Heapory is lazily cleaned up in destructor to allow
00061     // data to live across de/reinitialization
00062     return BD_ERROR_OK;
00063 }
00064 
00065 bd_size_t HeapBlockDevice::get_read_size() const
00066 {
00067     return _read_size;
00068 }
00069 
00070 bd_size_t HeapBlockDevice::get_program_size() const
00071 {
00072     return _program_size;
00073 }
00074 
00075 bd_size_t HeapBlockDevice::get_erase_size() const
00076 {
00077     return _erase_size;
00078 }
00079 
00080 bd_size_t HeapBlockDevice::size() const
00081 {
00082     return _count * _erase_size;
00083 }
00084 
00085 int HeapBlockDevice::read(void *b, bd_addr_t addr, bd_size_t size)
00086 {
00087     MBED_ASSERT(is_valid_read(addr, size));
00088     uint8_t *buffer = static_cast<uint8_t*>(b);
00089 
00090     while (size > 0) {
00091         bd_addr_t hi = addr / _erase_size;
00092         bd_addr_t lo = addr % _erase_size;
00093 
00094         if (_blocks[hi]) {
00095             memcpy(buffer, &_blocks[hi][lo], _read_size);
00096         } else {
00097             memset(buffer, 0, _read_size);
00098         }
00099 
00100         buffer += _read_size;
00101         addr += _read_size;
00102         size -= _read_size;
00103     }
00104 
00105     return 0;
00106 }
00107 
00108 int HeapBlockDevice::program(const void *b, bd_addr_t addr, bd_size_t size)
00109 {
00110     MBED_ASSERT(is_valid_program(addr, size));
00111     const uint8_t *buffer = static_cast<const uint8_t*>(b);
00112 
00113     while (size > 0) {
00114         bd_addr_t hi = addr / _erase_size;
00115         bd_addr_t lo = addr % _erase_size;
00116 
00117         if (!_blocks[hi]) {
00118             _blocks[hi] = (uint8_t*)malloc(_erase_size);
00119             if (!_blocks[hi]) {
00120                 return BD_ERROR_DEVICE_ERROR;
00121             }
00122         }
00123 
00124         memcpy(&_blocks[hi][lo], buffer, _program_size);
00125 
00126         buffer += _program_size;
00127         addr += _program_size;
00128         size -= _program_size;
00129     }
00130 
00131     return 0;
00132 }
00133 
00134 int HeapBlockDevice::erase(bd_addr_t addr, bd_size_t size)
00135 {
00136     MBED_ASSERT(is_valid_erase(addr, size));
00137     // TODO assert on programming unerased blocks
00138 
00139     return 0;
00140 }
00141