| paul@272 | 1 | /* |
| paul@272 | 2 | * A memory card region accessor. |
| paul@272 | 3 | * |
| paul@272 | 4 | * Copyright (C) 2021, 2024 Paul Boddie <paul@boddie.org.uk> |
| paul@272 | 5 | * |
| paul@272 | 6 | * This program is free software; you can redistribute it and/or |
| paul@272 | 7 | * modify it under the terms of the GNU General Public License as |
| paul@272 | 8 | * published by the Free Software Foundation; either version 2 of |
| paul@272 | 9 | * the License, or (at your option) any later version. |
| paul@272 | 10 | * |
| paul@272 | 11 | * This program is distributed in the hope that it will be useful, |
| paul@272 | 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| paul@272 | 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| paul@272 | 14 | * GNU General Public License for more details. |
| paul@272 | 15 | * |
| paul@272 | 16 | * You should have received a copy of the GNU General Public License |
| paul@272 | 17 | * along with this program; if not, write to the Free Software |
| paul@272 | 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| paul@272 | 19 | * Boston, MA 02110-1301, USA |
| paul@272 | 20 | */ |
| paul@272 | 21 | |
| paul@272 | 22 | #include <string.h> |
| paul@272 | 23 | |
| paul@272 | 24 | #include <algorithm> |
| paul@272 | 25 | |
| paul@272 | 26 | #include "msc_region_accessor.h" |
| paul@272 | 27 | |
| paul@272 | 28 | |
| paul@272 | 29 | |
| paul@272 | 30 | MscRegionAccessor::MscRegionAccessor(MscRegionOperations *ops, |
| paul@272 | 31 | uint32_t start_block, uint32_t num_blocks, |
| paul@272 | 32 | fileid_t fileid) |
| paul@272 | 33 | : Accessor(fileid), _ops(ops) |
| paul@272 | 34 | { |
| paul@272 | 35 | // NOTE: Block size assumption employed. |
| paul@272 | 36 | |
| paul@272 | 37 | _start = start_block * 512; |
| paul@272 | 38 | _size = num_blocks * 512; |
| paul@272 | 39 | } |
| paul@272 | 40 | |
| paul@272 | 41 | /* Return the size of the file. */ |
| paul@272 | 42 | |
| paul@272 | 43 | offset_t MscRegionAccessor::get_size() |
| paul@272 | 44 | { |
| paul@272 | 45 | return _size; |
| paul@272 | 46 | } |
| paul@272 | 47 | |
| paul@272 | 48 | /* Update the size of the file. */ |
| paul@272 | 49 | |
| paul@272 | 50 | void MscRegionAccessor::set_size(offset_t size) |
| paul@272 | 51 | { |
| paul@272 | 52 | (void) size; |
| paul@272 | 53 | } |
| paul@272 | 54 | |
| paul@272 | 55 | /* Data transfer helper methods. */ |
| paul@272 | 56 | |
| paul@272 | 57 | /* Fill the populated portion of a flexpage. */ |
| paul@272 | 58 | |
| paul@272 | 59 | void MscRegionAccessor::fill_populated(Flexpage *flexpage) |
| paul@272 | 60 | { |
| paul@272 | 61 | offset_t filepos = flexpage->base_offset; |
| paul@272 | 62 | offset_t populated_size = std::min(flexpage->size, _size - filepos); |
| paul@272 | 63 | |
| paul@272 | 64 | /* Tag the region with file state. */ |
| paul@272 | 65 | |
| paul@272 | 66 | flexpage->region->fill(fileid, filepos); |
| paul@272 | 67 | |
| paul@272 | 68 | /* Fill the region with file content. */ |
| paul@272 | 69 | |
| paul@272 | 70 | _ops->read(flexpage->base_addr, flexpage->base_addr_physical, |
| paul@272 | 71 | _start + filepos, populated_size); |
| paul@272 | 72 | |
| paul@272 | 73 | /* Pad the flexpage with zero. */ |
| paul@272 | 74 | |
| paul@272 | 75 | if (populated_size < flexpage->size) |
| paul@272 | 76 | memset((void *) (flexpage->base_addr + populated_size), 0, |
| paul@272 | 77 | flexpage->size - populated_size); |
| paul@272 | 78 | } |
| paul@272 | 79 | |
| paul@272 | 80 | /* Flush the populated portion of a flexpage. */ |
| paul@272 | 81 | |
| paul@272 | 82 | void MscRegionAccessor::flush_populated(Flexpage *flexpage) |
| paul@272 | 83 | { |
| paul@272 | 84 | offset_t filepos = flexpage->base_offset; |
| paul@272 | 85 | offset_t populated_size = std::min(flexpage->size, _size - filepos); |
| paul@272 | 86 | |
| paul@272 | 87 | /* Remove the file state tag from the region. */ |
| paul@272 | 88 | |
| paul@272 | 89 | flexpage->region->flush(); |
| paul@272 | 90 | |
| paul@272 | 91 | /* Flush the file content. */ |
| paul@272 | 92 | |
| paul@272 | 93 | _ops->write(flexpage->base_addr, flexpage->base_addr_physical, |
| paul@272 | 94 | _start + filepos, populated_size); |
| paul@272 | 95 | } |
| paul@272 | 96 | |
| paul@272 | 97 | // vim: tabstop=4 expandtab shiftwidth=4 |
