92 lines
2.3 KiB
C
92 lines
2.3 KiB
C
/*
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* Copyright (c) 2016 Intel Corporation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <string.h>
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#include <stdint.h>
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#include <misc/__assert.h>
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#include <disk_access.h>
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#include <errno.h>
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#define RAMDISK_SECTOR_SIZE 512
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#if defined(CONFIG_USB_MASS_STORAGE)
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/* A 16KB initialized RAMdisk which will fit on most target's RAM. It
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* is initialized with a valid file system for validating USB mass storage.
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*/
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#include "fat12_ramdisk.h"
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#else
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/* A 96KB RAM Disk, which meets ELM FAT fs's minimum block requirement. Fit for
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* qemu testing (as it may exceed target's RAM limits).
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*/
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#define RAMDISK_VOLUME_SIZE (192 * RAMDISK_SECTOR_SIZE)
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static uint8_t ramdisk_buf[RAMDISK_VOLUME_SIZE];
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#endif
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static void *lba_to_address(uint32_t lba)
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{
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__ASSERT(((lba * RAMDISK_SECTOR_SIZE) < RAMDISK_VOLUME_SIZE),
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"FS bound error");
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return &ramdisk_buf[(lba * RAMDISK_SECTOR_SIZE)];
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}
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int disk_access_status(void)
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{
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return DISK_STATUS_OK;
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}
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int disk_access_init(void)
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{
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return 0;
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}
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int disk_access_read(uint8_t *buff, uint32_t sector, uint32_t count)
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{
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memcpy(buff, lba_to_address(sector), count * RAMDISK_SECTOR_SIZE);
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return 0;
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}
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int disk_access_write(const uint8_t *buff, uint32_t sector, uint32_t count)
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{
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memcpy(lba_to_address(sector), buff, count * RAMDISK_SECTOR_SIZE);
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return 0;
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}
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int disk_access_ioctl(uint8_t cmd, void *buff)
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{
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switch (cmd) {
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case DISK_IOCTL_CTRL_SYNC:
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break;
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case DISK_IOCTL_GET_SECTOR_COUNT:
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*(uint32_t *) buff = RAMDISK_VOLUME_SIZE / RAMDISK_SECTOR_SIZE;
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break;
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case DISK_IOCTL_GET_SECTOR_SIZE:
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*(uint32_t *) buff = RAMDISK_SECTOR_SIZE;
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break;
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case DISK_IOCTL_GET_ERASE_BLOCK_SZ:
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*(uint32_t *) buff = 1;
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break;
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case DISK_IOCTL_GET_DISK_SIZE:
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*(uint32_t *) buff = RAMDISK_VOLUME_SIZE;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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