85 lines
1.9 KiB
C
85 lines
1.9 KiB
C
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/*
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* Ramdisk driver for Tegra X1
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*
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* Copyright (c) 2019-2021 CTCaer
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <string.h>
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#include "ramdisk.h"
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#include <libs/fatfs/diskio.h>
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#include <mem/heap.h>
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#include <utils/types.h>
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#include <memory_map.h>
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static u32 disk_size = 0;
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int ram_disk_init(FATFS *ram_fs, u32 ramdisk_size)
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{
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int res = 0;
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disk_size = ramdisk_size;
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// If ramdisk is not raw, format it.
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if (ram_fs)
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{
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u8 *buf = malloc(0x400000);
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// Set ramdisk size.
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ramdisk_size >>= 9;
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disk_set_info(DRIVE_RAM, SET_SECTOR_COUNT, &ramdisk_size);
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// Unmount ramdisk.
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f_mount(NULL, "ram:", 1);
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// Format as exFAT w/ 32KB cluster with no MBR.
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res = f_mkfs("ram:", FM_EXFAT | FM_SFD, RAMDISK_CLUSTER_SZ, buf, 0x400000);
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// Mount ramdisk.
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if (!res)
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res = f_mount(ram_fs, "ram:", 1);
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free(buf);
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}
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return res;
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}
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int ram_disk_read(u32 sector, u32 sector_count, void *buf)
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{
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u32 sector_off = RAM_DISK_ADDR + (sector << 9);
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u32 bytes_count = sector_count << 9;
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if ((sector_off - RAM_DISK_ADDR) > disk_size)
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return 1;
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memcpy(buf, (void *)sector_off, bytes_count);
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return 0;
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}
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int ram_disk_write(u32 sector, u32 sector_count, const void *buf)
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{
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u32 sector_off = RAM_DISK_ADDR + (sector << 9);
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u32 bytes_count = sector_count << 9;
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if ((sector_off - RAM_DISK_ADDR) > disk_size)
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return 1;
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memcpy((void *)sector_off, buf, bytes_count);
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return 0;
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}
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