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Userdata export: export settings on a FAT16 filesystem.

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This commit is contained in:
Ari Sundholm 2020-11-16 23:25:50 +02:00
parent 015f63ddff
commit 8068542da1
5 changed files with 6102 additions and 5722 deletions
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1
software/sys_controller/Makefile
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@ -159,6 +159,7 @@ C_SRCS += ossc/av_controller.c
C_SRCS += ossc/avconfig.c
C_SRCS += ossc/controls.c
C_SRCS += ossc/firmware.c
C_SRCS += ossc/fat16_export.c
ifeq ($(OSDLANG),JP)
C_SRCS += ossc/menu_sjis.c
else

11569
software/sys_controller/mem_init/sys_onchip_memory2_0.hex
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File diff suppressed because it is too large Load Diff

138
software/sys_controller/ossc/fat16_export.c Normal file
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@ -0,0 +1,138 @@
//
// Copyright (C) 2020 Ari Sundholm <megari@iki.fi>
//
// This file has been contributed to the Open Source Scan Converter project
// developed by Markus Hiienkari Markus Hiienkari <mhiienka@niksula.hut.fi>
// and other members of the retro gaming community.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
#include <string.h>
#include "fat16_export.h"
/*
* The beginning of the boot sector. Will be followed by the BPB.
* Offsets 0x000 to 0x00a, inclusive.
*/
static const alt_u8 bootsec_before_bpb_16[11] = {
0xeb, 0x00, 0x90, 0x4d, 0x53, 0x57, 0x49, 0x4e, 0x34, 0x2e, 0x31,
/* ^-----------^--- Maybe zero these? */
};
/* The BPB will span offsets 0x00b to 0x23, inclusive. Will be generated. */
/*
* The rest of the boot sector before the boot code and terminator.
* Offsets 0x024 to 0x03d, inclusive.
*/
static const alt_u8 bootsec_after_bpb_16[26] = {
0x80, 0x00, 0x29, 0xf4, 0xcf, 0xc6, 0x04, 0x4f, 0x53, 0x53, 0x43, 0x50,
0x52, 0x4f, 0x46, 0x49, 0x4c, 0x53, 0x46, 0x41, 0x54, 0x31, 0x36, 0x20,
0x20, 0x20,
};
/*
* After this, we have the boot code (448 bytes) and sector terminator
* (2 bytes). These will be generated.
*/
/* Generates a FAT16 boot sector.
* buf must be at least FAT16_SECTOR_SIZE bytes long,
* and is assumed to be pre-zeroed.
*/
void generate_boot_sector_16(alt_u8 *const buf) {
/* Initial FAT16 boot sector contents. */
memcpy(buf, bootsec_before_bpb_16, 11);
/* BPB */
buf[12] = 0x02;
buf[13] = 0x04;
buf[14] = 0x80;
buf[16] = 0x02;
buf[18] = 0x08;
buf[20] = 0x80;
buf[21] = 0xf8;
buf[22] = 0x20;
buf[24] = 0x3f;
buf[26] = 0xff;
/*
* Then the rest of the boot sector.
* The boot code is just 448 bytes of 0xf4.
*/
memcpy(buf + 36, bootsec_after_bpb_16, 26);
memset(buf + 62, 0xf4, 448);
buf[510] = 0x55;
buf[511] = 0xaa;
}
/* The fixed 'preamble' of a FAT on a FAT16 volume. */
static const alt_u8 fat16_preamble[4] = {
0xf8, 0xff, 0xff, 0xff,
};
#if 0
/*
* To generate each FAT, we need 1040 bytes of memory.
* The buffer is assumed to be zeroed out.
* XXX: This is a problem!
*/
#define FAT16_ALLOC_SIZE 0x420U
#endif
/*
* Generate a FAT.
* The buffer is assumed to be zeroed out and have a size of at least
* FAT16_SECTOR_SIZE bytes.
* The number of clusters already written is given as an argument.
* The function returns the total number of clusters written so far.
*
* The intention is to be able to generate and write the FAT in chunks
* that do not exhaust all the remaining RAM.
*/
alt_u16 generate_fat16(alt_u8 *const fat, const alt_u16 written) {
alt_u16 cur_ofs = 0;
const alt_u16 start_cluster = 3U + written;
const alt_u16 clusters_to_write = !written
? ((FAT16_SECTOR_SIZE - sizeof(fat16_preamble)) >> FAT16_ENTRY_SHIFT)
: (((514U - written) > (512U >> FAT16_ENTRY_SHIFT))
? (512U >> FAT16_ENTRY_SHIFT)
: (514U - written));
const alt_u16 end_cluster = start_cluster + clusters_to_write;
if (!written) {
memcpy(fat, fat16_preamble, sizeof(fat16_preamble));
cur_ofs += sizeof(fat16_preamble);
}
for (alt_u16 cluster = start_cluster; cluster < end_cluster; ++cluster) {
/* FAT16 entries are 16-bit little-endian. */
fat[cur_ofs++] = cluster & 0xffU;
fat[cur_ofs++] = (cluster >> 8U) & 0xffU;
}
/* After the last cluster, write the chain terminator. */
if (end_cluster == 514U) {
fat[cur_ofs++] = 0xff;
fat[cur_ofs++] = 0xff;
}
return end_cluster;
}
const alt_u8 prof_dirent_16[PROF_DIRENT_16_SIZE] = {
0x4f, 0x53, 0x53, 0x43, 0x50, 0x52, 0x4f, 0x46, 0x42, 0x49, 0x4e, 0x20,
0x00, 0x8e, 0x04, 0xb5, 0x6f, 0x51, 0x6f, 0x51, 0x00, 0x00, 0x17, 0x89,
0x6f, 0x51, 0x02, 0x00, 0x00, 0x00, 0x10, 0x00,
};

76
software/sys_controller/ossc/fat16_export.h Normal file
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@ -0,0 +1,76 @@
//
// Copyright (C) 2020 Ari Sundholm <megari@iki.fi>
//
// This file has been contributed to the Open Source Scan Converter project
// developed by Markus Hiienkari Markus Hiienkari <mhiienka@niksula.hut.fi>
// and other members of the retro gaming community.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
#ifndef FAT16_EXPORT_H_
#define FAT16_EXPORT_H_
#include "alt_types.h"
/* Use a sector size of 512 bytes. */
#define FAT16_SECTOR_SIZE 512U
//#define FAT16_BOOT_SECTOR_SIZE FAT16_SECTOR_SIZE
/* This volume has 2048-byte clusters. */
#define FAT16_CLUSTER_SIZE 2048U
/* Offsets of the two File Allocation Tables. */
#define FAT16_1_OFS 0x10000UL
#define FAT16_2_OFS 0x14000UL
/* Each FAT16 entry is a 16-bit little-endian integer. */
#define FAT16_ENTRY_SIZE 2U
#define FAT16_ENTRY_SHIFT 1
/* On this volume, each FAT will be 16 kiB in size. */
#define FAT16_SIZE 0x4000U
/*
* Define the properties and contents of the directory entry for the
* settings file.
*/
#define PROF_DIRENT_16_OFS 0x18000UL
#define PROF_DIRENT_16_SIZE 32UL
extern const alt_u8 prof_dirent_16[PROF_DIRENT_16_SIZE];
#define PROF_16_DATA_OFS 0x028000UL
#define PROF_16_DATA_SIZE 0x100000UL
/* Profile file data starts at offset 0x00028000 */
/* Profile file data ends at offset 0x00128000 */
/* Profile file data is exactly 1 MiB long. */
/* Generate a FAT16 boot sector.
* buf must be at least FAT16_BOOT_SECTOR_SIZE bytes long,
* and is assumed to be pre-zeroed.
*/
void generate_boot_sector_16(alt_u8 *buf);
/*
* Generate a FAT of a FAT16 volume.
* The buffer is assumed to be zeroed out and have a size of at least 512 bytes.
* The number of clusters already written are given as an argument.
* The function returns the total number of clusters written so far.
*/
alt_u16 generate_fat16(alt_u8 *fat, alt_u16 written);
#endif // FAT16_EXPORT_H_

40
software/sys_controller/ossc/userdata.c
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@ -21,6 +21,7 @@
#include <string.h>
#include <unistd.h>
#include "userdata.h"
#include "fat16_export.h"
#include "flash.h"
#include "sdcard.h"
#include "firmware.h"
@ -413,8 +414,45 @@ eval_button:
strncpy(menu_row2, "Exporting...", LCD_ROW_LEN+1);
ui_disp_menu(2);
/* TODO: write FAT */
_Static_assert(SD_BLK_SIZE == FAT16_SECTOR_SIZE, "Sector size mismatch");
/* Generate and write the boot sector. */
memset(databuf, 0, SD_BLK_SIZE); /* Must be at least 512 bytes! */
generate_boot_sector_16(databuf);
SD_Write(&sdcard_dev, databuf, 0);
/* ERROR HANDLING */
/* Generate and write the file allocation tables. */
for (alt_u16 clusters_written = 0, sd_blk_idx = 0;
clusters_written < (PROF_16_DATA_SIZE/FAT16_CLUSTER_SIZE);)
{
alt_u16 count;
memset(databuf, 0, SD_BLK_SIZE); /* Must be at least 512 bytes! */
count = generate_fat16(databuf, clusters_written);
SD_Write(&sdcard_dev, databuf,
(FAT16_1_OFS/SD_BLK_SIZE) + sd_blk_idx);
/* ERROR HANDLING */
SD_Write(&sdcard_dev, databuf,
(FAT16_2_OFS/SD_BLK_SIZE) + sd_blk_idx);
/* ERROR HANDLING */
++sd_blk_idx;
clusters_written += count;
}
/* Write the directory entry of the settings file. */
memset(databuf, 0, SD_BLK_SIZE);
memcpy(databuf, prof_dirent_16, PROF_DIRENT_16_SIZE);
SD_Write(&sdcard_dev, databuf, PROF_DIRENT_16_OFS/SD_BLK_SIZE);
/* ERROR HANDLING */
/* This may wear the SD card a bit more than necessary... */
retval = copy_flash_to_sd(USERDATA_OFFSET/PAGESIZE, 512/SD_BLK_SIZE, (MAX_USERDATA_ENTRY + 1) * SECTORSIZE, databuf);
retval = copy_flash_to_sd(USERDATA_OFFSET/PAGESIZE,
PROF_16_DATA_OFS/SD_BLK_SIZE,
(MAX_USERDATA_ENTRY + 1) * SECTORSIZE,
databuf);
out:
SPI_CS_High();