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mountRAW.c
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/*
* ATARI ST HDC Emulator
*
* File: mountraw.c
* Author: Steve Bradford
* Created: September 2022
*
* PICO hardware initialisation
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <pico/stdlib.h>
#include "sdcard/sd_card.h"
#include "emu.h"
#define HDC_ReadInt32(a, i) (((unsigned) a[i] << 24) | ((unsigned) a[i + 1] << 16) | ((unsigned) a[i + 2] << 8) | a[i + 3])
extern DRIVES drv[];
int rawPartitionCount ( sd_card_t *pdrv )//DRIVES *pdrv )
{
unsigned char *pinfo, bootsector[512];
uint32_t start, sectors, total = 0;
int i, parts = 0;
int lba = 0;
if ( ( i = sd_read_blocks ( pdrv, bootsector, lba, 1 ) ) != SD_BLOCK_DEVICE_ERROR_NONE )
{
printf( "rawPartitionCount: read error %d\n", i );
return 0;
}
/* read MBR partition table
* this is in the first sector (512 bytes) of the volume
* if byte 0 is not equal to 0 then a boot programme resides
* partition info starts at the following offsets, each is 16 bytes long
* partition 1 at byte 446 (0x01be)
* partition 2 at byte 462
* partition 3 at byte 478
* partition 4 at byte 494
* byte offset 510 (0x01fe) should read 0xaa55 = valid MBR
*
*/
if ( bootsector [0x01fe] == 0x55 && bootsector [0x01ff] == 0xaa )
{
int ptype, boot;
/* first partition table entry */
pinfo = bootsector + 0x1be;
for ( i = 0; i < MAX_MBR_PARTS; i++, pinfo += 16 )
{
boot = pinfo [0]; /* uint8_t - 0x00 = not bootable, 0x80 = bootable */
ptype = pinfo [4]; /* uint8_t - partition type
* 0x00: Blank entry. Any other field must be zero.
* 0x01: FAT12 (CHS/LBA, < 65536 sectors)
* 0x04: FAT16 (CHS/LBA, < 65536 sectors)
* 0x05: Extended partition (CHS/LBA)
* 0x06: FAT12/16 (CHS/LBA, >= 65536 sectors)
* 0x07: HPFS/NTFS/exFAT (CHS/LBA)
* 0x0B: FAT32 (CHS/LBA)
* 0x0C: FAT32 (LBA)
* 0x0E: FAT12/16 (LBA)
* 0x0F: Extended partition (LBA)
*/
start = ((uint32_t)pinfo [11] << 24) | ((uint32_t)pinfo [10] << 16) | ((uint32_t)pinfo [9] << 8) | pinfo [8]; /* partition start sector in 32bit LBA format */
sectors = ((uint32_t)pinfo [15] << 24) | ((uint32_t)pinfo [14] << 16) | ((uint32_t)pinfo [13] << 8) | pinfo [12]; /* partition size in sectors */
if ( ptype && (ptype != 0x05 && ptype != 0x0f) )
{
total += sectors;
printf ( "DOS MBR - Partition %d: type=0x%02x, start=0x%08x, size=%.1f MB %s%s\n",
i, ptype, start, sectors/2048.0, boot ? "(boot)" : "", sectors ? "" : "(invalid)");
parts++;
}
//#ifdef TODO
/* check extended boot records (if any) */
if ( ptype == 0x0f || ptype == 0x05 )
{
uint8_t extpart [512];
char *ep = (extpart + 0x1be);
uint8_t epboot, eptype;
uint32_t epstart, epsectors;
if ( ( i = sd_read_blocks ( pdrv, extpart, start, 1 ) ) != SD_BLOCK_DEVICE_ERROR_NONE )
{
printf ( "2nd read failed %d\n", i );
return 0;
}
if ( extpart [0x01fe] == 0x55 && extpart [0x01ff] == 0xaa )
{
for ( int p = 0; p < 4; p++, ep += 16 )
{
epboot = ep [0];
eptype = ep [4];
epstart = (((uint32_t)ep [11] << 24) | ((uint32_t)ep [10] << 16) | ((uint32_t)ep [9] << 8) | ep [8]) + start; /* partition start sector in 32bit LBA format */
epsectors = ((uint32_t)ep [15] << 24) | ((uint32_t)ep [14] << 16) | ((uint32_t)ep [13] << 8) | ep [12];
if ( eptype && eptype != 0x05 )
{
total += epsectors;
printf ( "DOS EBR - Extended Partition %d: type=0x%02x, start=0x%08x, size=%.1f MB %s%s\n",
parts, eptype, epstart, epsectors/2048.0, epboot ? "(boot)" : "", epsectors ? "" : "(invalid)");
parts++;
}
if ( eptype == 0x05 )
{
uint8_t eextpart [512];
char *epp = (eextpart + 0x1be);
uint8_t eepboot, eeptype;
uint32_t eepstart, eepsectors;
if ( ( i = sd_read_blocks ( pdrv, eextpart, epstart, 1 ) ) != SD_BLOCK_DEVICE_ERROR_NONE )
{
printf ( "2nd read failed %d\n", i );
return 0;
}
if ( eextpart [0x01fe] == 0x55 && eextpart [0x01ff] == 0xaa )
{
for ( int p = 0; p < 4; p++, epp += 16 )
{
eepboot = epp [0];
eeptype = epp [4];
eepstart = (((uint32_t)epp [11] << 24) | ((uint32_t)epp [10] << 16) | ((uint32_t)epp [9] << 8) | epp [8]) + epstart; /* partition start sector in 32bit LBA format */
eepsectors = ((uint32_t)epp [15] << 24) | ((uint32_t)epp [14] << 16) | ((uint32_t)epp [13] << 8) | epp [12];
if ( eeptype )
{
total += eepsectors;
printf ( "DOS EBR - Extended Partition %d: type=0x%02x, start=0x%08x, size=%.1f MB %s%s\n",
parts, eeptype, eepstart, eepsectors/2048.0, eepboot ? "(boot)" : "", eepsectors ? "" : "(invalid)");
parts++;
}
}
}
}
}
}
}
//#endif
}
if ( parts )
{
//pdrv->diskSize = total;
printf( "Total size: %.1f MB in %d partitions\n", total/2048.0, parts);
}
}
else
{
/* Partition table contains hd size + 4 partition entries
* (composed of flag byte, 3 char ID, start offset
* and size), this is followed by bad sector list +
* count and the root sector checksum. Before this
* there's the boot code.
*/
char c, pid[4];
int j, flags;
bool extended;
pinfo = bootsector + 0x1C6;
for (i = 0; i < MAX_MBR_PARTS; i++, pinfo += 12)
{
flags = pinfo[0];
if (flags & 0x1)
{
for (j = 0; j < 3; j++)
{
c = pinfo[j+1];
if (c < 32 || c >= 127)
c = '.';
pid[j] = c;
}
pid[3] = '\0';
extended = strcmp("XGM", pid) == 0;
printf( "ATARI MBR "
"- Partition %d: ID=%s, start=0x%08x, size=%.1f MB, flags=0x%x %s%s\n",
parts, pid,
HDC_ReadInt32(pinfo, 4),
HDC_ReadInt32(pinfo, 8) / 2048.0,
flags,
(flags & 0x80) ? "(boot)": "",
extended ? "(extended)" : "");
parts++;
}
}
if ( parts )
{
total = HDC_ReadInt32(bootsector, 0x1C2);
//pdrv->diskSize = total;
printf ( "- Total size: %.1f MB in %d partitions\n", total / 2048.0, parts );
}
}
//if ( parts )
//{
pdrv->mounted = true;
//pdrv->mounted = true;
// pdrv->raw = true; /* raw partioned */
//}
//else
//{
// pdrv->mounted = false;
// pdrv->raw = false;
//}
//pdrv->partTotal = parts;
return total;
}
extern sd_card_t sd_cards[];
int mountRAW ( int disk )
{
int t = 0;
int status;
sd_card_t *pdrv;
//for ( int n = 0; n < MAX_DRIVES; n++ )
//{
drv [disk].pSD = &sd_cards [disk];
pdrv = drv [disk].pSD;
if ( gpio_get (pdrv->card_detect_gpio) == false && pdrv->mounted == false ) /* check micro-sd card is inserted */
{
sleep_ms (1);
if ( (status = sd_init_card ( pdrv ) ) == 0 )
{
drv [disk].diskSize = rawPartitionCount ( pdrv );
printf ( "%s diskSize = %d\n", __func__, drv [disk].diskSize );
if ( pdrv->mounted )
{
printf ( "\n%s mounted\n\n", pdrv->pcName );
t++;
}
}
else
{
printf ( "\nERROR: mountRAW init card failed on %s\n", pdrv->pcName );
}
}
//}
return t; /* return number of mounted drives */
}