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/*
* Copyright (c) 2010 Samsung Electronics Co., Ltd.
* http://www.samsung.com/
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define BLOCK_SIZE 512
#define BLOCK_END 0xFFFFFFFF
#define _10MB (10*1024*1024)
#define _100MB (100*1024*1024)
#define _8_4GB (1023*254*63)
#define CHS_MODE 0
#define LBA_MODE !(CHS_MODE)
typedef struct
{
int C_start;
int H_start;
int S_start;
int C_end;
int H_end;
int S_end;
int available_block;
int unit;
int total_block_count;
int addr_mode; // LBA_MODE or CHS_MODE
} SDInfo;
typedef struct
{
unsigned char bootable;
unsigned char partitionId;
int C_start;
int H_start;
int S_start;
int C_end;
int H_end;
int S_end;
int block_start;
int block_count;
int block_end;
} PartitionInfo;
/////////////////////////////////////////////////////////////////
int calc_unit(int length, SDInfo sdInfo)
{
if (sdInfo.addr_mode == CHS_MODE)
return ( (length / BLOCK_SIZE / sdInfo.unit + 1 ) * sdInfo.unit);
else
return ( (length / BLOCK_SIZE) );
}
/////////////////////////////////////////////////////////////////
void encode_chs(int C, int H, int S, unsigned char *result)
{
*result++ = (unsigned char) H;
*result++ = (unsigned char) ( S + ((C & 0x00000300) >> 2) );
*result = (unsigned char) (C & 0x000000FF);
}
/////////////////////////////////////////////////////////////////
void encode_partitionInfo(PartitionInfo partInfo, unsigned char *result)
{
*result++ = partInfo.bootable;
encode_chs(partInfo.C_start, partInfo.H_start, partInfo.S_start, result);
result +=3;
*result++ = partInfo.partitionId;
encode_chs(partInfo.C_end, partInfo.H_end, partInfo.S_end, result);
result += 3;
*((int *)result) = partInfo.block_start;
result += 4;
*((int *)result) = partInfo.block_count;
}
/////////////////////////////////////////////////////////////////
void get_SDInfo(int block_count, SDInfo *sdInfo)
{
int C, H, S;
int C_max = 1023, H_max = 255, S_max = 63;
int H_start = 1, S_start = 1;
int diff_min = 0, diff = 0;
if(block_count >= _8_4GB)
sdInfo->addr_mode = LBA_MODE;
else
sdInfo->addr_mode = CHS_MODE;
if (sdInfo->addr_mode == CHS_MODE)
{
diff_min = C_max;
for (H = H_start; H <= H_max; H++)
for (S = S_start; S <= S_max; S++)
{
C = block_count / (H * S);
if ( (C <= C_max) )
{
diff = C_max - C;
if (diff <= diff_min)
{
diff_min = diff;
sdInfo->C_end = C;
sdInfo->H_end = H;
sdInfo->S_end = S;
}
}
}
}
else
{
sdInfo->C_end = 1023;
sdInfo->H_end = 254;
sdInfo->S_end = 63;
}
sdInfo->C_start = 0;
sdInfo->H_start = 1;
sdInfo->S_start = 1;
sdInfo->total_block_count = block_count;
sdInfo->available_block = sdInfo->C_end * sdInfo->H_end * sdInfo->S_end;
sdInfo->unit = sdInfo->H_end * sdInfo->S_end;
}
/////////////////////////////////////////////////////////////////
void make_partitionInfo(int LBA_start, int count, SDInfo sdInfo, PartitionInfo *partInfo)
{
int temp = 0;
int _10MB_unit;
partInfo->block_start = LBA_start;
if (sdInfo.addr_mode == CHS_MODE)
{
partInfo->C_start = partInfo->block_start / (sdInfo.H_end * sdInfo.S_end);
temp = partInfo->block_start % (sdInfo.H_end * sdInfo.S_end);
partInfo->H_start = temp / sdInfo.S_end;
partInfo->S_start = temp % sdInfo.S_end + 1;
if (count == BLOCK_END)
{
_10MB_unit = calc_unit(_10MB, sdInfo);
partInfo->block_end = sdInfo.C_end * sdInfo.H_end * sdInfo.S_end - _10MB_unit - 1;
partInfo->block_count = partInfo->block_end - partInfo->block_start + 1;
partInfo->C_end = partInfo->block_end / sdInfo.unit;
partInfo->H_end = sdInfo.H_end - 1;
partInfo->S_end = sdInfo.S_end;
}
else
{
partInfo->block_count = count;
partInfo->block_end = partInfo->block_start + count - 1;
partInfo->C_end = partInfo->block_end / sdInfo.unit;
temp = partInfo->block_end % sdInfo.unit;
partInfo->H_end = temp / sdInfo.S_end;
partInfo->S_end = temp % sdInfo.S_end + 1;
}
}
else
{
partInfo->C_start = 0;
partInfo->H_start = 1;
partInfo->S_start = 1;
partInfo->C_end = 1023;
partInfo->H_end = 254;
partInfo->S_end = 63;
if (count == BLOCK_END)
{
_10MB_unit = calc_unit(_10MB, sdInfo);
partInfo->block_end = sdInfo.total_block_count - _10MB_unit - 1;
partInfo->block_count = partInfo->block_end - partInfo->block_start + 1;
}
else
{
partInfo->block_count = count;
partInfo->block_end = partInfo->block_start + count - 1;
}
}
}
/////////////////////////////////////////////////////////////////
int get_sd_block_count(char *devicefile)
{
FILE *fp;
char buf[128];
int block_count = 0;
int nbytes = 0;
char *t = "/sys/block/";
char sd_size_file[64];
strcpy(sd_size_file, t);
strcat(sd_size_file, &devicefile[5]);
strcat(sd_size_file, "/size");
fp = fopen(sd_size_file, "rb");
nbytes = fread(buf, 1, 128, fp);
fclose(fp);
block_count = atoi(buf);
return block_count;
}
/////////////////////////////////////////////////////////////////
int main(int argc, char *argv[])
{
FILE *fp;
int total_block_count;
int block_start = 0, block_offset = 0;
SDInfo sdInfo;
PartitionInfo partInfo[4];
unsigned char mbr[512];
if (argc != 2)
{
printf("Usage: sd_fdisk <device_file>\n");
return -1;
}
///////////////////////////////////////////////////////////
memset((unsigned char *)&sdInfo, 0x00, sizeof(SDInfo));
///////////////////////////////////////////////////////////
total_block_count = get_sd_block_count(argv[1]);
get_SDInfo(total_block_count, &sdInfo);
/*
///////////////////////////////////////////////////////////
// 반드시 Unit단위로 먼저 계산한다.
block_start = calc_unit(_10MB, sdInfo);
block_offset = calc_unit(_100MB, sdInfo);
///////////////////////////////////////////////////////////
partInfo[0].bootable = 0x00;
partInfo[0].partitionId = 0x83;
make_partitionInfo(block_start, block_offset, sdInfo, &partInfo[0]);
///////////////////////////////////////////////////////////
block_start += block_offset;
partInfo[1].bootable = 0x00;
partInfo[1].partitionId = 0x83;
make_partitionInfo(block_start, block_offset, sdInfo, &partInfo[1]);
///////////////////////////////////////////////////////////
block_start += block_offset;
partInfo[2].bootable = 0x00;
partInfo[2].partitionId = 0x83;
make_partitionInfo(block_start, block_offset, sdInfo, &partInfo[2]);
*/
///////////////////////////////////////////////////////////
// block_start += block_offset;
block_start = calc_unit(_10MB, sdInfo);
block_offset += BLOCK_END;
partInfo[3].bootable = 0x00;
partInfo[3].partitionId = 0x0C;
make_partitionInfo(block_start, BLOCK_END, sdInfo, &partInfo[3]);
///////////////////////////////////////////////////////////
memset(mbr, 0x00, sizeof(mbr));
mbr[510] = 0x55; mbr[511] = 0xAA;
// encode_partitionInfo(partInfo[0], &mbr[0x1CE]);
// encode_partitionInfo(partInfo[1], &mbr[0x1DE]);
// encode_partitionInfo(partInfo[2], &mbr[0x1EE]);
encode_partitionInfo(partInfo[3], &mbr[0x1BE]);
fp = fopen("sd_mbr.dat", "wb");
fwrite(mbr, 1, sizeof(mbr), fp);
fclose(fp);
return 0;
}
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