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2013-04-02T05:10:31Z

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;boot label 세팅에 관한 bootblock.h 파일의 참고정보

아래 내용은 bootblock.h 파일의 일부분을 발췌한 내용이다.

한글로 달려있는 주석부분을 잘 참고하도록 한다.

<syntaxhighlight lang="c">
#define NEXT68K_LABEL_MAXPARTITIONS 8 /* number of partitions in next68k_disklabel */
#define NEXT68K_LABEL_CPULBLLEN 24
#define NEXT68K_LABEL_MAXDNMLEN 24
#define NEXT68K_LABEL_MAXTYPLEN 24
#define NEXT68K_LABEL_MAXBFLEN 24
#define NEXT68K_LABEL_MAXHNLEN 32
#define NEXT68K_LABEL_MAXMPTLEN 16
#define NEXT68K_LABEL_MAXFSTLEN 8
#define NEXT68K_LABEL_NBAD 1670 /* sized to make label ~= 8KB */

struct next68k_partition {
int32_t cp_offset; /* starting sector */
int32_t cp_size; /* number of sectors in partition */
int16_t cp_bsize; /* block size in bytes */
int16_t cp_fsize; /* filesystem basic fragment size */
char cp_opt; /* optimization type: 's'pace/'t'ime */
char cp_pad1;
int16_t cp_cpg; /* filesystem cylinders per group */
int16_t cp_density; /* bytes per inode density */
int8_t cp_minfree; /* minfree (%) */
int8_t cp_newfs; /* run newfs during init */
char cp_mountpt[NEXT68K_LABEL_MAXMPTLEN];
/* default/standard mount point */
int8_t cp_automnt; /* auto-mount when inserted */
char cp_type[NEXT68K_LABEL_MAXFSTLEN]; /* file system type name */
char cp_pad2;
} __packed;

/* The disklabel the way it is on the disk */
struct next68k_disklabel {
int32_t cd_version; /* label version */
int32_t cd_label_blkno; /* block # of this label */ <- 첫번째 변경할 바이트 offset 0x5 ~ 0x08 ( 실제로는 4 바이트의 끝자리니까 0x8 을 변경해야함)
int32_t cd_size; /* size of media area (sectors) */
char cd_label[NEXT68K_LABEL_CPULBLLEN]; /* disk name (label) */
uint32_t cd_flags; /* flags */
uint32_t cd_tag; /* volume tag */
char cd_name[NEXT68K_LABEL_MAXDNMLEN]; /* drive (hardware) name */
char cd_type[NEXT68K_LABEL_MAXTYPLEN]; /* drive type */
int32_t cd_secsize; /* # of bytes per sector */
int32_t cd_ntracks; /* # of tracks per cylinder */
int32_t cd_nsectors; /* # of data sectors per track */
int32_t cd_ncylinders; /* # of data cylinders per unit */
int32_t cd_rpm; /* rotational speed */
int16_t cd_front; /* # of sectors in "front porch" */ <- offset 0x70
int16_t cd_back; /* # of sectors in "back porch" */ <- offset 0x72
int16_t cd_ngroups; /* # of alt groups */
int16_t cd_ag_size; /* alt group size (sectors) */
int16_t cd_ag_alts; /* alternate sectors / alt group */
int16_t cd_ag_off; /* sector offset to first alternate */
int32_t cd_boot_blkno[2]; /* boot program locations */ <- 두번째변경할바이트 offset 0x7c
char cd_kernel[NEXT68K_LABEL_MAXBFLEN]; /* default kernel name */ <- 세번째변경할바이트 offset 0x84
char cd_hostname[NEXT68K_LABEL_MAXHNLEN];
/* host name (usu. where disk was labeled) */
char cd_rootpartition; /* root partition letter e.g. 'a' */
char cd_rwpartition; /* r/w partition letter e.g. 'b' */
struct next68k_partition cd_partitions[NEXT68K_LABEL_MAXPARTITIONS];

union {
uint16_t CD_v3_checksum; /* label version 3 checksum */ <- 네번째 변경바이트 offset 0x22e(위의 cd_version 에 따라 dlV3 인경우)
int32_t CD_bad[NEXT68K_LABEL_NBAD];
/* block number that is bad */
} cd_un;
uint16_t cd_checksum; /* label version 1 or 2 checksum */ <- 네번째 변경바이트 offset 0x1c46 (위의 cd_version 에 따라 NeXT 또는 dlV2 인경우)
} __packed;

#define NEXT68K_LABEL_cd_checksum cd_checksum
#define NEXT68K_LABEL_cd_v3_checksum cd_un.CD_v3_checksum
#define NEXT68K_LABEL_cd_bad cd_un.CD_bad

#define NEXT68K_LABEL_SECTOR 0 /* sector containing label */
#define NEXT68K_LABEL_OFFSET 0 /* offset of label in sector */
#define NEXT68K_LABEL_SIZE 8192 /* size of label */
#define NEXT68K_LABEL_CD_V1 0x4e655854 /* version #1: "NeXT" */
#define NEXT68K_LABEL_CD_V2 0x646c5632 /* version #2: "dlV2" */
#define NEXT68K_LABEL_CD_V3 0x646c5633 /* version #3: "dlV3" */
#define NEXT68K_LABEL_DEFAULTFRONTPORCH (160 * 2)
#define NEXT68K_LABEL_DEFAULTBOOT0_1 (32 * 2)
#define NEXT68K_LABEL_DEFAULTBOOT0_2 (96 * 2)
</syntaxhighlight>

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