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TOMOYO Linux Cross Reference
Linux/arch/alpha/boot/tools/mkbb.c

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  1 /* This utility makes a bootblock suitable for the SRM console/miniloader */
  2 
  3 /* Usage:
  4  *      mkbb <device> <lxboot>
  5  *
  6  * Where <device> is the name of the device to install the bootblock on,
  7  * and <lxboot> is the name of a bootblock to merge in.  This bootblock
  8  * contains the offset and size of the bootloader.  It must be exactly
  9  * 512 bytes long.
 10  */
 11 
 12 #include <fcntl.h>
 13 #include <unistd.h>
 14 #include <stdlib.h>
 15 #include <stdio.h>
 16 
 17 /* Minimal definition of disklabel, so we don't have to include
 18  * asm/disklabel.h (confuses make)
 19  */
 20 #ifndef MAXPARTITIONS
 21 #define MAXPARTITIONS   8                       /* max. # of partitions */
 22 #endif
 23 
 24 #ifndef u8
 25 #define u8 unsigned char
 26 #endif
 27 
 28 #ifndef u16
 29 #define u16 unsigned short
 30 #endif
 31 
 32 #ifndef u32
 33 #define u32 unsigned int
 34 #endif
 35 
 36 struct disklabel {
 37     u32 d_magic;                                /* must be DISKLABELMAGIC */
 38     u16 d_type, d_subtype;
 39     u8  d_typename[16];
 40     u8  d_packname[16];
 41     u32 d_secsize;
 42     u32 d_nsectors;
 43     u32 d_ntracks;
 44     u32 d_ncylinders;
 45     u32 d_secpercyl;
 46     u32 d_secprtunit;
 47     u16 d_sparespertrack;
 48     u16 d_sparespercyl;
 49     u32 d_acylinders;
 50     u16 d_rpm, d_interleave, d_trackskew, d_cylskew;
 51     u32 d_headswitch, d_trkseek, d_flags;
 52     u32 d_drivedata[5];
 53     u32 d_spare[5];
 54     u32 d_magic2;                               /* must be DISKLABELMAGIC */
 55     u16 d_checksum;
 56     u16 d_npartitions;
 57     u32 d_bbsize, d_sbsize;
 58     struct d_partition {
 59         u32     p_size;
 60         u32     p_offset;
 61         u32     p_fsize;
 62         u8      p_fstype;
 63         u8      p_frag;
 64         u16     p_cpg;
 65     } d_partitions[MAXPARTITIONS];
 66 };
 67 
 68 
 69 typedef union __bootblock {
 70     struct {
 71         char                    __pad1[64];
 72         struct disklabel        __label;
 73     } __u1;
 74     struct {
 75         unsigned long           __pad2[63];
 76         unsigned long           __checksum;
 77     } __u2;
 78     char                bootblock_bytes[512];
 79     unsigned long       bootblock_quadwords[64];
 80 } bootblock;
 81 
 82 #define bootblock_label         __u1.__label
 83 #define bootblock_checksum      __u2.__checksum
 84 
 85 int main(int argc, char ** argv)
 86 {
 87     bootblock           bootblock_from_disk;
 88     bootblock           bootloader_image;
 89     int                 dev, fd;
 90     int                 i;
 91     int                 nread;
 92 
 93     /* Make sure of the arg count */
 94     if(argc != 3) {
 95         fprintf(stderr, "Usage: %s device lxboot\n", argv[0]);
 96         exit(0);
 97     }
 98 
 99     /* First, open the device and make sure it's accessible */
100     dev = open(argv[1], O_RDWR);
101     if(dev < 0) {
102         perror(argv[1]);
103         exit(0);
104     }
105 
106     /* Now open the lxboot and make sure it's reasonable */
107     fd = open(argv[2], O_RDONLY);
108     if(fd < 0) {
109         perror(argv[2]);
110         close(dev);
111         exit(0);
112     }
113 
114     /* Read in the lxboot */
115     nread = read(fd, &bootloader_image, sizeof(bootblock));
116     if(nread != sizeof(bootblock)) {
117         perror("lxboot read");
118         fprintf(stderr, "expected %zd, got %d\n", sizeof(bootblock), nread);
119         exit(0);
120     }
121 
122     /* Read in the bootblock from disk. */
123     nread = read(dev, &bootblock_from_disk, sizeof(bootblock));
124     if(nread != sizeof(bootblock)) {
125         perror("bootblock read");
126         fprintf(stderr, "expected %zd, got %d\n", sizeof(bootblock), nread);
127         exit(0);
128     }
129 
130     /* Swap the bootblock's disklabel into the bootloader */
131     bootloader_image.bootblock_label = bootblock_from_disk.bootblock_label;
132 
133     /* Calculate the bootblock checksum */
134     bootloader_image.bootblock_checksum = 0;
135     for(i = 0; i < 63; i++) {
136         bootloader_image.bootblock_checksum += 
137                         bootloader_image.bootblock_quadwords[i];
138     }
139 
140     /* Write the whole thing out! */
141     lseek(dev, 0L, SEEK_SET);
142     if(write(dev, &bootloader_image, sizeof(bootblock)) != sizeof(bootblock)) {
143         perror("bootblock write");
144         exit(0);
145     }
146 
147     close(fd);
148     close(dev);
149     exit(0);
150 }
151 
152 
153 

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