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Provisory implementation of MIPS big endian Volume Header production.

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For now it is mutually exclusive with El Torito production.
It will always be mutually exclusive with MBR production.
This commit is contained in:
Thomas Schmitt 2010-10-12 12:20:27 +02:00
parent f12df92600
commit b07d3ab0c3
6 changed files with 155 additions and 10 deletions
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21
libisofs/ecma119.c
View File

@ -1567,6 +1567,8 @@ int ecma119_image_new(IsoImage *src, IsoWriteOpts *opts, Ecma119Image **img)
} else if (src->system_area_data != NULL) {
system_area = src->system_area_data;
system_area_options = src->system_area_options;
} else {
system_area_options = opts->system_area_options & 0xfc;
}
target->system_area_data = NULL;
if (system_area != NULL) {
@ -2614,9 +2616,24 @@ int iso_write_opts_get_data_start(IsoWriteOpts *opts, uint32_t *data_start,
/*
* @param data Either NULL or 32 kB of data. Do not submit less bytes !
* @param options bit0 = apply GRUB protective msdos label
* @param options
* Can cause manipulations of submitted data before they get written:
* bit0= apply a --protective-msdos-label as of grub-mkisofs.
* This means to patch bytes 446 to 512 of the system area so
* that one partition is defined which begins at the second
* 512-byte block of the image and ends where the image ends.
* This works with and without system_area_data.
* bit1= apply isohybrid MBR patching to the system area.
* This works only with system area data from SYSLINUX plus an
* ISOLINUX boot image (see iso_image_set_boot_image()) and
* only if not bit0 is set.
* bit2-7= System area type
* 0= PC-BIOS DOS MBR
* 1= MIPS Big Endian Volume Header
* @param flag bit0 = invalidate any attached system area data
* same as data == NULL
* bit1 = keep data unaltered
* bit2 = keep options unaltered
*/
int iso_write_opts_set_system_area(IsoWriteOpts *opts, char data[32768],
int options, int flag)
@ -2634,7 +2651,7 @@ int iso_write_opts_set_system_area(IsoWriteOpts *opts, char data[32768],
memcpy(opts->system_area_data, data, 32768);
}
if (!(flag & 4))
opts->system_area_options = options & 3;
opts->system_area_options = options & 0xff;
return ISO_SUCCESS;
}

9
libisofs/ecma119.h
View File

@ -481,14 +481,19 @@ struct ecma119_image
*/
char *system_area_data;
/*
* bit0= make bytes 446 - 512 of the system area a partition
* bit0= Only with PC-BIOS DOS MBR
* Make bytes 446 - 512 of the system area a partition
* table which reserves partition 1 from byte 63*512 to the
* end of the ISO image. Assumed are 63 secs/hed, 255 head/cyl.
* (GRUB protective msdos label.)
* This works with and without system_area_data.
* bit1= apply isohybrid MBR patching to the system area.
* bit1= Only with PC-BIOS DOS MBR
* Apply isohybrid MBR patching to the system area.
* This works only with system_area_data plus ISOLINUX boot image
* and only if not bit0 is set.
* bit2-7= System area type
* 0= DOS MBR
* 1= MIPS Big Endian Volume Header
*/
int system_area_options;

12
libisofs/eltorito.c
View File

@ -1091,6 +1091,10 @@ int eltorito_writer_compute_data_blocks(IsoImageWriter *writer)
t = writer->target;
/* >>> Preliminary: No El Torito with system area type other than MBR */
if (t->system_area_options & 0xfc)
return ISO_SUCCESS;
/* Patch the boot image info tables if indicated */
for (idx = 0; idx < t->catalog->num_bootimages; idx++) {
if (!(t->catalog->bootimages[idx]->isolinux_options & 0x01))
@ -1151,6 +1155,10 @@ int eltorito_writer_write_vol_desc(IsoImageWriter *writer)
t = writer->target;
cat = t->catalog;
/* >>> Preliminary: No El Torito with system area type other than MBR */
if (t->system_area_options & 0xfc)
return ISO_SUCCESS;
iso_msg_debug(t->image->id, "Write El-Torito boot record");
memset(&vol, 0, sizeof(struct ecma119_boot_rec_vol_desc));
@ -1225,6 +1233,10 @@ int eltorito_writer_create(Ecma119Image *target)
}
}
/* >>> Preliminary: No El Torito with system area type other than MBR */
if (target->system_area_options & 0xfc)
return ISO_SUCCESS;
/* we need the bootable volume descriptor */
target->curblock++;
return ISO_SUCCESS;

1
libisofs/filesrc.c
View File

@ -11,6 +11,7 @@
#include "../config.h"
#endif
#include "libisofs.h"
#include "filesrc.h"
#include "node.h"
#include "util.h"

15
libisofs/libisofs.h
View File

@ -1755,15 +1755,26 @@ int iso_write_opts_set_fifo_size(IsoWriteOpts *opts, size_t fifo_size);
* Either NULL or 32 kB of data. Do not submit less bytes !
* @param options
* Can cause manipulations of submitted data before they get written:
* bit0= apply a --protective-msdos-label as of grub-mkisofs.
* bit0= Only with System area type 0 = MBR
* Apply a --protective-msdos-label as of grub-mkisofs.
* This means to patch bytes 446 to 512 of the system area so
* that one partition is defined which begins at the second
* 512-byte block of the image and ends where the image ends.
* This works with and without system_area_data.
* bit1= apply isohybrid MBR patching to the system area.
* bit1= Only with System area type 0 = MBR
* Apply isohybrid MBR patching to the system area.
* This works only with system area data from SYSLINUX plus an
* ISOLINUX boot image (see iso_image_set_boot_image()) and
* only if not bit0 is set.
* bit2-7= System area type
* 0= with bit0 or bit1: MBR
* else: unspecified type
* @since 0.6.38
* 1= MIPS Big Endian Volume Header
>>> EXPERIMENTAL:
Submit MIPS boot image files as El Torito Boot image to
iso_image_set_boot_image() , iso_image_add_boot_image().
No El Torito info will be produced with system area type 1.
* @param flag
* bit0 = invalidate any attached system area data. Same as data == NULL
* (This re-activates eventually loaded image System Area data.

107
libisofs/system_area.c
View File

@ -12,6 +12,7 @@
#include "../config.h"
#endif
#include "libisofs.h"
#include "system_area.h"
#include "eltorito.h"
#include "filesrc.h"
@ -208,9 +209,102 @@ int iso_offset_partition_start(uint32_t img_blocks, uint32_t partition_offset,
}
/* This function was implemented according to a byte map which was derived
by Thomas Schmitt from
cdrkit-1.1.10/genisoimage/boot-mips.c by Steve McIntyre which is based
on work of Florian Lohoff and Thiemo Seufer who possibly learned from
documents of MIPS Computer Systems, Inc. and Silicon Graphics Computer
Systems, Inc.
This function itself is entirely under copyright (C) 2010 Thomas Schmitt.
*/
static int make_mips_volume_header(Ecma119Image *t, uint8_t *buf, int flag)
{
char *namept, *name_field;
uint32_t num_cyl, idx, blocks, num, checksum;
off_t image_size;
static uint32_t bps = 512, spt = 32;
memset(buf, 0, 16 * BLOCK_SIZE);
image_size = t->curblock * 2048;
/* 0 - 3 | 0x0be5a941 | Magic number */
iso_msb(buf, 0x0be5a941, 4);
/* 28 - 29 | num_cyl_l | Number of usable cylinder, lower two bytes */
/* >>> Shall i rather orund up ? */
num_cyl = image_size / (bps * spt);
iso_msb(buf + 28, num_cyl & 0xffff, 2);
/* 32 - 33 | 1 | Number of tracks per cylinder */
iso_msb(buf + 32, 1, 2);
/* 35 - 35 | num_cyl_h | Number of usable cylinders, high byte */
buf[35] = (num_cyl >> 16) & 0xff;
/* 38 - 39 | 32 | Sectors per track */
iso_msb(buf + 38, spt, 2);
/* 40 - 41 | 512 | Bytes per sector */
iso_msb(buf + 40, bps, 2);
/* 44 - 47 | 0x00000034 | Controller characteristics */
iso_msb(buf + 44, 0x00000034, 4);
/* 72 - 87 | ========== | Volume Directory Entry 1 */
/* 72 - 79 | boot_name | Boot file basename */
/* 80 - 83 | boot_block | ISO 9660 LBA of boot file * 4 */
/* 84 - 87 | boot_bytes | File length in bytes */
/* 88 - 311 | 0 | Volume Directory Entries 2 to 15 */
for (idx = 0; idx < t->catalog->num_bootimages; idx++) {
/* >>> skip non-MIPS boot images */;
namept = iso_node_get_name(
(IsoNode *) t->catalog->bootimages[idx]->image);
name_field = (char *) (buf + (72 + 16 * idx));
strncpy(name_field, namept, 8);
iso_msb(buf + (72 + 16 * idx) + 8,
t->bootsrc[idx]->sections[0].block * 4, 4);
/* >>> shall i really round up to 2048 ? */
iso_msb(buf + (72 + 16 * idx) + 12,
((t->bootsrc[idx]->sections[0].size + 2047) / 2048 ) * 2048,
4);
}
/* 408 - 411 | part_blks | Number of 512 byte blocks in partition */
blocks = (image_size + bps - 1) / bps;
iso_msb(buf + 408, blocks, 4);
/* 416 - 419 | 0 | Partition is volume header */
iso_msb(buf + 416, 0, 4);
/* 432 - 435 | part_blks | Number of 512 byte blocks in partition */
iso_msb(buf + 432, blocks, 4);
iso_msb(buf + 444, 6, 4);
/* 504 - 507 | head_chk | Volume header checksum
The two's complement of bytes 0 to 503 read
as big endian unsigned 32 bit:
sum(32-bit-words) + head_chk == 0
*/
checksum = 0;
for (idx = 0; idx < 504; idx += 4) {
num = iso_read_msb(buf + idx, 4);
/* Addition modulo a natural number is commutative and associative.
Thus the inverse of a sum is the sum of the inverses of the addends.
*/
checksum -= num;
}
iso_msb(buf + 504, checksum, 4);
return 1;
}
int iso_write_system_area(Ecma119Image *t, uint8_t *buf)
{
int ret, int_img_blocks;
int ret, int_img_blocks, sa_type;
uint32_t img_blocks;
if ((t == NULL) || (buf == NULL)) {
@ -220,12 +314,13 @@ int iso_write_system_area(Ecma119Image *t, uint8_t *buf)
/* set buf to 0s */
memset(buf, 0, 16 * BLOCK_SIZE);
sa_type = (t->system_area_options >> 2) & 0x3f;
img_blocks = t->curblock;
if (t->system_area_data != NULL) {
/* Write more or less opaque boot image */
memcpy(buf, t->system_area_data, 16 * BLOCK_SIZE);
} else if (t->catalog != NULL &&
} else if (sa_type == 0 && t->catalog != NULL &&
(t->catalog->bootimages[0]->isolinux_options & 0x0a) == 0x02) {
/* Check for isolinux image with magic number of 3.72 and produce
an MBR from our built-in template. (Deprecated since 31 Mar 2010)
@ -243,12 +338,12 @@ int iso_write_system_area(Ecma119Image *t, uint8_t *buf)
}
return ISO_SUCCESS;
}
if (t->system_area_options & 1) {
if (sa_type == 0 && (t->system_area_options & 1)) {
/* Write GRUB protective msdos label, i.e. a simple partition table */
ret = make_grub_msdos_label(img_blocks, buf, 0);
if (ret != ISO_SUCCESS) /* error should never happen */
return ISO_ASSERT_FAILURE;
} else if(t->system_area_options & 2) {
} else if(sa_type == 0 && (t->system_area_options & 2)) {
/* Patch externally provided system area as isohybrid MBR */
if (t->catalog == NULL || t->system_area_data == NULL) {
/* isohybrid makes only sense together with ISOLINUX boot image
@ -260,6 +355,10 @@ int iso_write_system_area(Ecma119Image *t, uint8_t *buf)
(uint32_t) 0, 64, 32, 0, 1, 0x17, buf, 1);
if (ret != 1)
return ret;
} else if(sa_type == 1) {
ret = make_mips_volume_header(t, buf, 0);
if (ret != ISO_SUCCESS) /* error should never happen */
return ISO_ASSERT_FAILURE;
} else if(t->partition_offset > 0) {
/* Write a simple partition table. */
ret = make_grub_msdos_label(img_blocks, buf, 2);