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https://github.com/ibm-s390-linux/s390-tools.git
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1fb859729e
When installing a boot record for "ipl" and "menu" job, always add an environment block as a boot component located in bootmap file at offset alinged on file system block size boundary. When adding, first try to import environment from a file at location specified by newly introduced "--environment" zipl option, or by default at "/etc/ziplenv". If nothing was imported, then add a blank environment block. Optionally print the content of the environment block. Store environment block size and address (as of boot component) in stage3_parms. Change interface of add_ipl_program(): add 2 additional arguments: a pointer to bootmap file name and a predicate indicating if we need to add environment block as a boot component. Reviewed-by: Stefan Haberland <sth@linux.ibm.com> Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com> Signed-off-by: Eduard Shishkin <edward6@linux.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
65 lines
1.3 KiB
C
65 lines
1.3 KiB
C
/*
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* zipl - zSeries Initial Program Loader tool
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*
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* Functions to manipulate with bootmap header
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*
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* Copyright IBM Corp. 2021
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*
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* s390-tools is free software; you can redistribute it and/or modify
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* it under the terms of the MIT license. See LICENSE for details.
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*/
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#include <errno.h>
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#include <string.h>
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#include "bootmap.h"
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#include "error.h"
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#include "misc.h"
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int bootmap_header_init(int fd)
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{
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struct bootmap_header bh = {
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.header_text =
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"zSeries bootmap file\n"
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"created by zIPL\n",
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.version = BOOTMAP_HEADER_VERSION
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};
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return misc_write(fd, &bh, sizeof(bh));
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}
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static int bootmap_header_access(int fd, struct bootmap_header *bh, int read)
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{
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off_t cur_off;
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int ret;
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cur_off = lseek(fd, 0, SEEK_CUR);
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if (cur_off == -1) {
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error_reason(strerror(errno));
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return -1;
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}
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if (lseek(fd, 0, SEEK_SET) == -1) {
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error_reason(strerror(errno));
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ret = -1;
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goto out;
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}
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if (read)
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ret = misc_read(fd, bh, sizeof(*bh));
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else
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ret = misc_write(fd, bh, sizeof(*bh));
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out:
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if (lseek(fd, cur_off, SEEK_SET) == -1)
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return -1;
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return ret;
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}
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int bootmap_header_read(int fd, struct bootmap_header *bh)
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{
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return bootmap_header_access(fd, bh, 1);
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}
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int bootmap_header_write(int fd, struct bootmap_header *bh)
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{
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return bootmap_header_access(fd, bh, 0);
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}
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