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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>
35 lines
1.2 KiB
C
35 lines
1.2 KiB
C
/*
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* s390-tools/zipl/include/bootmap.h
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* Functions to handle environment block.
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*
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* Copyright IBM Corp. 2020
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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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*/
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#include "boot/s390.h" /* for PAGE_SIZE */
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#define ZIPL_ENVBLK_SIGNATURE "# zIPL Environment Block\n"
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#define ENVBLK_DEFAULT_IMPORT_SOURCE "/etc/ziplenv"
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/*
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* The following limit can be increased. It requires modifications
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* of the code, which is responsible for handling environment in
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* stage3, which will increase its memory footprint.
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*/
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#define ENVBLK_MAX_LINES (PAGE_SIZE / 8 /* sizeof(struct env_hash_entry */)
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#define ENVBLK_MAX_IMPORT_SIZE(envblk_size) \
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(envblk_size - sizeof(ZIPL_ENVBLK_SIGNATURE) + 1)
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int envblk_offset_get(int fd, off_t *off);
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int envblk_offset_set(int fd, off_t off);
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int envblk_size_get(int fd, int *size);
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int envblk_check_name(char *name, int len);
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int envblk_import(char *from, char *to, int size);
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char *envblk_next_line(char *s, const char *end);
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int envblk_scan(char *envblk, unsigned int envblk_size,
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void (*actor)(char *name));
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void envblk_print(char *envblk, unsigned int envblk_size);
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void envblk_create_blank(char *envblk, int envblk_len);
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