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f7d2339c6a
Make zipl tool prepare ECKD DASD for booting by different IPL
programs (with the same boot record installed).
Besides standard CCW-type IPL, user gets an ability to trigger
(with the same boot record installed!) List-Directed IPL. This
allows to use the feature of secure boot from ECKD DASD (which
is not available for CCW-type IPL).
When using the old boot interfaces, the usual CCW-type IPL is
triggered for DASD. Also for compatibility reasons zipl(8) tool
is modified to create and install one, or two "similar" program
tables per boot partition, depending on job and disk type. The
"similar" program tables differ only in block pointers format.
The old IPL programs (CCW-type IPL) use program table based on the
old format.
All program tables are packed to the same bootmap file. Their
order and logical offsets in the file are not significant (not
used by anyone).
The picture below shows which program table is used for IPL of
specified type from disk of specified type. Here "0" and "1" are
identifiers of program tables based on the old and new block
pointers format respectively. E.g. program table "0" is used for
CCW-type IPL from ECKD DASD. LD-IPL from DASD FBA is unsupported
(respectively, only one program table "0" is used), etc.
CCW-IPL LD-IPL
SCSI X 0
DASD FBA 0 X
ECKD DASD LDL 0 X
ECKD DASD CDL 0 1
Signed-off-by: Eduard Shishkin <edward6@linux.ibm.com>
Reviewed-by: Stefan Haberland <sth@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
46 lines
894 B
C
46 lines
894 B
C
/*
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* zipl - zSeries Initial Program Loader tool
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*
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* Main program for stage2 bootloader.
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*
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* Copyright IBM Corp. 2013, 2017
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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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#ifndef COMMON_H
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#define COMMON_H
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#include "lib/zt_common.h"
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#define DESCR_PER_BLOCK _AC(16, U)
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#ifndef __ASSEMBLER__
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#include "boot/boot_defs.h"
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#include "libc.h"
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#include "boot/s390.h"
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#include "cio.h"
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#include "error.h"
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typedef union {
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struct eckd_blockptr_legacy eckd;
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struct linear_blockptr linear;
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} disk_blockptr_t;
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struct stage2_descr {
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uint8_t reserved[16];
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} __packed __aligned(8);
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void *load_direct(disk_blockptr_t *, struct subchannel_id , void *);
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int extract_length(void *);
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int is_zero_block(void *);
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void kdump_stage2(unsigned long);
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#endif /* __ASSEMBLER__ */
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#endif /* COMMON_H */
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