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https://github.com/ibm-s390-linux/s390-tools.git
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e764f460c4
The binary Linux kernel image is built to be loaded to memory address 0x0 but the first 64 kbyte contain an IPL header that is not used for disk IPL. zIPL strips away this IPL header when writing IPL records to disk, loads the remaining data to memory address 0x10000 and uses the memory area below that for its own boot loader code. The Secure Boot firmware feature checks the integrity of an installed image during IPL using a checksum that was generated for the full image. Since the checksum becomes invalid if the IPL header is removed, zIPL must be changed to write the full image to disk. This patch modifies the zIPL logic to no longer strip away the IPL header. Instead the full image is loaded to a higher memory address and relocated by the stage 3 boot loader code to its final location. Signed-off-by: Stefan Haberland <sth@linux.ibm.com> Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
45 lines
1.3 KiB
C
45 lines
1.3 KiB
C
/*
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* zipl - zSeries Initial Program Loader tool
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*
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* Main program for stage3 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 STAGE3_H
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#define STAGE3_H
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#include "libc.h"
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#include "s390.h"
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#define IPL_DEVICE 0x10404
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#define INITRD_START 0x10408
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#define INITRD_SIZE 0x10410
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#define OLDMEM_BASE 0x10418
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#define OLDMEM_SIZE 0x10420
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#define COMMAND_LINE 0x10480
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#define COMMAND_LINE_SIZE 896
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#define COMMAND_LINE_EXTRA (0xA000-0x400)
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#define STAGE3_FLAG_SCSI 0x0001000000000000ULL
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#define STAGE3_FLAG_KDUMP 0x0002000000000000ULL
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#define KERNEL_HEADER_SIZE 65536
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#define UNSPECIFIED_ADDRESS -1ULL
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extern unsigned long long _parm_addr; /* address of parmline */
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extern unsigned long long _initrd_addr; /* address of initrd */
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extern unsigned long long _initrd_len; /* length of initrd */
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extern unsigned long long _load_psw; /* load psw of kernel */
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extern unsigned long long _extra_parm; /* use extra parm line mechanism? */
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extern unsigned long long stage3_flags; /* flags (e.g. STAGE3_FLAG_KDUMP) */
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extern unsigned long long _image_len; /* length of kernel */
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extern unsigned long long _image_addr; /* target address of kernel */
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extern void kdump_stage3();
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#endif /* STAGE3_H */
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