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zipl: Extend DASD stand-alone dumpers to drop zero pages

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Update zipl DASD standalone dumpers for single-volume, multi-volume and FBA
to drop the sets of zero pages when dumping memory to disk. Thus, all
continuous sets of zero-megabytes in the memory are dropped during the dump
stage.

Signed-off-by: Mikhail Zaslonko <zaslonko@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Mikhail Zaslonko
2015-12-03 08:47:25 +01:00
committed by Jan Höppner
parent 54519b4465
commit ac0ac48f6f
8 changed files with 341 additions and 95 deletions
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zipl/src/install.c
+2 -2
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@@ -3,7 +3,7 @@
*
* Functions handling the installation of the boot loader code onto disk
*
* Copyright IBM Corp. 2001, 2017
* Copyright IBM Corp. 2001, 2018
*
* s390-tools is free software; you can redistribute it and/or modify
* it under the terms of the MIT license. See LICENSE for details.
@@ -636,7 +636,7 @@ overwrite_partition_start(int fd, struct disk_info* info, int mv_dump_magic)
unsigned int bytes = 65536;
char* buffer;
const char dump_magic[] = {0xa8, 0x19, 0x01, 0x73,
0x61, 0x8f, 0x23, 0xfd};
0x61, 0x8f, 0x23, 0xfe};
if (misc_seek(fd, info->geo.start * info->phy_block_size))
return -1;