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zipl: do not overwrite BOOT_IMAGE entry

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The zipl internal loader adds a variable BOOT_IMAGE= to the commandline
so that it is visible in the operating system which menu entry has been
chosen.

This entry was overwritten by the stage3 parameter page.

Fix by re-arranging the internal memory layout and putting the command
line extra param, which contains the BOOT_IMAGE entry, at 0xe000.
This location is available because less than  one page is used for the
stack.

Fixes: https://github.com/ibm-s390-tools/s390-tools/issues/67
Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Stefan Haberland
2019-07-17 17:26:40 +02:00
committed by Jan Höppner
parent 99ab2db6ad
commit 8bf5f8d0e2
4 changed files with 6 additions and 5 deletions
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zipl/boot/stage3.h
+1 -1
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@@ -22,7 +22,7 @@
#define OLDMEM_SIZE 0x10420
#define COMMAND_LINE 0x10480
#define COMMAND_LINE_SIZE 896
#define COMMAND_LINE_EXTRA (0xA000-0x400)
#define COMMAND_LINE_EXTRA 0xE000
#define STAGE3_FLAG_SCSI 0x0001000000000000ULL
#define STAGE3_FLAG_KDUMP 0x0002000000000000ULL