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hw/s390x: Build an IPLB for each boot device

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Build an IPLB for any device with a bootindex (up to a maximum of 8 devices).

The IPLB chain is placed immediately before the BIOS in memory. Because this
is not a fixed address, the location of the next IPLB and number of remaining
boot devices is stored in the QIPL global variable for possible later access by
the guest during IPL.

Signed-off-by: Jared Rossi <jrossi@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20241020012953.1380075-16-jrossi@linux.ibm.com>
[thuth: Fix endianness problem when accessing the qipl structure]
Signed-off-by: Thomas Huth <thuth@redhat.com>
This commit is contained in:
Jared Rossi 2024-10-19 21:29:49 -04:00 • committed by Thomas Huth
parent bb185de423
commit 0927875e70
3 changed files with 105 additions and 29 deletions
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1
hw/s390x/ipl.h
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@ -20,6 +20,7 @@
#include "qom/object.h"
#define DIAG308_FLAGS_LP_VALID 0x80
#define MAX_BOOT_DEVS 8 /* Max number of devices that may have a bootindex */
void s390_ipl_convert_loadparm(char *ascii_lp, uint8_t *ebcdic_lp);
void s390_ipl_fmt_loadparm(uint8_t *loadparm, char *str, Error **errp);