pc-bios/s390-ccw: add some utility code
IPL_assert(term,message) is introduced to handle error conditions. ebcdic_to_ascii() to convert chars (mostly to print VOLSERs). read_block() provision for unified block-number handling. Acked-by: NChristian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: NEugene (jno) Dvurechenski <jno@linux.vnet.ibm.com> Reviewed-by: NDavid Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by: NJens Freimann <jfrei@linux.vnet.ibm.com> Signed-off-by: NCornelia Huck <cornelia.huck@de.ibm.com>
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