From e6d393d097ac09c9146772a829fff1bfaf61eb9d Mon Sep 17 00:00:00 2001 From: Janosch Frank Date: Wed, 24 Jun 2020 03:52:18 -0400 Subject: pc-bios: s390x: Get rid of magic offsets into the lowcore If we have a lowcore struct that has members for offsets that we want to touch, why not use it? Signed-off-by: Janosch Frank Reviewed-by: David Hildenbrand Reviewed-by: Thomas Huth Reviewed-by: Cornelia Huck Message-Id: <20200624075226.92728-5-frankja@linux.ibm.com> Signed-off-by: Thomas Huth --- pc-bios/s390-ccw/cio.h | 17 +++++++++++------ pc-bios/s390-ccw/main.c | 8 +++----- 2 files changed, 14 insertions(+), 11 deletions(-) diff --git a/pc-bios/s390-ccw/cio.h b/pc-bios/s390-ccw/cio.h index aaa432d..1e5d4e9 100644 --- a/pc-bios/s390-ccw/cio.h +++ b/pc-bios/s390-ccw/cio.h @@ -122,12 +122,17 @@ typedef struct schib { } __attribute__ ((packed, aligned(4))) Schib; typedef struct subchannel_id { - __u32 cssid:8; - __u32:4; - __u32 m:1; - __u32 ssid:2; - __u32 one:1; - __u32 sch_no:16; + union { + struct { + __u16 cssid:8; + __u16 reserved:4; + __u16 m:1; + __u16 ssid:2; + __u16 one:1; + }; + __u16 sch_id; + }; + __u16 sch_no; } __attribute__ ((packed, aligned(4))) SubChannelId; struct chsc_header { diff --git a/pc-bios/s390-ccw/main.c b/pc-bios/s390-ccw/main.c index 4e65b41..8b91245 100644 --- a/pc-bios/s390-ccw/main.c +++ b/pc-bios/s390-ccw/main.c @@ -36,11 +36,9 @@ LowCore *lowcore; /* Yes, this *is* a pointer to address 0 */ */ void write_subsystem_identification(void) { - SubChannelId *schid = (SubChannelId *) 184; - uint32_t *zeroes = (uint32_t *) 188; - - *schid = blk_schid; - *zeroes = 0; + lowcore->subchannel_id = blk_schid.sch_id; + lowcore->subchannel_nr = blk_schid.sch_no; + lowcore->io_int_parm = 0; } void write_iplb_location(void) -- cgit v1.1