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120d04103e
Create a separate library for channel i/o related code. This decouples channel i/o operations from virtio and allows us to make use of them for the real dasd boot path. Signed-off-by: Jason J. Herne <jjherne@linux.ibm.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Reviewed-by: Thomas Huth <thuth@redhat.com> Message-Id: <1554388475-18329-6-git-send-email-jjherne@linux.ibm.com> Signed-off-by: Thomas Huth <thuth@redhat.com>
44 lines
991 B
C
44 lines
991 B
C
/*
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* S390 Channel I/O
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*
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* Copyright (c) 2013 Alexander Graf <agraf@suse.de>
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* Copyright (c) 2019 IBM Corp.
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*
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* Author(s): Jason J. Herne <jjherne@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or (at
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* your option) any later version. See the COPYING file in the top-level
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* directory.
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*/
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#include "libc.h"
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#include "s390-ccw.h"
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#include "cio.h"
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static char chsc_page[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE)));
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int enable_mss_facility(void)
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{
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int ret;
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ChscAreaSda *sda_area = (ChscAreaSda *) chsc_page;
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memset(sda_area, 0, PAGE_SIZE);
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sda_area->request.length = 0x0400;
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sda_area->request.code = 0x0031;
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sda_area->operation_code = 0x2;
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ret = chsc(sda_area);
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if ((ret == 0) && (sda_area->response.code == 0x0001)) {
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return 0;
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}
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return -EIO;
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}
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void enable_subchannel(SubChannelId schid)
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{
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Schib schib;
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stsch_err(schid, &schib);
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schib.pmcw.ena = 1;
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msch(schid, &schib);
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}
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