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/*
* S390 Channel I/O
*
* Copyright (c) 2013 Alexander Graf <agraf@suse.de>
* Copyright (c) 2019 IBM Corp.
*
* Author(s): Jason J. Herne <jjherne@us.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or (at
* your option) any later version. See the COPYING file in the top-level
* directory.
*/
#include "libc.h"
#include "s390-ccw.h"
#include "cio.h"
static char chsc_page[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE)));
int enable_mss_facility(void)
{
int ret;
ChscAreaSda *sda_area = (ChscAreaSda *) chsc_page;
memset(sda_area, 0, PAGE_SIZE);
sda_area->request.length = 0x0400;
sda_area->request.code = 0x0031;
sda_area->operation_code = 0x2;
ret = chsc(sda_area);
if ((ret == 0) && (sda_area->response.code == 0x0001)) {
return 0;
}
return -EIO;
}
void enable_subchannel(SubChannelId schid)
{
Schib schib;
stsch_err(schid, &schib);
schib.pmcw.ena = 1;
msch(schid, &schib);
}
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