bdc7fe3638
We have to consume the outstanding service interrupt after each service call, otherwise a correct implementation will return CC=2 on subsequent service calls. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
83 lines
2.1 KiB
C
83 lines
2.1 KiB
C
/*
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* SCLP ASCII access driver
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*
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* Copyright (c) 2013 Alexander Graf <agraf@suse.de>
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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 "s390-ccw.h"
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#include "sclp.h"
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static char _sccb[PAGE_SIZE] __attribute__((__aligned__(4096)));
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/* Perform service call. Return 0 on success, non-zero otherwise. */
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static int sclp_service_call(unsigned int command, void *sccb)
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{
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int cc;
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asm volatile(
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" .insn rre,0xb2200000,%1,%2\n" /* servc %1,%2 */
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" ipm %0\n"
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" srl %0,28"
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: "=&d" (cc) : "d" (command), "a" (__pa(sccb))
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: "cc", "memory");
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consume_sclp_int();
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if (cc == 3)
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return -EIO;
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if (cc == 2)
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return -EBUSY;
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return 0;
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}
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static void sclp_set_write_mask(void)
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{
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WriteEventMask *sccb = (void *)_sccb;
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sccb->h.length = sizeof(WriteEventMask);
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sccb->mask_length = sizeof(unsigned int);
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sccb->receive_mask = SCLP_EVENT_MASK_MSG_ASCII;
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sccb->cp_receive_mask = SCLP_EVENT_MASK_MSG_ASCII;
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sccb->send_mask = SCLP_EVENT_MASK_MSG_ASCII;
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sccb->cp_send_mask = SCLP_EVENT_MASK_MSG_ASCII;
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sclp_service_call(SCLP_CMD_WRITE_EVENT_MASK, sccb);
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}
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void sclp_setup(void)
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{
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sclp_set_write_mask();
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}
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static int _strlen(const char *str)
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{
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int i;
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for (i = 0; *str; i++)
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str++;
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return i;
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}
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static void _memcpy(char *dest, const char *src, int len)
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{
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int i;
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for (i = 0; i < len; i++)
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dest[i] = src[i];
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}
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void sclp_print(const char *str)
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{
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int len = _strlen(str);
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WriteEventData *sccb = (void *)_sccb;
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sccb->h.length = sizeof(WriteEventData) + len;
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sccb->h.function_code = SCLP_FC_NORMAL_WRITE;
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sccb->ebh.length = sizeof(EventBufferHeader) + len;
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sccb->ebh.type = SCLP_EVENT_ASCII_CONSOLE_DATA;
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sccb->ebh.flags = 0;
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_memcpy(sccb->data, str, len);
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sclp_service_call(SCLP_CMD_WRITE_EVENT_DATA, sccb);
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}
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