Merge remote-tracking branch 'remotes/cody/tags/block-pull-request' into staging
[qemu.git] / pc-bios / s390-ccw / sclp-ascii.c
1 /*
2 * SCLP ASCII access driver
3 *
4 * Copyright (c) 2013 Alexander Graf <agraf@suse.de>
5 *
6 * This work is licensed under the terms of the GNU GPL, version 2 or (at
7 * your option) any later version. See the COPYING file in the top-level
8 * directory.
9 */
10
11 #include "s390-ccw.h"
12 #include "sclp.h"
13
14 static char _sccb[PAGE_SIZE] __attribute__((__aligned__(4096)));
15
16 /* Perform service call. Return 0 on success, non-zero otherwise. */
17 static int sclp_service_call(unsigned int command, void *sccb)
18 {
19 int cc;
20
21 asm volatile(
22 " .insn rre,0xb2200000,%1,%2\n" /* servc %1,%2 */
23 " ipm %0\n"
24 " srl %0,28"
25 : "=&d" (cc) : "d" (command), "a" (__pa(sccb))
26 : "cc", "memory");
27 consume_sclp_int();
28 if (cc == 3)
29 return -EIO;
30 if (cc == 2)
31 return -EBUSY;
32 return 0;
33 }
34
35 static void sclp_set_write_mask(void)
36 {
37 WriteEventMask *sccb = (void *)_sccb;
38
39 sccb->h.length = sizeof(WriteEventMask);
40 sccb->mask_length = sizeof(unsigned int);
41 sccb->receive_mask = SCLP_EVENT_MASK_MSG_ASCII;
42 sccb->cp_receive_mask = SCLP_EVENT_MASK_MSG_ASCII;
43 sccb->send_mask = SCLP_EVENT_MASK_MSG_ASCII;
44 sccb->cp_send_mask = SCLP_EVENT_MASK_MSG_ASCII;
45
46 sclp_service_call(SCLP_CMD_WRITE_EVENT_MASK, sccb);
47 }
48
49 void sclp_setup(void)
50 {
51 sclp_set_write_mask();
52 }
53
54 static int _strlen(const char *str)
55 {
56 int i;
57 for (i = 0; *str; i++)
58 str++;
59 return i;
60 }
61
62 static void _memcpy(char *dest, const char *src, int len)
63 {
64 int i;
65 for (i = 0; i < len; i++)
66 dest[i] = src[i];
67 }
68
69 void sclp_print(const char *str)
70 {
71 int len = _strlen(str);
72 WriteEventData *sccb = (void *)_sccb;
73
74 sccb->h.length = sizeof(WriteEventData) + len;
75 sccb->h.function_code = SCLP_FC_NORMAL_WRITE;
76 sccb->ebh.length = sizeof(EventBufferHeader) + len;
77 sccb->ebh.type = SCLP_EVENT_ASCII_CONSOLE_DATA;
78 sccb->ebh.flags = 0;
79 _memcpy(sccb->data, str, len);
80
81 sclp_service_call(SCLP_CMD_WRITE_EVENT_DATA, sccb);
82 }