1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
|
/*
* SCLP ASCII access driver
*
* Copyright (c) 2013 Alexander Graf <agraf@suse.de>
*
* 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 <string.h>
#include "s390-ccw.h"
#include "sclp.h"
long write(int fd, const void *str, size_t len);
static char _sccb[PAGE_SIZE] __attribute__((__aligned__(4096)));
const unsigned char ebc2asc[256] =
/* 0123456789abcdef0123456789abcdef */
"................................" /* 1F */
"................................" /* 3F */
" ...........<(+|&.........!$*);." /* 5F first.chr.here.is.real.space */
"-/.........,%_>?.........`:#@'=\""/* 7F */
".abcdefghi.......jklmnopqr......" /* 9F */
"..stuvwxyz......................" /* BF */
".ABCDEFGHI.......JKLMNOPQR......" /* DF */
"..STUVWXYZ......0123456789......";/* FF */
/* Perform service call. Return 0 on success, non-zero otherwise. */
static int sclp_service_call(unsigned int command, void *sccb)
{
int cc;
asm volatile(
" .insn rre,0xb2200000,%1,%2\n" /* servc %1,%2 */
" ipm %0\n"
" srl %0,28"
: "=&d" (cc) : "d" (command), "a" (__pa(sccb))
: "cc", "memory");
consume_sclp_int();
if (cc == 3)
return -EIO;
if (cc == 2)
return -EBUSY;
return 0;
}
void sclp_set_write_mask(uint32_t receive_mask, uint32_t send_mask)
{
WriteEventMask *sccb = (void *)_sccb;
sccb->h.length = sizeof(WriteEventMask);
sccb->mask_length = sizeof(unsigned int);
sccb->cp_receive_mask = receive_mask;
sccb->cp_send_mask = send_mask;
sclp_service_call(SCLP_CMD_WRITE_EVENT_MASK, sccb);
}
void sclp_setup(void)
{
sclp_set_write_mask(0, SCLP_EVENT_MASK_MSG_ASCII);
}
long write(int fd, const void *str, size_t len)
{
WriteEventData *sccb = (void *)_sccb;
const char *p = str;
size_t data_len = 0;
size_t i;
if (fd != 1 && fd != 2) {
return -EIO;
}
for (i = 0; i < len; i++) {
if ((data_len + 1) >= SCCB_DATA_LEN) {
/* We would overflow the sccb buffer, abort early */
len = i;
break;
}
if (*p == '\n') {
/* Terminal emulators might need \r\n, so generate it */
sccb->data[data_len++] = '\r';
}
sccb->data[data_len++] = *p;
p++;
}
sccb->h.length = sizeof(WriteEventData) + data_len;
sccb->h.function_code = SCLP_FC_NORMAL_WRITE;
sccb->ebh.length = sizeof(EventBufferHeader) + data_len;
sccb->ebh.type = SCLP_EVENT_ASCII_CONSOLE_DATA;
sccb->ebh.flags = 0;
sclp_service_call(SCLP_CMD_WRITE_EVENT_DATA, sccb);
return len;
}
void sclp_get_loadparm_ascii(char *loadparm)
{
ReadInfo *sccb = (void *)_sccb;
memset((char *)_sccb, 0, sizeof(ReadInfo));
sccb->h.length = SCCB_SIZE;
if (!sclp_service_call(SCLP_CMDW_READ_SCP_INFO, sccb)) {
ebcdic_to_ascii((char *) sccb->loadparm, loadparm, LOADPARM_LEN);
}
}
int sclp_read(char *str, size_t count)
{
ReadEventData *sccb = (void *)_sccb;
char *buf = (char *)(&sccb->ebh) + 7;
/* If count exceeds max buffer size, then restrict it to the max size */
if (count > SCCB_SIZE - 8) {
count = SCCB_SIZE - 8;
}
sccb->h.length = SCCB_SIZE;
sccb->h.function_code = SCLP_UNCONDITIONAL_READ;
sclp_service_call(SCLP_CMD_READ_EVENT_DATA, sccb);
memcpy(str, buf, count);
return sccb->ebh.length - 7;
}
|
