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/*
* 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 "libc.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;
}
static void sclp_set_write_mask(void)
{
WriteEventMask *sccb = (void *)_sccb;
sccb->h.length = sizeof(WriteEventMask);
sccb->mask_length = sizeof(unsigned int);
sccb->receive_mask = SCLP_EVENT_MASK_MSG_ASCII;
sccb->cp_receive_mask = SCLP_EVENT_MASK_MSG_ASCII;
sccb->send_mask = SCLP_EVENT_MASK_MSG_ASCII;
sccb->cp_send_mask = SCLP_EVENT_MASK_MSG_ASCII;
sclp_service_call(SCLP_CMD_WRITE_EVENT_MASK, sccb);
}
void sclp_setup(void)
{
sclp_set_write_mask();
}
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_print(const char *str)
{
write(1, str, strlen(str));
}
void sclp_get_loadparm_ascii(char *loadparm)
{
ReadInfo *sccb = (void *)_sccb;
memset((char *)_sccb, 0, sizeof(ReadInfo));
sccb->h.length = sizeof(ReadInfo);
if (!sclp_service_call(SCLP_CMDW_READ_SCP_INFO, sccb)) {
ebcdic_to_ascii((char *) sccb->loadparm, loadparm, 8);
}
}
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;
}
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