9f4278837d
We are already using the libc from SLOF for the s390-netboot.img, and
this libc implementation is way more complete and accurate than the
simple implementation that we currently use for the s390-ccw.img binary.
Since we are now always assuming that the SLOF submodule is available
when building the s390-ccw bios (see commit bf6903f694), we can drop
the simple implementation and use the SLOF libc for the s390-ccw.img
binary, too.
Additionally replace sclp_print calls with puts/printf now that it is
available.
Co-authored by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Jared Rossi <jrossi@linux.ibm.com>
Message-ID: <20241020012953.1380075-3-jrossi@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
134 lines
3.6 KiB
C
134 lines
3.6 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 <string.h>
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#include "s390-ccw.h"
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#include "sclp.h"
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long write(int fd, const void *str, size_t len);
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static char _sccb[PAGE_SIZE] __attribute__((__aligned__(4096)));
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const unsigned char ebc2asc[256] =
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/* 0123456789abcdef0123456789abcdef */
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"................................" /* 1F */
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"................................" /* 3F */
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" ...........<(+|&.........!$*);." /* 5F first.chr.here.is.real.space */
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"-/.........,%_>?.........`:#@'=\""/* 7F */
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".abcdefghi.......jklmnopqr......" /* 9F */
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"..stuvwxyz......................" /* BF */
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".ABCDEFGHI.......JKLMNOPQR......" /* DF */
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"..STUVWXYZ......0123456789......";/* FF */
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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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void sclp_set_write_mask(uint32_t receive_mask, uint32_t send_mask)
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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->cp_receive_mask = receive_mask;
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sccb->cp_send_mask = send_mask;
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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(0, SCLP_EVENT_MASK_MSG_ASCII);
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}
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long write(int fd, const void *str, size_t len)
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{
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WriteEventData *sccb = (void *)_sccb;
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const char *p = str;
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size_t data_len = 0;
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size_t i;
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if (fd != 1 && fd != 2) {
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return -EIO;
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}
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for (i = 0; i < len; i++) {
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if ((data_len + 1) >= SCCB_DATA_LEN) {
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/* We would overflow the sccb buffer, abort early */
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len = i;
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break;
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}
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if (*p == '\n') {
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/* Terminal emulators might need \r\n, so generate it */
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sccb->data[data_len++] = '\r';
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}
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sccb->data[data_len++] = *p;
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p++;
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}
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sccb->h.length = sizeof(WriteEventData) + data_len;
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sccb->h.function_code = SCLP_FC_NORMAL_WRITE;
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sccb->ebh.length = sizeof(EventBufferHeader) + data_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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sclp_service_call(SCLP_CMD_WRITE_EVENT_DATA, sccb);
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return len;
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}
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void sclp_get_loadparm_ascii(char *loadparm)
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{
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ReadInfo *sccb = (void *)_sccb;
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memset((char *)_sccb, 0, sizeof(ReadInfo));
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sccb->h.length = SCCB_SIZE;
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if (!sclp_service_call(SCLP_CMDW_READ_SCP_INFO, sccb)) {
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ebcdic_to_ascii((char *) sccb->loadparm, loadparm, LOADPARM_LEN);
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}
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}
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int sclp_read(char *str, size_t count)
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{
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ReadEventData *sccb = (void *)_sccb;
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char *buf = (char *)(&sccb->ebh) + 7;
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/* If count exceeds max buffer size, then restrict it to the max size */
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if (count > SCCB_SIZE - 8) {
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count = SCCB_SIZE - 8;
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}
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sccb->h.length = SCCB_SIZE;
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sccb->h.function_code = SCLP_UNCONDITIONAL_READ;
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sclp_service_call(SCLP_CMD_READ_EVENT_DATA, sccb);
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memcpy(str, buf, count);
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return sccb->ebh.length - 7;
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}
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