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