hw/ppc/spapr_rtc.c

   1 /*
   2  * QEMU PowerPC pSeries Logical Partition (aka sPAPR) hardware System Emulator
   3  *
   4  * RTAS Real Time Clock
   5  *
   6  * Copyright (c) 2010-2011 David Gibson, IBM Corporation.
   7  * Copyright 2014 David Gibson, Red Hat.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a copy
  10  * of this software and associated documentation files (the "Software"), to deal
  11  * in the Software without restriction, including without limitation the rights
  12  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  13  * copies of the Software, and to permit persons to whom the Software is
  14  * furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included in
  17  * all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  22  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  23  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  24  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  25  * THE SOFTWARE.
  26  *
  27  */
  28 #include "cpu.h"
  29 #include "hw/ppc/spapr.h"
  30 #include "qapi-event.h"
  31
  32 static void rtas_get_time_of_day(PowerPCCPU *cpu, sPAPREnvironment *spapr,
  33                                  uint32_t token, uint32_t nargs,
  34                                  target_ulong args,
  35                                  uint32_t nret, target_ulong rets)
  36 {
  37     struct tm tm;
  38
  39     if (nret != 8) {
  40         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
  41         return;
  42     }
  43
  44     qemu_get_timedate(&tm, spapr->rtc_offset);
  45
  46     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
  47     rtas_st(rets, 1, tm.tm_year + 1900);
  48     rtas_st(rets, 2, tm.tm_mon + 1);
  49     rtas_st(rets, 3, tm.tm_mday);
  50     rtas_st(rets, 4, tm.tm_hour);
  51     rtas_st(rets, 5, tm.tm_min);
  52     rtas_st(rets, 6, tm.tm_sec);
  53     rtas_st(rets, 7, 0); /* we don't do nanoseconds */
  54 }
  55
  56 static void rtas_set_time_of_day(PowerPCCPU *cpu, sPAPREnvironment *spapr,
  57                                  uint32_t token, uint32_t nargs,
  58                                  target_ulong args,
  59                                  uint32_t nret, target_ulong rets)
  60 {
  61     struct tm tm;
  62
  63     tm.tm_year = rtas_ld(args, 0) - 1900;
  64     tm.tm_mon = rtas_ld(args, 1) - 1;
  65     tm.tm_mday = rtas_ld(args, 2);
  66     tm.tm_hour = rtas_ld(args, 3);
  67     tm.tm_min = rtas_ld(args, 4);
  68     tm.tm_sec = rtas_ld(args, 5);
  69
  70     /* Just generate a monitor event for the change */
  71     qapi_event_send_rtc_change(qemu_timedate_diff(&tm), &error_abort);
  72     spapr->rtc_offset = qemu_timedate_diff(&tm);
  73
  74     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
  75 }
  76
  77 void spapr_rtc_init(void)
  78 {
  79     spapr_rtas_register(RTAS_GET_TIME_OF_DAY, "get-time-of-day",
  80                         rtas_get_time_of_day);
  81     spapr_rtas_register(RTAS_SET_TIME_OF_DAY, "set-time-of-day",
  82                         rtas_set_time_of_day);
  83 }