usr/src/cmd/bhyve/rtc.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 2011 NetApp, Inc.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  *
  28  * $FreeBSD$
  29  */
  30
  31 #include <sys/cdefs.h>
  32 __FBSDID("$FreeBSD$");
  33
  34 #include <sys/types.h>
  35
  36 #include <time.h>
  37 #include <assert.h>
  38
  39 #include <machine/vmm.h>
  40 #include <vmmapi.h>
  41
  42 #include "acpi.h"
  43 #include "config.h"
  44 #include "pci_lpc.h"
  45 #include "rtc.h"
  46
  47 #define IO_RTC          0x70
  48
  49 #define RTC_LMEM_LSB    0x34
  50 #define RTC_LMEM_MSB    0x35
  51 #define RTC_HMEM_LSB    0x5b
  52 #define RTC_HMEM_SB     0x5c
  53 #define RTC_HMEM_MSB    0x5d
  54
  55 #define m_64KB          (64*1024)
  56 #define m_16MB          (16*1024*1024)
  57 #define m_4GB           (4ULL*1024*1024*1024)
  58
  59 /*
  60  * Returns the current RTC time as number of seconds since 00:00:00 Jan 1, 1970
  61  */
  62 static time_t
  63 rtc_time(void)
  64 {
  65         struct tm tm;
  66         time_t t;
  67
  68         time(&t);
  69         if (get_config_bool_default("rtc.use_localtime", true)) {
  70                 localtime_r(&t, &tm);
  71                 t = timegm(&tm);
  72         }
  73         return (t);
  74 }
  75
  76 void
  77 rtc_init(struct vmctx *ctx)
  78 {
  79         size_t himem;
  80         size_t lomem;
  81         int err;
  82
  83         /* XXX init diag/reset code/equipment/checksum ? */
  84
  85         /*
  86          * Report guest memory size in nvram cells as required by UEFI.
  87          * Little-endian encoding.
  88          * 0x34/0x35 - 64KB chunks above 16MB, below 4GB
  89          * 0x5b/0x5c/0x5d - 64KB chunks above 4GB
  90          */
  91         lomem = (vm_get_lowmem_size(ctx) - m_16MB) / m_64KB;
  92         err = vm_rtc_write(ctx, RTC_LMEM_LSB, lomem);
  93         assert(err == 0);
  94         err = vm_rtc_write(ctx, RTC_LMEM_MSB, lomem >> 8);
  95         assert(err == 0);
  96
  97         himem = vm_get_highmem_size(ctx) / m_64KB;
  98         err = vm_rtc_write(ctx, RTC_HMEM_LSB, himem);
  99         assert(err == 0);
 100         err = vm_rtc_write(ctx, RTC_HMEM_SB, himem >> 8);
 101         assert(err == 0);
 102         err = vm_rtc_write(ctx, RTC_HMEM_MSB, himem >> 16);
 103         assert(err == 0);
 104
 105         err = vm_rtc_settime(ctx, rtc_time());
 106         assert(err == 0);
 107 }
 108
 109 static void
 110 rtc_dsdt(void)
 111 {
 112
 113         dsdt_line("");
 114         dsdt_line("Device (RTC)");
 115         dsdt_line("{");
 116         dsdt_line("  Name (_HID, EisaId (\"PNP0B00\"))");
 117         dsdt_line("  Name (_CRS, ResourceTemplate ()");
 118         dsdt_line("  {");
 119         dsdt_indent(2);
 120         dsdt_fixed_ioport(IO_RTC, 2);
 121         dsdt_fixed_irq(8);
 122         dsdt_unindent(2);
 123         dsdt_line("  })");
 124         dsdt_line("}");
 125 }
 126 LPC_DSDT(rtc_dsdt);
 127
 128 /*
 129  * Reserve the extended RTC I/O ports although they are not emulated at this
 130  * time.
 131  */
 132 SYSRES_IO(0x72, 6);