usr.sbin/bhyve/rtc.c

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