rtc.c revision 330449 
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: stable/11/usr.sbin/bhyve/rtc.c 330449 2018-03-05 07:26:05Z eadler $
29 */
30
31#include <sys/cdefs.h>
32__FBSDID("$FreeBSD: stable/11/usr.sbin/bhyve/rtc.c 330449 2018-03-05 07:26:05Z eadler $");
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 "pci_lpc.h"
44#include "rtc.h"
45
46#define	IO_RTC		0x70
47
48#define	RTC_LMEM_LSB	0x34
49#define	RTC_LMEM_MSB	0x35
50#define	RTC_HMEM_LSB	0x5b
51#define	RTC_HMEM_SB	0x5c
52#define	RTC_HMEM_MSB	0x5d
53
54#define m_64KB		(64*1024)
55#define	m_16MB		(16*1024*1024)
56#define	m_4GB		(4ULL*1024*1024*1024)
57
58/*
59 * Returns the current RTC time as number of seconds since 00:00:00 Jan 1, 1970
60 */
61static time_t
62rtc_time(struct vmctx *ctx, int use_localtime)
63{
64	struct tm tm;
65	time_t t;
66
67	time(&t);
68	if (use_localtime) {
69		localtime_r(&t, &tm);
70		t = timegm(&tm);
71	}
72	return (t);
73}
74
75void
76rtc_init(struct vmctx *ctx, int use_localtime)
77{
78	size_t himem;
79	size_t lomem;
80	int err;
81
82	/* XXX init diag/reset code/equipment/checksum ? */
83
84	/*
85	 * Report guest memory size in nvram cells as required by UEFI.
86	 * Little-endian encoding.
87	 * 0x34/0x35 - 64KB chunks above 16MB, below 4GB
88	 * 0x5b/0x5c/0x5d - 64KB chunks above 4GB
89	 */
90	lomem = (vm_get_lowmem_size(ctx) - m_16MB) / m_64KB;
91	err = vm_rtc_write(ctx, RTC_LMEM_LSB, lomem);
92	assert(err == 0);
93	err = vm_rtc_write(ctx, RTC_LMEM_MSB, lomem >> 8);
94	assert(err == 0);
95
96	himem = vm_get_highmem_size(ctx) / m_64KB;
97	err = vm_rtc_write(ctx, RTC_HMEM_LSB, himem);
98	assert(err == 0);
99	err = vm_rtc_write(ctx, RTC_HMEM_SB, himem >> 8);
100	assert(err == 0);
101	err = vm_rtc_write(ctx, RTC_HMEM_MSB, himem >> 16);
102	assert(err == 0);
103
104	err = vm_rtc_settime(ctx, rtc_time(ctx, use_localtime));
105	assert(err == 0);
106}
107
108static void
109rtc_dsdt(void)
110{
111
112	dsdt_line("");
113	dsdt_line("Device (RTC)");
114	dsdt_line("{");
115	dsdt_line("  Name (_HID, EisaId (\"PNP0B00\"))");
116	dsdt_line("  Name (_CRS, ResourceTemplate ()");
117	dsdt_line("  {");
118	dsdt_indent(2);
119	dsdt_fixed_ioport(IO_RTC, 2);
120	dsdt_fixed_irq(8);
121	dsdt_unindent(2);
122	dsdt_line("  })");
123	dsdt_line("}");
124}
125LPC_DSDT(rtc_dsdt);
126
127/*
128 * Reserve the extended RTC I/O ports although they are not emulated at this
129 * time.
130 */
131SYSRES_IO(0x72, 6);
132