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: releng/11.0/usr.sbin/bhyve/rtc.c 279225 2015-02-24 02:04:16Z neel $
27 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD: releng/11.0/usr.sbin/bhyve/rtc.c 279225 2015-02-24 02:04:16Z neel $");
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 */
59static time_t
60rtc_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
73void
74rtc_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
106static void
107rtc_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}
123LPC_DSDT(rtc_dsdt);
124
125/*
126 * Reserve the extended RTC I/O ports although they are not emulated at this
127 * time.
128 */
129SYSRES_IO(0x72, 6);
130