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 "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 */
61 static time_t
rtc_time(struct vmctx * ctx,int use_localtime)62 rtc_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
75 void
rtc_init(struct vmctx * ctx,int use_localtime)76 rtc_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
108 static void
rtc_dsdt(void)109 rtc_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 }
125 LPC_DSDT(rtc_dsdt);
126
127 /*
128 * Reserve the extended RTC I/O ports although they are not emulated at this
129 * time.
130 */
131 SYSRES_IO(0x72, 6);
132