1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
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
29
30 #include <sys/types.h>
31
32 #include <time.h>
33 #include <assert.h>
34
35 #include <machine/vmm.h>
36 #include <vmmapi.h>
37
38 #include "acpi.h"
39 #include "config.h"
40 #include "pci_lpc.h"
41 #include "rtc.h"
42
43 #define IO_RTC 0x70
44
45 #define RTC_LMEM_LSB 0x34
46 #define RTC_LMEM_MSB 0x35
47 #define RTC_HMEM_LSB 0x5b
48 #define RTC_HMEM_SB 0x5c
49 #define RTC_HMEM_MSB 0x5d
50
51 #define m_64KB (64*1024)
52 #define m_16MB (16*1024*1024)
53 #define m_4GB (4ULL*1024*1024*1024)
54
55 /*
56 * Returns the current RTC time as number of seconds since 00:00:00 Jan 1, 1970
57 */
58 #ifdef __FreeBSD__
59 static time_t
rtc_time(void)60 rtc_time(void)
61 {
62 struct tm tm;
63 time_t t;
64
65 time(&t);
66 if (get_config_bool_default("rtc.use_localtime", true)) {
67 localtime_r(&t, &tm);
68 t = timegm(&tm);
69 }
70 return (t);
71 }
72 #else /* __FreeBSD__ */
73 static void
rtc_time(timespec_t * ts)74 rtc_time(timespec_t *ts)
75 {
76 (void) clock_gettime(CLOCK_REALTIME, ts);
77
78 if (get_config_bool_default("rtc.use_localtime", true)) {
79 struct tm tm;
80
81 localtime_r(&ts->tv_sec, &tm);
82 ts->tv_sec = timegm(&tm);
83 }
84 }
85 #endif /* __FreeBSD__ */
86
87 void
rtc_init(struct vmctx * ctx)88 rtc_init(struct vmctx *ctx)
89 {
90 size_t himem;
91 size_t lomem;
92 int err;
93
94 /* XXX init diag/reset code/equipment/checksum ? */
95
96 /*
97 * Report guest memory size in nvram cells as required by UEFI.
98 * Little-endian encoding.
99 * 0x34/0x35 - 64KB chunks above 16MB, below 4GB
100 * 0x5b/0x5c/0x5d - 64KB chunks above 4GB
101 */
102 lomem = (vm_get_lowmem_size(ctx) - m_16MB) / m_64KB;
103 err = vm_rtc_write(ctx, RTC_LMEM_LSB, lomem);
104 assert(err == 0);
105 err = vm_rtc_write(ctx, RTC_LMEM_MSB, lomem >> 8);
106 assert(err == 0);
107
108 himem = vm_get_highmem_size(ctx) / m_64KB;
109 err = vm_rtc_write(ctx, RTC_HMEM_LSB, himem);
110 assert(err == 0);
111 err = vm_rtc_write(ctx, RTC_HMEM_SB, himem >> 8);
112 assert(err == 0);
113 err = vm_rtc_write(ctx, RTC_HMEM_MSB, himem >> 16);
114 assert(err == 0);
115
116 #ifdef __FreeBSD__
117 err = vm_rtc_settime(ctx, rtc_time());
118 #else
119 timespec_t ts;
120
121 rtc_time(&ts);
122 err = vm_rtc_settime(ctx, &ts);
123 #endif
124 assert(err == 0);
125 }
126
127 static void
rtc_dsdt(void)128 rtc_dsdt(void)
129 {
130
131 dsdt_line("");
132 dsdt_line("Device (RTC)");
133 dsdt_line("{");
134 dsdt_line(" Name (_HID, EisaId (\"PNP0B00\"))");
135 dsdt_line(" Name (_CRS, ResourceTemplate ()");
136 dsdt_line(" {");
137 dsdt_indent(2);
138 dsdt_fixed_ioport(IO_RTC, 2);
139 dsdt_fixed_irq(8);
140 dsdt_unindent(2);
141 dsdt_line(" })");
142 dsdt_line("}");
143 }
144 LPC_DSDT(rtc_dsdt);
145
146 /*
147 * Reserve the extended RTC I/O ports although they are not emulated at this
148 * time.
149 */
150 SYSRES_IO(0x72, 6);
151