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 #include <sys/cdefs.h>
30
31 #include <sys/types.h>
32
33 #include <time.h>
34 #include <assert.h>
35
36 #include <machine/vmm.h>
37 #include <vmmapi.h>
38
39 #include "acpi.h"
40 #include "config.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 #ifdef __FreeBSD__
60 static time_t
rtc_time(void)61 rtc_time(void)
62 {
63 struct tm tm;
64 time_t t;
65
66 time(&t);
67 if (get_config_bool_default("rtc.use_localtime", true)) {
68 localtime_r(&t, &tm);
69 t = timegm(&tm);
70 }
71 return (t);
72 }
73 #else /* __FreeBSD__ */
74 static void
rtc_time(timespec_t * ts)75 rtc_time(timespec_t *ts)
76 {
77 (void) clock_gettime(CLOCK_REALTIME, ts);
78
79 if (get_config_bool_default("rtc.use_localtime", true)) {
80 struct tm tm;
81
82 localtime_r(&ts->tv_sec, &tm);
83 ts->tv_sec = timegm(&tm);
84 }
85 }
86 #endif /* __FreeBSD__ */
87
88 void
rtc_init(struct vmctx * ctx)89 rtc_init(struct vmctx *ctx)
90 {
91 size_t himem;
92 size_t lomem;
93 int err;
94
95 /* XXX init diag/reset code/equipment/checksum ? */
96
97 /*
98 * Report guest memory size in nvram cells as required by UEFI.
99 * Little-endian encoding.
100 * 0x34/0x35 - 64KB chunks above 16MB, below 4GB
101 * 0x5b/0x5c/0x5d - 64KB chunks above 4GB
102 */
103 lomem = (vm_get_lowmem_size(ctx) - m_16MB) / m_64KB;
104 err = vm_rtc_write(ctx, RTC_LMEM_LSB, lomem);
105 assert(err == 0);
106 err = vm_rtc_write(ctx, RTC_LMEM_MSB, lomem >> 8);
107 assert(err == 0);
108
109 himem = vm_get_highmem_size(ctx) / m_64KB;
110 err = vm_rtc_write(ctx, RTC_HMEM_LSB, himem);
111 assert(err == 0);
112 err = vm_rtc_write(ctx, RTC_HMEM_SB, himem >> 8);
113 assert(err == 0);
114 err = vm_rtc_write(ctx, RTC_HMEM_MSB, himem >> 16);
115 assert(err == 0);
116
117 #ifdef __FreeBSD__
118 err = vm_rtc_settime(ctx, rtc_time());
119 #else
120 timespec_t ts;
121
122 rtc_time(&ts);
123 err = vm_rtc_settime(ctx, &ts);
124 #endif
125 assert(err == 0);
126 }
127
128 static void
rtc_dsdt(void)129 rtc_dsdt(void)
130 {
131
132 dsdt_line("");
133 dsdt_line("Device (RTC)");
134 dsdt_line("{");
135 dsdt_line(" Name (_HID, EisaId (\"PNP0B00\"))");
136 dsdt_line(" Name (_CRS, ResourceTemplate ()");
137 dsdt_line(" {");
138 dsdt_indent(2);
139 dsdt_fixed_ioport(IO_RTC, 2);
140 dsdt_fixed_irq(8);
141 dsdt_unindent(2);
142 dsdt_line(" })");
143 dsdt_line("}");
144 }
145 LPC_DSDT(rtc_dsdt);
146
147 /*
148 * Reserve the extended RTC I/O ports although they are not emulated at this
149 * time.
150 */
151 SYSRES_IO(0x72, 6);
152