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