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