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 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 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 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