rtc.c revision 285830
1/*- 2 * Copyright (c) 2011 NetApp, Inc. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: releng/10.2/usr.sbin/bhyve/rtc.c 284894 2015-06-27 22:48:22Z neel $ 27 */ 28 29#include <sys/cdefs.h> 30__FBSDID("$FreeBSD: releng/10.2/usr.sbin/bhyve/rtc.c 284894 2015-06-27 22:48:22Z neel $"); 31 32#include <sys/types.h> 33 34#include <time.h> 35#include <assert.h> 36 37#include <machine/vmm.h> 38#include <vmmapi.h> 39 40#include "acpi.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 */ 59static time_t 60rtc_time(struct vmctx *ctx, int use_localtime) 61{ 62 struct tm tm; 63 time_t t; 64 65 time(&t); 66 if (use_localtime) { 67 localtime_r(&t, &tm); 68 t = timegm(&tm); 69 } 70 return (t); 71} 72 73void 74rtc_init(struct vmctx *ctx, int use_localtime) 75{ 76 size_t himem; 77 size_t lomem; 78 int err; 79 80 /* XXX init diag/reset code/equipment/checksum ? */ 81 82 /* 83 * Report guest memory size in nvram cells as required by UEFI. 84 * Little-endian encoding. 85 * 0x34/0x35 - 64KB chunks above 16MB, below 4GB 86 * 0x5b/0x5c/0x5d - 64KB chunks above 4GB 87 */ 88 lomem = (vm_get_lowmem_size(ctx) - m_16MB) / m_64KB; 89 err = vm_rtc_write(ctx, RTC_LMEM_LSB, lomem); 90 assert(err == 0); 91 err = vm_rtc_write(ctx, RTC_LMEM_MSB, lomem >> 8); 92 assert(err == 0); 93 94 himem = vm_get_highmem_size(ctx) / m_64KB; 95 err = vm_rtc_write(ctx, RTC_HMEM_LSB, himem); 96 assert(err == 0); 97 err = vm_rtc_write(ctx, RTC_HMEM_SB, himem >> 8); 98 assert(err == 0); 99 err = vm_rtc_write(ctx, RTC_HMEM_MSB, himem >> 16); 100 assert(err == 0); 101 102 err = vm_rtc_settime(ctx, rtc_time(ctx, use_localtime)); 103 assert(err == 0); 104} 105 106static void 107rtc_dsdt(void) 108{ 109 110 dsdt_line(""); 111 dsdt_line("Device (RTC)"); 112 dsdt_line("{"); 113 dsdt_line(" Name (_HID, EisaId (\"PNP0B00\"))"); 114 dsdt_line(" Name (_CRS, ResourceTemplate ()"); 115 dsdt_line(" {"); 116 dsdt_indent(2); 117 dsdt_fixed_ioport(IO_RTC, 2); 118 dsdt_fixed_irq(8); 119 dsdt_unindent(2); 120 dsdt_line(" })"); 121 dsdt_line("}"); 122} 123LPC_DSDT(rtc_dsdt); 124 125/* 126 * Reserve the extended RTC I/O ports although they are not emulated at this 127 * time. 128 */ 129SYSRES_IO(0x72, 6); 130