2 * SPDX-License-Identifier: BSD-2-Clause
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29 #include <sys/cdefs.h>
30 #include <sys/types.h>
35 #include <machine/vmm.h>
45 #define RTC_LMEM_LSB 0x34
46 #define RTC_LMEM_MSB 0x35
47 #define RTC_HMEM_LSB 0x5b
48 #define RTC_HMEM_SB 0x5c
49 #define RTC_HMEM_MSB 0x5d
51 #define m_64KB (64*1024)
52 #define m_16MB (16*1024*1024)
53 #define m_4GB (4ULL*1024*1024*1024)
56 * Returns the current RTC time as number of seconds since 00:00:00 Jan 1, 1970
65 if (get_config_bool_default("rtc.use_localtime", true)) {
73 rtc_init(struct vmctx *ctx)
79 /* XXX init diag/reset code/equipment/checksum ? */
82 * Report guest memory size in nvram cells as required by UEFI.
83 * Little-endian encoding.
84 * 0x34/0x35 - 64KB chunks above 16MB, below 4GB
85 * 0x5b/0x5c/0x5d - 64KB chunks above 4GB
87 lomem = (vm_get_lowmem_size(ctx) - m_16MB) / m_64KB;
88 err = vm_rtc_write(ctx, RTC_LMEM_LSB, lomem);
90 err = vm_rtc_write(ctx, RTC_LMEM_MSB, lomem >> 8);
93 himem = vm_get_highmem_size(ctx) / m_64KB;
94 err = vm_rtc_write(ctx, RTC_HMEM_LSB, himem);
96 err = vm_rtc_write(ctx, RTC_HMEM_SB, himem >> 8);
98 err = vm_rtc_write(ctx, RTC_HMEM_MSB, himem >> 16);
101 err = vm_rtc_settime(ctx, rtc_time());
110 dsdt_line("Device (RTC)");
112 dsdt_line(" Name (_HID, EisaId (\"PNP0B00\"))");
113 dsdt_line(" Name (_CRS, ResourceTemplate ()");
116 dsdt_fixed_ioport(IO_RTC, 2);
125 * Reserve the extended RTC I/O ports although they are not emulated at this