From dc48ee408f2bc27bf37f128a55abe6361e70b5e3 Mon Sep 17 00:00:00 2001
From: kettenis <kettenis@openbsd.org>
Date: Sun, 30 Apr 2023 17:24:24 +0000
Subject: [PATCH] Remove the EFI RTC implementation on amd64.  Since all amd64
 systems we know have a MC146818A compatible RTC this code isn't actually
 used.  But there are systems that have a buggy EFI implementation that blows
 up when we call the GetTime runtime service to check whether the RTC
 functionality is implemented.

ok mlarkin@, dlg@
---
 sys/arch/amd64/amd64/efi_machdep.c | 87 +-----------------------------
 1 file changed, 1 insertion(+), 86 deletions(-)

diff --git a/sys/arch/amd64/amd64/efi_machdep.c b/sys/arch/amd64/amd64/efi_machdep.c
index a5f4563ce7d..97be06b224b 100644
--- a/sys/arch/amd64/amd64/efi_machdep.c
+++ b/sys/arch/amd64/amd64/efi_machdep.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: efi_machdep.c,v 1.5 2023/01/14 12:11:10 kettenis Exp $	*/
+/*	$OpenBSD: efi_machdep.c,v 1.6 2023/04/30 17:24:24 kettenis Exp $	*/
 
 /*
  * Copyright (c) 2022 Mark Kettenis <kettenis@openbsd.org>
@@ -40,8 +40,6 @@ const struct cfattach efi_ca = {
 };
 
 void	efi_map_runtime(struct efi_softc *);
-int	efi_gettime(struct todr_chip_handle *, struct timeval *);
-int	efi_settime(struct todr_chip_handle *, struct timeval *);
 
 label_t efi_jmpbuf;
 
@@ -67,8 +65,6 @@ efi_attach(struct device *parent, struct device *self, void *aux)
 	uint64_t system_table;
 	bus_space_handle_t memh;
 	EFI_SYSTEM_TABLE *st;
-	EFI_TIME time;
-	EFI_STATUS status;
 	uint16_t major, minor;
 	int i;
 
@@ -121,25 +117,6 @@ efi_attach(struct device *parent, struct device *self, void *aux)
 		printf(" rev 0x%x\n", st->FirmwareRevision);
 	}
 	efi_leave(sc);
-
-	if (efi_enter_check(sc))
-		return;
-	status = sc->sc_rs->GetTime(&time, NULL);
-	efi_leave(sc);
-	if (status != EFI_SUCCESS)
-		return;
-
-	/*
-	 * EDK II implementations provide an implementation of
-	 * GetTime() that returns a fixed compiled-in time on hardware
-	 * without a (supported) RTC.  So only use this interface as a
-	 * last resort.
-	 */
-	sc->sc_todr.cookie = sc;
-	sc->sc_todr.todr_gettime = efi_gettime;
-	sc->sc_todr.todr_settime = efi_settime;
-	sc->sc_todr.todr_quality = -1000;
-	todr_attach(&sc->sc_todr);
 }
 
 void
@@ -243,65 +220,3 @@ efi_leave(struct efi_softc *sc)
 	lcr3(sc->sc_cr3);
 	intr_restore(sc->sc_psw);
 }
-
-int
-efi_gettime(struct todr_chip_handle *handle, struct timeval *tv)
-{
-	struct efi_softc *sc = handle->cookie;
-	struct clock_ymdhms dt;
-	EFI_TIME time;
-	EFI_STATUS status;
-
-	if (efi_enter_check(sc))
-		return EFAULT;
-	status = sc->sc_rs->GetTime(&time, NULL);
-	efi_leave(sc);
-	if (status != EFI_SUCCESS)
-		return EIO;
-
-	dt.dt_year = time.Year;
-	dt.dt_mon = time.Month;
-	dt.dt_day = time.Day;
-	dt.dt_hour = time.Hour;
-	dt.dt_min = time.Minute;
-	dt.dt_sec = time.Second;
-
-	if (dt.dt_sec > 59 || dt.dt_min > 59 || dt.dt_hour > 23 ||
-	    dt.dt_day > 31 || dt.dt_day == 0 ||
-	    dt.dt_mon > 12 || dt.dt_mon == 0 ||
-	    dt.dt_year < POSIX_BASE_YEAR)
-		return EINVAL;
-
-	tv->tv_sec = clock_ymdhms_to_secs(&dt);
-	tv->tv_usec = 0;
-	return 0;
-}
-
-int
-efi_settime(struct todr_chip_handle *handle, struct timeval *tv)
-{
-	struct efi_softc *sc = handle->cookie;
-	struct clock_ymdhms dt;
-	EFI_TIME time;
-	EFI_STATUS status;
-
-	clock_secs_to_ymdhms(tv->tv_sec, &dt);
-
-	time.Year = dt.dt_year;
-	time.Month = dt.dt_mon;
-	time.Day = dt.dt_day;
-	time.Hour = dt.dt_hour;
-	time.Minute = dt.dt_min;
-	time.Second = dt.dt_sec;
-	time.Nanosecond = 0;
-	time.TimeZone = 0;
-	time.Daylight = 0;
-
-	if (efi_enter_check(sc))
-		return EFAULT;
-	status = sc->sc_rs->SetTime(&time);
-	efi_leave(sc);
-	if (status != EFI_SUCCESS)
-		return EIO;
-	return 0;
-}
-- 
2.20.1