Use the arm virtual counter in the arm64 loader
It exist on all ARMv8+ CPUs, and other boot loaders rely on it being present. Sponsored by: Innovate UK Differential Revision: https://reviews.freebsd.org/D30410
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@ -27,9 +27,10 @@ SRCS+= teken.c
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.if ${MACHINE_CPUARCH} == "amd64" || ${MACHINE_CPUARCH} == "i386"
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SRCS+= time.c
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.elif ${MACHINE_CPUARCH} == "aarch64" || ${MACHINE_CPUARCH} == "arm" || \
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${MACHINE_CPUARCH} == "riscv"
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.elif ${MACHINE_CPUARCH} == "arm" || ${MACHINE_CPUARCH} == "riscv"
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SRCS+= time_event.c
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.elif ${MACHINE_CPUARCH} == "aarch64"
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SRCS+= time_arm64.c
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.endif
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# We implement a slightly non-standard %S in that it always takes a
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72
stand/efi/libefi/time_arm64.c
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72
stand/efi/libefi/time_arm64.c
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@ -0,0 +1,72 @@
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/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2021 Andrew Turner
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*
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* This work was supported by Innovate UK project 105694, "Digital Security
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* by Design (DSbD) Technology Platform Prototype".
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <efi.h>
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#include <efilib.h>
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#include <time.h>
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#include <sys/time.h>
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#include <machine/armreg.h>
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static uint64_t timer_freq;
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void
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efi_time_init(void)
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{
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/* Find the timer frequency */
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timer_freq = READ_SPECIALREG(cntfrq_el0);
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}
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void
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efi_time_fini(void)
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{
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}
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time_t
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time(time_t *tloc)
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{
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time_t t;
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t = READ_SPECIALREG(cntvct_el0) / timer_freq;
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if (tloc != NULL)
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*tloc = t;
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return (t);
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}
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time_t
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getsecs(void)
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{
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return time(NULL);
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}
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