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Use the arm virtual counter in the arm64 loader

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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
This commit is contained in:
Andrew Turner 2021-05-12 07:45:09 +00:00
parent 25593adbc1
commit 0a0d6ce34d
2 changed files with 75 additions and 2 deletions
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5
stand/efi/libefi/Makefile
View File

@ -27,9 +27,10 @@ SRCS+= teken.c
.if ${MACHINE_CPUARCH} == "amd64" || ${MACHINE_CPUARCH} == "i386"
SRCS+= time.c
.elif ${MACHINE_CPUARCH} == "aarch64" || ${MACHINE_CPUARCH} == "arm" || \
${MACHINE_CPUARCH} == "riscv"
.elif ${MACHINE_CPUARCH} == "arm" || ${MACHINE_CPUARCH} == "riscv"
SRCS+= time_event.c
.elif ${MACHINE_CPUARCH} == "aarch64"
SRCS+= time_arm64.c
.endif
# We implement a slightly non-standard %S in that it always takes a

72
stand/efi/libefi/time_arm64.c Normal file
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@ -0,0 +1,72 @@
/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2021 Andrew Turner
*
* This work was supported by Innovate UK project 105694, "Digital Security
* by Design (DSbD) Technology Platform Prototype".
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <efi.h>
#include <efilib.h>
#include <time.h>
#include <sys/time.h>
#include <machine/armreg.h>
static uint64_t timer_freq;
void
efi_time_init(void)
{
/* Find the timer frequency */
timer_freq = READ_SPECIALREG(cntfrq_el0);
}
void
efi_time_fini(void)
{
}
time_t
time(time_t *tloc)
{
time_t t;
t = READ_SPECIALREG(cntvct_el0) / timer_freq;
if (tloc != NULL)
*tloc = t;
return (t);
}
time_t
getsecs(void)
{
return time(NULL);
}