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arm64: Use cpu timer for timekeeping.

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This commit is contained in:
Vladimir Serbinenko 2016-02-12 12:43:02 +01:00
parent 6f4189ffc1
commit 4598cafa7d
2 changed files with 61 additions and 1 deletions
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2
grub-core/Makefile.core.def
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@ -213,7 +213,7 @@ kernel = {
arm_efi = kern/arm/efi/init.c;
arm_efi = kern/arm/efi/misc.c;
arm64_efi = kern/arm/efi/init.c;
arm64_efi = kern/arm64/efi/init.c;
i386_pc = kern/i386/pc/init.c;
i386_pc = kern/i386/pc/mmap.c;

60
grub-core/kern/arm64/efi/init.c Normal file
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@ -0,0 +1,60 @@
/* init.c - initialize an arm-based EFI system */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2013 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/env.h>
#include <grub/kernel.h>
#include <grub/misc.h>
#include <grub/mm.h>
#include <grub/time.h>
#include <grub/efi/efi.h>
#include <grub/loader.h>
static grub_uint64_t timer_frequency_in_khz;
static grub_uint64_t
grub_efi_get_time_ms (void)
{
grub_uint64_t tmr;
asm volatile("mrs %0, cntvct_el0" : "=r" (tmr));
return tmr / timer_frequency_in_khz;
}
void
grub_machine_init (void)
{
grub_uint64_t timer_frequency;
grub_efi_init ();
asm volatile("mrs %0, cntfrq_el0" : "=r" (timer_frequency));
timer_frequency_in_khz = timer_frequency / 1000;
grub_install_get_time_ms (grub_efi_get_time_ms);
}
void
grub_machine_fini (int flags)
{
if (!(flags & GRUB_LOADER_FLAG_NORETURN))
return;
grub_efi_fini ();
}