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