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48 lines
1.3 KiB
C
48 lines
1.3 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2009,2017 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/kernel.h>
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#include <grub/env.h>
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#include <grub/time.h>
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#include <grub/cpu/mips.h>
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grub_uint32_t grub_arch_cpuclock;
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/* FIXME: use interrupt to count high. */
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grub_uint64_t
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grub_get_rtc (void)
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{
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static grub_uint32_t high = 0;
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static grub_uint32_t last = 0;
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grub_uint32_t low;
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asm volatile ("mfc0 %0, " GRUB_CPU_MIPS_COP0_TIMER_COUNT : "=r" (low));
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if (low < last)
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high++;
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last = low;
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return (((grub_uint64_t) high) << 32) | low;
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}
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void
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grub_timer_init (grub_uint32_t cpuclock)
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{
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grub_arch_cpuclock = cpuclock;
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grub_install_get_time_ms (grub_rtc_get_time_ms);
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}
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