66 lines
1.7 KiB
C
66 lines
1.7 KiB
C
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2016 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/mm.h>
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#include <grub/machine/kernel.h>
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#include <grub/types.h>
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#include <grub/err.h>
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#include <grub/time.h>
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#include <grub/misc.h>
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grub_uint64_t
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grub_armv7_get_timer_value(void);
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grub_uint32_t
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grub_armv7_get_timer_frequency(void);
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grub_uint32_t
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grub_arm_pfr1(void);
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static int have_timer = 0;
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static grub_uint32_t timer_frequency_in_khz;
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static grub_uint64_t
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generic_get_time_ms (void)
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{
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return grub_divmod64 (grub_armv7_get_timer_value(), timer_frequency_in_khz, 0);
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}
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static int
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try_generic_timer (void)
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{
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if (((grub_arm_pfr1 () >> 16) & 0xf) != 1)
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return 0;
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grub_printf ("freq = %x\n", grub_armv7_get_timer_frequency());
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timer_frequency_in_khz = 0x016e3600 / 1000; //grub_armv7_get_timer_frequency() / 1000;
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if (timer_frequency_in_khz == 0)
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return 0;
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grub_install_get_time_ms (generic_get_time_ms);
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have_timer = 1;
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return 1;
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}
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void
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grub_machine_timer_init (void)
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{
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if (!have_timer)
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try_generic_timer ();
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if (!have_timer)
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grub_fatal ("No timer found");
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}
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