77 lines
1.9 KiB
C
77 lines
1.9 KiB
C
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/* init.c - initialize a riscv-based EFI system */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2018 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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#if __riscv_xlen == 64
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asm volatile ("rdcycle %0" : "=r" (tmr));
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#else
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grub_uint32_t lo, hi, tmp;
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asm volatile (
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"1:\n"
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"rdcycleh %0\n"
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"rdcycle %1\n"
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"rdcycleh %2\n"
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"bne %0, %2, 1b"
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: "=&r" (hi), "=&r" (lo), "=&r" (tmp));
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tmr = ((grub_uint64_t)hi << 32) | lo;
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#endif
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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 time_before, time_after;
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grub_efi_init ();
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/* Calculate timer frequency */
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timer_frequency_in_khz = 1;
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time_before = grub_efi_get_time_ms();
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grub_efi_stall(1000);
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time_after = grub_efi_get_time_ms();
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timer_frequency_in_khz = time_after - time_before;
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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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