75 lines
2 KiB
C
75 lines
2 KiB
C
/* init.c - initialize an ia64-based EFI system */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2008 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/types.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/err.h>
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#include <grub/dl.h>
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#include <grub/kernel.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 divisor = 1;
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static grub_uint64_t
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get_itc (void)
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{
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grub_uint64_t ret;
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asm volatile ("mov %0=ar.itc" : "=r" (ret));
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return ret;
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}
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grub_uint64_t
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grub_rtc_get_time_ms (void)
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{
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return get_itc () / divisor;
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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_efi_event_t event;
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grub_uint64_t before, after;
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grub_efi_uintn_t idx;
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grub_efi_init ();
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efi_call_5 (grub_efi_system_table->boot_services->create_event,
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GRUB_EFI_EVT_TIMER, GRUB_EFI_TPL_CALLBACK, 0, 0, &event);
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before = get_itc ();
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efi_call_3 (grub_efi_system_table->boot_services->set_timer, event,
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GRUB_EFI_TIMER_RELATIVE, 200000);
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efi_call_3 (grub_efi_system_table->boot_services->wait_for_event, 1,
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&event, &idx);
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after = get_itc ();
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efi_call_1 (grub_efi_system_table->boot_services->close_event, event);
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divisor = (after - before + 5) / 20;
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if (divisor == 0)
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divisor = 800000;
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grub_install_get_time_ms (grub_rtc_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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grub_efi_fini ();
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}
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