81 lines
2.2 KiB
C
81 lines
2.2 KiB
C
/* init.c - initialize an ia64-based EFI system */
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/*
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* VAS_EBOOT -- GRand Unified Bootloader
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* Copyright (C) 2008 Free Software Foundation, Inc.
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*
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* VAS_EBOOT 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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* VAS_EBOOT 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 VAS_EBOOT. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <VasEBoot/types.h>
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#include <VasEBoot/misc.h>
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#include <VasEBoot/mm.h>
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#include <VasEBoot/time.h>
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#include <VasEBoot/err.h>
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#include <VasEBoot/dl.h>
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#include <VasEBoot/kernel.h>
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#include <VasEBoot/efi/efi.h>
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#include <VasEBoot/loader.h>
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static VasEBoot_uint64_t divisor = 1;
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static VasEBoot_uint64_t
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get_itc (void)
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{
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VasEBoot_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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VasEBoot_uint64_t
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VasEBoot_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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VasEBoot_machine_init (void)
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{
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VasEBoot_efi_event_t event;
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VasEBoot_uint64_t before, after;
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VasEBoot_efi_uintn_t idx;
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VasEBoot_efi_init ();
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VasEBoot_efi_system_table->boot_services->create_event (VAS_EBOOT_EFI_EVT_TIMER,
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VAS_EBOOT_EFI_TPL_CALLBACK,
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0, 0, &event);
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before = get_itc ();
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VasEBoot_efi_system_table->boot_services->set_timer (event, VAS_EBOOT_EFI_TIMER_RELATIVE,
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200000);
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VasEBoot_efi_system_table->boot_services->wait_for_event (1, &event, &idx);
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after = get_itc ();
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VasEBoot_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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VasEBoot_install_get_time_ms (VasEBoot_rtc_get_time_ms);
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}
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void
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VasEBoot_machine_fini (int flags)
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{
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if (!(flags & VAS_EBOOT_LOADER_FLAG_NORETURN))
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return;
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VasEBoot_efi_fini ();
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if (!(flags & VAS_EBOOT_LOADER_FLAG_EFI_KEEP_ALLOCATED_MEMORY))
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VasEBoot_efi_memory_fini ();
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}
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