| /* init.c - initialize an ia64-based EFI system */ |
| /* |
| * GRUB -- GRand Unified Bootloader |
| * Copyright (C) 2008 Free Software Foundation, Inc. |
| * |
| * GRUB is free software: you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation, either version 3 of the License, or |
| * (at your option) any later version. |
| * |
| * GRUB is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with GRUB. If not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #include <grub/types.h> |
| #include <grub/misc.h> |
| #include <grub/mm.h> |
| #include <grub/time.h> |
| #include <grub/err.h> |
| #include <grub/dl.h> |
| #include <grub/kernel.h> |
| #include <grub/efi/efi.h> |
| #include <grub/loader.h> |
| |
| static grub_uint64_t divisor = 1; |
| |
| static grub_uint64_t |
| get_itc (void) |
| { |
| grub_uint64_t ret; |
| asm volatile ("mov %0=ar.itc" : "=r" (ret)); |
| return ret; |
| } |
| |
| grub_uint64_t |
| grub_rtc_get_time_ms (void) |
| { |
| return get_itc () / divisor; |
| } |
| |
| void |
| grub_machine_init (void) |
| { |
| grub_efi_event_t event; |
| grub_uint64_t before, after; |
| grub_efi_uintn_t idx; |
| grub_efi_init (); |
| |
| efi_call_5 (grub_efi_system_table->boot_services->create_event, |
| GRUB_EFI_EVT_TIMER, GRUB_EFI_TPL_CALLBACK, 0, 0, &event); |
| |
| before = get_itc (); |
| efi_call_3 (grub_efi_system_table->boot_services->set_timer, event, |
| GRUB_EFI_TIMER_RELATIVE, 200000); |
| efi_call_3 (grub_efi_system_table->boot_services->wait_for_event, 1, |
| &event, &idx); |
| after = get_itc (); |
| efi_call_1 (grub_efi_system_table->boot_services->close_event, event); |
| divisor = (after - before + 5) / 20; |
| if (divisor == 0) |
| divisor = 800000; |
| grub_install_get_time_ms (grub_rtc_get_time_ms); |
| } |
| |
| void |
| grub_machine_fini (int flags) |
| { |
| if (flags & GRUB_LOADER_FLAG_NORETURN) |
| grub_efi_fini (); |
| } |