1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
|
/* 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))
return;
grub_efi_fini ();
if (!(flags & GRUB_LOADER_FLAG_EFI_KEEP_ALLOCATED_MEMORY))
grub_efi_memory_fini ();
}
|
