vbatts/grub
1
0
Fork 0
Code Issues Pull requests Releases Wiki Activity

Use ITC on IA64 rather than broken routine based on daytime.

Browse source 
* grub-core/kern/efi/efi.c (grub_rtc_get_time_ms) [__ia64__]: Remove on
	ia64.
	(grub_get_rtc) [__ia64__]: Likewise.
	* grub-core/kern/ia64/efi/init.c (divisor): New variable.
	(get_itc): New function.
	(grub_rtc_get_time_ms): Likewise.
	(grub_machine_init): Calibrate ITC.
	* include/grub/efi/time.h (grub_get_rtc), (GRUB_TICKS_PER_SECOND):
	Keep only on non-ia64. Don't export since it's broken and used only
	if TSC is unavailable.
This commit is contained in:
Vladimir 'phcoder' Serbinenko 2012-06-09 10:52:39 +02:00
parent a176740446
commit 9e5e66d15e
4 changed files with 53 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

2
grub-core/kern/efi/efi.c
View file

@ -230,6 +230,7 @@ grub_efi_get_variable (const char *var, const grub_efi_guid_t *guid,
return NULL;
}
#ifndef __ia64__
grub_uint64_t
grub_rtc_get_time_ms (void)
{
@ -250,6 +251,7 @@ grub_get_rtc (void)
{
return grub_rtc_get_time_ms ();
}
#endif
#pragma GCC diagnostic ignored "-Wcast-align"

33
grub-core/kern/ia64/efi/init.c
View file

@ -27,10 +27,43 @@
#include <grub/kernel.h>
#include <grub/efi/efi.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);
}