File grub2-arm64-Use-cpu-timer-for-timekeeping.patch of Package grub2.4793
From 4598cafa7d0a71ba39fbe59a8df1a9195994feec Mon Sep 17 00:00:00 2001
From: Vladimir Serbinenko <phcoder@gmail.com>
Date: Fri, 12 Feb 2016 12:43:02 +0100
Subject: [PATCH] arm64: Use cpu timer for timekeeping.
---
grub-core/Makefile.core.def | 2 +-
grub-core/kern/arm64/efi/init.c | 60 +++++++++++++++++++++++++++++++++++++++++
2 files changed, 61 insertions(+), 1 deletion(-)
create mode 100644 grub-core/kern/arm64/efi/init.c
Index: grub-2.02~beta2/grub-core/Makefile.core.def
===================================================================
--- grub-2.02~beta2.orig/grub-core/Makefile.core.def
+++ grub-2.02~beta2/grub-core/Makefile.core.def
@@ -215,7 +215,7 @@ kernel = {
arm_efi = kern/arm/efi/init.c;
arm_efi = kern/arm/efi/misc.c;
- arm64_efi = kern/arm/efi/init.c;
+ arm64_efi = kern/arm64/efi/init.c;
i386_pc = kern/i386/pc/init.c;
i386_pc = kern/i386/pc/mmap.c;
Index: grub-2.02~beta2/grub-core/kern/arm64/efi/init.c
===================================================================
--- /dev/null
+++ grub-2.02~beta2/grub-core/kern/arm64/efi/init.c
@@ -0,0 +1,60 @@
+/* init.c - initialize an arm-based EFI system */
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2013 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/env.h>
+#include <grub/kernel.h>
+#include <grub/misc.h>
+#include <grub/mm.h>
+#include <grub/time.h>
+#include <grub/efi/efi.h>
+#include <grub/loader.h>
+
+static grub_uint64_t timer_frequency_in_khz;
+
+static grub_uint64_t
+grub_efi_get_time_ms (void)
+{
+ grub_uint64_t tmr;
+ asm volatile("mrs %0, cntvct_el0" : "=r" (tmr));
+
+ return tmr / timer_frequency_in_khz;
+}
+
+
+void
+grub_machine_init (void)
+{
+ grub_uint64_t timer_frequency;
+
+ grub_efi_init ();
+
+ asm volatile("mrs %0, cntfrq_el0" : "=r" (timer_frequency));
+ timer_frequency_in_khz = timer_frequency / 1000;
+
+ grub_install_get_time_ms (grub_efi_get_time_ms);
+}
+
+void
+grub_machine_fini (int flags)
+{
+ if (!(flags & GRUB_LOADER_FLAG_NORETURN))
+ return;
+
+ grub_efi_fini ();
+}