File 0004-tsc-Use-alternative-delay-sources-whenever-appropria.patch of Package grub2.3460
From d43a5ee65143f384357fbfdcace4258e3537c214 Mon Sep 17 00:00:00 2001
From: Vladimir Serbinenko <phcoder@gmail.com>
Date: Fri, 13 Nov 2015 16:14:53 +0100
Subject: [PATCH] tsc: Use alternative delay sources whenever appropriate.
PIT isn't available on some of new hardware including Hyper-V. So
use pmtimer for calibration. Moreover pmtimer calibration is faster, so
use it on coreboor where booting time is important.
Based on patch by Michael Chang.
---
grub-core/Makefile.am | 7 ++
grub-core/Makefile.core.def | 19 ++++-
grub-core/commands/acpi.c | 12 ---
grub-core/commands/efi/acpi.c | 59 --------------
grub-core/commands/i386/pc/acpi.c | 83 --------------------
grub-core/kern/acpi.c | 34 ++++++++
grub-core/kern/efi/acpi.c | 59 ++++++++++++++
grub-core/kern/i386/efi/tsc.c | 40 ++++++++++
grub-core/kern/i386/pc/acpi.c | 83 ++++++++++++++++++++
grub-core/kern/i386/tsc.c | 123 +++++++----------------------
grub-core/kern/i386/tsc_pit.c | 84 ++++++++++++++++++++
grub-core/kern/i386/tsc_pmtimer.c | 160 ++++++++++++++++++++++++++++++++++++++
grub-core/kern/i386/xen/tsc.c | 40 ++++++++++
include/grub/acpi.h | 17 ++--
include/grub/i386/tsc.h | 26 +++++++
15 files changed, 588 insertions(+), 258 deletions(-)
delete mode 100644 grub-core/commands/efi/acpi.c
delete mode 100644 grub-core/commands/i386/pc/acpi.c
create mode 100644 grub-core/kern/acpi.c
create mode 100644 grub-core/kern/efi/acpi.c
create mode 100644 grub-core/kern/i386/efi/tsc.c
create mode 100644 grub-core/kern/i386/pc/acpi.c
create mode 100644 grub-core/kern/i386/tsc_pit.c
create mode 100644 grub-core/kern/i386/tsc_pmtimer.c
create mode 100644 grub-core/kern/i386/xen/tsc.c
Index: grub-2.02~beta2/grub-core/Makefile.am
===================================================================
--- grub-2.02~beta2.orig/grub-core/Makefile.am
+++ grub-2.02~beta2/grub-core/Makefile.am
@@ -97,6 +97,7 @@ if COND_i386_efi
KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/efi/efi.h
KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/efi/disk.h
KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/i386/tsc.h
+KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/acpi.h
KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/pci.h
endif
@@ -108,10 +109,12 @@ KERNEL_HEADER_FILES += $(top_srcdir)/inc
KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/gfxterm.h
KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/font.h
KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/bufio.h
+KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/acpi.h
endif
if COND_i386_multiboot
KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/i386/tsc.h
+KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/acpi.h
endif
if COND_i386_qemu
@@ -150,11 +153,13 @@ KERNEL_HEADER_FILES += $(top_srcdir)/inc
KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/efi/disk.h
KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/i386/tsc.h
KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/pci.h
+KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/acpi.h
endif
if COND_ia64_efi
KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/efi/efi.h
KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/efi/disk.h
+KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/acpi.h
endif
if COND_mips
@@ -229,11 +234,13 @@ KERNEL_HEADER_FILES += $(top_srcdir)/inc
KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/efi/efi.h
KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/efi/disk.h
KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/arm/system.h
+KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/acpi.h
endif
if COND_arm64_efi
KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/efi/efi.h
KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/efi/disk.h
+KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/acpi.h
endif
if COND_emu
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
@@ -173,8 +173,20 @@ kernel = {
efi = kern/efi/init.c;
efi = kern/efi/mm.c;
efi = term/efi/console.c;
+ efi = kern/acpi.c;
+ efi = kern/efi/acpi.c;
+ i386_coreboot = kern/i386/pc/acpi.c;
+ i386_multiboot = kern/i386/pc/acpi.c;
+ i386_coreboot = kern/acpi.c;
+ i386_multiboot = kern/acpi.c;
x86 = kern/i386/tsc.c;
+ x86 = kern/i386/tsc_pit.c;
+ i386_efi = kern/i386/efi/tsc.c;
+ x86_64_efi = kern/i386/efi/tsc.c;
+ i386_efi = kern/i386/tsc_pmtimer.c;
+ i386_coreboot = kern/i386/tsc_pmtimer.c;
+ x86_64_efi = kern/i386/tsc_pmtimer.c;
i386_efi = kern/i386/efi/init.c;
i386_efi = bus/pci.c;
@@ -186,6 +198,7 @@ kernel = {
x86_64_efi = bus/pci.c;
xen = kern/i386/tsc.c;
+ xen = kern/i386/xen/tsc.c;
x86_64_xen = kern/x86_64/xen/hypercall.S;
i386_xen = kern/i386/xen/hypercall.S;
xen = kern/xen/init.c;
@@ -684,10 +697,8 @@ module = {
name = acpi;
common = commands/acpi.c;
- efi = commands/efi/acpi.c;
- i386_pc = commands/i386/pc/acpi.c;
- i386_coreboot = commands/i386/pc/acpi.c;
- i386_multiboot = commands/i386/pc/acpi.c;
+ i386_pc = kern/acpi.c;
+ i386_pc = kern/i386/pc/acpi.c;
enable = efi;
enable = i386_pc;
Index: grub-2.02~beta2/grub-core/commands/acpi.c
===================================================================
--- grub-2.02~beta2.orig/grub-core/commands/acpi.c
+++ grub-2.02~beta2/grub-core/commands/acpi.c
@@ -61,18 +61,6 @@ static const struct grub_arg_option opti
{0, 0, 0, 0, 0, 0}
};
-/* Simple checksum by summing all bytes. Used by ACPI and SMBIOS. */
-grub_uint8_t
-grub_byte_checksum (void *base, grub_size_t size)
-{
- grub_uint8_t *ptr;
- grub_uint8_t ret = 0;
- for (ptr = (grub_uint8_t *) base; ptr < ((grub_uint8_t *) base) + size;
- ptr++)
- ret += *ptr;
- return ret;
-}
-
/* rev1 is 1 if ACPIv1 is to be generated, 0 otherwise.
rev2 contains the revision of ACPIv2+ to generate or 0 if none. */
static int rev1, rev2;
Index: grub-2.02~beta2/grub-core/commands/efi/acpi.c
===================================================================
--- grub-2.02~beta2.orig/grub-core/commands/efi/acpi.c
+++ /dev/null
@@ -1,59 +0,0 @@
-/* acpi.c - get acpi tables. */
-/*
- * GRUB -- GRand Unified Bootloader
- * Copyright (C) 2009 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/acpi.h>
-#include <grub/misc.h>
-#include <grub/efi/efi.h>
-#include <grub/efi/api.h>
-
-struct grub_acpi_rsdp_v10 *
-grub_machine_acpi_get_rsdpv1 (void)
-{
- unsigned i;
- static grub_efi_packed_guid_t acpi_guid = GRUB_EFI_ACPI_TABLE_GUID;
-
- for (i = 0; i < grub_efi_system_table->num_table_entries; i++)
- {
- grub_efi_packed_guid_t *guid =
- &grub_efi_system_table->configuration_table[i].vendor_guid;
-
- if (! grub_memcmp (guid, &acpi_guid, sizeof (grub_efi_packed_guid_t)))
- return (struct grub_acpi_rsdp_v10 *)
- grub_efi_system_table->configuration_table[i].vendor_table;
- }
- return 0;
-}
-
-struct grub_acpi_rsdp_v20 *
-grub_machine_acpi_get_rsdpv2 (void)
-{
- unsigned i;
- static grub_efi_packed_guid_t acpi20_guid = GRUB_EFI_ACPI_20_TABLE_GUID;
-
- for (i = 0; i < grub_efi_system_table->num_table_entries; i++)
- {
- grub_efi_packed_guid_t *guid =
- &grub_efi_system_table->configuration_table[i].vendor_guid;
-
- if (! grub_memcmp (guid, &acpi20_guid, sizeof (grub_efi_packed_guid_t)))
- return (struct grub_acpi_rsdp_v20 *)
- grub_efi_system_table->configuration_table[i].vendor_table;
- }
- return 0;
-}
Index: grub-2.02~beta2/grub-core/commands/i386/pc/acpi.c
===================================================================
--- grub-2.02~beta2.orig/grub-core/commands/i386/pc/acpi.c
+++ /dev/null
@@ -1,83 +0,0 @@
-/* acpi.c - get acpi tables. */
-/*
- * GRUB -- GRand Unified Bootloader
- * Copyright (C) 2009 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/acpi.h>
-#include <grub/misc.h>
-
-struct grub_acpi_rsdp_v10 *
-grub_machine_acpi_get_rsdpv1 (void)
-{
- int ebda_len;
- grub_uint8_t *ebda, *ptr;
-
- grub_dprintf ("acpi", "Looking for RSDP. Scanning EBDA\n");
- ebda = (grub_uint8_t *) ((* ((grub_uint16_t *) 0x40e)) << 4);
- ebda_len = * (grub_uint16_t *) ebda;
- if (! ebda_len) /* FIXME do we really need this check? */
- goto scan_bios;
- for (ptr = ebda; ptr < ebda + 0x400; ptr += 16)
- if (grub_memcmp (ptr, GRUB_RSDP_SIGNATURE, GRUB_RSDP_SIGNATURE_SIZE) == 0
- && grub_byte_checksum (ptr, sizeof (struct grub_acpi_rsdp_v10)) == 0
- && ((struct grub_acpi_rsdp_v10 *) ptr)->revision == 0)
- return (struct grub_acpi_rsdp_v10 *) ptr;
-
-scan_bios:
- grub_dprintf ("acpi", "Looking for RSDP. Scanning BIOS\n");
- for (ptr = (grub_uint8_t *) 0xe0000; ptr < (grub_uint8_t *) 0x100000;
- ptr += 16)
- if (grub_memcmp (ptr, GRUB_RSDP_SIGNATURE, GRUB_RSDP_SIGNATURE_SIZE) == 0
- && grub_byte_checksum (ptr, sizeof (struct grub_acpi_rsdp_v10)) == 0
- && ((struct grub_acpi_rsdp_v10 *) ptr)->revision == 0)
- return (struct grub_acpi_rsdp_v10 *) ptr;
- return 0;
-}
-
-struct grub_acpi_rsdp_v20 *
-grub_machine_acpi_get_rsdpv2 (void)
-{
- int ebda_len;
- grub_uint8_t *ebda, *ptr;
-
- grub_dprintf ("acpi", "Looking for RSDP. Scanning EBDA\n");
- ebda = (grub_uint8_t *) ((* ((grub_uint16_t *) 0x40e)) << 4);
- ebda_len = * (grub_uint16_t *) ebda;
- if (! ebda_len) /* FIXME do we really need this check? */
- goto scan_bios;
- for (ptr = ebda; ptr < ebda + 0x400; ptr += 16)
- if (grub_memcmp (ptr, GRUB_RSDP_SIGNATURE, GRUB_RSDP_SIGNATURE_SIZE) == 0
- && grub_byte_checksum (ptr, sizeof (struct grub_acpi_rsdp_v10)) == 0
- && ((struct grub_acpi_rsdp_v10 *) ptr)->revision != 0
- && ((struct grub_acpi_rsdp_v20 *) ptr)->length < 1024
- && grub_byte_checksum (ptr, ((struct grub_acpi_rsdp_v20 *) ptr)->length)
- == 0)
- return (struct grub_acpi_rsdp_v20 *) ptr;
-
-scan_bios:
- grub_dprintf ("acpi", "Looking for RSDP. Scanning BIOS\n");
- for (ptr = (grub_uint8_t *) 0xe0000; ptr < (grub_uint8_t *) 0x100000;
- ptr += 16)
- if (grub_memcmp (ptr, GRUB_RSDP_SIGNATURE, GRUB_RSDP_SIGNATURE_SIZE) == 0
- && grub_byte_checksum (ptr, sizeof (struct grub_acpi_rsdp_v10)) == 0
- && ((struct grub_acpi_rsdp_v10 *) ptr)->revision != 0
- && ((struct grub_acpi_rsdp_v20 *) ptr)->length < 1024
- && grub_byte_checksum (ptr, ((struct grub_acpi_rsdp_v20 *) ptr)->length)
- == 0)
- return (struct grub_acpi_rsdp_v20 *) ptr;
- return 0;
-}
Index: grub-2.02~beta2/grub-core/kern/acpi.c
===================================================================
--- /dev/null
+++ grub-2.02~beta2/grub-core/kern/acpi.c
@@ -0,0 +1,34 @@
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2012 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/time.h>
+#include <grub/misc.h>
+#include <grub/acpi.h>
+
+/* Simple checksum by summing all bytes. Used by ACPI and SMBIOS. */
+grub_uint8_t
+grub_byte_checksum (void *base, grub_size_t size)
+{
+ grub_uint8_t *ptr;
+ grub_uint8_t ret = 0;
+ for (ptr = (grub_uint8_t *) base; ptr < ((grub_uint8_t *) base) + size;
+ ptr++)
+ ret += *ptr;
+ return ret;
+}
Index: grub-2.02~beta2/grub-core/kern/efi/acpi.c
===================================================================
--- /dev/null
+++ grub-2.02~beta2/grub-core/kern/efi/acpi.c
@@ -0,0 +1,59 @@
+/* acpi.c - get acpi tables. */
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2009 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/acpi.h>
+#include <grub/misc.h>
+#include <grub/efi/efi.h>
+#include <grub/efi/api.h>
+
+struct grub_acpi_rsdp_v10 *
+grub_machine_acpi_get_rsdpv1 (void)
+{
+ unsigned i;
+ static grub_efi_packed_guid_t acpi_guid = GRUB_EFI_ACPI_TABLE_GUID;
+
+ for (i = 0; i < grub_efi_system_table->num_table_entries; i++)
+ {
+ grub_efi_packed_guid_t *guid =
+ &grub_efi_system_table->configuration_table[i].vendor_guid;
+
+ if (! grub_memcmp (guid, &acpi_guid, sizeof (grub_efi_packed_guid_t)))
+ return (struct grub_acpi_rsdp_v10 *)
+ grub_efi_system_table->configuration_table[i].vendor_table;
+ }
+ return 0;
+}
+
+struct grub_acpi_rsdp_v20 *
+grub_machine_acpi_get_rsdpv2 (void)
+{
+ unsigned i;
+ static grub_efi_packed_guid_t acpi20_guid = GRUB_EFI_ACPI_20_TABLE_GUID;
+
+ for (i = 0; i < grub_efi_system_table->num_table_entries; i++)
+ {
+ grub_efi_packed_guid_t *guid =
+ &grub_efi_system_table->configuration_table[i].vendor_guid;
+
+ if (! grub_memcmp (guid, &acpi20_guid, sizeof (grub_efi_packed_guid_t)))
+ return (struct grub_acpi_rsdp_v20 *)
+ grub_efi_system_table->configuration_table[i].vendor_table;
+ }
+ return 0;
+}
Index: grub-2.02~beta2/grub-core/kern/i386/efi/tsc.c
===================================================================
--- /dev/null
+++ grub-2.02~beta2/grub-core/kern/i386/efi/tsc.c
@@ -0,0 +1,40 @@
+/* kern/i386/tsc.c - x86 TSC time source implementation
+ * Requires Pentium or better x86 CPU that supports the RDTSC instruction.
+ * This module uses the PIT to calibrate the TSC to
+ * real time.
+ *
+ * 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/time.h>
+#include <grub/misc.h>
+#include <grub/i386/tsc.h>
+#include <grub/efi/efi.h>
+#include <grub/efi/api.h>
+
+int
+grub_tsc_calibrate_from_efi (void)
+{
+ grub_uint64_t start_tsc, end_tsc;
+ /* Use EFI Time Service to calibrate TSC */
+ start_tsc = grub_get_tsc ();
+ efi_call_1 (grub_efi_system_table->boot_services->stall, 1000);
+ end_tsc = grub_get_tsc ();
+ grub_tsc_rate = grub_divmod64 ((1ULL << 32), end_tsc - start_tsc, 0);
+ return 1;
+}
Index: grub-2.02~beta2/grub-core/kern/i386/pc/acpi.c
===================================================================
--- /dev/null
+++ grub-2.02~beta2/grub-core/kern/i386/pc/acpi.c
@@ -0,0 +1,83 @@
+/* acpi.c - get acpi tables. */
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2009 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/acpi.h>
+#include <grub/misc.h>
+
+struct grub_acpi_rsdp_v10 *
+grub_machine_acpi_get_rsdpv1 (void)
+{
+ int ebda_len;
+ grub_uint8_t *ebda, *ptr;
+
+ grub_dprintf ("acpi", "Looking for RSDP. Scanning EBDA\n");
+ ebda = (grub_uint8_t *) ((* ((grub_uint16_t *) 0x40e)) << 4);
+ ebda_len = * (grub_uint16_t *) ebda;
+ if (! ebda_len) /* FIXME do we really need this check? */
+ goto scan_bios;
+ for (ptr = ebda; ptr < ebda + 0x400; ptr += 16)
+ if (grub_memcmp (ptr, GRUB_RSDP_SIGNATURE, GRUB_RSDP_SIGNATURE_SIZE) == 0
+ && grub_byte_checksum (ptr, sizeof (struct grub_acpi_rsdp_v10)) == 0
+ && ((struct grub_acpi_rsdp_v10 *) ptr)->revision == 0)
+ return (struct grub_acpi_rsdp_v10 *) ptr;
+
+scan_bios:
+ grub_dprintf ("acpi", "Looking for RSDP. Scanning BIOS\n");
+ for (ptr = (grub_uint8_t *) 0xe0000; ptr < (grub_uint8_t *) 0x100000;
+ ptr += 16)
+ if (grub_memcmp (ptr, GRUB_RSDP_SIGNATURE, GRUB_RSDP_SIGNATURE_SIZE) == 0
+ && grub_byte_checksum (ptr, sizeof (struct grub_acpi_rsdp_v10)) == 0
+ && ((struct grub_acpi_rsdp_v10 *) ptr)->revision == 0)
+ return (struct grub_acpi_rsdp_v10 *) ptr;
+ return 0;
+}
+
+struct grub_acpi_rsdp_v20 *
+grub_machine_acpi_get_rsdpv2 (void)
+{
+ int ebda_len;
+ grub_uint8_t *ebda, *ptr;
+
+ grub_dprintf ("acpi", "Looking for RSDP. Scanning EBDA\n");
+ ebda = (grub_uint8_t *) ((* ((grub_uint16_t *) 0x40e)) << 4);
+ ebda_len = * (grub_uint16_t *) ebda;
+ if (! ebda_len) /* FIXME do we really need this check? */
+ goto scan_bios;
+ for (ptr = ebda; ptr < ebda + 0x400; ptr += 16)
+ if (grub_memcmp (ptr, GRUB_RSDP_SIGNATURE, GRUB_RSDP_SIGNATURE_SIZE) == 0
+ && grub_byte_checksum (ptr, sizeof (struct grub_acpi_rsdp_v10)) == 0
+ && ((struct grub_acpi_rsdp_v10 *) ptr)->revision != 0
+ && ((struct grub_acpi_rsdp_v20 *) ptr)->length < 1024
+ && grub_byte_checksum (ptr, ((struct grub_acpi_rsdp_v20 *) ptr)->length)
+ == 0)
+ return (struct grub_acpi_rsdp_v20 *) ptr;
+
+scan_bios:
+ grub_dprintf ("acpi", "Looking for RSDP. Scanning BIOS\n");
+ for (ptr = (grub_uint8_t *) 0xe0000; ptr < (grub_uint8_t *) 0x100000;
+ ptr += 16)
+ if (grub_memcmp (ptr, GRUB_RSDP_SIGNATURE, GRUB_RSDP_SIGNATURE_SIZE) == 0
+ && grub_byte_checksum (ptr, sizeof (struct grub_acpi_rsdp_v10)) == 0
+ && ((struct grub_acpi_rsdp_v10 *) ptr)->revision != 0
+ && ((struct grub_acpi_rsdp_v20 *) ptr)->length < 1024
+ && grub_byte_checksum (ptr, ((struct grub_acpi_rsdp_v20 *) ptr)->length)
+ == 0)
+ return (struct grub_acpi_rsdp_v20 *) ptr;
+ return 0;
+}
Index: grub-2.02~beta2/grub-core/kern/i386/tsc.c
===================================================================
--- grub-2.02~beta2.orig/grub-core/kern/i386/tsc.c
+++ grub-2.02~beta2/grub-core/kern/i386/tsc.c
@@ -1,7 +1,6 @@
/* kern/i386/tsc.c - x86 TSC time source implementation
* Requires Pentium or better x86 CPU that supports the RDTSC instruction.
- * This module uses the RTC (via grub_get_rtc()) to calibrate the TSC to
- * real time.
+ * This module calibrates the TSC to real time.
*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2008 Free Software Foundation, Inc.
@@ -25,12 +24,6 @@
#include <grub/misc.h>
#include <grub/i386/tsc.h>
#include <grub/i386/cpuid.h>
-#ifdef GRUB_MACHINE_XEN
-#include <grub/xen.h>
-#else
-#include <grub/i386/pit.h>
-#endif
-#include <grub/cpu/io.h>
/* This defines the value TSC had at the epoch (that is, when we calibrated it). */
static grub_uint64_t tsc_boot_time;
@@ -40,28 +33,20 @@ static grub_uint64_t tsc_boot_time;
in 32-bit. */
grub_uint32_t grub_tsc_rate;
-/* Read the TSC value, which increments with each CPU clock cycle. */
-static __inline grub_uint64_t
-grub_get_tsc (void)
+static grub_uint64_t
+grub_tsc_get_time_ms (void)
{
- grub_uint32_t lo, hi;
- grub_uint32_t a,b,c,d;
-
- /* The CPUID instruction is a 'serializing' instruction, and
- avoids out-of-order execution of the RDTSC instruction. */
- grub_cpuid (0,a,b,c,d);
- /* Read TSC value. We cannot use "=A", since this would use
- %rax on x86_64. */
- __asm__ __volatile__ ("rdtsc":"=a" (lo), "=d" (hi));
+ grub_uint64_t a = grub_get_tsc () - tsc_boot_time;
+ grub_uint64_t ah = a >> 32;
+ grub_uint64_t al = a & 0xffffffff;
- return (((grub_uint64_t) hi) << 32) | lo;
+ return ((al * grub_tsc_rate) >> 32) + ah * grub_tsc_rate;
}
-#ifndef GRUB_MACHINE_XEN
-
static __inline int
grub_cpu_is_tsc_supported (void)
{
+#ifndef GRUB_MACHINE_XEN
grub_uint32_t a,b,c,d;
if (! grub_cpu_is_cpuid_supported ())
return 0;
@@ -69,93 +54,41 @@ grub_cpu_is_tsc_supported (void)
grub_cpuid(1,a,b,c,d);
return (d & (1 << 4)) != 0;
-}
-
-static void
-grub_pit_wait (grub_uint16_t tics)
-{
- /* Disable timer2 gate and speaker. */
- grub_outb (grub_inb (GRUB_PIT_SPEAKER_PORT)
- & ~ (GRUB_PIT_SPK_DATA | GRUB_PIT_SPK_TMR2),
- GRUB_PIT_SPEAKER_PORT);
-
- /* Set tics. */
- grub_outb (GRUB_PIT_CTRL_SELECT_2 | GRUB_PIT_CTRL_READLOAD_WORD,
- GRUB_PIT_CTRL);
- grub_outb (tics & 0xff, GRUB_PIT_COUNTER_2);
- grub_outb (tics >> 8, GRUB_PIT_COUNTER_2);
-
- /* Enable timer2 gate, keep speaker disabled. */
- grub_outb ((grub_inb (GRUB_PIT_SPEAKER_PORT) & ~ GRUB_PIT_SPK_DATA)
- | GRUB_PIT_SPK_TMR2,
- GRUB_PIT_SPEAKER_PORT);
-
- /* Wait. */
- while ((grub_inb (GRUB_PIT_SPEAKER_PORT) & GRUB_PIT_SPK_TMR2_LATCH) == 0x00);
-
- /* Disable timer2 gate and speaker. */
- grub_outb (grub_inb (GRUB_PIT_SPEAKER_PORT)
- & ~ (GRUB_PIT_SPK_DATA | GRUB_PIT_SPK_TMR2),
- GRUB_PIT_SPEAKER_PORT);
-}
+#else
+ return 1;
#endif
-
-static grub_uint64_t
-grub_tsc_get_time_ms (void)
-{
- grub_uint64_t a = grub_get_tsc () - tsc_boot_time;
- grub_uint64_t ah = a >> 32;
- grub_uint64_t al = a & 0xffffffff;
-
- return ((al * grub_tsc_rate) >> 32) + ah * grub_tsc_rate;
}
-#ifndef GRUB_MACHINE_XEN
-/* Calibrate the TSC based on the RTC. */
-static void
-calibrate_tsc (void)
+static int
+calibrate_tsc_hardcode (void)
{
- /* First calibrate the TSC rate (relative, not absolute time). */
- grub_uint64_t end_tsc;
-
- tsc_boot_time = grub_get_tsc ();
- grub_pit_wait (0xffff);
- end_tsc = grub_get_tsc ();
-
- grub_tsc_rate = 0;
- if (end_tsc > tsc_boot_time)
- grub_tsc_rate = grub_divmod64 ((55ULL << 32), end_tsc - tsc_boot_time, 0);
- if (grub_tsc_rate == 0)
- grub_tsc_rate = 5368;/* 800 MHz */
+ grub_tsc_rate = 5368;/* 800 MHz */
+ return 1;
}
-#endif
void
grub_tsc_init (void)
{
-#ifdef GRUB_MACHINE_XEN
- grub_uint64_t t;
- tsc_boot_time = grub_get_tsc ();
- t = grub_xen_shared_info->vcpu_info[0].time.tsc_to_system_mul;
- if (grub_xen_shared_info->vcpu_info[0].time.tsc_shift > 0)
- t <<= grub_xen_shared_info->vcpu_info[0].time.tsc_shift;
- else
- t >>= -grub_xen_shared_info->vcpu_info[0].time.tsc_shift;
- grub_tsc_rate = grub_divmod64 (t, 1000000, 0);
- grub_install_get_time_ms (grub_tsc_get_time_ms);
-#else
- if (grub_cpu_is_tsc_supported ())
- {
- calibrate_tsc ();
- grub_install_get_time_ms (grub_tsc_get_time_ms);
- }
- else
+ if (!grub_cpu_is_tsc_supported ())
{
#if defined (GRUB_MACHINE_PCBIOS) || defined (GRUB_MACHINE_IEEE1275)
grub_install_get_time_ms (grub_rtc_get_time_ms);
#else
grub_fatal ("no TSC found");
#endif
+ return;
}
+
+ tsc_boot_time = grub_get_tsc ();
+
+#ifdef GRUB_MACHINE_XEN
+ (void) (grub_tsc_calibrate_from_xen () || calibrate_tsc_hardcode());
+#elif defined (GRUB_MACHINE_EFI)
+ (void) (grub_tsc_calibrate_from_pit () || grub_tsc_calibrate_from_pmtimer () || grub_tsc_calibrate_from_efi() || calibrate_tsc_hardcode());
+#elif defined (GRUB_MACHINE_COREBOOT)
+ (void) (grub_tsc_calibrate_from_pmtimer () || grub_tsc_calibrate_from_pit () || calibrate_tsc_hardcode());
+#else
+ (void) (grub_tsc_calibrate_from_pit () || calibrate_tsc_hardcode());
#endif
+ grub_install_get_time_ms (grub_tsc_get_time_ms);
}
Index: grub-2.02~beta2/grub-core/kern/i386/tsc_pit.c
===================================================================
--- /dev/null
+++ grub-2.02~beta2/grub-core/kern/i386/tsc_pit.c
@@ -0,0 +1,84 @@
+/* kern/i386/tsc.c - x86 TSC time source implementation
+ * Requires Pentium or better x86 CPU that supports the RDTSC instruction.
+ * This module uses the PIT to calibrate the TSC to
+ * real time.
+ *
+ * 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/time.h>
+#include <grub/misc.h>
+#include <grub/i386/tsc.h>
+#include <grub/i386/pit.h>
+#include <grub/cpu/io.h>
+
+static int
+grub_pit_wait (void)
+{
+ int ret = 0;
+
+ /* Disable timer2 gate and speaker. */
+ grub_outb (grub_inb (GRUB_PIT_SPEAKER_PORT)
+ & ~ (GRUB_PIT_SPK_DATA | GRUB_PIT_SPK_TMR2),
+ GRUB_PIT_SPEAKER_PORT);
+
+ /* Set tics. */
+ grub_outb (GRUB_PIT_CTRL_SELECT_2 | GRUB_PIT_CTRL_READLOAD_WORD,
+ GRUB_PIT_CTRL);
+ /* 0xffff ticks: 55ms. */
+ grub_outb (0xff, GRUB_PIT_COUNTER_2);
+ grub_outb (0xff, GRUB_PIT_COUNTER_2);
+
+ /* Enable timer2 gate, keep speaker disabled. */
+ grub_outb ((grub_inb (GRUB_PIT_SPEAKER_PORT) & ~ GRUB_PIT_SPK_DATA)
+ | GRUB_PIT_SPK_TMR2,
+ GRUB_PIT_SPEAKER_PORT);
+
+ if ((grub_inb (GRUB_PIT_SPEAKER_PORT) & GRUB_PIT_SPK_TMR2_LATCH)) {
+ ret = 1;
+ /* Wait. */
+ while ((grub_inb (GRUB_PIT_SPEAKER_PORT) & GRUB_PIT_SPK_TMR2_LATCH) == 0x00);
+ }
+
+ /* Disable timer2 gate and speaker. */
+ grub_outb (grub_inb (GRUB_PIT_SPEAKER_PORT)
+ & ~ (GRUB_PIT_SPK_DATA | GRUB_PIT_SPK_TMR2),
+ GRUB_PIT_SPEAKER_PORT);
+
+ return ret;
+}
+
+/* Calibrate the TSC based on the RTC. */
+int
+grub_tsc_calibrate_from_pit (void)
+{
+ /* First calibrate the TSC rate (relative, not absolute time). */
+ grub_uint64_t start_tsc, end_tsc;
+
+ start_tsc = grub_get_tsc ();
+ if (!grub_pit_wait ())
+ return 0;
+ end_tsc = grub_get_tsc ();
+
+ grub_tsc_rate = 0;
+ if (end_tsc > start_tsc)
+ grub_tsc_rate = grub_divmod64 ((55ULL << 32), end_tsc - start_tsc, 0);
+ if (grub_tsc_rate == 0)
+ return 0;
+ return 1;
+}
Index: grub-2.02~beta2/grub-core/kern/i386/tsc_pmtimer.c
===================================================================
--- /dev/null
+++ grub-2.02~beta2/grub-core/kern/i386/tsc_pmtimer.c
@@ -0,0 +1,160 @@
+/* kern/i386/tsc.c - x86 TSC time source implementation
+ * Requires Pentium or better x86 CPU that supports the RDTSC instruction.
+ * This module uses the PIT to calibrate the TSC to
+ * real time.
+ *
+ * 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/time.h>
+#include <grub/misc.h>
+#include <grub/i386/tsc.h>
+#include <grub/acpi.h>
+#include <grub/cpu/io.h>
+
+static void *
+grub_acpi_rsdt_find_table (struct grub_acpi_table_header *rsdt, const char *sig)
+{
+ grub_size_t s;
+ grub_uint32_t *ptr;
+
+ if (!rsdt)
+ return 0;
+
+ if (grub_memcmp (rsdt->signature, "RSDT", 4) != 0)
+ return 0;
+
+ ptr = (grub_uint32_t *) (rsdt + 1);
+ s = (rsdt->length - sizeof (*rsdt)) / sizeof (grub_uint32_t);
+ for (; s; s--, ptr++)
+ {
+ struct grub_acpi_table_header *tbl;
+ tbl = (struct grub_acpi_table_header *) (grub_addr_t) *ptr;
+ if (grub_memcmp (tbl->signature, sig, 4) == 0)
+ return tbl;
+ }
+ return 0;
+}
+
+static void *
+grub_acpi_xsdt_find_table (struct grub_acpi_table_header *xsdt, const char *sig)
+{
+ grub_size_t s;
+ grub_uint64_t *ptr;
+
+ if (!xsdt)
+ return 0;
+
+ if (grub_memcmp (xsdt->signature, "XSDT", 4) != 0)
+ return 0;
+
+ ptr = (grub_uint64_t *) (xsdt + 1);
+ s = (xsdt->length - sizeof (*xsdt)) / sizeof (grub_uint32_t);
+ for (; s; s--, ptr++)
+ {
+ struct grub_acpi_table_header *tbl;
+#if GRUB_CPU_SIZEOF_VOID_P != 8
+ if (*ptr >> 32)
+ continue;
+#endif
+ tbl = (struct grub_acpi_table_header *) (grub_addr_t) *ptr;
+ if (grub_memcmp (tbl->signature, sig, 4) == 0)
+ return tbl;
+ }
+ return 0;
+}
+
+struct grub_acpi_fadt *
+grub_acpi_find_fadt (void)
+{
+ struct grub_acpi_fadt *fadt = 0;
+ struct grub_acpi_rsdp_v10 *rsdpv1;
+ struct grub_acpi_rsdp_v20 *rsdpv2;
+ rsdpv1 = grub_machine_acpi_get_rsdpv1 ();
+ if (rsdpv1)
+ fadt = grub_acpi_rsdt_find_table ((struct grub_acpi_table_header *)
+ (grub_addr_t) rsdpv1->rsdt_addr,
+ GRUB_ACPI_FADT_SIGNATURE);
+ if (fadt)
+ return fadt;
+ rsdpv2 = grub_machine_acpi_get_rsdpv2 ();
+ if (rsdpv2)
+ fadt = grub_acpi_rsdt_find_table ((struct grub_acpi_table_header *)
+ (grub_addr_t) rsdpv2->rsdpv1.rsdt_addr,
+ GRUB_ACPI_FADT_SIGNATURE);
+ if (fadt)
+ return fadt;
+ if (rsdpv2
+#if GRUB_CPU_SIZEOF_VOID_P != 8
+ && !(rsdpv2->xsdt_addr >> 32)
+#endif
+ )
+ fadt = grub_acpi_xsdt_find_table ((struct grub_acpi_table_header *)
+ (grub_addr_t) rsdpv2->xsdt_addr,
+ GRUB_ACPI_FADT_SIGNATURE);
+ if (fadt)
+ return fadt;
+ return 0;
+}
+
+int
+grub_tsc_calibrate_from_pmtimer (void)
+{
+ grub_uint32_t start;
+ grub_uint32_t last;
+ grub_uint32_t cur, end;
+ struct grub_acpi_fadt *fadt;
+ grub_port_t p;
+ grub_uint64_t start_tsc;
+ grub_uint64_t end_tsc;
+ int num_iter = 0;
+
+ fadt = grub_acpi_find_fadt ();
+ if (!fadt)
+ return 0;
+ p = fadt->pmtimer;
+ if (!p)
+ return 0;
+
+ start = grub_inl (p) & 0xffffff;
+ last = start;
+ /* It's 3.579545 MHz clock. Wait 1 ms. */
+ end = start + 3580;
+ start_tsc = grub_get_tsc ();
+ while (1)
+ {
+ cur = grub_inl (p) & 0xffffff;
+ if (cur < last)
+ cur |= 0x1000000;
+ num_iter++;
+ if (cur >= end)
+ {
+ end_tsc = grub_get_tsc ();
+ grub_tsc_rate = grub_divmod64 ((1ULL << 32), end_tsc - start_tsc, 0);
+ return 1;
+ }
+ /* Check for broken PM timer.
+ 50000000 TSCs is between 5 ms (10GHz) and 200 ms (250 MHz)
+ if after this time we still don't have 1 ms on pmtimer, then
+ pmtimer is broken.
+ */
+ if ((num_iter & 0xffffff) == 0 && grub_get_tsc () - start_tsc > 5000000) {
+ return 0;
+ }
+ }
+}
Index: grub-2.02~beta2/grub-core/kern/i386/xen/tsc.c
===================================================================
--- /dev/null
+++ grub-2.02~beta2/grub-core/kern/i386/xen/tsc.c
@@ -0,0 +1,40 @@
+/* kern/i386/tsc.c - x86 TSC time source implementation
+ * Requires Pentium or better x86 CPU that supports the RDTSC instruction.
+ * This module uses the PIT to calibrate the TSC to
+ * real time.
+ *
+ * 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/time.h>
+#include <grub/misc.h>
+#include <grub/i386/tsc.h>
+#include <grub/xen.h>
+
+int
+grub_tsc_calibrate_from_xen (void)
+{
+ grub_uint64_t t;
+ t = grub_xen_shared_info->vcpu_info[0].time.tsc_to_system_mul;
+ if (grub_xen_shared_info->vcpu_info[0].time.tsc_shift > 0)
+ t <<= grub_xen_shared_info->vcpu_info[0].time.tsc_shift;
+ else
+ t >>= -grub_xen_shared_info->vcpu_info[0].time.tsc_shift;
+ grub_tsc_rate = grub_divmod64 (t, 1000000, 0);
+ return 1;
+}
Index: grub-2.02~beta2/include/grub/acpi.h
===================================================================
--- grub-2.02~beta2.orig/include/grub/acpi.h
+++ grub-2.02~beta2/include/grub/acpi.h
@@ -67,10 +67,14 @@ struct grub_acpi_fadt
grub_uint32_t dsdt_addr;
grub_uint8_t somefields1[20];
grub_uint32_t pm1a;
- grub_uint8_t somefields2[64];
+ grub_uint8_t somefields2[8];
+ grub_uint32_t pmtimer;
+ grub_uint8_t somefields3[32];
+ grub_uint32_t flags;
+ grub_uint8_t somefields4[16];
grub_uint64_t facs_xaddr;
grub_uint64_t dsdt_xaddr;
- grub_uint8_t somefields3[96];
+ grub_uint8_t somefields5[96];
} GRUB_PACKED;
#define GRUB_ACPI_MADT_SIGNATURE "APIC"
@@ -176,9 +180,9 @@ enum
#ifndef GRUB_DSDT_TEST
struct grub_acpi_rsdp_v10 *grub_acpi_get_rsdpv1 (void);
struct grub_acpi_rsdp_v20 *grub_acpi_get_rsdpv2 (void);
-struct grub_acpi_rsdp_v10 *grub_machine_acpi_get_rsdpv1 (void);
-struct grub_acpi_rsdp_v20 *grub_machine_acpi_get_rsdpv2 (void);
-grub_uint8_t grub_byte_checksum (void *base, grub_size_t size);
+struct grub_acpi_rsdp_v10 *EXPORT_FUNC(grub_machine_acpi_get_rsdpv1) (void);
+struct grub_acpi_rsdp_v20 *EXPORT_FUNC(grub_machine_acpi_get_rsdpv2) (void);
+grub_uint8_t EXPORT_FUNC(grub_byte_checksum) (void *base, grub_size_t size);
grub_err_t grub_acpi_create_ebda (void);
@@ -217,4 +221,7 @@ enum
GRUB_ACPI_EXTOPCODE_BANK_FIELD_OP = 0x87,
};
+struct grub_acpi_fadt *
+grub_acpi_find_fadt (void);
+
#endif /* ! GRUB_ACPI_HEADER */
Index: grub-2.02~beta2/include/grub/i386/tsc.h
===================================================================
--- grub-2.02~beta2.orig/include/grub/i386/tsc.h
+++ grub-2.02~beta2/include/grub/i386/tsc.h
@@ -20,9 +20,35 @@
#define KERNEL_CPU_TSC_HEADER 1
#include <grub/types.h>
+#include <grub/i386/cpuid.h>
void grub_tsc_init (void);
/* In ms per 2^32 ticks. */
extern grub_uint32_t EXPORT_VAR(grub_tsc_rate);
+int
+grub_tsc_calibrate_from_xen (void);
+int
+grub_tsc_calibrate_from_efi (void);
+int
+grub_tsc_calibrate_from_pmtimer (void);
+int
+grub_tsc_calibrate_from_pit (void);
+
+/* Read the TSC value, which increments with each CPU clock cycle. */
+static __inline grub_uint64_t
+grub_get_tsc (void)
+{
+ grub_uint32_t lo, hi;
+ grub_uint32_t a,b,c,d;
+
+ /* The CPUID instruction is a 'serializing' instruction, and
+ avoids out-of-order execution of the RDTSC instruction. */
+ grub_cpuid (0,a,b,c,d);
+ /* Read TSC value. We cannot use "=A", since this would use
+ %rax on x86_64. */
+ __asm__ __volatile__ ("rdtsc":"=a" (lo), "=d" (hi));
+
+ return (((grub_uint64_t) hi) << 32) | lo;
+}
#endif /* ! KERNEL_CPU_TSC_HEADER */
