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Message-Id: <1354240068-9821-4-git-send-email-fenghua.yu@intel.com>
Date: Thu, 29 Nov 2012 17:47:41 -0800
From: "Fenghua Yu" <fenghua.yu@...el.com>
To: "H Peter Anvin" <hpa@...or.com>, "Ingo Molnar" <mingo@...e.hu>,
"Thomas Gleixner" <tglx@...utronix.de>,
"Asit K Mallick" <asit.k.mallick@...el.com>,
"Tigran Aivazian" <tigran@...azian.fsnet.co.uk>,
"Andreas Herrmann" <andreas.herrmann3@....com>,
"Borislav Petkov" <borislav.petkov@....com>,
"linux-kernel" <linux-kernel@...r.kernel.org>,
"x86" <x86@...nel.org>
Cc: "Fenghua Yu" <fenghua.yu@...el.com>
Subject: [PATCH v2 03/10] x86/microcode_core_early.c: Define interfaces for early loading ucode
From: Fenghua Yu <fenghua.yu@...el.com>
Define interfaces load_ucode_bsp() and load_ucode_ap() to load ucode on BSP and
AP in early boot time. These are generic interfaces. Internally they call
vendor specific implementations.
Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
---
arch/x86/include/asm/microcode.h | 23 ++++++++++
arch/x86/kernel/microcode_core_early.c | 70 ++++++++++++++++++++++++++++++++
2 files changed, 93 insertions(+), 0 deletions(-)
create mode 100644 arch/x86/kernel/microcode_core_early.c
diff --git a/arch/x86/include/asm/microcode.h b/arch/x86/include/asm/microcode.h
index 43d921b..2e2ff3a 100644
--- a/arch/x86/include/asm/microcode.h
+++ b/arch/x86/include/asm/microcode.h
@@ -57,4 +57,27 @@ static inline struct microcode_ops * __init init_amd_microcode(void)
static inline void __exit exit_amd_microcode(void) {}
#endif
+struct mc_saved_data {
+ unsigned int mc_saved_count;
+ struct microcode_intel **mc_saved;
+ struct ucode_cpu_info *ucode_cpu_info;
+};
+#ifdef CONFIG_MICROCODE_EARLY
+#define MAX_UCODE_COUNT 128
+extern struct ucode_cpu_info ucode_cpu_info_early[NR_CPUS];
+extern struct microcode_intel __initdata *mc_saved_in_initrd[MAX_UCODE_COUNT];
+extern struct mc_saved_data mc_saved_data;
+extern void __init load_ucode_bsp(char *real_mode_data);
+extern __init void load_ucode_ap(void);
+extern void __init
+save_microcode_in_initrd(struct mc_saved_data *mc_saved_data,
+ struct microcode_intel **mc_saved_in_initrd);
+#else
+static inline void __init load_ucode_bsp(char *real_mode_data) {}
+static inline __init void load_ucode_ap(void) {}
+static inline void __init
+save_microcode_in_initrd(struct mc_saved_data *mc_saved_data,
+ struct microcode_intel **mc_saved_in_initrd) {}
+#endif
+
#endif /* _ASM_X86_MICROCODE_H */
diff --git a/arch/x86/kernel/microcode_core_early.c b/arch/x86/kernel/microcode_core_early.c
new file mode 100644
index 0000000..1c6cc8f
--- /dev/null
+++ b/arch/x86/kernel/microcode_core_early.c
@@ -0,0 +1,70 @@
+/*
+ * X86 CPU microcode early update for Linux
+ *
+ * Copyright (C) 2012 Fenghua Yu <fenghua.yu@...el.com>
+ * H Peter Anvin" <hpa@...or.com>
+ *
+ * This driver allows to early upgrade microcode on Intel processors
+ * belonging to IA-32 family - PentiumPro, Pentium II,
+ * Pentium III, Xeon, Pentium 4, etc.
+ *
+ * Reference: Section 9.11 of Volume 3, IA-32 Intel Architecture
+ * Software Developer's Manual.
+ *
+ * This program 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
+ * 2 of the License, or (at your option) any later version.
+ */
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <asm/microcode_intel.h>
+#include <asm/processor.h>
+
+struct ucode_cpu_info ucode_cpu_info_early[NR_CPUS];
+EXPORT_SYMBOL_GPL(ucode_cpu_info_early);
+
+static inline int __init x86_vendor(void)
+{
+ unsigned int eax = 0x00000000;
+ char x86_vendor_id[16];
+ int i;
+ struct {
+ char x86_vendor_id[16];
+ __u8 x86_vendor;
+ } cpu_vendor_table[] = {
+ { "GenuineIntel", X86_VENDOR_INTEL },
+ { "AuthenticAMD", X86_VENDOR_AMD },
+ };
+
+ memset(x86_vendor_id, 0, ARRAY_SIZE(x86_vendor_id));
+ /* Get vendor name */
+ native_cpuid(&eax,
+ (unsigned int *)&x86_vendor_id[0],
+ (unsigned int *)&x86_vendor_id[8],
+ (unsigned int *)&x86_vendor_id[4]);
+
+ for (i = 0; i < ARRAY_SIZE(cpu_vendor_table); i++) {
+ if (!strcmp(x86_vendor_id, cpu_vendor_table[i].x86_vendor_id))
+ return cpu_vendor_table[i].x86_vendor;
+ }
+
+ return X86_VENDOR_UNKNOWN;
+}
+
+
+void __init load_ucode_bsp(char *real_mode_data)
+{
+ /*
+ * boot_cpu_data is not setup yet in this early phase.
+ * So we get vendor information directly through cpuid.
+ */
+ if (x86_vendor() == X86_VENDOR_INTEL)
+ load_ucode_intel_bsp(real_mode_data);
+}
+
+void __cpuinit load_ucode_ap(void)
+{
+ if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
+ load_ucode_intel_ap();
+}
--
1.7.2
--
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