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Message-ID: <tip-a8ebf6d1d6971b90a20f5bd0465e6d520377e33b@git.kernel.org>
Date: Thu, 31 Jan 2013 14:29:50 -0800
From: tip-bot for Fenghua Yu <fenghua.yu@...el.com>
To: linux-tip-commits@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
fenghua.yu@...el.com, tglx@...utronix.de, hpa@...ux.intel.com
Subject: [tip:x86/microcode] x86/microcode_core_early.c:
Define interfaces for early loading ucode
Commit-ID: a8ebf6d1d6971b90a20f5bd0465e6d520377e33b
Gitweb: http://git.kernel.org/tip/a8ebf6d1d6971b90a20f5bd0465e6d520377e33b
Author: Fenghua Yu <fenghua.yu@...el.com>
AuthorDate: Thu, 20 Dec 2012 23:44:25 -0800
Committer: H. Peter Anvin <hpa@...ux.intel.com>
CommitDate: Thu, 31 Jan 2013 13:19:12 -0800
x86/microcode_core_early.c: Define interfaces for early loading ucode
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>
Link: http://lkml.kernel.org/r/1356075872-3054-6-git-send-email-fenghua.yu@intel.com
Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com>
---
arch/x86/include/asm/microcode.h | 14 +++++++
arch/x86/kernel/microcode_core_early.c | 76 ++++++++++++++++++++++++++++++++++
2 files changed, 90 insertions(+)
diff --git a/arch/x86/include/asm/microcode.h b/arch/x86/include/asm/microcode.h
index 43d921b..6825e2e 100644
--- a/arch/x86/include/asm/microcode.h
+++ b/arch/x86/include/asm/microcode.h
@@ -57,4 +57,18 @@ static inline struct microcode_ops * __init init_amd_microcode(void)
static inline void __exit exit_amd_microcode(void) {}
#endif
+#ifdef CONFIG_MICROCODE_EARLY
+#define MAX_UCODE_COUNT 128
+extern void __init load_ucode_bsp(void);
+extern __init void load_ucode_ap(void);
+extern int __init save_microcode_in_initrd(void);
+#else
+static inline void __init load_ucode_bsp(void) {}
+static inline __init void load_ucode_ap(void) {}
+static inline int __init save_microcode_in_initrd(void)
+{
+ return 0;
+}
+#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..577db84
--- /dev/null
+++ b/arch/x86/kernel/microcode_core_early.c
@@ -0,0 +1,76 @@
+/*
+ * 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 <asm/microcode_intel.h>
+#include <asm/processor.h>
+
+#define QCHAR(a, b, c, d) ((a) + ((b) << 8) + ((c) << 16) + ((d) << 24))
+#define CPUID_INTEL1 QCHAR('G', 'e', 'n', 'u')
+#define CPUID_INTEL2 QCHAR('i', 'n', 'e', 'I')
+#define CPUID_INTEL3 QCHAR('n', 't', 'e', 'l')
+#define CPUID_AMD1 QCHAR('A', 'u', 't', 'h')
+#define CPUID_AMD2 QCHAR('e', 'n', 't', 'i')
+#define CPUID_AMD3 QCHAR('c', 'A', 'M', 'D')
+
+#define CPUID_IS(a, b, c, ebx, ecx, edx) \
+ (!((ebx ^ (a))|(edx ^ (b))|(ecx ^ (c))))
+
+/*
+ * In early loading microcode phase on BSP, boot_cpu_data is not set up yet.
+ * x86_vendor() gets vendor id for BSP.
+ *
+ * In 32 bit AP case, accessing boot_cpu_data needs linear address. To simplify
+ * coding, we still use x86_vendor() to get vendor id for AP.
+ *
+ * x86_vendor() gets vendor information directly through cpuid.
+ */
+static int __cpuinit x86_vendor(void)
+{
+ u32 eax = 0x00000000;
+ u32 ebx, ecx = 0, edx;
+
+ if (!have_cpuid_p())
+ return X86_VENDOR_UNKNOWN;
+
+ native_cpuid(&eax, &ebx, &ecx, &edx);
+
+ if (CPUID_IS(CPUID_INTEL1, CPUID_INTEL2, CPUID_INTEL3, ebx, ecx, edx))
+ return X86_VENDOR_INTEL;
+
+ if (CPUID_IS(CPUID_AMD1, CPUID_AMD2, CPUID_AMD3, ebx, ecx, edx))
+ return X86_VENDOR_AMD;
+
+ return X86_VENDOR_UNKNOWN;
+}
+
+void __init load_ucode_bsp(void)
+{
+ int vendor = x86_vendor();
+
+ if (vendor == X86_VENDOR_INTEL)
+ load_ucode_intel_bsp();
+}
+
+void __cpuinit load_ucode_ap(void)
+{
+ int vendor = x86_vendor();
+
+ if (vendor == X86_VENDOR_INTEL)
+ load_ucode_intel_ap();
+}
--
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