1 files changed, 148 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/microcode/core_early.c b/arch/x86/kernel/cpu/microcode/core_early.c
new file mode 100644
index 000000000..a413a69cb
--- /dev/null
+++ b/arch/x86/kernel/cpu/microcode/core_early.c
@@ -0,0 +1,148 @@
+/*
+ *	X86 CPU microcode early update for Linux
+ *
+ *	Copyright (C) 2012 Fenghua Yu <fenghua.yu@intel.com>
+ *			   H Peter Anvin" <hpa@zytor.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.h>
+#include <asm/microcode_intel.h>
+#include <asm/microcode_amd.h>
+#include <asm/processor.h>
+#include <asm/cmdline.h>
+
+static bool __init check_loader_disabled_bsp(void)
+{
+#ifdef CONFIG_X86_32
+	const char *cmdline = (const char *)__pa_nodebug(boot_command_line);
+	const char *opt	    = "dis_ucode_ldr";
+	const char *option  = (const char *)__pa_nodebug(opt);
+	bool *res = (bool *)__pa_nodebug(&dis_ucode_ldr);
+
+#else /* CONFIG_X86_64 */
+	const char *cmdline = boot_command_line;
+	const char *option  = "dis_ucode_ldr";
+	bool *res = &dis_ucode_ldr;
+#endif
+
+	if (cmdline_find_option_bool(cmdline, option))
+		*res = true;
+
+	return *res;
+}
+
+void __init load_ucode_bsp(void)
+{
+	int vendor, family;
+
+	if (check_loader_disabled_bsp())
+		return;
+
+	if (!have_cpuid_p())
+		return;
+
+	vendor = x86_vendor();
+	family = x86_family();
+
+	switch (vendor) {
+	case X86_VENDOR_INTEL:
+		if (family >= 6)
+			load_ucode_intel_bsp();
+		break;
+	case X86_VENDOR_AMD:
+		if (family >= 0x10)
+			load_ucode_amd_bsp();
+		break;
+	default:
+		break;
+	}
+}
+
+static bool check_loader_disabled_ap(void)
+{
+#ifdef CONFIG_X86_32
+	return *((bool *)__pa_nodebug(&dis_ucode_ldr));
+#else
+	return dis_ucode_ldr;
+#endif
+}
+
+void load_ucode_ap(void)
+{
+	int vendor, family;
+
+	if (check_loader_disabled_ap())
+		return;
+
+	if (!have_cpuid_p())
+		return;
+
+	vendor = x86_vendor();
+	family = x86_family();
+
+	switch (vendor) {
+	case X86_VENDOR_INTEL:
+		if (family >= 6)
+			load_ucode_intel_ap();
+		break;
+	case X86_VENDOR_AMD:
+		if (family >= 0x10)
+			load_ucode_amd_ap();
+		break;
+	default:
+		break;
+	}
+}
+
+int __init save_microcode_in_initrd(void)
+{
+	struct cpuinfo_x86 *c = &boot_cpu_data;
+
+	switch (c->x86_vendor) {
+	case X86_VENDOR_INTEL:
+		if (c->x86 >= 6)
+			save_microcode_in_initrd_intel();
+		break;
+	case X86_VENDOR_AMD:
+		if (c->x86 >= 0x10)
+			save_microcode_in_initrd_amd();
+		break;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+void reload_early_microcode(void)
+{
+	int vendor, family;
+
+	vendor = x86_vendor();
+	family = x86_family();
+
+	switch (vendor) {
+	case X86_VENDOR_INTEL:
+		if (family >= 6)
+			reload_ucode_intel();
+		break;
+	case X86_VENDOR_AMD:
+		if (family >= 0x10)
+			reload_ucode_amd();
+		break;
+	default:
+		break;
+	}
+}