/* *	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_intel.h>#include <asm/microcode_amd.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 x86_vendor(void){	u32 eax = 0x00000000;	u32 ebx, ecx = 0, edx; 	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;} static int x86_family(void){	u32 eax = 0x00000001;	u32 ebx, ecx = 0, edx;	int x86; 	native_cpuid(&eax, &ebx, &ecx, &edx); 	x86 = (eax >> 8) & 0xf;	if (x86 == 15)		x86 += (eax >> 20) & 0xff; 	return x86;} void __init load_ucode_bsp(void){	int vendor, x86; 	if (!have_cpuid_p())		return; 	vendor = x86_vendor();	x86 = x86_family(); 	switch (vendor) {	case X86_VENDOR_INTEL:		if (x86 >= 6)			load_ucode_intel_bsp();		break;	case X86_VENDOR_AMD:		if (x86 >= 0x10)			load_ucode_amd_bsp();		break;	default:		break;	}} void load_ucode_ap(void){	int vendor, x86; 	if (!have_cpuid_p())		return; 	vendor = x86_vendor();	x86 = x86_family(); 	switch (vendor) {	case X86_VENDOR_INTEL:		if (x86 >= 6)			load_ucode_intel_ap();		break;	case X86_VENDOR_AMD:		if (x86 >= 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;}