77 строки
2.1 KiB
C
77 строки
2.1 KiB
C
/*
|
|
* 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/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();
|
|
}
|