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/*
* 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;
}
}
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