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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2012 The ChromiumOS Authors. All rights reserved.
* Copyright (C) 2000 Ronald G. Minnich
*
* 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; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/* Microcode update for Intel PIII and later CPUs */
#include <stdint.h>
#include <stddef.h>
#if !defined(__ROMCC__)
#include <console/console.h>
#endif
#include <cpu/cpu.h>
#include <cpu/x86/msr.h>
#include <cpu/intel/microcode.h>
#if !defined(__PRE_RAM__)
#include <cbfs.h>
#include <smp/spinlock.h>
DECLARE_SPIN_LOCK(microcode_lock)
#else
#include <arch/cbfs.h>
#endif
struct microcode {
u32 hdrver; /* Header Version */
u32 rev; /* Update Revision */
u32 date; /* Date */
u32 sig; /* Processor Signature */
u32 cksum; /* Checksum */
u32 ldrver; /* Loader Revision */
u32 pf; /* Processor Flags */
u32 data_size; /* Data Size */
u32 total_size; /* Total Size */
u32 reserved[3];
};
static inline u32 read_microcode_rev(void)
{
/* Some Intel CPUs can be very finicky about the
* CPUID sequence used. So this is implemented in
* assembly so that it works reliably.
*/
msr_t msr;
asm volatile (
"xorl %%eax, %%eax\n\t"
"xorl %%edx, %%edx\n\t"
"movl $0x8b, %%ecx\n\t"
"wrmsr\n\t"
"movl $0x01, %%eax\n\t"
"cpuid\n\t"
"movl $0x08b, %%ecx\n\t"
"rdmsr \n\t"
: /* outputs */
"=a" (msr.lo), "=d" (msr.hi)
: /* inputs */
: /* trashed */
"ebx", "ecx"
);
return msr.hi;
}
#define MICROCODE_CBFS_FILE "cpu_microcode_blob.bin"
void intel_microcode_load_unlocked(const void *microcode_patch)
{
u32 current_rev;
msr_t msr;
const struct microcode *m = microcode_patch;
if (!m)
return;
current_rev = read_microcode_rev();
/* No use loading the same revision. */
if (current_rev == m->rev)
return;
msr.lo = (unsigned long)m + sizeof(struct microcode);
msr.hi = 0;
wrmsr(0x79, msr);
#if !defined(__ROMCC__)
printk(BIOS_DEBUG, "microcode: updated to revision "
"0x%x date=%04x-%02x-%02x\n", read_microcode_rev(),
m->date & 0xffff, (m->date >> 24) & 0xff,
(m->date >> 16) & 0xff);
#endif
}
const void *intel_microcode_find(void)
{
struct cbfs_file *microcode_file;
const struct microcode *ucode_updates;
u32 eax, microcode_len;
u32 pf, rev, sig, update_size;
unsigned int x86_model, x86_family;
msr_t msr;
#ifdef __PRE_RAM__
microcode_file = walkcbfs_head((char *) MICROCODE_CBFS_FILE);
#else
microcode_file = cbfs_get_file(CBFS_DEFAULT_MEDIA,
MICROCODE_CBFS_FILE);
#endif
if (!microcode_file)
return NULL;
ucode_updates = CBFS_SUBHEADER(microcode_file);
microcode_len = ntohl(microcode_file->len);
/* CPUID sets MSR 0x8B iff a microcode update has been loaded. */
msr.lo = 0;
msr.hi = 0;
wrmsr(0x8B, msr);
eax = cpuid_eax(1);
msr = rdmsr(0x8B);
rev = msr.hi;
x86_model = (eax >>4) & 0x0f;
x86_family = (eax >>8) & 0x0f;
sig = eax;
pf = 0;
if ((x86_model >= 5)||(x86_family>6)) {
msr = rdmsr(0x17);
pf = 1 << ((msr.hi >> 18) & 7);
}
#if !defined(__ROMCC__)
/* If this code is compiled with ROMCC we're probably in
* the bootblock and don't have console output yet.
*/
printk(BIOS_DEBUG, "microcode: sig=0x%x pf=0x%x revision=0x%x\n",
sig, pf, rev);
#endif
while (microcode_len >= sizeof(*ucode_updates)) {
/* Newer microcode updates include a size field, whereas older
* containers set it at 0 and are exactly 2048 bytes long */
if (ucode_updates->total_size) {
update_size = ucode_updates->total_size;
} else {
#if !defined(__ROMCC__)
printk(BIOS_SPEW, "Microcode size field is 0\n");
#endif
update_size = 2048;
}
/* Checkpoint 1: The microcode update falls within CBFS */
if(update_size > microcode_len) {
#if !defined(__ROMCC__)
printk(BIOS_WARNING, "Microcode header corrupted!\n");
#endif
break;
}
if ((ucode_updates->sig == sig) && (ucode_updates->pf & pf))
return ucode_updates;
ucode_updates = (void *)((char *)ucode_updates + update_size);
microcode_len -= update_size;
}
/* ROMCC doesn't like NULL. */
return (void *)0;
}
void intel_update_microcode_from_cbfs(void)
{
const void *patch = intel_microcode_find();
#if !defined(__ROMCC__) && !defined(__PRE_RAM__)
spin_lock(µcode_lock);
#endif
intel_microcode_load_unlocked(patch);
#if !defined(__ROMCC__) && !defined(__PRE_RAM__)
spin_unlock(µcode_lock);
#endif
}
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