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/* SPDX-License-Identifier: GPL-2.0-only */
/* Microcode update for Intel PIII and later CPUs */
#include <stdint.h>
#include <stddef.h>
#include <cbfs.h>
#include <arch/cpu.h>
#include <console/console.h>
#include <cpu/x86/msr.h>
#include <cpu/intel/microcode.h>
#include <smp/spinlock.h>
DECLARE_SPIN_LOCK(microcode_lock)
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) {
printk(BIOS_INFO, "microcode: Update skipped, already up-to-date\n");
return;
}
#if ENV_RAMSTAGE
/*SoC specific check to update microcode*/
if (soc_skip_ucode_update(current_rev, m->rev)) {
printk(BIOS_DEBUG, "Skip microcode update\n");
return;
}
#endif
msr.lo = (unsigned long)m + sizeof(struct microcode);
msr.hi = 0;
wrmsr(IA32_BIOS_UPDT_TRIG, msr);
current_rev = read_microcode_rev();
if (current_rev == m->rev) {
printk(BIOS_INFO, "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);
return;
}
printk(BIOS_INFO, "microcode: Update failed\n");
}
uint32_t get_current_microcode_rev(void)
{
return read_microcode_rev();
}
uint32_t get_microcode_rev(const void *microcode)
{
return ((struct microcode *)microcode)->rev;
}
uint32_t get_microcode_size(const void *microcode)
{
return ((struct microcode *)microcode)->total_size;
}
uint32_t get_microcode_checksum(const void *microcode)
{
return ((struct microcode *)microcode)->cksum;
}
const void *intel_microcode_find(void)
{
const struct microcode *ucode_updates;
size_t microcode_len;
u32 eax;
u32 pf, rev, sig, update_size;
unsigned int x86_model, x86_family;
msr_t msr;
ucode_updates = cbfs_map(MICROCODE_CBFS_FILE, µcode_len);
if (ucode_updates == NULL)
return NULL;
/* CPUID sets MSR 0x8B if a microcode update has been loaded. */
msr.lo = 0;
msr.hi = 0;
wrmsr(IA32_BIOS_SIGN_ID, msr);
eax = cpuid_eax(1);
msr = rdmsr(IA32_BIOS_SIGN_ID);
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(IA32_PLATFORM_ID);
pf = 1 << ((msr.hi >> 18) & 7);
}
printk(BIOS_DEBUG, "microcode: sig=0x%x pf=0x%x revision=0x%x\n",
sig, pf, rev);
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 {
printk(BIOS_SPEW, "Microcode size field is 0\n");
update_size = 2048;
}
/* Checkpoint 1: The microcode update falls within CBFS */
if (update_size > microcode_len) {
printk(BIOS_WARNING, "Microcode header corrupted!\n");
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;
}
return NULL;
}
void intel_update_microcode_from_cbfs(void)
{
const void *patch = intel_microcode_find();
spin_lock(µcode_lock);
intel_microcode_load_unlocked(patch);
spin_unlock(µcode_lock);
}
#if ENV_RAMSTAGE
__weak int soc_skip_ucode_update(u32 currrent_patch_id,
u32 new_patch_id)
{
return 0;
}
#endif
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