Merge commit '7928f4baf4ab3230557eb6289be68aa7a3003f38'

[unleashed.git] / arch / x86 / kernel / platform / i86pc / os / microcode.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 *
 * Copyright 2012 Nexenta Systems, Inc. All rights reserved.
 * Copyright (c) 2018, Joyent, Inc.
 */

#include <sys/asm_linkage.h>
#include <sys/bootconf.h>
#include <sys/cpuvar.h>
#include <sys/cmn_err.h>
#include <sys/controlregs.h>
#include <sys/debug.h>
#include <sys/kobj.h>
#include <sys/kobj_impl.h>
#include <sys/machsystm.h>
#include <sys/ontrap.h>
#include <sys/param.h>
#include <sys/machparam.h>
#include <sys/promif.h>
#include <sys/sysmacros.h>
#include <sys/systm.h>
#include <sys/types.h>
#include <sys/thread.h>
#include <sys/ucode.h>
#include <sys/x86_archext.h>
#include <sys/x_call.h>

/*
 * AMD-specific equivalence table
 */
static ucode_eqtbl_amd_t *ucode_eqtbl_amd;

/*
 * mcpu_ucode_info for the boot CPU.  Statically allocated.
 */
static struct cpu_ucode_info cpu_ucode_info0;

static ucode_file_t ucodefile;

static void* ucode_zalloc(processorid_t, size_t);
static void ucode_free(processorid_t, void *, size_t);

static int ucode_capable_amd(cpu_t *);
static int ucode_capable_intel(cpu_t *);

static ucode_errno_t ucode_extract_amd(ucode_update_t *, uint8_t *, int);
static ucode_errno_t ucode_extract_intel(ucode_update_t *, uint8_t *,
    int);

static void ucode_file_reset_amd(ucode_file_t *, processorid_t);
static void ucode_file_reset_intel(ucode_file_t *, processorid_t);

static uint32_t ucode_load_amd(ucode_file_t *, cpu_ucode_info_t *, cpu_t *);
static uint32_t ucode_load_intel(ucode_file_t *, cpu_ucode_info_t *, cpu_t *);


static int ucode_equiv_cpu_amd(cpu_t *, uint16_t *);

static ucode_errno_t ucode_locate_amd(cpu_t *, cpu_ucode_info_t *,
    ucode_file_t *);
static ucode_errno_t ucode_locate_intel(cpu_t *, cpu_ucode_info_t *,
    ucode_file_t *);

static ucode_errno_t ucode_match_amd(uint16_t, cpu_ucode_info_t *,
    ucode_file_amd_t *, int);
static ucode_errno_t ucode_match_intel(int, cpu_ucode_info_t *,
    ucode_header_intel_t *, ucode_ext_table_intel_t *);

static void ucode_read_rev_amd(cpu_ucode_info_t *);
static void ucode_read_rev_intel(cpu_ucode_info_t *);

static const struct ucode_ops ucode_amd = {
        MSR_AMD_PATCHLOADER,
        ucode_capable_amd,
        ucode_file_reset_amd,
        ucode_read_rev_amd,
        ucode_load_amd,
        ucode_validate_amd,
        ucode_extract_amd,
        ucode_locate_amd
};

static const struct ucode_ops ucode_intel = {
        MSR_INTC_UCODE_WRITE,
        ucode_capable_intel,
        ucode_file_reset_intel,
        ucode_read_rev_intel,
        ucode_load_intel,
        ucode_validate_intel,
        ucode_extract_intel,
        ucode_locate_intel
};

const struct ucode_ops *ucode;

static const char ucode_failure_fmt[] =
        "cpu%d: failed to update microcode from version 0x%x to 0x%x\n";
static const char ucode_success_fmt[] =
        "?cpu%d: microcode has been updated from version 0x%x to 0x%x\n";

/*
 * Force flag.  If set, the first microcode binary that matches
 * signature and platform id will be used for microcode update,
 * regardless of version.  Should only be used for debugging.
 */
int ucode_force_update = 0;

/*
 * Allocate space for mcpu_ucode_info in the machcpu structure
 * for all non-boot CPUs.
 */
void
ucode_alloc_space(cpu_t *cp)
{
        ASSERT(cp->cpu_id != 0);
        ASSERT(cp->cpu_m.mcpu_ucode_info == NULL);
        cp->cpu_m.mcpu_ucode_info =
            kmem_zalloc(sizeof (*cp->cpu_m.mcpu_ucode_info), KM_SLEEP);
}

void
ucode_free_space(cpu_t *cp)
{
        ASSERT(cp->cpu_m.mcpu_ucode_info != NULL);
        ASSERT(cp->cpu_m.mcpu_ucode_info != &cpu_ucode_info0);
        kmem_free(cp->cpu_m.mcpu_ucode_info,
            sizeof (*cp->cpu_m.mcpu_ucode_info));
        cp->cpu_m.mcpu_ucode_info = NULL;
}

/*
 * Called when we are done with microcode update on all processors to free up
 * space allocated for the microcode file.
 */
void
ucode_cleanup()
{
        if (ucode == NULL)
                return;

        ucode->file_reset(&ucodefile, -1);
}

/*
 * Allocate/free a buffer used to hold ucode data. Space for the boot CPU is
 * allocated with BOP_ALLOC() and does not require a free.
 */
static void*
ucode_zalloc(processorid_t id, size_t size)
{
        if (id)
                return (kmem_zalloc(size, KM_NOSLEEP));

        /* BOP_ALLOC() failure results in panic */
        return (BOP_ALLOC(bootops, NULL, size, MMU_PAGESIZE));
}

static void
ucode_free(processorid_t id, void* buf, size_t size)
{
        if (id)
                kmem_free(buf, size);
}

/*
 * Check whether or not a processor is capable of microcode operations
 * Returns 1 if it is capable, 0 if not.
 *
 * At this point we only support microcode update for:
 * - Intel processors family 6 and above, and
 * - AMD processors family 0x10 and above.
 *
 * We also assume that we don't support a mix of Intel and
 * AMD processors in the same box.
 *
 * An i86xpv guest domain or VM can't update the microcode.
 */

#define XPVDOMU_OR_HVM  \
        ((hwenv == HW_XEN_PV && !is_controldom()) || (hwenv & HW_VIRTUAL) != 0)

/*ARGSUSED*/
static int
ucode_capable_amd(cpu_t *cp)
{
        int hwenv = get_hwenv();

        if (XPVDOMU_OR_HVM)
                return (0);

        return (cpuid_getfamily(cp) >= 0x10);
}

static int
ucode_capable_intel(cpu_t *cp)
{
        int hwenv = get_hwenv();

        if (XPVDOMU_OR_HVM)
                return (0);

        return (cpuid_getfamily(cp) >= 6);
}

/*
 * Called when it is no longer necessary to keep the microcode around,
 * or when the cached microcode doesn't match the CPU being processed.
 */
static void
ucode_file_reset_amd(ucode_file_t *ufp, processorid_t id)
{
        ucode_file_amd_t *ucodefp = ufp->amd;

        if (ucodefp == NULL)
                return;

        ucode_free(id, ucodefp, sizeof (ucode_file_amd_t));
        ufp->amd = NULL;
}

static void
ucode_file_reset_intel(ucode_file_t *ufp, processorid_t id)
{
        ucode_file_intel_t *ucodefp = &ufp->intel;
        int total_size, body_size;

        if (ucodefp == NULL || ucodefp->uf_header == NULL)
                return;

        total_size = UCODE_TOTAL_SIZE_INTEL(ucodefp->uf_header->uh_total_size);
        body_size = UCODE_BODY_SIZE_INTEL(ucodefp->uf_header->uh_body_size);
        if (ucodefp->uf_body) {
                ucode_free(id, ucodefp->uf_body, body_size);
                ucodefp->uf_body = NULL;
        }

        if (ucodefp->uf_ext_table) {
                int size = total_size - body_size - UCODE_HEADER_SIZE_INTEL;

                ucode_free(id, ucodefp->uf_ext_table, size);
                ucodefp->uf_ext_table = NULL;
        }

        ucode_free(id, ucodefp->uf_header, UCODE_HEADER_SIZE_INTEL);
        ucodefp->uf_header = NULL;
}

/*
 * Find the equivalent CPU id in the equivalence table.
 */
static int
ucode_equiv_cpu_amd(cpu_t *cp, uint16_t *eq_sig)
{
        char name[MAXPATHLEN];
        intptr_t fd;
        int count;
        int offset = 0, cpi_sig = cpuid_getsig(cp);
        ucode_eqtbl_amd_t *eqtbl = ucode_eqtbl_amd;

        (void) snprintf(name, MAXPATHLEN, "/%s/%s/equivalence-table",
            UCODE_INSTALL_PATH, cpuid_getvendorstr(cp));

        /*
         * No kmem_zalloc() etc. available on boot cpu.
         */
        if (cp->cpu_id == 0) {
                if ((fd = kobj_open(name)) == -1)
                        return (EM_OPENFILE);
                /* ucode_zalloc() cannot fail on boot cpu */
                eqtbl = ucode_zalloc(cp->cpu_id, sizeof (*eqtbl));
                ASSERT(eqtbl);
                do {
                        count = kobj_read(fd, (int8_t *)eqtbl,
                            sizeof (*eqtbl), offset);
                        if (count != sizeof (*eqtbl)) {
                                (void) kobj_close(fd);
                                return (EM_HIGHERREV);
                        }
                        offset += count;
                } while (eqtbl->ue_inst_cpu && eqtbl->ue_inst_cpu != cpi_sig);
                (void) kobj_close(fd);
        }

        /*
         * If not already done, load the equivalence table.
         * Not done on boot CPU.
         */
        if (eqtbl == NULL) {
                struct _buf *eq;
                uint64_t size;

                if ((eq = kobj_open_file(name)) == (struct _buf *)-1)
                        return (EM_OPENFILE);

                if (kobj_get_filesize(eq, &size) < 0) {
                        kobj_close_file(eq);
                        return (EM_OPENFILE);
                }

                ucode_eqtbl_amd = kmem_zalloc(size, KM_NOSLEEP);
                if (ucode_eqtbl_amd == NULL) {
                        kobj_close_file(eq);
                        return (EM_NOMEM);
                }

                count = kobj_read_file(eq, (char *)ucode_eqtbl_amd, size, 0);
                kobj_close_file(eq);

                if (count != size)
                        return (EM_FILESIZE);
        }

        /* Get the equivalent CPU id. */
        if (cp->cpu_id)
                for (eqtbl = ucode_eqtbl_amd;
                    eqtbl->ue_inst_cpu && eqtbl->ue_inst_cpu != cpi_sig;
                    eqtbl++)
                        ;

        *eq_sig = eqtbl->ue_equiv_cpu;

        /* No equivalent CPU id found, assume outdated microcode file. */
        if (*eq_sig == 0)
                return (EM_HIGHERREV);

        return (EM_OK);
}

/*
 * xVM cannot check for the presence of PCI devices. Look for chipset-
 * specific microcode patches in the container file and disable them
 * by setting their CPU revision to an invalid value.
 */

/*
 * Populate the ucode file structure from microcode file corresponding to
 * this CPU, if exists.
 *
 * Return EM_OK on success, corresponding error code on failure.
 */
/*ARGSUSED*/
static ucode_errno_t
ucode_locate_amd(cpu_t *cp, cpu_ucode_info_t *uinfop, ucode_file_t *ufp)
{
        char name[MAXPATHLEN];
        intptr_t fd;
        int count, rc;
        ucode_file_amd_t *ucodefp = ufp->amd;

        uint16_t eq_sig = 0;
        int i;

        /* get equivalent CPU id */
        if ((rc = ucode_equiv_cpu_amd(cp, &eq_sig)) != EM_OK)
                return (rc);

        /*
         * Allocate a buffer for the microcode patch. If the buffer has been
         * allocated before, check for a matching microcode to avoid loading
         * the file again.
         */
        if (ucodefp == NULL)
                ucodefp = ucode_zalloc(cp->cpu_id, sizeof (*ucodefp));
        else if (ucode_match_amd(eq_sig, uinfop, ucodefp, sizeof (*ucodefp))
            == EM_OK)
                return (EM_OK);

        if (ucodefp == NULL)
                return (EM_NOMEM);

        ufp->amd = ucodefp;

        /*
         * Find the patch for this CPU. The patch files are named XXXX-YY, where
         * XXXX is the equivalent CPU id and YY is the running patch number.
         * Patches specific to certain chipsets are guaranteed to have lower
         * numbers than less specific patches, so we can just load the first
         * patch that matches.
         */

        for (i = 0; i < 0xff; i++) {
                (void) snprintf(name, MAXPATHLEN, "/%s/%s/%04X-%02X",
                    UCODE_INSTALL_PATH, cpuid_getvendorstr(cp), eq_sig, i);
                if ((fd = kobj_open(name)) == -1)
                        return (EM_NOMATCH);
                count = kobj_read(fd, (char *)ucodefp, sizeof (*ucodefp), 0);
                (void) kobj_close(fd);

                if (ucode_match_amd(eq_sig, uinfop, ucodefp, count) == EM_OK)
                        return (EM_OK);
        }
        return (EM_NOMATCH);
}

static ucode_errno_t
ucode_locate_intel(cpu_t *cp, cpu_ucode_info_t *uinfop, ucode_file_t *ufp)
{
        char            name[MAXPATHLEN];
        intptr_t        fd;
        int             count;
        int             header_size = UCODE_HEADER_SIZE_INTEL;
        int             cpi_sig = cpuid_getsig(cp);
        ucode_errno_t   rc = EM_OK;
        ucode_file_intel_t *ucodefp = &ufp->intel;

        ASSERT(ucode);

        /*
         * If the microcode matches the CPU we are processing, use it.
         */
        if (ucode_match_intel(cpi_sig, uinfop, ucodefp->uf_header,
            ucodefp->uf_ext_table) == EM_OK && ucodefp->uf_body != NULL) {
                return (EM_OK);
        }

        /*
         * Look for microcode file with the right name.
         */
        (void) snprintf(name, MAXPATHLEN, "/%s/%s/%08X-%02X",
            UCODE_INSTALL_PATH, cpuid_getvendorstr(cp), cpi_sig,
            uinfop->cui_platid);
        if ((fd = kobj_open(name)) == -1) {
                return (EM_OPENFILE);
        }

        /*
         * We found a microcode file for the CPU we are processing,
         * reset the microcode data structure and read in the new
         * file.
         */
        ucode->file_reset(ufp, cp->cpu_id);

        ucodefp->uf_header = ucode_zalloc(cp->cpu_id, header_size);
        if (ucodefp->uf_header == NULL)
                return (EM_NOMEM);

        count = kobj_read(fd, (char *)ucodefp->uf_header, header_size, 0);

        switch (count) {
        case UCODE_HEADER_SIZE_INTEL: {

                ucode_header_intel_t    *uhp = ucodefp->uf_header;
                uint32_t        offset = header_size;
                int             total_size, body_size, ext_size;
                uint32_t        sum = 0;

                /*
                 * Make sure that the header contains valid fields.
                 */
                if ((rc = ucode_header_validate_intel(uhp)) == EM_OK) {
                        total_size = UCODE_TOTAL_SIZE_INTEL(uhp->uh_total_size);
                        body_size = UCODE_BODY_SIZE_INTEL(uhp->uh_body_size);
                        ucodefp->uf_body = ucode_zalloc(cp->cpu_id, body_size);
                        if (ucodefp->uf_body == NULL) {
                                rc = EM_NOMEM;
                                break;
                        }

                        if (kobj_read(fd, (char *)ucodefp->uf_body,
                            body_size, offset) != body_size)
                                rc = EM_FILESIZE;
                }

                if (rc)
                        break;

                sum = ucode_checksum_intel(0, header_size,
                    (uint8_t *)ucodefp->uf_header);
                if (ucode_checksum_intel(sum, body_size, ucodefp->uf_body)) {
                        rc = EM_CHECKSUM;
                        break;
                }

                /*
                 * Check to see if there is extended signature table.
                 */
                offset = body_size + header_size;
                ext_size = total_size - offset;

                if (ext_size <= 0)
                        break;

                ucodefp->uf_ext_table = ucode_zalloc(cp->cpu_id, ext_size);
                if (ucodefp->uf_ext_table == NULL) {
                        rc = EM_NOMEM;
                        break;
                }

                if (kobj_read(fd, (char *)ucodefp->uf_ext_table,
                    ext_size, offset) != ext_size) {
                        rc = EM_FILESIZE;
                } else if (ucode_checksum_intel(0, ext_size,
                    (uint8_t *)(ucodefp->uf_ext_table))) {
                        rc = EM_CHECKSUM;
                } else {
                        int i;

                        ext_size -= UCODE_EXT_TABLE_SIZE_INTEL;
                        for (i = 0; i < ucodefp->uf_ext_table->uet_count;
                            i++) {
                                if (ucode_checksum_intel(0,
                                    UCODE_EXT_SIG_SIZE_INTEL,
                                    (uint8_t *)(&(ucodefp->uf_ext_table->
                                    uet_ext_sig[i])))) {
                                        rc = EM_CHECKSUM;
                                        break;
                                }
                        }
                }
                break;
        }

        default:
                rc = EM_FILESIZE;
                break;
        }

        kobj_close(fd);

        if (rc != EM_OK)
                return (rc);

        rc = ucode_match_intel(cpi_sig, uinfop, ucodefp->uf_header,
            ucodefp->uf_ext_table);

        return (rc);
}

static ucode_errno_t
ucode_match_amd(uint16_t eq_sig, cpu_ucode_info_t *uinfop,
    ucode_file_amd_t *ucodefp, int size)
{
        ucode_header_amd_t *uh;

        if (ucodefp == NULL || size < sizeof (ucode_header_amd_t))
                return (EM_NOMATCH);

        uh = &ucodefp->uf_header;

        /*
         * Don't even think about loading patches that would require code
         * execution. Does not apply to patches for family 0x14 and beyond.
         */
        if (uh->uh_cpu_rev < 0x5000 &&
            size > offsetof(ucode_file_amd_t, uf_code_present) &&
            ucodefp->uf_code_present)
                return (EM_NOMATCH);

        if (eq_sig != uh->uh_cpu_rev)
                return (EM_NOMATCH);

        if (uh->uh_nb_id) {
                cmn_err(CE_WARN, "ignoring northbridge-specific ucode: "
                    "chipset id %x, revision %x", uh->uh_nb_id, uh->uh_nb_rev);
                return (EM_NOMATCH);
        }

        if (uh->uh_sb_id) {
                cmn_err(CE_WARN, "ignoring southbridge-specific ucode: "
                    "chipset id %x, revision %x", uh->uh_sb_id, uh->uh_sb_rev);
                return (EM_NOMATCH);
        }

        if (uh->uh_patch_id <= uinfop->cui_rev && !ucode_force_update)
                return (EM_HIGHERREV);

        return (EM_OK);
}

/*
 * Returns 1 if the microcode is for this processor; 0 otherwise.
 */
static ucode_errno_t
ucode_match_intel(int cpi_sig, cpu_ucode_info_t *uinfop,
    ucode_header_intel_t *uhp, ucode_ext_table_intel_t *uetp)
{
        if (uhp == NULL)
                return (EM_NOMATCH);

        if (UCODE_MATCH_INTEL(cpi_sig, uhp->uh_signature,
            uinfop->cui_platid, uhp->uh_proc_flags)) {

                if (uinfop->cui_rev >= uhp->uh_rev && !ucode_force_update)
                        return (EM_HIGHERREV);

                return (EM_OK);
        }

        if (uetp != NULL) {
                int i;

                for (i = 0; i < uetp->uet_count; i++) {
                        ucode_ext_sig_intel_t *uesp;

                        uesp = &uetp->uet_ext_sig[i];

                        if (UCODE_MATCH_INTEL(cpi_sig, uesp->ues_signature,
                            uinfop->cui_platid, uesp->ues_proc_flags)) {

                                if (uinfop->cui_rev >= uhp->uh_rev &&
                                    !ucode_force_update)
                                        return (EM_HIGHERREV);

                                return (EM_OK);
                        }
                }
        }

        return (EM_NOMATCH);
}

/*ARGSUSED*/
static int
ucode_write(xc_arg_t arg1, xc_arg_t unused2, xc_arg_t unused3)
{
        ucode_update_t *uusp = (ucode_update_t *)arg1;
        cpu_ucode_info_t *uinfop = CPU->cpu_m.mcpu_ucode_info;
        on_trap_data_t otd;

        ASSERT(ucode);
        ASSERT(uusp->ucodep);

        /*
         * Check one more time to see if it is really necessary to update
         * microcode just in case this is a hyperthreaded processor where
         * the threads share the same microcode.
         */
        if (!ucode_force_update) {
                ucode->read_rev(uinfop);
                uusp->new_rev = uinfop->cui_rev;
                if (uinfop->cui_rev >= uusp->expected_rev)
                        return (0);
        }

        if (!on_trap(&otd, OT_DATA_ACCESS)) {
                /*
                 * On some platforms a cache invalidation is required for the
                 * ucode update to be successful due to the parts of the
                 * processor that the microcode is updating.
                 */
                invalidate_cache();
                wrmsr(ucode->write_msr, (uintptr_t)uusp->ucodep);
        }

        no_trap();
        ucode->read_rev(uinfop);
        uusp->new_rev = uinfop->cui_rev;

        return (0);
}

/*ARGSUSED*/
static uint32_t
ucode_load_amd(ucode_file_t *ufp, cpu_ucode_info_t *uinfop, cpu_t *cp)
{
        ucode_file_amd_t *ucodefp = ufp->amd;
        on_trap_data_t otd;

        ASSERT(ucode);
        ASSERT(ucodefp);

        kpreempt_disable();
        if (on_trap(&otd, OT_DATA_ACCESS)) {
                no_trap();
                kpreempt_enable();
                return (0);
        }
        wrmsr(ucode->write_msr, (uintptr_t)ucodefp);
        no_trap();
        ucode->read_rev(uinfop);
        kpreempt_enable();

        return (ucodefp->uf_header.uh_patch_id);
}

/*ARGSUSED2*/
static uint32_t
ucode_load_intel(ucode_file_t *ufp, cpu_ucode_info_t *uinfop, cpu_t *cp)
{
        ucode_file_intel_t *ucodefp = &ufp->intel;

        ASSERT(ucode);

        kpreempt_disable();
        /*
         * On some platforms a cache invalidation is required for the
         * ucode update to be successful due to the parts of the
         * processor that the microcode is updating.
         */
        invalidate_cache();
        wrmsr(ucode->write_msr, (uintptr_t)ucodefp->uf_body);
        ucode->read_rev(uinfop);
        kpreempt_enable();

        return (ucodefp->uf_header->uh_rev);
}



static void
ucode_read_rev_amd(cpu_ucode_info_t *uinfop)
{
        uinfop->cui_rev = rdmsr(MSR_AMD_PATCHLEVEL);
}

static void
ucode_read_rev_intel(cpu_ucode_info_t *uinfop)
{
        struct cpuid_regs crs;

        /*
         * The Intel 64 and IA-32 Architecture Software Developer's Manual
         * recommends that MSR_INTC_UCODE_REV be loaded with 0 first, then
         * execute cpuid to guarantee the correct reading of this register.
         */
        wrmsr(MSR_INTC_UCODE_REV, 0);
        (void) __cpuid_insn(&crs);
        uinfop->cui_rev = (rdmsr(MSR_INTC_UCODE_REV) >> INTC_UCODE_REV_SHIFT);
}

static ucode_errno_t
ucode_extract_amd(ucode_update_t *uusp, uint8_t *ucodep, int size)
{
        uint32_t *ptr = (uint32_t *)ucodep;
        ucode_eqtbl_amd_t *eqtbl;
        ucode_file_amd_t *ufp;
        int count;
        int higher = 0;
        ucode_errno_t rc = EM_NOMATCH;
        uint16_t eq_sig;

        /* skip over magic number & equivalence table header */
        ptr += 2; size -= 8;

        count = *ptr++; size -= 4;
        for (eqtbl = (ucode_eqtbl_amd_t *)ptr;
            eqtbl->ue_inst_cpu && eqtbl->ue_inst_cpu != uusp->sig;
            eqtbl++)
                ;

        eq_sig = eqtbl->ue_equiv_cpu;

        /* No equivalent CPU id found, assume outdated microcode file. */
        if (eq_sig == 0)
                return (EM_HIGHERREV);

        /* Use the first microcode patch that matches. */
        do {
                ptr += count >> 2; size -= count;

                if (!size)
                        return (higher ? EM_HIGHERREV : EM_NOMATCH);

                ptr++; size -= 4;
                count = *ptr++; size -= 4;
                ufp = (ucode_file_amd_t *)ptr;

                rc = ucode_match_amd(eq_sig, &uusp->info, ufp, count);
                if (rc == EM_HIGHERREV)
                        higher = 1;
        } while (rc != EM_OK);

        uusp->ucodep = (uint8_t *)ufp;
        uusp->usize = count;
        uusp->expected_rev = ufp->uf_header.uh_patch_id;

        return (EM_OK);
}

static ucode_errno_t
ucode_extract_intel(ucode_update_t *uusp, uint8_t *ucodep, int size)
{
        uint32_t        header_size = UCODE_HEADER_SIZE_INTEL;
        int             remaining;
        int             found = 0;
        ucode_errno_t   search_rc = EM_NOMATCH; /* search result */

        /*
         * Go through the whole buffer in case there are
         * multiple versions of matching microcode for this
         * processor.
         */
        for (remaining = size; remaining > 0; ) {
                int     total_size, body_size, ext_size;
                uint8_t *curbuf = &ucodep[size - remaining];
                ucode_header_intel_t *uhp = (ucode_header_intel_t *)curbuf;
                ucode_ext_table_intel_t *uetp = NULL;
                ucode_errno_t tmprc;

                total_size = UCODE_TOTAL_SIZE_INTEL(uhp->uh_total_size);
                body_size = UCODE_BODY_SIZE_INTEL(uhp->uh_body_size);
                ext_size = total_size - (header_size + body_size);

                if (ext_size > 0)
                        uetp = (ucode_ext_table_intel_t *)
                            &curbuf[header_size + body_size];

                tmprc = ucode_match_intel(uusp->sig, &uusp->info, uhp, uetp);

                /*
                 * Since we are searching through a big file
                 * containing microcode for pretty much all the
                 * processors, we are bound to get EM_NOMATCH
                 * at one point.  However, if we return
                 * EM_NOMATCH to users, it will really confuse
                 * them.  Therefore, if we ever find a match of
                 * a lower rev, we will set return code to
                 * EM_HIGHERREV.
                 */
                if (tmprc == EM_HIGHERREV)
                        search_rc = EM_HIGHERREV;

                if (tmprc == EM_OK &&
                    uusp->expected_rev < uhp->uh_rev) {
                        uusp->ucodep = (uint8_t *)&curbuf[header_size];
                        uusp->usize =
                            UCODE_TOTAL_SIZE_INTEL(uhp->uh_total_size);
                        uusp->expected_rev = uhp->uh_rev;
                        found = 1;
                }

                remaining -= total_size;
        }

        if (!found)
                return (search_rc);

        return (EM_OK);
}
/*
 * Entry point to microcode update from the ucode_drv driver.
 *
 * Returns EM_OK on success, corresponding error code on failure.
 */
ucode_errno_t
ucode_update(uint8_t *ucodep, int size)
{
        int             found = 0;
        processorid_t   id;
        ucode_update_t  cached = { 0 };
        ucode_update_t  *cachedp = NULL;
        ucode_errno_t   rc = EM_OK;
        ucode_errno_t   search_rc = EM_NOMATCH; /* search result */
        cpuset_t cpuset;

        ASSERT(ucode);
        ASSERT(ucodep);
        CPUSET_ZERO(cpuset);

        if (!ucode->capable(CPU))
                return (EM_NOTSUP);

        mutex_enter(&cpu_lock);

        for (id = 0; id < max_ncpus; id++) {
                cpu_t *cpu;
                ucode_update_t uus = { 0 };
                ucode_update_t *uusp = &uus;

                /*
                 * If there is no such CPU or it is not xcall ready, skip it.
                 */
                if ((cpu = cpu_get(id)) == NULL ||
                    !(cpu->cpu_flags & CPU_READY))
                        continue;

                uusp->sig = cpuid_getsig(cpu);
                bcopy(cpu->cpu_m.mcpu_ucode_info, &uusp->info,
                    sizeof (uusp->info));

                /*
                 * If the current CPU has the same signature and platform
                 * id as the previous one we processed, reuse the information.
                 */
                if (cachedp && cachedp->sig == cpuid_getsig(cpu) &&
                    cachedp->info.cui_platid == uusp->info.cui_platid) {
                        uusp->ucodep = cachedp->ucodep;
                        uusp->expected_rev = cachedp->expected_rev;
                        /*
                         * Intuitively we should check here to see whether the
                         * running microcode rev is >= the expected rev, and
                         * quit if it is.  But we choose to proceed with the
                         * xcall regardless of the running version so that
                         * the other threads in an HT processor can update
                         * the cpu_ucode_info structure in machcpu.
                         */
                } else if ((search_rc = ucode->extract(uusp, ucodep, size))
                    == EM_OK) {
                        bcopy(uusp, &cached, sizeof (cached));
                        cachedp = &cached;
                        found = 1;
                }

                /* Nothing to do */
                if (uusp->ucodep == NULL)
                        continue;


                CPUSET_ADD(cpuset, id);
                kpreempt_disable();
                xc_sync((xc_arg_t)uusp, 0, 0, CPUSET2BV(cpuset), ucode_write);
                kpreempt_enable();
                CPUSET_DEL(cpuset, id);

                if (uusp->new_rev != 0 && uusp->info.cui_rev == uusp->new_rev &&
                    !ucode_force_update) {
                        rc = EM_HIGHERREV;
                } else if ((uusp->new_rev == 0) || (uusp->expected_rev != 0 &&
                    uusp->expected_rev != uusp->new_rev)) {
                        cmn_err(CE_WARN, ucode_failure_fmt,
                            id, uusp->info.cui_rev, uusp->expected_rev);
                        rc = EM_UPDATE;
                } else {
                        cmn_err(CE_CONT, ucode_success_fmt,
                            id, uusp->info.cui_rev, uusp->new_rev);
                }
        }

        mutex_exit(&cpu_lock);

        if (!found) {
                rc = search_rc;
        } else if (rc == EM_OK) {
                cpuid_post_ucodeadm();
        }

        return (rc);
}

/*
 * Initialize mcpu_ucode_info, and perform microcode update if necessary.
 * This is the entry point from boot path where pointer to CPU structure
 * is available.
 *
 * cpuid_info must be initialized before ucode_check can be called.
 */
void
ucode_check(cpu_t *cp)
{
        cpu_ucode_info_t *uinfop;
        ucode_errno_t rc = EM_OK;
        uint32_t new_rev = 0;

        ASSERT(cp);
        /*
         * Space statically allocated for BSP, ensure pointer is set
         */
        if (cp->cpu_id == 0 && cp->cpu_m.mcpu_ucode_info == NULL)
                cp->cpu_m.mcpu_ucode_info = &cpu_ucode_info0;

        uinfop = cp->cpu_m.mcpu_ucode_info;
        ASSERT(uinfop);

        /* set up function pointers if not already done */
        if (!ucode)
                switch (cpuid_getvendor(cp)) {
                case X86_VENDOR_AMD:
                        ucode = &ucode_amd;
                        break;
                case X86_VENDOR_Intel:
                        ucode = &ucode_intel;
                        break;
                default:
                        ucode = NULL;
                        return;
                }

        if (!ucode->capable(cp))
                return;

        /*
         * The MSR_INTC_PLATFORM_ID is supported in Celeron and Xeon
         * (Family 6, model 5 and above) and all processors after.
         */
        if ((cpuid_getvendor(cp) == X86_VENDOR_Intel) &&
            ((cpuid_getmodel(cp) >= 5) || (cpuid_getfamily(cp) > 6))) {
                uinfop->cui_platid = 1 << ((rdmsr(MSR_INTC_PLATFORM_ID) >>
                    INTC_PLATFORM_ID_SHIFT) & INTC_PLATFORM_ID_MASK);
        }

        ucode->read_rev(uinfop);


        /*
         * Check to see if we need ucode update
         */
        if ((rc = ucode->locate(cp, uinfop, &ucodefile)) == EM_OK) {
                new_rev = ucode->load(&ucodefile, uinfop, cp);

                if (uinfop->cui_rev != new_rev)
                        cmn_err(CE_WARN, ucode_failure_fmt, cp->cpu_id,
                            uinfop->cui_rev, new_rev);
        }

        /*
         * If we fail to find a match for any reason, free the file structure
         * just in case we have read in a partial file.
         *
         * Since the scratch memory for holding the microcode for the boot CPU
         * came from BOP_ALLOC, we will reset the data structure as if we
         * never did the allocation so we don't have to keep track of this
         * special chunk of memory.  We free the memory used for the rest
         * of the CPUs in start_other_cpus().
         */
        if (rc != EM_OK || cp->cpu_id == 0)
                ucode->file_reset(&ucodefile, cp->cpu_id);
}

/*
 * Returns microcode revision from the machcpu structure.
 */
ucode_errno_t
ucode_get_rev(uint32_t *revp)
{
        int i;

        ASSERT(ucode);
        ASSERT(revp);

        if (!ucode->capable(CPU))
                return (EM_NOTSUP);

        mutex_enter(&cpu_lock);
        for (i = 0; i < max_ncpus; i++) {
                cpu_t *cpu;

                if ((cpu = cpu_get(i)) == NULL)
                        continue;

                revp[i] = cpu->cpu_m.mcpu_ucode_info->cui_rev;
        }
        mutex_exit(&cpu_lock);

        return (EM_OK);
}