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cpu_ucode_intel.c revision 1.8
      1 /* $NetBSD: cpu_ucode_intel.c,v 1.7 2015/05/11 08:24:50 msaitoh Exp $ */
      2 /*
      3  * Copyright (c) 2012 The NetBSD Foundation, Inc.
      4  * All rights reserved.
      5  *
      6  * This code is derived from software contributed to The NetBSD Foundation
      7  * by Matthias Drochner.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     19  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     20  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     21  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     22  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     28  * POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include <sys/cdefs.h>
     32 __KERNEL_RCSID(0, "$NetBSD: cpu_ucode_intel.c,v 1.7 2015/05/11 08:24:50 msaitoh Exp $");
     33 
     34 #include "opt_xen.h"
     35 #include "opt_cpu_ucode.h"
     36 #include "opt_compat_netbsd.h"
     37 
     38 #include <sys/param.h>
     39 #include <sys/conf.h>
     40 #include <sys/cpuio.h>
     41 #include <sys/cpu.h>
     42 #include <sys/kmem.h>
     43 #include <sys/xcall.h>
     44 
     45 #include <machine/cpufunc.h>
     46 #include <machine/specialreg.h>
     47 #include <x86/cpu_ucode.h>
     48 
     49 static void
     50 intel_getcurrentucode(uint32_t *ucodeversion, int *platformid)
     51 {
     52 	unsigned int unneeded_ids[4];
     53 	uint64_t msr;
     54 
     55 	kpreempt_disable();
     56 
     57 	wrmsr(MSR_BIOS_SIGN, 0);
     58 	x86_cpuid(0, unneeded_ids);
     59 	msr = rdmsr(MSR_BIOS_SIGN);
     60 	*ucodeversion = msr >> 32;
     61 
     62 	kpreempt_enable();
     63 
     64 	msr = rdmsr(MSR_IA32_PLATFORM_ID);
     65 	*platformid = ((int)(msr >> 50)) & 7;
     66 }
     67 
     68 int
     69 cpu_ucode_intel_get_version(struct cpu_ucode_version *ucode)
     70 {
     71 	struct cpu_info *ci = curcpu();
     72 	struct cpu_ucode_version_intel1 data;
     73 
     74 	if (ucode->loader_version != CPU_UCODE_LOADER_INTEL1 ||
     75 	    CPUID_TO_FAMILY(ci->ci_signature) < 6)
     76 		return EOPNOTSUPP;
     77 	if (!ucode->data)
     78 		return 0;
     79 
     80 	intel_getcurrentucode(&data.ucodeversion, &data.platformid);
     81 
     82 	return copyout(&data, ucode->data, sizeof(data));
     83 }
     84 
     85 int
     86 cpu_ucode_intel_firmware_open(firmware_handle_t *fwh, const char *fwname)
     87 {
     88 	const char *fw_path = "cpu_x86_intel1";
     89 	uint32_t ucodeversion, cpu_signature;
     90 	int platformid;
     91 	char cpuspec[11];
     92 
     93 	if (fwname != NULL && fwname[0] != '\0')
     94 		return firmware_open(fw_path, fwname, fwh);
     95 
     96 	cpu_signature = curcpu()->ci_signature;
     97 	if (CPUID_TO_FAMILY(cpu_signature) < 6)
     98 		return EOPNOTSUPP;
     99 
    100 	intel_getcurrentucode(&ucodeversion, &platformid);
    101 	snprintf(cpuspec, sizeof(cpuspec), "%08x-%d", cpu_signature,
    102 	    platformid);
    103 
    104 	return firmware_open(fw_path, cpuspec, fwh);
    105 }
    106 
    107 #ifndef XEN
    108 int
    109 cpu_ucode_intel_apply(struct cpu_ucode_softc *sc, int cpuno)
    110 {
    111 	uint32_t ucodetarget, oucodeversion, nucodeversion;
    112 	int platformid;
    113 	struct intel1_ucode_header *uh;
    114 	size_t newbufsize = 0;
    115 	int rv = 0;
    116 
    117 	if (sc->loader_version != CPU_UCODE_LOADER_INTEL1
    118 	    || cpuno != CPU_UCODE_CURRENT_CPU)
    119 		return EINVAL;
    120 
    121 	uh = (struct intel1_ucode_header *)(sc->sc_blob);
    122 	if (uh->uh_header_ver != 1 || uh->uh_loader_rev != 1)
    123 		return EINVAL;
    124 	ucodetarget = uh->uh_rev;
    125 
    126 	if ((uintptr_t)(sc->sc_blob) & 15) {
    127 		/* Make the buffer 16 byte aligned */
    128 		newbufsize = sc->sc_blobsize + 15;
    129 		uh = kmem_alloc(newbufsize, KM_SLEEP);
    130 		if (uh == NULL) {
    131 			printf("%s: memory allocation failed\n", __func__);
    132 			return EINVAL;
    133 		}
    134 		uh = (struct intel1_ucode_header *)roundup2((uintptr_t)uh, 16);
    135 		/* Copy to the new area */
    136 		memcpy(uh, sc->sc_blob, sc->sc_blobsize);
    137 	}
    138 
    139 	kpreempt_disable();
    140 
    141 	intel_getcurrentucode(&oucodeversion, &platformid);
    142 	if (oucodeversion >= ucodetarget) {
    143 		kpreempt_enable();
    144 		rv = EEXIST; /* ??? */
    145 		goto out;
    146 	}
    147 	wrmsr(MSR_BIOS_UPDT_TRIG, (uintptr_t)(sc->sc_blob) + 48);
    148 	intel_getcurrentucode(&nucodeversion, &platformid);
    149 
    150 	kpreempt_enable();
    151 
    152 	if (nucodeversion != ucodetarget) {
    153 		rv = EIO;
    154 		goto out;
    155 	}
    156 
    157 	printf("cpu %d: ucode 0x%x->0x%x\n", curcpu()->ci_index,
    158 	       oucodeversion, nucodeversion);
    159 out:
    160 	if (newbufsize != 0)
    161 		kmem_free(uh, newbufsize);
    162 	return rv;
    163 }
    164 #endif /* ! XEN */
    165