// SPDX-License-Identifier: GPL-2.0-or-later/* * Intel CPU Microcode Update Driver for Linux * * Copyright (C) 2000-2006 Tigran Aivazian <aivazian.tigran@gmail.com> * 2006 Shaohua Li <shaohua.li@intel.com> * * Intel CPU microcode early update for Linux * * Copyright (C) 2012 Fenghua Yu <fenghua.yu@intel.com> * H Peter Anvin" <hpa@zytor.com> */ /* * This needs to be before all headers so that pr_debug in printk.h doesn't turn * printk calls into no_printk(). * *#define DEBUG */#define pr_fmt(fmt) "microcode: " fmt #include <linux/earlycpio.h>#include <linux/firmware.h>#include <linux/uaccess.h>#include <linux/vmalloc.h>#include <linux/initrd.h>#include <linux/kernel.h>#include <linux/slab.h>#include <linux/cpu.h>#include <linux/uio.h>#include <linux/mm.h> #include <asm/microcode_intel.h>#include <asm/intel-family.h>#include <asm/processor.h>#include <asm/tlbflush.h>#include <asm/setup.h>#include <asm/msr.h> static const char ucode_path[] = "kernel/x86/microcode/GenuineIntel.bin"; /* Current microcode patch used in early patching on the APs. */static struct microcode_intel *intel_ucode_patch; /* last level cache size per core */static int llc_size_per_core; static inline bool cpu_signatures_match(unsigned int s1, unsigned int p1, unsigned int s2, unsigned int p2){ if (s1 != s2) return false; /* Processor flags are either both 0 ... */ if (!p1 && !p2) return true; /* ... or they intersect. */ return p1 & p2;} /* * Returns 1 if update has been found, 0 otherwise. */static int find_matching_signature(void *mc, unsigned int csig, int cpf){ struct microcode_header_intel *mc_hdr = mc; struct extended_sigtable *ext_hdr; struct extended_signature *ext_sig; int i; if (cpu_signatures_match(csig, cpf, mc_hdr->sig, mc_hdr->pf)) return 1; /* Look for ext. headers: */ if (get_totalsize(mc_hdr) <= get_datasize(mc_hdr) + MC_HEADER_SIZE) return 0; ext_hdr = mc + get_datasize(mc_hdr) + MC_HEADER_SIZE; ext_sig = (void *)ext_hdr + EXT_HEADER_SIZE; for (i = 0; i < ext_hdr->count; i++) { if (cpu_signatures_match(csig, cpf, ext_sig->sig, ext_sig->pf)) return 1; ext_sig++; } return 0;} /* * Returns 1 if update has been found, 0 otherwise. */static int has_newer_microcode(void *mc, unsigned int csig, int cpf, int new_rev){ struct microcode_header_intel *mc_hdr = mc; if (mc_hdr->rev <= new_rev) return 0; return find_matching_signature(mc, csig, cpf);} /* * Given CPU signature and a microcode patch, this function finds if the * microcode patch has matching family and model with the CPU. * * %true - if there's a match * %false - otherwise */static bool microcode_matches(struct microcode_header_intel *mc_header, unsigned long sig){ unsigned long total_size = get_totalsize(mc_header); unsigned long data_size = get_datasize(mc_header); struct extended_sigtable *ext_header; unsigned int fam_ucode, model_ucode; struct extended_signature *ext_sig; unsigned int fam, model; int ext_sigcount, i; fam = x86_family(sig); model = x86_model(sig); fam_ucode = x86_family(mc_header->sig); model_ucode = x86_model(mc_header->sig); if (fam == fam_ucode && model == model_ucode) return true; /* Look for ext. headers: */ if (total_size <= data_size + MC_HEADER_SIZE) return false; ext_header = (void *) mc_header + data_size + MC_HEADER_SIZE; ext_sig = (void *)ext_header + EXT_HEADER_SIZE; ext_sigcount = ext_header->count; for (i = 0; i < ext_sigcount; i++) { fam_ucode = x86_family(ext_sig->sig); model_ucode = x86_model(ext_sig->sig); if (fam == fam_ucode && model == model_ucode) return true; ext_sig++; } return false;} static struct ucode_patch *memdup_patch(void *data, unsigned int size){ struct ucode_patch *p; p = kzalloc(sizeof(struct ucode_patch), GFP_KERNEL); if (!p) return NULL; p->data = kmemdup(data, size, GFP_KERNEL); if (!p->data) { kfree(p); return NULL; } return p;} static void save_microcode_patch(void *data, unsigned int size){ struct microcode_header_intel *mc_hdr, *mc_saved_hdr; struct ucode_patch *iter, *tmp, *p = NULL; bool prev_found = false; unsigned int sig, pf; mc_hdr = (struct microcode_header_intel *)data; list_for_each_entry_safe(iter, tmp, µcode_cache, plist) { mc_saved_hdr = (struct microcode_header_intel *)iter->data; sig = mc_saved_hdr->sig; pf = mc_saved_hdr->pf; if (find_matching_signature(data, sig, pf)) { prev_found = true; if (mc_hdr->rev <= mc_saved_hdr->rev) continue; p = memdup_patch(data, size); if (!p) pr_err("Error allocating buffer %p\n", data); else { list_replace(&iter->plist, &p->plist); kfree(iter->data); kfree(iter); } } } /* * There weren't any previous patches found in the list cache; save the * newly found. */ if (!prev_found) { p = memdup_patch(data, size); if (!p) pr_err("Error allocating buffer for %p\n", data); else list_add_tail(&p->plist, µcode_cache); } if (!p) return; /* * Save for early loading. On 32-bit, that needs to be a physical * address as the APs are running from physical addresses, before * paging has been enabled. */ if (IS_ENABLED(CONFIG_X86_32)) intel_ucode_patch = (struct microcode_intel *)__pa_nodebug(p->data); else intel_ucode_patch = p->data;} static int microcode_sanity_check(void *mc, int print_err){ unsigned long total_size, data_size, ext_table_size; struct microcode_header_intel *mc_header = mc; struct extended_sigtable *ext_header = NULL; u32 sum, orig_sum, ext_sigcount = 0, i; struct extended_signature *ext_sig; total_size = get_totalsize(mc_header); data_size = get_datasize(mc_header); if (data_size + MC_HEADER_SIZE > total_size) { if (print_err) pr_err("Error: bad microcode data file size.\n"); return -EINVAL; } if (mc_header->ldrver != 1 || mc_header->hdrver != 1) { if (print_err) pr_err("Error: invalid/unknown microcode update format.\n"); return -EINVAL; } ext_table_size = total_size - (MC_HEADER_SIZE + data_size); if (ext_table_size) { u32 ext_table_sum = 0; u32 *ext_tablep; if ((ext_table_size < EXT_HEADER_SIZE) || ((ext_table_size - EXT_HEADER_SIZE) % EXT_SIGNATURE_SIZE)) { if (print_err) pr_err("Error: truncated extended signature table.\n"); return -EINVAL; } ext_header = mc + MC_HEADER_SIZE + data_size; if (ext_table_size != exttable_size(ext_header)) { if (print_err) pr_err("Error: extended signature table size mismatch.\n"); return -EFAULT; } ext_sigcount = ext_header->count; /* * Check extended table checksum: the sum of all dwords that * comprise a valid table must be 0. */ ext_tablep = (u32 *)ext_header; i = ext_table_size / sizeof(u32); while (i--) ext_table_sum += ext_tablep[i]; if (ext_table_sum) { if (print_err) pr_warn("Bad extended signature table checksum, aborting.\n"); return -EINVAL; } } /* * Calculate the checksum of update data and header. The checksum of * valid update data and header including the extended signature table * must be 0. */ orig_sum = 0; i = (MC_HEADER_SIZE + data_size) / sizeof(u32); while (i--) orig_sum += ((u32 *)mc)[i]; if (orig_sum) { if (print_err) pr_err("Bad microcode data checksum, aborting.\n"); return -EINVAL; } if (!ext_table_size) return 0; /* * Check extended signature checksum: 0 => valid. */ for (i = 0; i < ext_sigcount; i++) { ext_sig = (void *)ext_header + EXT_HEADER_SIZE + EXT_SIGNATURE_SIZE * i; sum = (mc_header->sig + mc_header->pf + mc_header->cksum) - (ext_sig->sig + ext_sig->pf + ext_sig->cksum); if (sum) { if (print_err) pr_err("Bad extended signature checksum, aborting.\n"); return -EINVAL; } } return 0;} /* * Get microcode matching with BSP's model. Only CPUs with the same model as * BSP can stay in the platform. */static struct microcode_intel *scan_microcode(void *data, size_t size, struct ucode_cpu_info *uci, bool save){ struct microcode_header_intel *mc_header; struct microcode_intel *patch = NULL; unsigned int mc_size; while (size) { if (size < sizeof(struct microcode_header_intel)) break; mc_header = (struct microcode_header_intel *)data; mc_size = get_totalsize(mc_header); if (!mc_size || mc_size > size || microcode_sanity_check(data, 0) < 0) break; size -= mc_size; if (!microcode_matches(mc_header, uci->cpu_sig.sig)) { data += mc_size; continue; } if (save) { save_microcode_patch(data, mc_size); goto next; } if (!patch) { if (!has_newer_microcode(data, uci->cpu_sig.sig, uci->cpu_sig.pf, uci->cpu_sig.rev)) goto next; } else { struct microcode_header_intel *phdr = &patch->hdr; if (!has_newer_microcode(data, phdr->sig, phdr->pf, phdr->rev)) goto next; } /* We have a newer patch, save it. */ patch = data; next: data += mc_size; } if (size) return NULL; return patch;} static int collect_cpu_info_early(struct ucode_cpu_info *uci){ unsigned int val[2]; unsigned int family, model; struct cpu_signature csig = { 0 }; unsigned int eax, ebx, ecx, edx; memset(uci, 0, sizeof(*uci)); eax = 0x00000001; ecx = 0; native_cpuid(&eax, &ebx, &ecx, &edx); csig.sig = eax; family = x86_family(eax); model = x86_model(eax); if ((model >= 5) || (family > 6)) { /* get processor flags from MSR 0x17 */ native_rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]); csig.pf = 1 << ((val[1] >> 18) & 7); } csig.rev = intel_get_microcode_revision(); uci->cpu_sig = csig; uci->valid = 1; return 0;} static void show_saved_mc(void){#ifdef DEBUG int i = 0, j; unsigned int sig, pf, rev, total_size, data_size, date; struct ucode_cpu_info uci; struct ucode_patch *p; if (list_empty(µcode_cache)) { pr_debug("no microcode data saved.\n"); return; } collect_cpu_info_early(&uci); sig = uci.cpu_sig.sig; pf = uci.cpu_sig.pf; rev = uci.cpu_sig.rev; pr_debug("CPU: sig=0x%x, pf=0x%x, rev=0x%x\n", sig, pf, rev); list_for_each_entry(p, µcode_cache, plist) { struct microcode_header_intel *mc_saved_header; struct extended_sigtable *ext_header; struct extended_signature *ext_sig; int ext_sigcount; mc_saved_header = (struct microcode_header_intel *)p->data; sig = mc_saved_header->sig; pf = mc_saved_header->pf; rev = mc_saved_header->rev; date = mc_saved_header->date; total_size = get_totalsize(mc_saved_header); data_size = get_datasize(mc_saved_header); pr_debug("mc_saved[%d]: sig=0x%x, pf=0x%x, rev=0x%x, total size=0x%x, date = %04x-%02x-%02x\n", i++, sig, pf, rev, total_size, date & 0xffff, date >> 24, (date >> 16) & 0xff); /* Look for ext. headers: */ if (total_size <= data_size + MC_HEADER_SIZE) continue; ext_header = (void *)mc_saved_header + data_size + MC_HEADER_SIZE; ext_sigcount = ext_header->count; ext_sig = (void *)ext_header + EXT_HEADER_SIZE; for (j = 0; j < ext_sigcount; j++) { sig = ext_sig->sig; pf = ext_sig->pf; pr_debug("\tExtended[%d]: sig=0x%x, pf=0x%x\n", j, sig, pf); ext_sig++; } }#endif} /* * Save this microcode patch. It will be loaded early when a CPU is * hot-added or resumes. */static void save_mc_for_early(u8 *mc, unsigned int size){ /* Synchronization during CPU hotplug. */ static DEFINE_MUTEX(x86_cpu_microcode_mutex); mutex_lock(&x86_cpu_microcode_mutex); save_microcode_patch(mc, size); show_saved_mc(); mutex_unlock(&x86_cpu_microcode_mutex);} static bool load_builtin_intel_microcode(struct cpio_data *cp){Lines 1–500 of 1045. Load more
// SPDX-License-Identifier: GPL-2.0-or-later /* * Intel CPU Microcode Update Driver for Linux * * Copyright (C) 2000-2006 Tigran Aivazian <aivazian.tigran@gmail.com> * 2006 Shaohua Li <shaohua.li@intel.com> * * Intel CPU microcode early update for Linux * * Copyright (C) 2012 Fenghua Yu <fenghua.yu@intel.com> * H Peter Anvin" <hpa@zytor.com> */ /* * This needs to be before all headers so that pr_debug in printk.h doesn't turn * printk calls into no_printk(). * *#define DEBUG */ #define pr_fmt(fmt) "microcode: " fmt #include <linux/earlycpio.h> #include <linux/firmware.h> #include <linux/uaccess.h> #include <linux/vmalloc.h> #include <linux/initrd.h> #include <linux/kernel.h> #include <linux/slab.h> #include <linux/cpu.h> #include <linux/uio.h> #include <linux/mm.h> #include <asm/microcode_intel.h> #include <asm/intel-family.h> #include <asm/processor.h> #include <asm/tlbflush.h> #include <asm/setup.h> #include <asm/msr.h> static const char ucode_path[] = "kernel/x86/microcode/GenuineIntel.bin"; /* Current microcode patch used in early patching on the APs. */ static struct microcode_intel *intel_ucode_patch; /* last level cache size per core */ static int llc_size_per_core; static inline bool cpu_signatures_match(unsigned int s1, unsigned int p1, unsigned int s2, unsigned int p2) { if (s1 != s2) return false; /* Processor flags are either both 0 ... */ if (!p1 && !p2) return true; /* ... or they intersect. */ return p1 & p2; } /* * Returns 1 if update has been found, 0 otherwise. */ static int find_matching_signature(void *mc, unsigned int csig, int cpf) { struct microcode_header_intel *mc_hdr = mc; struct extended_sigtable *ext_hdr; struct extended_signature *ext_sig; int i; if (cpu_signatures_match(csig, cpf, mc_hdr->sig, mc_hdr->pf)) return 1; /* Look for ext. headers: */ if (get_totalsize(mc_hdr) <= get_datasize(mc_hdr) + MC_HEADER_SIZE) return 0; ext_hdr = mc + get_datasize(mc_hdr) + MC_HEADER_SIZE; ext_sig = (void *)ext_hdr + EXT_HEADER_SIZE; for (i = 0; i < ext_hdr->count; i++) { if (cpu_signatures_match(csig, cpf, ext_sig->sig, ext_sig->pf)) return 1; ext_sig++; } return 0; } /* * Returns 1 if update has been found, 0 otherwise. */ static int has_newer_microcode(void *mc, unsigned int csig, int cpf, int new_rev) { struct microcode_header_intel *mc_hdr = mc; if (mc_hdr->rev <= new_rev) return 0; return find_matching_signature(mc, csig, cpf); } /* * Given CPU signature and a microcode patch, this function finds if the * microcode patch has matching family and model with the CPU. * * %true - if there's a match * %false - otherwise */ static bool microcode_matches(struct microcode_header_intel *mc_header, unsigned long sig) { unsigned long total_size = get_totalsize(mc_header); unsigned long data_size = get_datasize(mc_header); struct extended_sigtable *ext_header; unsigned int fam_ucode, model_ucode; struct extended_signature *ext_sig; unsigned int fam, model; int ext_sigcount, i; fam = x86_family(sig); model = x86_model(sig); fam_ucode = x86_family(mc_header->sig); model_ucode = x86_model(mc_header->sig); if (fam == fam_ucode && model == model_ucode) return true; /* Look for ext. headers: */ if (total_size <= data_size + MC_HEADER_SIZE) return false; ext_header = (void *) mc_header + data_size + MC_HEADER_SIZE; ext_sig = (void *)ext_header + EXT_HEADER_SIZE; ext_sigcount = ext_header->count; for (i = 0; i < ext_sigcount; i++) { fam_ucode = x86_family(ext_sig->sig); model_ucode = x86_model(ext_sig->sig); if (fam == fam_ucode && model == model_ucode) return true; ext_sig++; } return false; } static struct ucode_patch *memdup_patch(void *data, unsigned int size) { struct ucode_patch *p; p = kzalloc(sizeof(struct ucode_patch), GFP_KERNEL); if (!p) return NULL; p->data = kmemdup(data, size, GFP_KERNEL); if (!p->data) { kfree(p); return NULL; } return p; } static void save_microcode_patch(void *data, unsigned int size) { struct microcode_header_intel *mc_hdr, *mc_saved_hdr; struct ucode_patch *iter, *tmp, *p = NULL; bool prev_found = false; unsigned int sig, pf; mc_hdr = (struct microcode_header_intel *)data; list_for_each_entry_safe(iter, tmp, µcode_cache, plist) { mc_saved_hdr = (struct microcode_header_intel *)iter->data; sig = mc_saved_hdr->sig; pf = mc_saved_hdr->pf; if (find_matching_signature(data, sig, pf)) { prev_found = true; if (mc_hdr->rev <= mc_saved_hdr->rev) continue; p = memdup_patch(data, size); if (!p) pr_err("Error allocating buffer %p\n", data); else { list_replace(&iter->plist, &p->plist); kfree(iter->data); kfree(iter); } } } /* * There weren't any previous patches found in the list cache; save the * newly found. */ if (!prev_found) { p = memdup_patch(data, size); if (!p) pr_err("Error allocating buffer for %p\n", data); else list_add_tail(&p->plist, µcode_cache); } if (!p) return; /* * Save for early loading. On 32-bit, that needs to be a physical * address as the APs are running from physical addresses, before * paging has been enabled. */ if (IS_ENABLED(CONFIG_X86_32)) intel_ucode_patch = (struct microcode_intel *)__pa_nodebug(p->data); else intel_ucode_patch = p->data; } static int microcode_sanity_check(void *mc, int print_err) { unsigned long total_size, data_size, ext_table_size; struct microcode_header_intel *mc_header = mc; struct extended_sigtable *ext_header = NULL; u32 sum, orig_sum, ext_sigcount = 0, i; struct extended_signature *ext_sig; total_size = get_totalsize(mc_header); data_size = get_datasize(mc_header); if (data_size + MC_HEADER_SIZE > total_size) { if (print_err) pr_err("Error: bad microcode data file size.\n"); return -EINVAL; } if (mc_header->ldrver != 1 || mc_header->hdrver != 1) { if (print_err) pr_err("Error: invalid/unknown microcode update format.\n"); return -EINVAL; } ext_table_size = total_size - (MC_HEADER_SIZE + data_size); if (ext_table_size) { u32 ext_table_sum = 0; u32 *ext_tablep; if ((ext_table_size < EXT_HEADER_SIZE) || ((ext_table_size - EXT_HEADER_SIZE) % EXT_SIGNATURE_SIZE)) { if (print_err) pr_err("Error: truncated extended signature table.\n"); return -EINVAL; } ext_header = mc + MC_HEADER_SIZE + data_size; if (ext_table_size != exttable_size(ext_header)) { if (print_err) pr_err("Error: extended signature table size mismatch.\n"); return -EFAULT; } ext_sigcount = ext_header->count; /* * Check extended table checksum: the sum of all dwords that * comprise a valid table must be 0. */ ext_tablep = (u32 *)ext_header; i = ext_table_size / sizeof(u32); while (i--) ext_table_sum += ext_tablep[i]; if (ext_table_sum) { if (print_err) pr_warn("Bad extended signature table checksum, aborting.\n"); return -EINVAL; } } /* * Calculate the checksum of update data and header. The checksum of * valid update data and header including the extended signature table * must be 0. */ orig_sum = 0; i = (MC_HEADER_SIZE + data_size) / sizeof(u32); while (i--) orig_sum += ((u32 *)mc)[i]; if (orig_sum) { if (print_err) pr_err("Bad microcode data checksum, aborting.\n"); return -EINVAL; } if (!ext_table_size) return 0; /* * Check extended signature checksum: 0 => valid. */ for (i = 0; i < ext_sigcount; i++) { ext_sig = (void *)ext_header + EXT_HEADER_SIZE + EXT_SIGNATURE_SIZE * i; sum = (mc_header->sig + mc_header->pf + mc_header->cksum) - (ext_sig->sig + ext_sig->pf + ext_sig->cksum); if (sum) { if (print_err) pr_err("Bad extended signature checksum, aborting.\n"); return -EINVAL; } } return 0; } /* * Get microcode matching with BSP's model. Only CPUs with the same model as * BSP can stay in the platform. */ static struct microcode_intel * scan_microcode(void *data, size_t size, struct ucode_cpu_info *uci, bool save) { struct microcode_header_intel *mc_header; struct microcode_intel *patch = NULL; unsigned int mc_size; while (size) { if (size < sizeof(struct microcode_header_intel)) break; mc_header = (struct microcode_header_intel *)data; mc_size = get_totalsize(mc_header); if (!mc_size || mc_size > size || microcode_sanity_check(data, 0) < 0) break; size -= mc_size; if (!microcode_matches(mc_header, uci->cpu_sig.sig)) { data += mc_size; continue; } if (save) { save_microcode_patch(data, mc_size); goto next; } if (!patch) { if (!has_newer_microcode(data, uci->cpu_sig.sig, uci->cpu_sig.pf, uci->cpu_sig.rev)) goto next; } else { struct microcode_header_intel *phdr = &patch->hdr; if (!has_newer_microcode(data, phdr->sig, phdr->pf, phdr->rev)) goto next; } /* We have a newer patch, save it. */ patch = data; next: data += mc_size; } if (size) return NULL; return patch; } static int collect_cpu_info_early(struct ucode_cpu_info *uci) { unsigned int val[2]; unsigned int family, model; struct cpu_signature csig = { 0 }; unsigned int eax, ebx, ecx, edx; memset(uci, 0, sizeof(*uci)); eax = 0x00000001; ecx = 0; native_cpuid(&eax, &ebx, &ecx, &edx); csig.sig = eax; family = x86_family(eax); model = x86_model(eax); if ((model >= 5) || (family > 6)) { /* get processor flags from MSR 0x17 */ native_rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]); csig.pf = 1 << ((val[1] >> 18) & 7); } csig.rev = intel_get_microcode_revision(); uci->cpu_sig = csig; uci->valid = 1; return 0; } static void show_saved_mc(void) { #ifdef DEBUG int i = 0, j; unsigned int sig, pf, rev, total_size, data_size, date; struct ucode_cpu_info uci; struct ucode_patch *p; if (list_empty(µcode_cache)) { pr_debug("no microcode data saved.\n"); return; } collect_cpu_info_early(&uci); sig = uci.cpu_sig.sig; pf = uci.cpu_sig.pf; rev = uci.cpu_sig.rev; pr_debug("CPU: sig=0x%x, pf=0x%x, rev=0x%x\n", sig, pf, rev); list_for_each_entry(p, µcode_cache, plist) { struct microcode_header_intel *mc_saved_header; struct extended_sigtable *ext_header; struct extended_signature *ext_sig; int ext_sigcount; mc_saved_header = (struct microcode_header_intel *)p->data; sig = mc_saved_header->sig; pf = mc_saved_header->pf; rev = mc_saved_header->rev; date = mc_saved_header->date; total_size = get_totalsize(mc_saved_header); data_size = get_datasize(mc_saved_header); pr_debug("mc_saved[%d]: sig=0x%x, pf=0x%x, rev=0x%x, total size=0x%x, date = %04x-%02x-%02x\n", i++, sig, pf, rev, total_size, date & 0xffff, date >> 24, (date >> 16) & 0xff); /* Look for ext. headers: */ if (total_size <= data_size + MC_HEADER_SIZE) continue; ext_header = (void *)mc_saved_header + data_size + MC_HEADER_SIZE; ext_sigcount = ext_header->count; ext_sig = (void *)ext_header + EXT_HEADER_SIZE; for (j = 0; j < ext_sigcount; j++) { sig = ext_sig->sig; pf = ext_sig->pf; pr_debug("\tExtended[%d]: sig=0x%x, pf=0x%x\n", j, sig, pf); ext_sig++; } } #endif } /* * Save this microcode patch. It will be loaded early when a CPU is * hot-added or resumes. */ static void save_mc_for_early(u8 *mc, unsigned int size) { /* Synchronization during CPU hotplug. */ static DEFINE_MUTEX(x86_cpu_microcode_mutex); mutex_lock(&x86_cpu_microcode_mutex); save_microcode_patch(mc, size); show_saved_mc(); mutex_unlock(&x86_cpu_microcode_mutex); } static bool load_builtin_intel_microcode(struct cpio_data *cp) {