1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0 2644e9cbbSAndi Kleen #include <asm/cpu_device_id.h> 3cd4d09ecSBorislav Petkov #include <asm/cpufeature.h> 4644e9cbbSAndi Kleen #include <linux/cpu.h> 5186f4360SPaul Gortmaker #include <linux/export.h> 6fad12ac8SThomas Renninger #include <linux/slab.h> 7644e9cbbSAndi Kleen 8644e9cbbSAndi Kleen /** 9644e9cbbSAndi Kleen * x86_match_cpu - match current CPU again an array of x86_cpu_ids 10644e9cbbSAndi Kleen * @match: Pointer to array of x86_cpu_ids. Last entry terminated with 11644e9cbbSAndi Kleen * {}. 12644e9cbbSAndi Kleen * 13644e9cbbSAndi Kleen * Return the entry if the current CPU matches the entries in the 14644e9cbbSAndi Kleen * passed x86_cpu_id match table. Otherwise NULL. The match table 15644e9cbbSAndi Kleen * contains vendor (X86_VENDOR_*), family, model and feature bits or 16644e9cbbSAndi Kleen * respective wildcard entries. 17644e9cbbSAndi Kleen * 18644e9cbbSAndi Kleen * A typical table entry would be to match a specific CPU 19644e9cbbSAndi Kleen * { X86_VENDOR_INTEL, 6, 0x12 } 20644e9cbbSAndi Kleen * or to match a specific CPU feature 21644e9cbbSAndi Kleen * { X86_FEATURE_MATCH(X86_FEATURE_FOOBAR) } 22644e9cbbSAndi Kleen * 23644e9cbbSAndi Kleen * Fields can be wildcarded with %X86_VENDOR_ANY, %X86_FAMILY_ANY, 24644e9cbbSAndi Kleen * %X86_MODEL_ANY, %X86_FEATURE_ANY or 0 (except for vendor) 25644e9cbbSAndi Kleen * 26644e9cbbSAndi Kleen * Arrays used to match for this should also be declared using 27a7e0e4e9SJosh Triplett * MODULE_DEVICE_TABLE(x86cpu, ...) 28644e9cbbSAndi Kleen * 29644e9cbbSAndi Kleen * This always matches against the boot cpu, assuming models and features are 30644e9cbbSAndi Kleen * consistent over all CPUs. 31644e9cbbSAndi Kleen */ 32644e9cbbSAndi Kleen const struct x86_cpu_id *x86_match_cpu(const struct x86_cpu_id *match) 33644e9cbbSAndi Kleen { 34644e9cbbSAndi Kleen const struct x86_cpu_id *m; 35644e9cbbSAndi Kleen struct cpuinfo_x86 *c = &boot_cpu_data; 36644e9cbbSAndi Kleen 37644e9cbbSAndi Kleen for (m = match; m->vendor | m->family | m->model | m->feature; m++) { 38644e9cbbSAndi Kleen if (m->vendor != X86_VENDOR_ANY && c->x86_vendor != m->vendor) 39644e9cbbSAndi Kleen continue; 40644e9cbbSAndi Kleen if (m->family != X86_FAMILY_ANY && c->x86 != m->family) 41644e9cbbSAndi Kleen continue; 42644e9cbbSAndi Kleen if (m->model != X86_MODEL_ANY && c->x86_model != m->model) 43644e9cbbSAndi Kleen continue; 44644e9cbbSAndi Kleen if (m->feature != X86_FEATURE_ANY && !cpu_has(c, m->feature)) 45644e9cbbSAndi Kleen continue; 46644e9cbbSAndi Kleen return m; 47644e9cbbSAndi Kleen } 48644e9cbbSAndi Kleen return NULL; 49644e9cbbSAndi Kleen } 50644e9cbbSAndi Kleen EXPORT_SYMBOL(x86_match_cpu); 51*0f42b790SKan Liang 52*0f42b790SKan Liang static const struct x86_cpu_desc * 53*0f42b790SKan Liang x86_match_cpu_with_stepping(const struct x86_cpu_desc *match) 54*0f42b790SKan Liang { 55*0f42b790SKan Liang struct cpuinfo_x86 *c = &boot_cpu_data; 56*0f42b790SKan Liang const struct x86_cpu_desc *m; 57*0f42b790SKan Liang 58*0f42b790SKan Liang for (m = match; m->x86_family | m->x86_model; m++) { 59*0f42b790SKan Liang if (c->x86_vendor != m->x86_vendor) 60*0f42b790SKan Liang continue; 61*0f42b790SKan Liang if (c->x86 != m->x86_family) 62*0f42b790SKan Liang continue; 63*0f42b790SKan Liang if (c->x86_model != m->x86_model) 64*0f42b790SKan Liang continue; 65*0f42b790SKan Liang if (c->x86_stepping != m->x86_stepping) 66*0f42b790SKan Liang continue; 67*0f42b790SKan Liang return m; 68*0f42b790SKan Liang } 69*0f42b790SKan Liang return NULL; 70*0f42b790SKan Liang } 71*0f42b790SKan Liang 72*0f42b790SKan Liang bool x86_cpu_has_min_microcode_rev(const struct x86_cpu_desc *table) 73*0f42b790SKan Liang { 74*0f42b790SKan Liang const struct x86_cpu_desc *res = x86_match_cpu_with_stepping(table); 75*0f42b790SKan Liang 76*0f42b790SKan Liang if (!res || res->x86_microcode_rev > boot_cpu_data.microcode) 77*0f42b790SKan Liang return false; 78*0f42b790SKan Liang 79*0f42b790SKan Liang return true; 80*0f42b790SKan Liang } 81*0f42b790SKan Liang EXPORT_SYMBOL_GPL(x86_cpu_has_min_microcode_rev); 82