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 1920d43744SThomas Gleixner * 2020d43744SThomas Gleixner * X86_MATCH_VENDOR_FAM_MODEL_FEATURE(INTEL, 6, INTEL_FAM6_BROADWELL, 2120d43744SThomas Gleixner * X86_FEATURE_ANY, NULL); 22644e9cbbSAndi Kleen * 23644e9cbbSAndi Kleen * Fields can be wildcarded with %X86_VENDOR_ANY, %X86_FAMILY_ANY, 2420d43744SThomas Gleixner * %X86_MODEL_ANY, %X86_FEATURE_ANY (except for vendor) 2520d43744SThomas Gleixner * 2620d43744SThomas Gleixner * asm/cpu_device_id.h contains a set of useful macros which are shortcuts 2720d43744SThomas Gleixner * for various common selections. The above can be shortened to: 2820d43744SThomas Gleixner * 2920d43744SThomas Gleixner * X86_MATCH_INTEL_FAM6_MODEL(BROADWELL, NULL); 30644e9cbbSAndi Kleen * 31644e9cbbSAndi Kleen * Arrays used to match for this should also be declared using 32a7e0e4e9SJosh Triplett * MODULE_DEVICE_TABLE(x86cpu, ...) 33644e9cbbSAndi Kleen * 34644e9cbbSAndi Kleen * This always matches against the boot cpu, assuming models and features are 35644e9cbbSAndi Kleen * consistent over all CPUs. 36644e9cbbSAndi Kleen */ 37644e9cbbSAndi Kleen const struct x86_cpu_id *x86_match_cpu(const struct x86_cpu_id *match) 38644e9cbbSAndi Kleen { 39644e9cbbSAndi Kleen const struct x86_cpu_id *m; 40644e9cbbSAndi Kleen struct cpuinfo_x86 *c = &boot_cpu_data; 41644e9cbbSAndi Kleen 42*e9d71445SMark Gross for (m = match; 43*e9d71445SMark Gross m->vendor | m->family | m->model | m->steppings | m->feature; 44*e9d71445SMark Gross m++) { 45644e9cbbSAndi Kleen if (m->vendor != X86_VENDOR_ANY && c->x86_vendor != m->vendor) 46644e9cbbSAndi Kleen continue; 47644e9cbbSAndi Kleen if (m->family != X86_FAMILY_ANY && c->x86 != m->family) 48644e9cbbSAndi Kleen continue; 49644e9cbbSAndi Kleen if (m->model != X86_MODEL_ANY && c->x86_model != m->model) 50644e9cbbSAndi Kleen continue; 51*e9d71445SMark Gross if (m->steppings != X86_STEPPING_ANY && 52*e9d71445SMark Gross !(BIT(c->x86_stepping) & m->steppings)) 53*e9d71445SMark Gross continue; 54644e9cbbSAndi Kleen if (m->feature != X86_FEATURE_ANY && !cpu_has(c, m->feature)) 55644e9cbbSAndi Kleen continue; 56644e9cbbSAndi Kleen return m; 57644e9cbbSAndi Kleen } 58644e9cbbSAndi Kleen return NULL; 59644e9cbbSAndi Kleen } 60644e9cbbSAndi Kleen EXPORT_SYMBOL(x86_match_cpu); 610f42b790SKan Liang 620f42b790SKan Liang static const struct x86_cpu_desc * 630f42b790SKan Liang x86_match_cpu_with_stepping(const struct x86_cpu_desc *match) 640f42b790SKan Liang { 650f42b790SKan Liang struct cpuinfo_x86 *c = &boot_cpu_data; 660f42b790SKan Liang const struct x86_cpu_desc *m; 670f42b790SKan Liang 680f42b790SKan Liang for (m = match; m->x86_family | m->x86_model; m++) { 690f42b790SKan Liang if (c->x86_vendor != m->x86_vendor) 700f42b790SKan Liang continue; 710f42b790SKan Liang if (c->x86 != m->x86_family) 720f42b790SKan Liang continue; 730f42b790SKan Liang if (c->x86_model != m->x86_model) 740f42b790SKan Liang continue; 750f42b790SKan Liang if (c->x86_stepping != m->x86_stepping) 760f42b790SKan Liang continue; 770f42b790SKan Liang return m; 780f42b790SKan Liang } 790f42b790SKan Liang return NULL; 800f42b790SKan Liang } 810f42b790SKan Liang 820f42b790SKan Liang bool x86_cpu_has_min_microcode_rev(const struct x86_cpu_desc *table) 830f42b790SKan Liang { 840f42b790SKan Liang const struct x86_cpu_desc *res = x86_match_cpu_with_stepping(table); 850f42b790SKan Liang 860f42b790SKan Liang if (!res || res->x86_microcode_rev > boot_cpu_data.microcode) 870f42b790SKan Liang return false; 880f42b790SKan Liang 890f42b790SKan Liang return true; 900f42b790SKan Liang } 910f42b790SKan Liang EXPORT_SYMBOL_GPL(x86_cpu_has_min_microcode_rev); 92