1 #include <asm/cpu_device_id.h> 2 #include <asm/cpufeature.h> 3 #include <linux/cpu.h> 4 #include <linux/export.h> 5 #include <linux/slab.h> 6 7 /** 8 * x86_match_cpu - match current CPU again an array of x86_cpu_ids 9 * @match: Pointer to array of x86_cpu_ids. Last entry terminated with 10 * {}. 11 * 12 * Return the entry if the current CPU matches the entries in the 13 * passed x86_cpu_id match table. Otherwise NULL. The match table 14 * contains vendor (X86_VENDOR_*), family, model and feature bits or 15 * respective wildcard entries. 16 * 17 * A typical table entry would be to match a specific CPU 18 * { X86_VENDOR_INTEL, 6, 0x12 } 19 * or to match a specific CPU feature 20 * { X86_FEATURE_MATCH(X86_FEATURE_FOOBAR) } 21 * 22 * Fields can be wildcarded with %X86_VENDOR_ANY, %X86_FAMILY_ANY, 23 * %X86_MODEL_ANY, %X86_FEATURE_ANY or 0 (except for vendor) 24 * 25 * Arrays used to match for this should also be declared using 26 * MODULE_DEVICE_TABLE(x86cpu, ...) 27 * 28 * This always matches against the boot cpu, assuming models and features are 29 * consistent over all CPUs. 30 */ 31 const struct x86_cpu_id *x86_match_cpu(const struct x86_cpu_id *match) 32 { 33 const struct x86_cpu_id *m; 34 struct cpuinfo_x86 *c = &boot_cpu_data; 35 36 for (m = match; m->vendor | m->family | m->model | m->feature; m++) { 37 if (m->vendor != X86_VENDOR_ANY && c->x86_vendor != m->vendor) 38 continue; 39 if (m->family != X86_FAMILY_ANY && c->x86 != m->family) 40 continue; 41 if (m->model != X86_MODEL_ANY && c->x86_model != m->model) 42 continue; 43 if (m->feature != X86_FEATURE_ANY && !cpu_has(c, m->feature)) 44 continue; 45 return m; 46 } 47 return NULL; 48 } 49 EXPORT_SYMBOL(x86_match_cpu); 50