1 #include <asm/cpu_device_id.h> 2 #include <asm/processor.h> 3 #include <linux/cpu.h> 4 #include <linux/module.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(x86_cpu, ...) 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 51 ssize_t arch_print_cpu_modalias(struct device *dev, 52 struct device_attribute *attr, 53 char *bufptr) 54 { 55 int size = PAGE_SIZE; 56 int i, n; 57 char *buf = bufptr; 58 59 n = snprintf(buf, size, "x86cpu:vendor:%04X:family:%04X:" 60 "model:%04X:feature:", 61 boot_cpu_data.x86_vendor, 62 boot_cpu_data.x86, 63 boot_cpu_data.x86_model); 64 size -= n; 65 buf += n; 66 size -= 1; 67 for (i = 0; i < NCAPINTS*32; i++) { 68 if (boot_cpu_has(i)) { 69 n = snprintf(buf, size, ",%04X", i); 70 if (n >= size) { 71 WARN(1, "x86 features overflow page\n"); 72 break; 73 } 74 size -= n; 75 buf += n; 76 } 77 } 78 *buf++ = '\n'; 79 return buf - bufptr; 80 } 81 82 int arch_cpu_uevent(struct device *dev, struct kobj_uevent_env *env) 83 { 84 char *buf = kzalloc(PAGE_SIZE, GFP_KERNEL); 85 if (buf) { 86 arch_print_cpu_modalias(NULL, NULL, buf); 87 add_uevent_var(env, "MODALIAS=%s", buf); 88 kfree(buf); 89 } 90 return 0; 91 } 92