xref: /openbmc/linux/arch/x86/kernel/cpu/match.c (revision fad12ac8)
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 -= 2;
67 	for (i = 0; i < NCAPINTS*32; i++) {
68 		if (boot_cpu_has(i)) {
69 			n = snprintf(buf, size, ",%04X", i);
70 			if (n < 0) {
71 				WARN(1, "x86 features overflow page\n");
72 				break;
73 			}
74 			size -= n;
75 			buf += n;
76 		}
77 	}
78 	*buf++ = ',';
79 	*buf++ = '\n';
80 	return buf - bufptr;
81 }
82 
83 int arch_cpu_uevent(struct device *dev, struct kobj_uevent_env *env)
84 {
85 	char *buf = kzalloc(PAGE_SIZE, GFP_KERNEL);
86 	if (buf) {
87 		arch_print_cpu_modalias(NULL, NULL, buf);
88 		add_uevent_var(env, "MODALIAS=%s", buf);
89 		kfree(buf);
90 	}
91 	return 0;
92 }
93