1
2 #include <asm/hwrpb.h>
3 #include <linux/device.h>
4 #include <linux/cpu.h>
5
6
7 #ifdef CONFIG_SYSFS
8
9 static int cpu_is_ev6_or_later(void)
10 {
11 struct percpu_struct *cpu;
12 unsigned long cputype;
13
14 cpu = (struct percpu_struct *)((char *)hwrpb + hwrpb->processor_offset);
15 cputype = cpu->type & 0xffffffff;
16 /* Include all of EV6, EV67, EV68, EV7, EV79 and EV69. */
17 return (cputype == EV6_CPU) || ((cputype >= EV67_CPU) && (cputype <= EV69_CPU));
18 }
19
20 ssize_t cpu_show_meltdown(struct device *dev,
21 struct device_attribute *attr, char *buf)
22 {
23 if (cpu_is_ev6_or_later())
24 return sprintf(buf, "Vulnerable\n");
25 else
26 return sprintf(buf, "Not affected\n");
27 }
28
29 ssize_t cpu_show_spectre_v1(struct device *dev,
30 struct device_attribute *attr, char *buf)
31 {
32 if (cpu_is_ev6_or_later())
33 return sprintf(buf, "Vulnerable\n");
34 else
35 return sprintf(buf, "Not affected\n");
36 }
37
38 ssize_t cpu_show_spectre_v2(struct device *dev,
39 struct device_attribute *attr, char *buf)
40 {
41 if (cpu_is_ev6_or_later())
42 return sprintf(buf, "Vulnerable\n");
43 else
44 return sprintf(buf, "Not affected\n");
45 }
46 #endif
47
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