xref: /linux/arch/alpha/kernel/bugs.c (revision c532de5a67a70f8533d495f8f2aaa9a0491c3ad0)
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