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

source code of linux/arch/alpha/kernel/bugs.c