blob: e8c51089325fe9e2b7cc8dd5309144024372adaf [file] [log] [blame]
Michael Cree6fd16ce2018-02-26 22:02:12 +13001
2#include <asm/hwrpb.h>
3#include <linux/device.h>
Al Viro6e8d0232024-01-25 09:22:01 -05004#include <linux/cpu.h>
Michael Cree6fd16ce2018-02-26 22:02:12 +13005
6
7#ifdef CONFIG_SYSFS
8
9static 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
20ssize_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
29ssize_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
38ssize_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