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, "Vulnerable\n");
24	else
25		return sprintf(buf, "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, "Vulnerable\n");
33	else
34		return sprintf(buf, "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, "Vulnerable\n");
42	else
43		return sprintf(buf, "Not affected\n");
44}
45#endif
46