1 
2 #include <asm/hwrpb.h>
3 #include <linux/device.h>
4 
5 
6 #ifdef CONFIG_SYSFS
7 
cpu_is_ev6_or_later(void)8 static 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 
cpu_show_meltdown(struct device * dev,struct device_attribute * attr,char * buf)19 ssize_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 
cpu_show_spectre_v1(struct device * dev,struct device_attribute * attr,char * buf)28 ssize_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 
cpu_show_spectre_v2(struct device * dev,struct device_attribute * attr,char * buf)37 ssize_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