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