QortalOS Brooklyn for Raspberry Pi 4
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// SPDX-License-Identifier: GPL-2.0
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#include <linux/device.h>
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#include <linux/cpu.h>
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#include <asm/facility.h>
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#include <asm/nospec-branch.h>
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ssize_t cpu_show_spectre_v1(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "Mitigation: __user pointer sanitization\n");
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}
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ssize_t cpu_show_spectre_v2(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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if (test_facility(156))
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return sprintf(buf, "Mitigation: etokens\n");
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if (nospec_uses_trampoline())
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return sprintf(buf, "Mitigation: execute trampolines\n");
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if (__test_facility(82, alt_stfle_fac_list))
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return sprintf(buf, "Mitigation: limited branch prediction\n");
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return sprintf(buf, "Vulnerable\n");
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}
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