mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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37 lines
857 B
C
37 lines
857 B
C
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// SPDX-License-Identifier: GPL-2.0
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#include <linux/kernel.h>
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#include <linux/smp.h>
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static __maybe_unused void cpu_v7_check_auxcr_set(bool *warned,
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u32 mask, const char *msg)
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{
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u32 aux_cr;
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asm("mrc p15, 0, %0, c1, c0, 1" : "=r" (aux_cr));
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if ((aux_cr & mask) != mask) {
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if (!*warned)
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pr_err("CPU%u: %s", smp_processor_id(), msg);
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*warned = true;
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}
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}
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static DEFINE_PER_CPU(bool, spectre_warned);
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static void check_spectre_auxcr(bool *warned, u32 bit)
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{
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if (IS_ENABLED(CONFIG_HARDEN_BRANCH_PREDICTOR) &&
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cpu_v7_check_auxcr_set(warned, bit,
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"Spectre v2: firmware did not set auxiliary control register IBE bit, system vulnerable\n");
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}
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void cpu_v7_ca8_ibe(void)
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{
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check_spectre_auxcr(this_cpu_ptr(&spectre_warned), BIT(6));
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}
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void cpu_v7_ca15_ibe(void)
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{
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check_spectre_auxcr(this_cpu_ptr(&spectre_warned), BIT(0));
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}
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