142 lines
2.7 KiB
C
142 lines
2.7 KiB
C
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// SPDX-License-Identifier: GPL-2.0+
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#include <errno.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <string.h>
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#include "dexcr.h"
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#include "utils.h"
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static unsigned int dexcr;
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static unsigned int hdexcr;
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static unsigned int effective;
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struct dexcr_aspect {
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const char *name;
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const char *desc;
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unsigned int index;
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};
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static const struct dexcr_aspect aspects[] = {
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{
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.name = "SBHE",
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.desc = "Speculative branch hint enable",
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.index = 0,
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},
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{
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.name = "IBRTPD",
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.desc = "Indirect branch recurrent target prediction disable",
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.index = 3,
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},
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{
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.name = "SRAPD",
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.desc = "Subroutine return address prediction disable",
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.index = 4,
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},
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{
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.name = "NPHIE",
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.desc = "Non-privileged hash instruction enable",
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.index = 5,
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},
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{
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.name = "PHIE",
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.desc = "Privileged hash instruction enable",
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.index = 6,
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},
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};
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static void print_list(const char *list[], size_t len)
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{
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for (size_t i = 0; i < len; i++) {
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printf("%s", list[i]);
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if (i + 1 < len)
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printf(", ");
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}
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}
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static void print_dexcr(char *name, unsigned int bits)
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{
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const char *enabled_aspects[ARRAY_SIZE(aspects) + 1] = {NULL};
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size_t j = 0;
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printf("%s: %08x", name, bits);
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if (bits == 0) {
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printf("\n");
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return;
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}
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for (size_t i = 0; i < ARRAY_SIZE(aspects); i++) {
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unsigned int mask = DEXCR_PR_BIT(aspects[i].index);
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if (bits & mask) {
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enabled_aspects[j++] = aspects[i].name;
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bits &= ~mask;
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}
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}
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if (bits)
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enabled_aspects[j++] = "unknown";
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printf(" (");
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print_list(enabled_aspects, j);
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printf(")\n");
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}
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static void print_aspect(const struct dexcr_aspect *aspect)
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{
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const char *attributes[8] = {NULL};
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size_t j = 0;
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unsigned long mask;
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mask = DEXCR_PR_BIT(aspect->index);
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if (dexcr & mask)
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attributes[j++] = "set";
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if (hdexcr & mask)
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attributes[j++] = "set (hypervisor)";
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if (!(effective & mask))
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attributes[j++] = "clear";
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printf("%12s %c (%d): ", aspect->name, effective & mask ? '*' : ' ', aspect->index);
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print_list(attributes, j);
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printf(" \t(%s)\n", aspect->desc);
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}
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int main(int argc, char *argv[])
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{
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if (!dexcr_exists()) {
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printf("DEXCR not detected on this hardware\n");
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return 1;
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}
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dexcr = get_dexcr(DEXCR);
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hdexcr = get_dexcr(HDEXCR);
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effective = dexcr | hdexcr;
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print_dexcr(" DEXCR", dexcr);
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print_dexcr(" HDEXCR", hdexcr);
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print_dexcr("Effective", effective);
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printf("\n");
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for (size_t i = 0; i < ARRAY_SIZE(aspects); i++)
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print_aspect(&aspects[i]);
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printf("\n");
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if (effective & DEXCR_PR_NPHIE) {
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printf("DEXCR[NPHIE] enabled: hashst/hashchk ");
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if (hashchk_triggers())
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printf("working\n");
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else
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printf("failed to trigger\n");
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} else {
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printf("DEXCR[NPHIE] disabled: hashst/hashchk ");
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if (hashchk_triggers())
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printf("unexpectedly triggered\n");
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else
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printf("ignored\n");
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}
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return 0;
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}
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