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