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arm64: Tell userspace when BTI is supported

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To allow userspace to decide when to try enabling BTI report if it's
available via the ID register and hwcaps.

Sponsored by:	Arm Ltd
This commit is contained in:
Andrew Turner 2023-10-26 10:50:28 +01:00
parent 670af174e2
commit e68136d363
1 changed files with 2 additions and 4 deletions
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6
sys/arm64/arm64/identcpu.c
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@ -1530,13 +1530,10 @@ static const struct mrs_field_value id_aa64pfr1_bt[] = {
MRS_FIELD_VALUE_END,
};
#if 0
/* Enable when we add BTI support */
static const struct mrs_field_hwcap id_aa64pfr1_bt_caps[] = {
MRS_HWCAP(2, HWCAP2_BTI, ID_AA64PFR1_BT_IMPL),
MRS_HWCAP_END
};
#endif
static const struct mrs_field id_aa64pfr1_fields[] = {
MRS_FIELD(ID_AA64PFR1, NMI, false, MRS_EXACT, id_aa64pfr1_nmi),
@ -1552,7 +1549,8 @@ static const struct mrs_field id_aa64pfr1_fields[] = {
MRS_FIELD(ID_AA64PFR1, MTE, false, MRS_EXACT, id_aa64pfr1_mte),
MRS_FIELD_HWCAP(ID_AA64PFR1, SSBS, false, MRS_LOWER, id_aa64pfr1_ssbs,
id_aa64pfr1_ssbs_caps),
MRS_FIELD(ID_AA64PFR1, BT, false, MRS_EXACT, id_aa64pfr1_bt),
MRS_FIELD_HWCAP_SPLIT(ID_AA64PFR1, BT, false, MRS_LOWER, MRS_EXACT,
id_aa64pfr1_bt, id_aa64pfr1_bt_caps),
MRS_FIELD_END,
};