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ArmPkg/ArmMmuLib: Add support for EL2&0 translation regime

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With VHE enabled, EL2 uses the EL2&0 translation regime, which is
compatible with the EL1&0 translation regime when it comes to the TCR
configuration register and the page table descriptor.

Given that some CPUs may have VHE force enabled when executing at EL2,
the MMU code needs to be able to deal with this even if it doesn't
enable VHE itself.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Ard Biesheuvel 2024-11-12 16:21:49 +01:00 committed by mergify[bot]
parent e80b17d21a
commit f60a839480
1 changed files with 22 additions and 7 deletions
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29
ArmPkg/Library/ArmMmuLib/AArch64/ArmMmuLibCore.c
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@ -24,6 +24,23 @@
STATIC ARM_REPLACE_LIVE_TRANSLATION_ENTRY mReplaceLiveEntryFunc = ArmReplaceLiveTranslationEntry;
/**
Whether the current translation regime is either EL1&0 or EL2&0, and
therefore supports non-global, ASID-scoped memory mappings.
**/
STATIC
BOOLEAN
TranslationRegimeIsDual (
VOID
)
{
if (ArmReadCurrentEL () == AARCH64_EL2) {
return (ArmReadHcr () & ARM_HCR_E2H) != 0;
}
return TRUE;
}
STATIC
UINT64
ArmMemoryAttributeToPageAttribute (
@ -39,7 +56,7 @@ ArmMemoryAttributeToPageAttribute (
case ARM_MEMORY_REGION_ATTRIBUTE_WRITE_BACK_XP:
case ARM_MEMORY_REGION_ATTRIBUTE_DEVICE:
if (ArmReadCurrentEL () == AARCH64_EL2) {
if (!TranslationRegimeIsDual ()) {
Permissions = TT_XN_MASK;
} else {
Permissions = TT_UXN_MASK | TT_PXN_MASK;
@ -53,7 +70,7 @@ ArmMemoryAttributeToPageAttribute (
switch (Attributes) {
case ARM_MEMORY_REGION_ATTRIBUTE_WRITE_BACK_NONSHAREABLE:
return TT_ATTR_INDX_MEMORY_WRITE_BACK;
return TT_ATTR_INDX_MEMORY_WRITE_BACK | Permissions;
case ARM_MEMORY_REGION_ATTRIBUTE_WRITE_BACK:
case ARM_MEMORY_REGION_ATTRIBUTE_WRITE_BACK_RO:
@ -65,7 +82,7 @@ ArmMemoryAttributeToPageAttribute (
// Uncached and device mappings are treated as outer shareable by default,
case ARM_MEMORY_REGION_ATTRIBUTE_UNCACHED_UNBUFFERED:
return TT_ATTR_INDX_MEMORY_NON_CACHEABLE;
return TT_ATTR_INDX_MEMORY_NON_CACHEABLE | Permissions;
default:
ASSERT (0);
@ -451,7 +468,7 @@ GcdAttributeToPageAttribute (
if (((GcdAttributes & EFI_MEMORY_XP) != 0) ||
((GcdAttributes & EFI_MEMORY_CACHETYPE_MASK) == EFI_MEMORY_UC))
{
if (ArmReadCurrentEL () == AARCH64_EL2) {
if (!TranslationRegimeIsDual ()) {
PageAttributes |= TT_XN_MASK;
} else {
PageAttributes |= TT_UXN_MASK | TT_PXN_MASK;
@ -594,9 +611,7 @@ ArmConfigureMmu (
//
// Set TCR that allows us to retrieve T0SZ in the subsequent functions
//
// Ideally we will be running at EL2, but should support EL1 as well.
// UEFI should not run at EL3.
if (ArmReadCurrentEL () == AARCH64_EL2) {
if (!TranslationRegimeIsDual ()) {
// Note: Bits 23 and 31 are reserved(RES1) bits in TCR_EL2
TCR = T0SZ | (1UL << 31) | (1UL << 23) | TCR_TG0_4KB;