diff options
| -rw-r--r-- | ArmVirtPkg/ArmVirtQemu.dsc | 5 | ||||
| -rw-r--r-- | ArmVirtPkg/Library/ArmPlatformLibQemu/AArch64/ArmPlatformHelper.S | 15 |
2 files changed, 20 insertions, 0 deletions
diff --git a/ArmVirtPkg/ArmVirtQemu.dsc b/ArmVirtPkg/ArmVirtQemu.dsc index f77443229e..5dd8b6104c 100644 --- a/ArmVirtPkg/ArmVirtQemu.dsc +++ b/ArmVirtPkg/ArmVirtQemu.dsc @@ -31,6 +31,7 @@ DEFINE SECURE_BOOT_ENABLE = FALSE
DEFINE TPM2_ENABLE = FALSE
DEFINE TPM2_CONFIG_ENABLE = FALSE
+ DEFINE CAVIUM_ERRATUM_27456 = FALSE
#
# Network definition
@@ -117,7 +118,11 @@ UefiScsiLib|MdePkg/Library/UefiScsiLib/UefiScsiLib.inf
[BuildOptions]
+!if $(CAVIUM_ERRATUM_27456) == TRUE
+ GCC:*_*_AARCH64_PP_FLAGS = -DCAVIUM_ERRATUM_27456
+!else
GCC:*_*_AARCH64_CC_XIPFLAGS ==
+!endif
!include NetworkPkg/NetworkBuildOptions.dsc.inc
diff --git a/ArmVirtPkg/Library/ArmPlatformLibQemu/AArch64/ArmPlatformHelper.S b/ArmVirtPkg/Library/ArmPlatformLibQemu/AArch64/ArmPlatformHelper.S index 1787d52fbf..5ac7c732f6 100644 --- a/ArmVirtPkg/Library/ArmPlatformLibQemu/AArch64/ArmPlatformHelper.S +++ b/ArmVirtPkg/Library/ArmPlatformLibQemu/AArch64/ArmPlatformHelper.S @@ -42,6 +42,21 @@ ASM_FUNC(ArmPlatformPeiBootAction)
+#ifdef CAVIUM_ERRATUM_27456
+ /*
+ * On Cavium ThunderX, using non-global mappings that are executable at EL1
+ * results in I-cache corruption. So just avoid the early ID mapping there.
+ *
+ * MIDR implementor 0x43
+ * MIDR part numbers 0xA1 0xA2 (but not 0xAF)
+ */
+ mrs x0, midr_el1 // read the MIDR into X0
+ ubfx x1, x0, #24, #8 // grab implementor id
+ ubfx x0, x0, #7, #9 // grab part number bits [11:3]
+ cmp x1, #0x43 // compare implementor id
+ ccmp x0, #0xA0 >> 3, #0, eq // compare part# bits [11:3]
+ b.eq 0f
+#endif
mrs x0, CurrentEL // check current exception level
tbnz x0, #3, 0f // omit early ID map if above EL1
|