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-rw-r--r--arch/arm64/mm/proc-macros.S10
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/arm64/mm/proc-macros.S b/arch/arm64/mm/proc-macros.S
index 005d29e2977d..4c4d93c4bf65 100644
--- a/arch/arm64/mm/proc-macros.S
+++ b/arch/arm64/mm/proc-macros.S
@@ -52,3 +52,13 @@
mov \reg, #4 // bytes per word
lsl \reg, \reg, \tmp // actual cache line size
.endm
+
+/*
+ * tcr_set_idmap_t0sz - update TCR.T0SZ so that we can load the ID map
+ */
+ .macro tcr_set_idmap_t0sz, valreg, tmpreg
+#ifndef CONFIG_ARM64_VA_BITS_48
+ ldr_l \tmpreg, idmap_t0sz
+ bfi \valreg, \tmpreg, #TCR_T0SZ_OFFSET, #TCR_TxSZ_WIDTH
+#endif
+ .endm