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Diffstat (limited to 'arch/arm64/mm/proc.S')
-rw-r--r--arch/arm64/mm/proc.S22
1 files changed, 14 insertions, 8 deletions
diff --git a/arch/arm64/mm/proc.S b/arch/arm64/mm/proc.S
index c0af47617299..5f9a73a4452c 100644
--- a/arch/arm64/mm/proc.S
+++ b/arch/arm64/mm/proc.S
@@ -36,6 +36,12 @@
#define TCR_TG_FLAGS TCR_TG0_4K | TCR_TG1_4K
#endif
+#ifdef CONFIG_RANDOMIZE_BASE
+#define TCR_KASLR_FLAGS TCR_NFD1
+#else
+#define TCR_KASLR_FLAGS 0
+#endif
+
#define TCR_SMP_FLAGS TCR_SHARED
/* PTWs cacheable, inner/outer WBWA */
@@ -432,7 +438,8 @@ ENTRY(__cpu_setup)
* both user and kernel.
*/
ldr x10, =TCR_TxSZ(VA_BITS) | TCR_CACHE_FLAGS | TCR_SMP_FLAGS | \
- TCR_TG_FLAGS | TCR_ASID16 | TCR_TBI0 | TCR_A1
+ TCR_TG_FLAGS | TCR_KASLR_FLAGS | TCR_ASID16 | \
+ TCR_TBI0 | TCR_A1
tcr_set_idmap_t0sz x10, x9
/*
@@ -441,16 +448,15 @@ ENTRY(__cpu_setup)
tcr_compute_pa_size x10, #TCR_IPS_SHIFT, x5, x6
#ifdef CONFIG_ARM64_HW_AFDBM
/*
- * Hardware update of the Access and Dirty bits.
+ * Enable hardware update of the Access Flags bit.
+ * Hardware dirty bit management is enabled later,
+ * via capabilities.
*/
mrs x9, ID_AA64MMFR1_EL1
and x9, x9, #0xf
- cbz x9, 2f
- cmp x9, #2
- b.lt 1f
- orr x10, x10, #TCR_HD // hardware Dirty flag update
-1: orr x10, x10, #TCR_HA // hardware Access flag update
-2:
+ cbz x9, 1f
+ orr x10, x10, #TCR_HA // hardware Access flag update
+1:
#endif /* CONFIG_ARM64_HW_AFDBM */
msr tcr_el1, x10
ret // return to head.S