From: Pierre-Clément Tosi <ptosi@google.com>
Date: Wed, 8 Feb 2023 20:54:28 +0000 (+0800)
Subject: arm64: Initialize TLB memory if CMO_BY_VA_ONLY
X-Git-Url: http://git.dujemihanovic.xyz/?a=commitdiff_plain;h=c55c2a8565ad6b8aad2e47008a53bbca398c0f62;p=u-boot.git

arm64: Initialize TLB memory if CMO_BY_VA_ONLY

Memory used to hold the page tables is allocated from the top of RAM
with no prior initialization and could therefore hold invalid data. As
invalidate_dcache_all() will be called before the MMU has been
initialized and as that function relies indirectly on the page tables
when using CMO_BY_VA_ONLY, these must be in a valid state from their
allocation.

Signed-off-by: Pierre-Clément Tosi <ptosi@google.com>
[ Paul: pick from the Android tree. Fix checkpatch warnings, and rebased
  to the upstream. ]
Signed-off-by: Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>
Cc: Tom Rini <trini@konsulko.com>
Link: https://android.googlesource.com/platform/external/u-boot/+/e3ceef4230b772186c6853cace4a676a407e6ab7
---

diff --git a/arch/arm/lib/cache.c b/arch/arm/lib/cache.c
index 1a589c7e2a..7a16015867 100644
--- a/arch/arm/lib/cache.c
+++ b/arch/arm/lib/cache.c
@@ -159,6 +159,15 @@ __weak int arm_reserve_mmu(void)
 	 */
 	gd->arch.tlb_allocated = gd->arch.tlb_addr;
 #endif
+
+	if (IS_ENABLED(CONFIG_CMO_BY_VA_ONLY)) {
+		/*
+		 * As invalidate_dcache_all() will be called before
+		 * mmu_setup(), we should make sure that the PTs are
+		 * already in a valid state.
+		 */
+		memset((void *)gd->arch.tlb_addr, 0, gd->arch.tlb_size);
+	}
 #endif
 
 	return 0;