From: Will Deacon <will@kernel.org>
To: mark.rutland@arm.com
Cc: Will Deacon <will@kernel.org>, linux-arm-kernel@lists.infradead.org
Subject: [BOOTWRAPPER PATCH] Enable TME for lower exception levels
Date: Fri, 23 Aug 2019 15:50:15 +0100 [thread overview]
Message-ID: <20190823145015.15974-1-will@kernel.org> (raw)
By default, TME is not available to exception levels below EL3, so
enable it in SCR_EL3 if we detect that it is implemented.
Signed-off-by: Will Deacon <will@kernel.org>
---
arch/aarch64/boot.S | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/arch/aarch64/boot.S b/arch/aarch64/boot.S
index 74705cded338..c2fe92c90297 100644
--- a/arch/aarch64/boot.S
+++ b/arch/aarch64/boot.S
@@ -48,6 +48,13 @@ _start:
orr x0, x0, #(1 << 16) // AP key enable
orr x0, x0, #(1 << 17) // AP insn enable
1:
+ /* Enable TME if present */
+ mrs x1, id_aa64isar0_el1
+ ubfx x1, x1, #24, #4
+ cbz x1, 1f
+
+ orr x0, x0, #(1 << 34) // TME enable
+1:
#ifndef KERNEL_32
orr x0, x0, #(1 << 10) // 64-bit EL2
#endif
--
2.11.0
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next reply other threads:[~2019-08-23 14:50 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-23 14:50 Will Deacon [this message]
2019-08-27 11:08 ` [BOOTWRAPPER PATCH] Enable TME for lower exception levels Mark Rutland
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