From: Ard Biesheuvel <ardb@kernel.org>
To: linux-efi@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org,
Ard Biesheuvel <ardb@kernel.org>,
Russell King <linux@armlinux.org.uk>,
Marc Zyngier <maz@kernel.org>, Nicolas Pitre <nico@fluxnic.net>,
Catalin Marinas <catalin.marinas@arm.com>,
Tony Lindgren <tony@atomide.com>,
Linus Walleij <linus.walleij@linaro.org>
Subject: [PATCH v3 2/5] efi/arm: Pass start and end addresses to cache_clean_flush()
Date: Mon, 24 Feb 2020 13:17:30 +0100 [thread overview]
Message-ID: <20200224121733.2202-3-ardb@kernel.org> (raw)
In-Reply-To: <20200224121733.2202-1-ardb@kernel.org>
In preparation for turning the decompressor's cache clean/flush
operations into proper by-VA maintenance for v7 cores, pass the
start and end addresses of the regions that need cache maintenance
into cache_clean_flush in registers r0 and r1.
Currently, all implementations of cache_clean_flush ignore these
values, so no functional change is expected as a result of this
patch.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
arch/arm/boot/compressed/head.S | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S
index 39f7071d47c7..8487221bedb0 100644
--- a/arch/arm/boot/compressed/head.S
+++ b/arch/arm/boot/compressed/head.S
@@ -1460,6 +1460,12 @@ ENTRY(efi_stub_entry)
@ Preserve return value of efi_entry() in r4
mov r4, r0
+ add r1, r4, #SZ_2M @ DT end
+ bl cache_clean_flush
+
+ ldr r0, [sp] @ relocated zImage
+ ldr r1, =_edata @ size of zImage
+ add r1, r1, r0 @ end of zImage
bl cache_clean_flush
@ The PE/COFF loader might not have cleaned the code we are
--
2.17.1
next prev parent reply other threads:[~2020-02-24 12:17 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-24 12:17 [PATCH v3 0/5] ARM: decompressor: use by-VA cache maintenance for v7 cores Ard Biesheuvel
2020-02-24 12:17 ` [PATCH v3 1/5] efi/arm: Work around missing cache maintenance in decompressor handover Ard Biesheuvel
2020-02-24 12:17 ` Ard Biesheuvel [this message]
2020-02-24 12:17 ` [PATCH v3 3/5] ARM: decompressor: factor out routine to obtain the inflated image size Ard Biesheuvel
2020-02-24 12:17 ` [PATCH v3 4/5] ARM: decompressor: prepare cache_clean_flush for doing by-VA maintenance Ard Biesheuvel
2020-02-24 12:17 ` [PATCH v3 5/5] ARM: decompressor: switch to by-VA cache maintenance for v7 cores Ard Biesheuvel
2020-02-25 15:48 ` [PATCH v3 0/5] ARM: decompressor: use " Linus Walleij
2020-02-25 17:18 ` Ard Biesheuvel
2020-02-25 17:30 ` Ard Biesheuvel
2020-02-25 21:25 ` Linus Walleij
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