From: Ard Biesheuvel <ardb@kernel•org>
To: linux-arm-kernel@lists•infradead.org
Cc: linux-efi@vger•kernel.org, Nicolas Pitre <nico@fluxnic•net>,
Tony Lindgren <tony@atomide•com>, Marc Zyngier <maz@kernel•org>,
Linus Walleij <linus.walleij@linaro•org>,
Russell King <linux@armlinux•org.uk>,
Catalin Marinas <catalin.marinas@arm•com>,
Ard Biesheuvel <ardb@kernel•org>
Subject: [PATCH v4 4/5] ARM: decompressor: prepare cache_clean_flush for doing by-VA maintenance
Date: Wed, 26 Feb 2020 17:57:37 +0100 [thread overview]
Message-ID: <20200226165738.11201-5-ardb@kernel.org> (raw)
In-Reply-To: <20200226165738.11201-1-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 | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S
index d45952aae2b5..f90034151aef 100644
--- a/arch/arm/boot/compressed/head.S
+++ b/arch/arm/boot/compressed/head.S
@@ -528,6 +528,8 @@ dtb_check_done:
/* Preserve offset to relocated code. */
sub r6, r9, r6
+ mov r0, r9 @ start of relocated zImage
+ add r1, sp, r6 @ end of relocated zImage
#ifndef CONFIG_ZBOOT_ROM
/* cache_clean_flush may use the stack, so relocate it */
add sp, sp, r6
@@ -629,6 +631,11 @@ not_relocated: mov r0, #0
add r2, sp, #0x10000 @ 64k max
mov r3, r7
bl decompress_kernel
+
+ get_inflated_image_size r1, r2, r3
+
+ mov r0, r4 @ start of inflated image
+ add r1, r1, r0 @ end of inflated image
bl cache_clean_flush
bl cache_off
@@ -1182,6 +1189,9 @@ __armv7_mmu_cache_off:
/*
* Clean and flush the cache to maintain consistency.
*
+ * On entry,
+ * r0 = start address
+ * r1 = end address (exclusive)
* On exit,
* r1, r2, r3, r9, r10, r11, r12 corrupted
* This routine must preserve:
--
2.17.1
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next prev parent reply other threads:[~2020-02-26 16:59 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-26 16:57 [PATCH v4 0/5] ARM: decompressor: use by-VA cache maintenance for v7 cores Ard Biesheuvel
2020-02-26 16:57 ` [PATCH v4 1/5] efi/arm: Work around missing cache maintenance in decompressor handover Ard Biesheuvel
2020-02-26 16:57 ` [PATCH v4 2/5] efi/arm: Pass start and end addresses to cache_clean_flush() Ard Biesheuvel
2020-02-26 16:57 ` [PATCH v4 3/5] ARM: decompressor: factor out routine to obtain the inflated image size Ard Biesheuvel
2020-02-26 16:57 ` Ard Biesheuvel [this message]
2020-02-26 16:57 ` [PATCH v4 5/5] ARM: decompressor: switch to by-VA cache maintenance for v7 cores Ard Biesheuvel
2020-02-26 19:14 ` [PATCH v4 0/5] ARM: decompressor: use " Tony Lindgren
2020-02-27 10:11 ` Linus Walleij
2020-02-27 16:01 ` Marc Zyngier
2020-02-27 16:47 ` Ard Biesheuvel
2020-02-27 16:53 ` Marc Zyngier
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