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Fri, 3 Dec 2021 20:26:06 +0000 (GMT) X-AuditID: cbfec7f5-bddff70000002814-3e-61aa7d5e8b96 Received: from eusmtip2.samsung.com ( [203.254.199.222]) by eusmgms2.samsung.com (EUCPMTA) with SMTP id B3.A1.09404.E5D7AA16; Fri, 3 Dec 2021 20:26:06 +0000 (GMT) Received: from localhost (unknown [106.120.51.46]) by eusmtip2.samsung.com (KnoxPortal) with ESMTPA id 20211203202606eusmtip28913d9fbb849bbdcf5b897f793e0b712~9WISp_xzR0790307903eusmtip2-; Fri, 3 Dec 2021 20:26:06 +0000 (GMT) From: =?utf-8?q?=C5=81ukasz_Stelmach?= To: buildroot@buildroot.org Date: Fri, 3 Dec 2021 21:25:59 +0100 Message-Id: <20211203202559.253726-1-l.stelmach@samsung.com> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 Organization: Samsung R&D Institute Poland X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFvrGIsWRmVeSWpSXmKPExsWy7djPc7pxtasSDXa/NbZ43rCV1eLmoRWM FmuP3GW36Hzzjt2BxWPemmqPy+/nsnv0bVnFGMAcxWWTkpqTWZZapG+XwJVx4rBSwVaBivaJ E9kbGO/ydjFyckgImEj8ujCPvYuRi0NIYAWjxJGtF1kgnC+MEq/2nIdyPjNKdE9+wwrTMmf6 T3YQW0hgOaPE6pvZEEXPGSUae+azgCTYBBwl+peeAGsQEZCW+H7vLCtIEbPAQkaJP0+es4Ek hAWsJd4uagKbxCKgKvFh/0GwOK+AjcTe5i9MENvkJdquT2eEiAtKnJz5BGwBv4CWxJqm62A2 M1BN89bZzCALJATmckhsPLSaHaLZRWLjsyXMELawxKvjW6DiMhL/d84HWsABZNdLTJ5kBtHb wyixbc4PFogaa4k7536xgdQwC2hKrN+lDxF2lLiy9CgrRCufxI23ghAn8ElM2jadGSLMK9HR JgRRrSKxrn8P1EApid5XKxghSjwkHl+3m8CoOAvJX7OQ/DILYe0CRuZVjOKppcW56anFxnmp 5XrFibnFpXnpesn5uZsYgUnj9L/jX3cwrnj1Ue8QIxMH4yFGCQ5mJRFek8pViUK8KYmVValF +fFFpTmpxYcYpTlYlMR5Rf40JAoJpCeWpGanphakFsFkmTg4pRqYeiSCRMtk1FNn/z6qel1x wecV/9dxPmYreVftFF7Tzesrv0Bvrs209G8WRmb2EgcUzE87fYtyDDxv2vHYbWbB2S0939Zo O7s15kzvsbFtUy6PupQZuVVbqPbD9mivjOfpaXdmabQfNVp47rbQ74A/cmXKc08Wu230sy8/ U1d4c57DAZ4doTOfrpa7Nc93+/WyWUEXb2k8XrphZ86CTxLV2d93fw6sXtahMLGVf0m346lZ xjcblQw8Trewn3waEhURMGeT1HWu+K25PdfXFXv2vu0tbT2y71KWcU0TtwJjKV9X8med9MMd zDc2Hzr38pDxtddXpz3c0nJYu3xlyuvb6T71S+UW/hE2Onz0UoGvEktxRqKhFnNRcSIAablp W4kDAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFvrALMWRmVeSWpSXmKPExsVy+t/xe7pxtasSDQ4dkrR43rCV1eLmoRWM FmuP3GW36Hzzjt2BxWPemmqPy+/nsnv0bVnFGMAcpWdTlF9akqqQkV9cYqsUbWhhpGdoaaFn ZGKpZ2hsHmtlZKqkb2eTkpqTWZZapG+XoJdx4rBSwVaBivaJE9kbGO/ydjFyckgImEjMmf6T vYuRi0NIYCmjxNn+btYuRg6ghJTEyrnpEDXCEn+udbFB1DxllHjauYINJMEm4CjRv/QEK4gt IiAt8f3eWVaQImaBhYwSm/afBysSFrCWeLuoiR3EZhFQlfiw/yBYnFfARmJv8xcmiA3yEm3X pzNCxAUlTs58wgJyBLOAusT6eUIgYX4BLYk1TddZQGxmoPLmrbOZJzAKzELSMQuhYxaSqgWM zKsYRVJLi3PTc4uN9IoTc4tL89L1kvNzNzECg37bsZ9bdjCufPVR7xAjEwfjIUYJDmYlEV6T ylWJQrwpiZVVqUX58UWlOanFhxhNgT6YyCwlmpwPjLu8knhDMwNTQxMzSwNTSzNjJXFez4KO RCGB9MSS1OzU1ILUIpg+Jg5OqQamPZ7n1nn8dN7xXneP3GQVOc7fN/ed6nQIzVl879QvT5vW NYlz5Bzyu83ZEwP61NrVEnYGrUxY3Don5tiBfVFBuzqPaWp8skn7/CT/uu47/4mH/Gffei9y jP3nJ5XP93qCV/MedpBQW8nDxvj2rLN1pVW7x4apCpPqo93qFRuiOSNea73snK+38c5a03TW B+qOZpXBOtmN/2vz/RR2WyndiU46GtvIFs6vNjdQYtOciEUVMeuesJ47eZpRdtmceUHr5Ys9 L99dWd/roieoMm2+f/7uxkNcf66Khz8MbWLR87oT8rA2YEvcipf7JQ9yePYefeuqddjw1uZq bhv7XWeSn9bLTt/8a03rhtCNFQ+VWIozEg21mIuKEwGnfiwXAwMAAA== X-CMS-MailID: 20211203202606eucas1p1c5fd10ed5661e22dfea6199a69b7414b X-Msg-Generator: CA X-RootMTR: 20211203202606eucas1p1c5fd10ed5661e22dfea6199a69b7414b X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20211203202606eucas1p1c5fd10ed5661e22dfea6199a69b7414b References: Subject: [Buildroot] [PATCH 1/1] arch/arm: Choose page size for AArch64 X-BeenThere: buildroot@buildroot.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussion and development of buildroot List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: =?utf-8?q?=C5=81ukasz_Stelmach?= , Thomas Petazzoni , Marek Szyprowski Errors-To: buildroot-bounces@buildroot.org Sender: "buildroot" MMUs on AArch64 support three different page sizes: 4 kB, 16 kB, and 64 kB. It is OS kernel's task to choose the configuration during boot. Linux kernel can be compiled to support different page size. To run on a system with pages larger than 4 kB userland binaries need to be properly aligned during the linking process. However, binaries prepared for systems with larger pages can run on systems with smaller pages. Signed-off-by: Łukasz Stelmach --- arch/Config.in.arm | 24 ++++++++++++++++++++++++ arch/arch.mk.arm | 12 ++++++++++++ 2 files changed, 36 insertions(+) create mode 100644 arch/arch.mk.arm diff --git a/arch/Config.in.arm b/arch/Config.in.arm index 4c0910e4f8..bc6452878d 100644 --- a/arch/Config.in.arm +++ b/arch/Config.in.arm @@ -930,5 +930,29 @@ config BR2_READELF_ARCH_NAME default "ARM" if BR2_arm || BR2_armeb default "AArch64" if BR2_aarch64 || BR2_aarch64_be +choice + prompt "Aarch64 MMU Page Size" + default BR2_ARM_PAGE_SIZE_4K + depends on BR2_aarch64 || BR2_aarch64_be + help + Choose MMU page size + +config BR2_ARM_PAGE_SIZE_4K + bool "4KB" + +config BR2_ARM_PAGE_SIZE_16K + bool "16KB" + +config BR2_ARM_PAGE_SIZE_64K + bool "64KB" + +endchoice + +config BR2_ARM_PAGE_SIZE + string + default "4K" if BR2_ARM_PAGE_SIZE_4K + default "16K" if BR2_ARM_PAGE_SIZE_16K + default "64K" if BR2_ARM_PAGE_SIZE_64K + # vim: ft=kconfig # -*- mode:kconfig; -*- diff --git a/arch/arch.mk.arm b/arch/arch.mk.arm new file mode 100644 index 0000000000..ef65c60f6c --- /dev/null +++ b/arch/arch.mk.arm @@ -0,0 +1,12 @@ +ifeq ($(filter y, $(BR2_aarch64) $(BR2_aarch64_be)), y) + +# Explicitly set LD's "max-page-size" instead of relying on some defaults +ifeq ($(BR2_ARM_PAGE_SIZE_4K),y) +ARCH_TOOLCHAIN_WRAPPER_OPTS += -Wl,-z,max-page-size=4096 +else ifeq ($(BR2_ARM_PAGE_SIZE_16K),y) +ARCH_TOOLCHAIN_WRAPPER_OPTS += -Wl,-z,max-page-size=32768 +else ifeq ($(BR2_ARM_PAGE_SIZE_64K),y) +ARCH_TOOLCHAIN_WRAPPER_OPTS += -Wl,-z,max-page-size=65536 +endif + +endif