From mboxrd@z Thu Jan 1 00:00:00 1970 Delivery-date: Wed, 17 May 2023 11:05:18 +0200 Received: from metis.ext.pengutronix.de ([2001:67c:670:201:290:27ff:fe1d:cc33]) by lore.white.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1pzD60-0048Zf-0V for lore@lore.pengutronix.de; Wed, 17 May 2023 11:05:18 +0200 Received: from bombadil.infradead.org ([2607:7c80:54:3::133]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1pzD5x-0004m0-2O for lore@pengutronix.de; Wed, 17 May 2023 11:05:18 +0200 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To: Cc:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=EEOhFPiBAqNw9Yy26eFGDceArp06d0mXCXe/6YXn02Q=; b=JME8zP6zeB0cBzMdj+xOWej4Qy LKVIVKHOmoielUXvOul5szeAnqEWFb1YkEEcQiLGA25BX40mSsGhse5Uq+BCcIHRDOPzlKEidlUKn ApIPy1jh3xZP5BnW2Su9XXEj1tGDq9qar4jZZ1xEo3iUS81YMKVTk43+YlWWUjngbFIgrKO4kp9vC E6Crh2aIaFVXdxw4NsjwkBpZ8IT+dH325K6BJXEDWE9FO51dg3Eth1qhlqCR06E0HRlEB4LAxYhzx bRC4Qzq7ncriBkM7Iqg3Qvq4S8kL15xQJ4yxIecYMjYX3vGex9nB5VeA5dd3xoR9sg0vzH3xvwd+f xaA+cszw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1pzD4k-008yWL-1w; Wed, 17 May 2023 09:04:02 +0000 Received: from metis.ext.pengutronix.de ([2001:67c:670:201:290:27ff:fe1d:cc33]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1pzD4Y-008yMj-2R for barebox@lists.infradead.org; Wed, 17 May 2023 09:03:55 +0000 Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1pzD4U-0003zV-2H; Wed, 17 May 2023 11:03:46 +0200 Received: from [2a0a:edc0:0:1101:1d::28] (helo=dude02.red.stw.pengutronix.de) by drehscheibe.grey.stw.pengutronix.de with esmtp (Exim 4.94.2) (envelope-from ) id 1pzD4T-000o77-84; Wed, 17 May 2023 11:03:45 +0200 Received: from sha by dude02.red.stw.pengutronix.de with local (Exim 4.94.2) (envelope-from ) id 1pzD4P-00Gark-Pg; Wed, 17 May 2023 11:03:41 +0200 From: Sascha Hauer To: Barebox List Date: Wed, 17 May 2023 11:03:20 +0200 Message-Id: <20230517090340.3954615-15-s.hauer@pengutronix.de> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230517090340.3954615-1-s.hauer@pengutronix.de> References: <20230517090340.3954615-1-s.hauer@pengutronix.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230517_020350_879753_576BB1C6 X-CRM114-Status: GOOD ( 12.35 ) X-BeenThere: barebox@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "barebox" X-SA-Exim-Connect-IP: 2607:7c80:54:3::133 X-SA-Exim-Mail-From: barebox-bounces+lore=pengutronix.de@lists.infradead.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on metis.ext.pengutronix.de X-Spam-Level: X-Spam-Status: No, score=-4.9 required=4.0 tests=AWL,BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED,SPF_HELO_NONE,SPF_NONE, T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.2 Subject: [PATCH v2 14/34] ARM: mmu: implement MAP_FAULT X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.ext.pengutronix.de) MAP_FAULT can be used for the zero page to make it faulting. Signed-off-by: Sascha Hauer --- arch/arm/cpu/mmu_32.c | 4 ++++ arch/arm/cpu/mmu_64.c | 3 +++ include/mmu.h | 1 + 3 files changed, 8 insertions(+) diff --git a/arch/arm/cpu/mmu_32.c b/arch/arm/cpu/mmu_32.c index 8ec21ee1d2..a1ecc49f03 100644 --- a/arch/arm/cpu/mmu_32.c +++ b/arch/arm/cpu/mmu_32.c @@ -178,6 +178,10 @@ int arch_remap_range(void *start, size_t size, unsigned flags) pte_flags = pte_flags_uncached; pgd_flags = pgd_flags_uncached; break; + case MAP_FAULT: + pte_flags = 0x0; + pgd_flags = 0x0; + break; case ARCH_MAP_WRITECOMBINE: pte_flags = pte_flags_wc; pgd_flags = pgd_flags_wc; diff --git a/arch/arm/cpu/mmu_64.c b/arch/arm/cpu/mmu_64.c index f43ac9a121..a22e0c81ab 100644 --- a/arch/arm/cpu/mmu_64.c +++ b/arch/arm/cpu/mmu_64.c @@ -154,6 +154,9 @@ int arch_remap_range(void *_start, size_t size, unsigned flags) case MAP_UNCACHED: attrs = attrs_uncached_mem(); break; + case MAP_FAULT: + attrs = 0x0; + break; default: return -EINVAL; } diff --git a/include/mmu.h b/include/mmu.h index 2e23853df3..2326cb215a 100644 --- a/include/mmu.h +++ b/include/mmu.h @@ -4,6 +4,7 @@ #define MAP_UNCACHED 0 #define MAP_CACHED 1 +#define MAP_FAULT 2 /* * Depending on the architecture the default mapping can be -- 2.39.2