From patchwork Tue Oct 22 09:27:31 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yicong Yang X-Patchwork-Id: 13845469 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 25DEED1CDCB for ; Tue, 22 Oct 2024 09:54:35 +0000 (UTC) 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-Type: Content-Transfer-Encoding:MIME-Version:References:In-Reply-To:Message-ID:Date :Subject:CC:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=zEhwGm+2scsTPh8Aj/1TTbOnrdc6v5qlEg7gvaeHKHs=; b=INnVn93/VeZWvrma8JxxnpW2Ua vYcxVZxLEPGRGZE9l5pDcsoXjUpTqhklC/x0IRw7fAYyeK8FonZsSWsfjLEaY/9EawH9KjmvN4s5h uyggyLBulRUmKKqwXD3D//eD3bxfVQBfXOFqR9ZU1N/lOzoKBVOK5YeMpIfOua8KBIrjp507aa9M7 hBOjDgTiY9nbi+V21mQcnSZJZ1zUwFo9ciqTnDiNvFPJSVg0ZSlsq1OTq3TTq2AvKXUX9gAlR+yIO 9/kQPsHCJnNYA19FHnfd0bUhZ2ZNmxrBoqC6Oh6nf8TNSmOcaJRmkyem6V2H8BLolFuCVTihEYrpc BqM7f5dA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1t3Baq-0000000ARMP-2AHs; Tue, 22 Oct 2024 09:54:24 +0000 Received: from szxga05-in.huawei.com ([45.249.212.191]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1t3BBN-0000000ALsR-2MLa for linux-arm-kernel@lists.infradead.org; Tue, 22 Oct 2024 09:28:08 +0000 Received: from mail.maildlp.com (unknown [172.19.163.44]) by szxga05-in.huawei.com (SkyGuard) with ESMTP id 4XXmvF50Llz1HLMj; Tue, 22 Oct 2024 17:23:37 +0800 (CST) Received: from kwepemd200014.china.huawei.com (unknown [7.221.188.8]) by mail.maildlp.com (Postfix) with ESMTPS id 7962014010D; Tue, 22 Oct 2024 17:27:57 +0800 (CST) Received: from localhost.localdomain (10.50.165.33) by kwepemd200014.china.huawei.com (7.221.188.8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1258.34; Tue, 22 Oct 2024 17:27:56 +0800 From: Yicong Yang To: , , , , , CC: , , , , , , , , Subject: [PATCH v3 2/5] arm64: setup: name 'tcr2' register Date: Tue, 22 Oct 2024 17:27:31 +0800 Message-ID: <20241022092734.59984-3-yangyicong@huawei.com> X-Mailer: git-send-email 2.31.0 In-Reply-To: <20241022092734.59984-1-yangyicong@huawei.com> References: <20241022092734.59984-1-yangyicong@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.50.165.33] X-ClientProxiedBy: dggems702-chm.china.huawei.com (10.3.19.179) To kwepemd200014.china.huawei.com (7.221.188.8) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241022_022805_895300_5931167D X-CRM114-Status: UNSURE ( 9.70 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Yicong Yang TCR2_EL1 introduced some additional controls besides TCR_EL1. Currently only PIE is supported and enabled by writing TCR2_EL1 directly if PIE detected. Introduce a named register 'tcr2' just like 'tcr' we've already had. It'll be initialized to 0 and updated if certain feature detected and needs to be enabled. Touch the TCR2_EL1 registers at last with the updated 'tcr2' value if FEAT_TCR2 supported by checking ID_AA64MMFR3_EL1.TCRX. Then we can extend the support of other features controlled by TCR2_EL1. Signed-off-by: Yicong Yang Reviewed-by: Catalin Marinas --- arch/arm64/mm/proc.S | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/arch/arm64/mm/proc.S b/arch/arm64/mm/proc.S index 8abdc7fed321..ccbae4525891 100644 --- a/arch/arm64/mm/proc.S +++ b/arch/arm64/mm/proc.S @@ -465,10 +465,12 @@ SYM_FUNC_START(__cpu_setup) */ mair .req x17 tcr .req x16 + tcr2 .req x15 mov_q mair, MAIR_EL1_SET mov_q tcr, TCR_T0SZ(IDMAP_VA_BITS) | TCR_T1SZ(VA_BITS_MIN) | TCR_CACHE_FLAGS | \ TCR_SHARED | TCR_TG_FLAGS | TCR_KASLR_FLAGS | TCR_ASID16 | \ TCR_TBI0 | TCR_A1 | TCR_KASAN_SW_FLAGS | TCR_MTE_FLAGS + mov tcr2, xzr tcr_clear_errata_bits tcr, x9, x5 @@ -525,11 +527,16 @@ alternative_else_nop_endif #undef PTE_MAYBE_NG #undef PTE_MAYBE_SHARED - mov x0, TCR2_EL1x_PIE - msr REG_TCR2_EL1, x0 + orr tcr2, tcr2, TCR2_EL1x_PIE .Lskip_indirection: + mrs_s x1, SYS_ID_AA64MMFR3_EL1 + ubfx x1, x1, #ID_AA64MMFR3_EL1_TCRX_SHIFT, #4 + cbz x1, 1f + msr REG_TCR2_EL1, tcr2 +1: + /* * Prepare SCTLR */ @@ -538,4 +545,5 @@ alternative_else_nop_endif .unreq mair .unreq tcr + .unreq tcr2 SYM_FUNC_END(__cpu_setup)