From mboxrd@z Thu Jan 1 00:00:00 1970 Delivery-date: Fri, 19 May 2023 09:45:59 +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 1pzuoK-006QwG-J3 for lore@lore.pengutronix.de; Fri, 19 May 2023 09:45:59 +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 1pzuoH-0002dP-V7 for lore@pengutronix.de; Fri, 19 May 2023 09:45:58 +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:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=/KoGER+oyHfvfZlM3K6PXte3D3j5o9l6OyouECmnNiY=; b=pUSopIOLQnHSv+5yECL6m6EOSD hehOMWzDppfeNNAhOkw08nm6iIzqPoWF73MTDb0y74StoqkIcg8KwHwCwD7rLXUaO3mfDeViZdNBe NFoNZvYnVJm0jD0Pk3L0eQk4GhjHCeoxEhbnA6cuGE3ZtBt0Lv1QhvI8xfqotjFtNO/j3J1K7GqCf ud7v0Uvp7HlRXEp9yNxQuih5R6nTs5ot/WWctaOmhWqgoaxmAIXIdYPak5trPEynK1FYj0NSWzhOl HLhZwllsG63Pnbi1tfmKtaEljs0VInayuuYKfupf5sxfwht+iNsS5PsQh6RgLPAoRvCb1YReH6E0/ GfjCMypA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1pzunB-00FPS8-0p; Fri, 19 May 2023 07:44:49 +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 1pzun7-00FPRL-2n for barebox@lists.infradead.org; Fri, 19 May 2023 07:44:47 +0000 Received: from ptx.hi.pengutronix.de ([2001:67c:670:100:1d::c0]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1pzun6-0002B2-1b; Fri, 19 May 2023 09:44:44 +0200 Received: from sha by ptx.hi.pengutronix.de with local (Exim 4.92) (envelope-from ) id 1pzun5-0004y0-6K; Fri, 19 May 2023 09:44:43 +0200 Date: Fri, 19 May 2023 09:44:43 +0200 From: Sascha Hauer To: Ahmad Fatoum Cc: Barebox List Message-ID: <20230519074443.GH29365@pengutronix.de> References: <20230517090340.3954615-1-s.hauer@pengutronix.de> <20230517090340.3954615-32-s.hauer@pengutronix.de> <20230517143935.GB29365@pengutronix.de> <8d824d8d-91d2-e0dc-ddb5-f51b7ea9fccc@pengutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <8d824d8d-91d2-e0dc-ddb5-f51b7ea9fccc@pengutronix.de> X-Sent-From: Pengutronix Hildesheim X-URL: http://www.pengutronix.de/ X-Accept-Language: de,en X-Accept-Content-Type: text/plain User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230519_004445_907485_1475333F X-CRM114-Status: GOOD ( 22.92 ) 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=-4.7 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 autolearn=unavailable autolearn_force=no version=3.4.2 Subject: Re: [PATCH v2 31/34] ARM: mmu32: read TTB value from register 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) On Fri, May 19, 2023 at 08:53:34AM +0200, Ahmad Fatoum wrote: > On 17.05.23 16:39, Sascha Hauer wrote: > > On Wed, May 17, 2023 at 03:58:01PM +0200, Ahmad Fatoum wrote: > >> On 17.05.23 11:03, Sascha Hauer wrote: > >>> Instead of relying on a variable for the location of the TTB which we > >>> have to initialize in both PBL and barebox proper, just read the value > >>> back from the hardware register. > >> > >> Why not initialize on first call to get_ttb()? > > > > get_ttb() doesn't have access to endmem which we would need to get the > > address for the ttb. > > > > Also we have the value in the hardware register, why not use it? > > I meant initialization using the hardware register. You mean something like: static uint32_t *ttb; static inline uint32_t *get_ttb(void) { if (!ttb) ttb = (uint32_t *)(get_ttbr() & ~0x3fff); return ttb; } If yes, I don't know what this is good for. If no, please explain, I don't seem to understand what you mean. Sascha -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |