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[2607:7c80:54:e::133]) by mx.google.com with ESMTPS id 59si10154952plp.90.2019.06.23.22.43.51 for (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Sun, 23 Jun 2019 22:43:51 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of batv+84882ec255bc51113d1a+5783+infradead.org+hch@bombadil.srs.infradead.org designates 2607:7c80:54:e::133 as permitted sender) client-ip=2607:7c80:54:e::133; Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=bombadil.20170209 header.b=Ox0Bj2s2; spf=pass (google.com: best guess record for domain of batv+84882ec255bc51113d1a+5783+infradead.org+hch@bombadil.srs.infradead.org designates 2607:7c80:54:e::133 as permitted sender) smtp.mailfrom=BATV+84882ec255bc51113d1a+5783+infradead.org+hch@bombadil.srs.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From :Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=43pRHKdJKqNssrr4/Vc0cDK/nlhOlcebDC3ttvLu+nk=; b=Ox0Bj2s2AYtMiNqOyzVUJu1aca 4Zw5sJu947Gj5rs0jUIlbbOtlbwYiuHZ0nJ1wtQi79umOkWFdlOji03dK+QH22LmwJp2C8vJ56/Fw VBYObyjWlQcJ9h5SQj6t76j0JD5TudW+arpOJd2w7RxIDG8pwuO4dR1jb3JpSDfRzc7ZczKYWm7vh QI2c2xxg9ZuRIDvDgzexiDXDbZSYqdKgNNN3aPwHwGLG857aQEXAdzB2Nf4gvK+YbgR5Imuqbwebr zBivLC6z+ob0BD9JpbwnxUy0vPPLYKipdDiBzZ5jLr7Jy5pym/AnznE86d12FYY1jmZQrC/xeH+IC s5lNwFPQ==; Received: from 213-225-6-159.nat.highway.a1.net ([213.225.6.159] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1hfHld-0006Xj-5S; Mon, 24 Jun 2019 05:43:49 +0000 From: Christoph Hellwig To: Palmer Dabbelt , Paul Walmsley Cc: Damien Le Moal , linux-riscv@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Damien Le Moal Subject: [PATCH 10/17] riscv: read the hart ID from mhartid on boot Date: Mon, 24 Jun 2019 07:43:04 +0200 Message-Id: <20190624054311.30256-11-hch@lst.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190624054311.30256-1-hch@lst.de> References: <20190624054311.30256-1-hch@lst.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Damien Le Moal When in M-Mode, we can use the mhartid CSR to get the ID of the running HART. Doing so, direct M-Mode boot without firmware is possible. Signed-off-by: Damien Le Moal Signed-off-by: Christoph Hellwig --- arch/riscv/kernel/head.S | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/riscv/kernel/head.S b/arch/riscv/kernel/head.S index e5fa5481aa99..a4c170e41a34 100644 --- a/arch/riscv/kernel/head.S +++ b/arch/riscv/kernel/head.S @@ -18,6 +18,14 @@ ENTRY(_start) csrw CSR_XIE, zero csrw CSR_XIP, zero +#ifdef CONFIG_M_MODE + /* + * The hartid in a0 is expected later on, and we have no firmware + * to hand it to us. + */ + csrr a0, mhartid +#endif + /* Load the global pointer */ .option push .option norelax -- 2.20.1