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[2607:7c80:54:e::133]) by mx.google.com with ESMTPS id b5si9257237pgw.366.2019.06.23.22.44.11 for (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Sun, 23 Jun 2019 22:44:11 -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=gnB13sR1; 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=Oojq5kWgKyQ3wQ3E9C05rFdmIhyLa9IRTYHnqrokUgc=; b=gnB13sR18GLBVsZsJwTxXb3EoD RRnxn3LyhiZ85fsirsfi0/PTcHqG5BX2kl6hnhlYAvACZsBMRqnU+VN9heGqIyOqfKj4Y+DzHF+qG FBpb826uJvdE6kBG30tQDqbcLaDAhuht4VzYt3QALTZCTBJhCAkz8UDaWDpUfi5AIuFQpWwXtxyG6 YGXhaX2RwwRQHYabQiatM/eh/PDre8svDzJ+cA31dr1wLXLgknNIgtU7bLY+iowRrA+Wj8GYC+7g2 dPge0M3eqUFDdQ5vFL5GoOX9SQe6x9QwhNG54tBvjS0aGNkmO/ULNw0ib5I6lzxS0y3gwcdSxTuZs 5QY+sAXg==; 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 1hfHlx-0006wG-E0; Mon, 24 Jun 2019 05:44:10 +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 Subject: [PATCH 16/17] riscv: clear the instruction cache and all registers when booting Date: Mon, 24 Jun 2019 07:43:10 +0200 Message-Id: <20190624054311.30256-17-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: When we get booted we want a clear slate without any leaks from previous supervisors or the firmware. Flush the instruction cache and then clear all registers to known good values. This is really important for the upcoming nommu support that runs on M-mode, but can't really harm when running in S-mode either. Vaguely based on the concepts from opensbi. Signed-off-by: Christoph Hellwig --- arch/riscv/kernel/head.S | 85 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 85 insertions(+) diff --git a/arch/riscv/kernel/head.S b/arch/riscv/kernel/head.S index a4c170e41a34..74feb17737b4 100644 --- a/arch/riscv/kernel/head.S +++ b/arch/riscv/kernel/head.S @@ -11,6 +11,7 @@ #include #include #include +#include __INIT ENTRY(_start) @@ -19,6 +20,12 @@ ENTRY(_start) csrw CSR_XIP, zero #ifdef CONFIG_M_MODE + /* flush the instruction cache */ + fence.i + + /* Reset all registers except ra, a0, a1 */ + call reset_regs + /* * The hartid in a0 is expected later on, and we have no firmware * to hand it to us. @@ -168,6 +175,84 @@ relocate: j .Lsecondary_park END(_start) +#ifdef CONFIG_M_MODE +ENTRY(reset_regs) + li sp, 0 + li gp, 0 + li tp, 0 + li t0, 0 + li t1, 0 + li t2, 0 + li s0, 0 + li s1, 0 + li a2, 0 + li a3, 0 + li a4, 0 + li a5, 0 + li a6, 0 + li a7, 0 + li s2, 0 + li s3, 0 + li s4, 0 + li s5, 0 + li s6, 0 + li s7, 0 + li s8, 0 + li s9, 0 + li s10, 0 + li s11, 0 + li t3, 0 + li t4, 0 + li t5, 0 + li t6, 0 + csrw sscratch, 0 + +#ifdef CONFIG_FPU + csrr t0, misa + andi t0, t0, (COMPAT_HWCAP_ISA_F | COMPAT_HWCAP_ISA_D) + bnez t0, .Lreset_regs_done + + li t1, SR_FS + csrs sstatus, t1 + fmv.s.x f0, zero + fmv.s.x f1, zero + fmv.s.x f2, zero + fmv.s.x f3, zero + fmv.s.x f4, zero + fmv.s.x f5, zero + fmv.s.x f6, zero + fmv.s.x f7, zero + fmv.s.x f8, zero + fmv.s.x f9, zero + fmv.s.x f10, zero + fmv.s.x f11, zero + fmv.s.x f12, zero + fmv.s.x f13, zero + fmv.s.x f14, zero + fmv.s.x f15, zero + fmv.s.x f16, zero + fmv.s.x f17, zero + fmv.s.x f18, zero + fmv.s.x f19, zero + fmv.s.x f20, zero + fmv.s.x f21, zero + fmv.s.x f22, zero + fmv.s.x f23, zero + fmv.s.x f24, zero + fmv.s.x f25, zero + fmv.s.x f26, zero + fmv.s.x f27, zero + fmv.s.x f28, zero + fmv.s.x f29, zero + fmv.s.x f30, zero + fmv.s.x f31, zero + csrw fcsr, 0 +#endif /* CONFIG_FPU */ +.Lreset_regs_done: + ret +END(reset_regs) +#endif /* CONFIG_M_MODE */ + __PAGE_ALIGNED_BSS /* Empty zero page */ .balign PAGE_SIZE -- 2.20.1