From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 706C2C3F2D1 for ; Thu, 5 Mar 2020 17:23:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 44BAB20637 for ; Thu, 5 Mar 2020 17:23:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1583429014; bh=Eqxcwe6hqlaj8Q4EMkWE8eXCmsUaeSppDr69o8tGO8c=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=2g1vbOlEivOV/K+kFqV/CUKhJhW+ur5Vr0Jbe9749rb7gvdlqlmU1YnTaTMsy76fS 04M5Ha8IaCNGzWf9w/xbTIS+D83KztMROyy5jvfTzV+Da5vQPmo00LvICYFJ5qFpLh vHZD6iHbLOiCayLsj/uDAoJJbteZ7fp4xRExzFkw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727198AbgCERNl (ORCPT ); Thu, 5 Mar 2020 12:13:41 -0500 Received: from mail.kernel.org ([198.145.29.99]:39090 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727076AbgCERNf (ORCPT ); Thu, 5 Mar 2020 12:13:35 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 467BE20870; Thu, 5 Mar 2020 17:13:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1583428415; bh=Eqxcwe6hqlaj8Q4EMkWE8eXCmsUaeSppDr69o8tGO8c=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Hu5Cpqt9MrLQlTT4RCmJzQUq5IHIRtjrFunEQtIK+4Al5RUHwWLFCIWNwH81l1qLK kWyjW8CpdRttXrTQ1ZrDol6EL4RBpTrTFtElENJ7hZQHHIb+ase0RIKfjUWy5YlxQW dZwK+i3rWcWw6AOUVWAlv50f4zOqOl4+9WDe1lLk= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Greentime Hu , Palmer Dabbelt , Sasha Levin , linux-riscv@lists.infradead.org Subject: [PATCH AUTOSEL 5.5 18/67] riscv: set pmp configuration if kernel is running in M-mode Date: Thu, 5 Mar 2020 12:12:19 -0500 Message-Id: <20200305171309.29118-18-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200305171309.29118-1-sashal@kernel.org> References: <20200305171309.29118-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Greentime Hu [ Upstream commit c68a9032299e837b56d356de9250c93094f7e0e3 ] When the kernel is running in S-mode, the expectation is that the bootloader or SBI layer will configure the PMP to allow the kernel to access physical memory. But, when the kernel is running in M-mode and is started with the ELF "loader", there's probably no bootloader or SBI layer involved to configure the PMP. Thus, we need to configure the PMP ourselves to enable the kernel to access all regions. Signed-off-by: Greentime Hu Reviewed-by: Palmer Dabbelt Signed-off-by: Palmer Dabbelt Signed-off-by: Sasha Levin --- arch/riscv/include/asm/csr.h | 12 ++++++++++++ arch/riscv/kernel/head.S | 6 ++++++ 2 files changed, 18 insertions(+) diff --git a/arch/riscv/include/asm/csr.h b/arch/riscv/include/asm/csr.h index 435b65532e294..8e18d2c64399d 100644 --- a/arch/riscv/include/asm/csr.h +++ b/arch/riscv/include/asm/csr.h @@ -72,6 +72,16 @@ #define EXC_LOAD_PAGE_FAULT 13 #define EXC_STORE_PAGE_FAULT 15 +/* PMP configuration */ +#define PMP_R 0x01 +#define PMP_W 0x02 +#define PMP_X 0x04 +#define PMP_A 0x18 +#define PMP_A_TOR 0x08 +#define PMP_A_NA4 0x10 +#define PMP_A_NAPOT 0x18 +#define PMP_L 0x80 + /* symbolic CSR names: */ #define CSR_CYCLE 0xc00 #define CSR_TIME 0xc01 @@ -100,6 +110,8 @@ #define CSR_MCAUSE 0x342 #define CSR_MTVAL 0x343 #define CSR_MIP 0x344 +#define CSR_PMPCFG0 0x3a0 +#define CSR_PMPADDR0 0x3b0 #define CSR_MHARTID 0xf14 #ifdef CONFIG_RISCV_M_MODE diff --git a/arch/riscv/kernel/head.S b/arch/riscv/kernel/head.S index a4242be66966b..e4d9baf973232 100644 --- a/arch/riscv/kernel/head.S +++ b/arch/riscv/kernel/head.S @@ -58,6 +58,12 @@ _start_kernel: /* Reset all registers except ra, a0, a1 */ call reset_regs + /* Setup a PMP to permit access to all of memory. */ + li a0, -1 + csrw CSR_PMPADDR0, a0 + li a0, (PMP_A_NAPOT | PMP_R | PMP_W | PMP_X) + csrw CSR_PMPCFG0, a0 + /* * The hartid in a0 is expected later on, and we have no firmware * to hand it to us. -- 2.20.1