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=-9.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY, USER_AGENT_GIT autolearn=ham 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 42201C3A5A9 for ; Mon, 4 May 2020 23:23:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1EFBB2068E for ; Mon, 4 May 2020 23:23:56 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="DPftL38k" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728475AbgEDXXz (ORCPT ); Mon, 4 May 2020 19:23:55 -0400 Received: from aserp2120.oracle.com ([141.146.126.78]:51054 "EHLO aserp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728452AbgEDXXu (ORCPT ); Mon, 4 May 2020 19:23:50 -0400 Received: from pps.filterd (aserp2120.oracle.com [127.0.0.1]) by aserp2120.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 044NJIXk097247; Mon, 4 May 2020 23:22:28 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references; s=corp-2020-01-29; bh=e/TtFKtMhJ/896wUcLf0LH9xhAEKzCC+QAaSL5idCiQ=; b=DPftL38k44J1lz5KHTnniD0E36T6TfnO+3/62pHOLtS1IIdBG+vky+PjTZKkjJVQZ+yX tUkrWSceDt+zYZFTz2lkcDvg+Qc1u9nut4z+m8+PzUX2Zb32Ff7DXnlwFkptxYtiO+YJ XxrTzgtkzwluVxxQxhUn2lEezHG8+sU8G0XtR47fwBp3epVmUh9c10tm+0Uk/ROmnIbd 0F4jAIDGIPwE4y3oxMPlRvCPGAZN5WPkcczN8OUzAyhBiqzeGRzvcnW0Cx7XCnHgWKYJ rMIAVjxdSRX8Wcpn33P2OwEf84SBFq8tF9ZhrylZ806jyB0XvE3gMD9/mqJntPCr6pSs ig== Received: from aserp3030.oracle.com (aserp3030.oracle.com [141.146.126.71]) by aserp2120.oracle.com with ESMTP id 30s0tm9t16-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 04 May 2020 23:22:28 +0000 Received: from pps.filterd (aserp3030.oracle.com [127.0.0.1]) by aserp3030.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 044NGhiC082611; Mon, 4 May 2020 23:22:28 GMT Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by aserp3030.oracle.com with ESMTP id 30sjdrpec1-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 04 May 2020 23:22:28 +0000 Received: from abhmp0012.oracle.com (abhmp0012.oracle.com [141.146.116.18]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 044NMQ0t004107; Mon, 4 May 2020 23:22:26 GMT Received: from tomti.i.net-space.pl (/10.175.189.148) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 04 May 2020 16:22:26 -0700 From: Daniel Kiper To: grub-devel@gnu.org, linux-kernel@vger.kernel.org, trenchboot-devel@googlegroups.com, x86@kernel.org Cc: alexander.burmashev@oracle.com, andrew.cooper3@citrix.com, ard.biesheuvel@linaro.org, dpsmith@apertussolutions.com, eric.snowberg@oracle.com, javierm@redhat.com, kanth.ghatraju@oracle.com, konrad.wilk@oracle.com, krystian.hebel@3mdeb.com, lukasz.hawrylko@linux.intel.com, michal.zygowski@3mdeb.com, mjg59@google.com, phcoder@gmail.com, pirot.krol@3mdeb.com, pjones@redhat.com, ross.philipson@oracle.com Subject: [GRUB PATCH RFC 06/18] mmap: Add grub_mmap_get_lowest() and grub_mmap_get_highest() Date: Tue, 5 May 2020 01:21:20 +0200 Message-Id: <20200504232132.23570-7-daniel.kiper@oracle.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20200504232132.23570-1-daniel.kiper@oracle.com> References: <20200504232132.23570-1-daniel.kiper@oracle.com> X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9611 signatures=668687 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 suspectscore=2 mlxscore=0 bulkscore=0 adultscore=0 phishscore=0 mlxlogscore=999 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2005040181 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9611 signatures=668687 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 malwarescore=0 mlxscore=0 priorityscore=1501 lowpriorityscore=0 spamscore=0 suspectscore=2 phishscore=0 clxscore=1015 bulkscore=0 mlxlogscore=999 adultscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2005040181 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The functions calculate lowest and highest available RAM addresses respectively. Both functions are needed to calculate PMR boundaries for Intel TXT secure launcher introduced by subsequent patches. Signed-off-by: Daniel Kiper --- grub-core/mmap/mmap.c | 64 +++++++++++++++++++++++++++++++++++++++++++++++++++ include/grub/memory.h | 3 +++ 2 files changed, 67 insertions(+) diff --git a/grub-core/mmap/mmap.c b/grub-core/mmap/mmap.c index b569cb23b..cf4b69f56 100644 --- a/grub-core/mmap/mmap.c +++ b/grub-core/mmap/mmap.c @@ -340,6 +340,70 @@ grub_mmap_unregister (int handle) #endif /* ! GRUB_MMAP_REGISTER_BY_FIRMWARE */ +typedef struct +{ + grub_uint64_t addr; + grub_uint64_t limit; +} addr_limit_t; + +/* Helper for grub_mmap_get_lowest(). */ +static int +lowest_hook (grub_uint64_t addr, grub_uint64_t size, grub_memory_type_t type, + void *data) +{ + addr_limit_t *al = data; + + if (type != GRUB_MEMORY_AVAILABLE) + return 0; + + if (addr >= al->limit) + al->addr = grub_min (al->addr, addr); + + if ((addr < al->limit) && ((addr + size) > al->limit)) + al->addr = al->limit; + + return 0; +} + +grub_uint64_t +grub_mmap_get_lowest (grub_uint64_t limit) +{ + addr_limit_t al = {~0, limit}; + + grub_mmap_iterate (lowest_hook, &al); + + return al.addr; +} + +/* Helper for grub_mmap_get_highest(). */ +static int +highest_hook (grub_uint64_t addr, grub_uint64_t size, grub_memory_type_t type, + void *data) +{ + addr_limit_t *al = data; + + if (type != GRUB_MEMORY_AVAILABLE) + return 0; + + if ((addr + size) < al->limit) + al->addr = grub_max (al->addr, addr + size); + + if ((addr < al->limit) && ((addr + size) >= al->limit)) + al->addr = al->limit; + + return 0; +} + +grub_uint64_t +grub_mmap_get_highest (grub_uint64_t limit) +{ + addr_limit_t al = {0, limit}; + + grub_mmap_iterate (highest_hook, &al); + + return al.addr; +} + #define CHUNK_SIZE 0x400 struct badram_entry { diff --git a/include/grub/memory.h b/include/grub/memory.h index 6da114a1b..8f22f7525 100644 --- a/include/grub/memory.h +++ b/include/grub/memory.h @@ -69,6 +69,9 @@ void *grub_mmap_malign_and_register (grub_uint64_t align, grub_uint64_t size, void grub_mmap_free_and_unregister (int handle); +extern grub_uint64_t grub_mmap_get_lowest (grub_uint64_t limit); +extern grub_uint64_t grub_mmap_get_highest (grub_uint64_t limit); + #ifndef GRUB_MMAP_REGISTER_BY_FIRMWARE struct grub_mmap_region -- 2.11.0