From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: mx.groups.io; dkim=missing; spf=none, err=SPF record not found (domain: zhaoxin.com, ip: 203.148.12.81, mailfrom: tigerliu@zhaoxin.com) Received: from ZXSHCAS1.zhaoxin.com (ZXSHCAS1.zhaoxin.com [203.148.12.81]) by groups.io with SMTP; Tue, 17 Sep 2019 04:08:09 -0700 Received: from zxbjmbx3.zhaoxin.com (10.29.252.165) by ZXSHCAS1.zhaoxin.com (10.28.252.161) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1261.35; Tue, 17 Sep 2019 19:08:04 +0800 Received: from zxbjmbx2.zhaoxin.com (10.29.252.164) by zxbjmbx3.zhaoxin.com (10.29.252.165) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1261.35; Tue, 17 Sep 2019 19:08:03 +0800 Received: from zxbjmbx2.zhaoxin.com ([fe80::4d77:9dba:64a8:8ec3]) by zxbjmbx2.zhaoxin.com ([fe80::4d77:9dba:64a8:8ec3%4]) with mapi id 15.01.1261.035; Tue, 17 Sep 2019 19:08:03 +0800 From: "Tiger Liu(BJ-RD)" To: "devel@edk2.groups.io" Subject: [edk2] DxeIpl : create page table, occupied too much memory range Thread-Topic: [edk2] DxeIpl : create page table, occupied too much memory range Thread-Index: AdVtRlaRdipj3s7PQRucZxuSwomlDw== Date: Tue, 17 Sep 2019 11:08:03 +0000 Message-ID: <5eabf2c9104644ba955a4c3a4de983dc@zhaoxin.com> Accept-Language: zh-CN, en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.29.24.53] MIME-Version: 1.0 Return-Path: TigerLiu@zhaoxin.com Content-Language: zh-CN Content-Type: multipart/alternative; boundary="_000_5eabf2c9104644ba955a4c3a4de983dczhaoxincom_" --_000_5eabf2c9104644ba955a4c3a4de983dczhaoxincom_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi, Expert: I have a question about creating page table. If a CPU support 48bit physical address line, then creating page tables(Pag= e size=3D2MB) will occupy too much memory region. Now, developer could only use PcdUse1GPageTable to avoid occupy too much me= mory region? Thanks Best wishes, ????? ????????????????????????????????????????????????????? CONFIDENTIAL NOTE: This email contains confidential or legally privileged information and is f= or the sole use of its intended recipient. Any unauthorized review, use, co= pying or forwarding of this email or the content of this email is strictly = prohibited. --_000_5eabf2c9104644ba955a4c3a4de983dczhaoxincom_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi, Expert:

I have a question about creatin= g page table.

If a CPU support 48bit physical= address line, then creating page tables(Page size=3D2MB) will occupy too m= uch memory region.

 

Now, developer could only use P= cdUse1GPageTable to avoid occupy too much memory region?<= /p>

 

Thanks

 

Best wishes,<= /p>



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