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OpenVMS V8.3
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目次
まえがき
第 1 章:はじめに
第 2 章:仮想アドレス空間の概要
第 3 章:システム・サービスの 64 ビット・アドレッシングのサポート
第 4 章:メモリ管理 VLM 機能
第 5 章:64 ビット・アドレッシングを対象とする RMS インタフェースの強化
第 6 章:ファイル・システムの 64 ビット・アドレッシングのサポート
第 7 章:OpenVMS Alpha デバイスの 64 ビット・アドレッシングのサポート
第 8 章:OpenVMS Alpha 64 ビット API ガイドライン
第 9 章:64 ビット・アドレッシングをサポートする OpenVMS Alpha ツールおよびユーティリティ
第 10 章:言語およびポインタの 64 ビット・アドレッシング・サポート
第 11 章:DEC C RTL の 64 ビット・アドレッシング・サポート
付録 A :64 ビット・アドレッシングのための C マクロ
付録 B :64 ビット・アドレッシングのための MACRO-32 マクロ
付録 C :64 ビット・プログラム例
付録 D :VLM プログラム例
索引
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OpenVMS ホーム
Open VMS Alpha オペレーティング・システム | HPE 日本

Open VMS Alpha オペレーティング・システム
64 ビット・アドレッシングおよび VLM 機能説明書


目次 索引

付録 D
VLM プログラム例

このサンプル・プログラムは, 第 4 章 で説明したメモリ管理 VLM 機能を紹介します。


/* 
 ***************************************************************************** 
 * 
 * Copyright (c) Digital Equipment Corporation, 1996 All Rights Reserved. 
 * Unpublished rights reserved under the copyright laws of the United States. 
 * 
 * The software contained on this media is proprietary to and embodies the 
 * confidential technology of Digital Equipment Corporation.  Possession, use, 
 * duplication or dissemination of the software and media is authorized only 
 * pursuant to a valid written license from Digital Equipment Corporation. 
 * 
 * RESTRICTED RIGHTS LEGEND   Use, duplication, or disclosure by the U.S. 
 * Government is subject to restrictions as set forth in Subparagraph 
 * (c)(1)(ii) of DFARS 252.227-7013, or in FAR 52.227-19, as applicable. 
 * 
 ***************************************************************************** 
/* 
    This program creates and maps to a memory resident global section using 
    shared page tables.  The program requires a reserved memory entry 
    (named In_Memory_Database) in the Reserved Memory Registry. 
 
    The entry in the registry is created using SYSMAN as follows: 
 
    $ MCR SYSMAN 
    SYSMAN> RESERVED_MEMORY ADD "In_Memory_Database"/ALLOCATE/PAGE_TABLES - 
        /ZERO/SIZE=64/GROUP=100 
 
    The above command creates an entry named In_Memory_Database that is 
    64 Mbytes in size and requests that the physical memory be allocated 
    during system initialization.  This enables the physcial memory to 
    be mapped with granularity hints by the SYS$CRMPSC_GDZRO_64 system 
    service.  It also requests that physical memory be allocated for 
    page tables for the named entry, requests the allocated memory be 
    zeroed, and requests that UIC group number 100 be associated with 
    the entry. 
 
 
    Once the entry has been created with SYSMAN, the system must be 
    re-tuned with AUTOGEN.  Doing so allows AUTOGEN to re-calculate 
    values for SYSGEN parameters that are sensitive to changes in 
    physical memory sizes.  (Recall that the Reserved Memory Registry 
    takes physical pages away from the system.)  Once AUTOGEN has 
    been run, the system must be rebooted. 
 
 
    Using the following commands to compile and link this program: 
 
    $ CC/POINTER_SIZE=32 shared_page_tables_example 
    $ LINK shared_page_tables_example 
 
    Since 64-bit virtual addresses are used by this program, a Version 
    5.2 DEC C compiler or later is required to compile it. 
*/ 
#define     __NEW_STARLET   1 
 
#include    <DESCRIP>
#include    <FAR_POINTERS>
#include    <GEN64DEF>
#include    <INTS>
#include    <PSLDEF>
#include    <SECDEF>
#include    <SSDEF>
#include    <STARLET>
#include    <STDIO>
#include    <STDLIB>
#include    <STRING>
#include    <VADEF>
 
#define     bad_status(status) (((status) & 1) != 1) 
#define     ONE_MEGABYTE    0x100000 
 
 
main () 
{ 
    int 
        status; 
 
    $DESCRIPTOR (section_name, "In_Memory_Database"); 
 
    uint32 
        region_flags = VA$M_SHARED_PTS,   /* Shared PT region. */ 
        section_flags = SEC$M_EXPREG; 
 
    uint64 
        mapped_length, 
        requested_size = 64*ONE_MEGABYTE, 
        section_length = 64*ONE_MEGABYTE, 
        region_length; 
 
    GENERIC_64 
        region_id; 
 
    VOID_PQ 
        mapped_va, 
        region_start_va; 
 
 
    printf ("Shared Page Table Region Creation Attempt:  Size = %0Ld\n", 
        requested_size); 
 
 
/*  Create a shared page table region. */ 
 
    status = sys$create_region_64 ( 
        requested_size,                 /* Size in bytes of region */ 
        VA$C_REGION_UCREATE_UOWN,       /* Region VA creation and owner mode */ 
        region_flags,                   /* Region Flags:  shared page tables */ 
        &region_id,                     /* Region ID */ 
        &region_start_va,               /* Starting VA for region */ 
        &region_length);                /* Size of created region */ 
 
    if (bad_status (status)) 
    { 
        printf ("ERROR:  Unable to create region of size %16Ld\n\n", 
            requested_size); 
        return; 
    } 
 
    printf ("Shared Page Table Region Created:  VA = %016LX, Size = %0Ld\n\n", 
        region_start_va, 
        region_length); 
 
 
/* Create and map a memory resident section with shared page tables 
       into the shared page table region. */ 
 
    printf ("Create and map to section %s\n", section_name.dsc$a_pointer); 
    status = sys$crmpsc_gdzro_64 ( 
            &section_name,              /* Section name */ 
            0,                          /* Section Ident */ 
            0,                          /* Section protection */ 
            section_length,             /* Length of Section */ 
            &region_id,                 /* RDE */ 
            0,                          /* Section Offset; map entire section */ 
            PSL$C_USER,                 /* Access Mode */ 
            section_flags,              /* Section Creation Flags */ 
            &mapped_va,                 /* Return VA */ 
            &mapped_length);            /* Return Mapped Length */ 
 
    if (bad_status (status)) 
        printf ("ERROR:  Unable to Create and Map Section %s, status = %08x\n\n", 
                section_name.dsc$a_pointer, 
                status); 
    else 
    { 
        printf ("Section %s created, Section Length = %0Ld\n", 
                section_name.dsc$a_pointer, 
                section_length); 
        printf ("    Mapped VA = %016LX, Mapped Length = %0Ld\n\n", 
                mapped_va, 
                mapped_length); 
    } 
 
    /* Delete the shared page table.  This will cause the mapping to the 
       section and the section itself to be deleted. */ 
 
    printf ("Delete the mapping to the memory resident global section"); 
    printf (" and the shared\n    page table region.\n"); 
    status = sys$delete_region_64 ( 
            &region_id, 
            PSL$C_USER, 
            &region_start_va, 
            &region_length); 
 
    if (bad_status (status)) 
        printf ("ERROR:  Unable to delete shared page table region, status = %08x\n\n", status); 
    else 
        printf ("Region Deleted, Start VA = %016LX, Length = %016LX\n\n", 
                region_start_va, 
                region_length); 
    printf ("\n"); 
} 
 

This example program displays the following output:


Shared Page Table Region Creation Attempt:  Size = 67108864 
Shared Page Table Region Created:  VA = FFFFFFFBFC000000, Size = 67108864 
 
Create and map to section In_Memory_Database 
Section In_Memory_Database created, Section Length = 67108864 
    Mapped VA = FFFFFFFBFC000000, Mapped Length = 67108864 
 
Delete the mapping to the memory resident global section and the shared 
    page table region. 
Region Deleted, Start VA = FFFFFFFBFC000000, Length = 0000000004000000 


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