Article ID: 321628
Article Last Modified on 5/27/2005
APPLIES TO
- Microsoft Windows CE Platform Builder 4.0
This article was previously published under Q321628
SUMMARY
This article describes a new function, VirtualSetAttributes, that permits you to modify processor-specific page attribute bits for a range of virtual memory. The update that is provided is conditionally supported, and you have to clean and build the platform after you install the update. A sample of code describes the new system function. This article also describes the parameters and the return values of the new function.
INTRODUCTION
You cannot modify processor-specific page attribute bits. No functionality exists for you to do this.
However, the means to modify processor-specific page attribute bits is useful for optimizing memory access on some microprocessors. This article implements a new function so that you can modify processor-specific page attribute bits. The new VirtualSetAttributes function permits you to change the per-page attributes for a range of virtual memory.
RESOLUTION
Hotfix information
A supported software update is now available from Microsoft as Windows CE 4.0 Core OS QFE 321628. To resolve this problem immediately, click the following article number for information about obtaining Windows CE Platform Builder and core operating system software updates:
837392 How to locate core operating system fixes for Microsoft Windows CE Platform Builder products
Prerequisites
This fix is supported only when all previously issued fixes for this product have also been installed.
Restart requirement
After you install this update, you must perform a clean build of the whole platform. To clean the platform, click Clean on the Build menu. To build the platform, click Build Platform on the Build menu.
Hotfix replacement information
This fix does not replace any other fixes.
File information
The English version of this package has the file attributes (or later) that are listed in the following table.
Date Time Version Size File name --------------------------------------------------------------------------------- 17-May-2002 23:05 4.0.2.517 2,816,344 020517_armv4i_wce40-q321628.exe 17-May-2002 23:05 4.0.2.517 2,808,152 020517_armv4t_wce40-q321628.exe 17-May-2002 23:05 4.0.2.517 2,812,248 020517_armv4_wce40-q321628.exe 17-May-2002 23:05 4.0.2.517 2,779,480 020517_mips16_wce40-q321628.exe 17-May-2002 23:05 4.0.2.517 3,012,952 020517_mipsii_fp_wce40-q321628.exe 17-May-2002 23:05 4.0.2.517 4,938,072 020517_mipsii_wce40-q321628.exe 17-May-2002 23:05 4.0.2.517 3,144,024 020517_mipsiv_fp_wce40-q321628.exe 17-May-2002 23:05 4.0.2.517 3,017,048 020517_mipsiv_wce40-q321628.exe 17-May-2002 23:05 4.0.2.517 2,627,928 020517_sh3_wce40-q321628.exe 17-May-2002 23:05 4.0.2.517 2,656,600 020517_sh4_wce40-q321628.exe 17-May-2002 23:05 4.0.2.517 2,419,032 020517_x86_wce40-q321628.exe
The English version of this hotfix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.
Date Time Size File name -------------------------------------------------------------- Path: Public\Common\Oak\Inc 24-Apr-2002 18:27 39,647 Mkfuncs.h 24-Apr-2002 18:29 33,027 Pkfuncs.h 24-Apr-2002 18:31 12,199 Psyscall.h Path: Public\Common\Oak\Lib\Armv4\Debug 25-Apr-2002 00:03 67,606 Coredll.def 25-Apr-2002 00:03 151,182 Coremain.lib 25-Apr-2002 00:06 1,742,536 Nkmain.lib 25-Apr-2002 00:06 1,853,284 Nkprmain.lib 25-Apr-2002 00:03 710,294 Thunks.lib Path: Public\Common\Oak\Lib\Armv4\Retail 25-Apr-2002 00:00 67,590 Coredll.def 25-Apr-2002 00:01 140,678 Coremain.lib 25-Apr-2002 00:05 1,115,290 Nkmain.lib 25-Apr-2002 00:06 1,207,294 Nkprmain.lib 25-Apr-2002 00:00 847,528 Thunks.lib Path: Public\Common\Oak\Lib\Armv4i\Debug 25-Apr-2002 00:16 67,606 Coredll.def 25-Apr-2002 00:16 151,660 Coremain.lib 25-Apr-2002 00:19 1,746,460 Nkmain.lib 25-Apr-2002 00:19 1,857,458 Nkprmain.lib 25-Apr-2002 00:16 713,972 Thunks.lib Path: Public\Common\Oak\Lib\Armv4i\Retail 25-Apr-2002 00:13 67,590 Coredll.def 25-Apr-2002 00:13 141,150 Coremain.lib 25-Apr-2002 00:18 1,119,286 Nkmain.lib 25-Apr-2002 00:18 1,211,568 Nkprmain.lib 25-Apr-2002 00:13 851,180 Thunks.lib Path: Public\Common\Oak\Lib\Armv4t\Debug 25-Apr-2002 00:09 67,606 Coredll.def 25-Apr-2002 00:09 142,678 Coremain.lib 25-Apr-2002 00:13 1,615,588 Nkmain.lib 25-Apr-2002 00:13 1,719,424 Nkprmain.lib 25-Apr-2002 00:09 693,048 Thunks.lib Path: Public\Common\Oak\Lib\Armv4t\Retail 25-Apr-2002 00:07 67,590 Coredll.def 25-Apr-2002 00:07 140,134 Coremain.lib 25-Apr-2002 00:12 1,102,470 Nkmain.lib 25-Apr-2002 00:12 1,193,196 Nkprmain.lib 25-Apr-2002 00:07 865,826 Thunks.lib Path: Public\Common\Oak\Lib\Mips16\Debug 25-Apr-2002 00:35 67,664 Coredll.def 25-Apr-2002 00:35 158,888 Coremain.lib 25-Apr-2002 00:38 1,788,330 Nkmain.lib 25-Apr-2002 00:38 1,909,818 Nkprmain.lib 25-Apr-2002 00:35 770,656 Thunks.lib Path: Public\Common\Oak\Lib\Mips16\Retail 25-Apr-2002 00:33 67,648 Coredll.def 25-Apr-2002 00:33 123,024 Coremain.lib 25-Apr-2002 00:37 997,176 Nkmain.lib 25-Apr-2002 00:37 1,093,560 Nkprmain.lib 25-Apr-2002 00:33 710,806 Thunks.lib Path: Public\Common\Oak\Lib\Mipsii\Debug 25-Apr-2002 00:22 67,664 Coredll.def 25-Apr-2002 00:22 158,888 Coremain.lib 25-Apr-2002 00:26 1,784,476 Nkmipsiibmain.lib 25-Apr-2002 00:25 1,786,156 Nkmipsiimain.lib 25-Apr-2002 00:26 1,906,152 Nkprofmipsiibmain.lib 25-Apr-2002 00:25 1,907,832 Nkprofmipsiimain.lib 25-Apr-2002 00:22 770,656 Thunks.lib Path: Public\Common\Oak\Lib\Mipsii\Retail 25-Apr-2002 00:20 67,648 Coredll.def 25-Apr-2002 00:20 141,568 Coremain.lib 25-Apr-2002 00:24 1,134,776 Nkmipsiibmain.lib 25-Apr-2002 00:24 1,136,626 Nkmipsiimain.lib 25-Apr-2002 00:25 1,237,502 Nkprofmipsiibmain.lib 25-Apr-2002 00:24 1,239,354 Nkprofmipsiimain.lib 25-Apr-2002 00:20 913,726 Thunks.lib Path: Public\Common\Oak\Lib\MipsII_fp\Debug 25-Apr-2002 00:41 67,251 Coredll.def 25-Apr-2002 00:41 158,946 Coremain.lib 25-Apr-2002 00:44 1,854,296 Nkmain.lib 25-Apr-2002 00:44 1,975,988 Nkprmain.lib 25-Apr-2002 00:41 770,872 Thunks.lib Path: Public\Common\Oak\Lib\MipsII_fp\Retail 25-Apr-2002 00:39 67,235 Coredll.def 25-Apr-2002 00:39 141,656 Coremain.lib 25-Apr-2002 00:43 1,196,228 Nkmain.lib 25-Apr-2002 00:44 1,299,062 Nkprmain.lib 25-Apr-2002 00:39 913,952 Thunks.lib Path: Public\Common\Oak\Lib\Mipsiv\Debug 25-Apr-2002 00:29 67,664 Coredll.def 25-Apr-2002 00:29 164,150 Coremain.lib 25-Apr-2002 00:32 1,843,406 Nkmain.lib 25-Apr-2002 00:32 1,967,930 Nkprmain.lib 25-Apr-2002 00:29 788,460 Thunks.lib Path: Public\Common\Oak\Lib\Mipsiv\Retail 25-Apr-2002 00:26 67,648 Coredll.def 25-Apr-2002 00:27 148,070 Coremain.lib 25-Apr-2002 00:31 1,192,464 Nkmain.lib 25-Apr-2002 00:32 1,298,586 Nkprmain.lib 25-Apr-2002 00:26 931,976 Thunks.lib Path: Public\Common\Oak\Lib\Mipsiv_fp\Debug 25-Apr-2002 00:47 67,251 Coredll.def 25-Apr-2002 00:47 164,210 Coremain.lib 25-Apr-2002 00:50 1,919,272 Nkmain.lib 25-Apr-2002 00:51 2,043,818 Nkprmain.lib 25-Apr-2002 00:47 788,676 Thunks.lib Path: Public\Common\Oak\Lib\Mipsiv_fp\Retail 25-Apr-2002 00:45 67,235 Coredll.def 25-Apr-2002 00:45 148,156 Coremain.lib 25-Apr-2002 00:50 1,260,660 Nkmain.lib 25-Apr-2002 00:50 1,366,836 Nkprmain.lib 25-Apr-2002 00:45 932,200 Thunks.lib Path: Public\Common\Oak\Lib\Sh3\Debug 24-Apr-2002 23:50 68,929 Coredll.def 24-Apr-2002 23:50 133,210 Coremain.lib 24-Apr-2002 23:53 1,449,758 Nkmain.lib 24-Apr-2002 23:53 1,547,906 Nkprmain.lib 24-Apr-2002 23:50 663,420 Thunks.lib Path: Public\Common\Oak\Lib\Sh3\Retail 24-Apr-2002 23:47 68,913 Coredll.def 24-Apr-2002 23:48 126,420 Coremain.lib 24-Apr-2002 23:53 973,800 Nkmain.lib 24-Apr-2002 23:53 1,064,474 Nkprmain.lib 24-Apr-2002 23:47 820,868 Thunks.lib Path: Public\Common\Oak\Lib\Sh4\Debug 24-Apr-2002 23:56 69,019 Coredll.def 24-Apr-2002 23:57 132,960 Coremain.lib 25-Apr-2002 00:00 1,468,028 Nkmain.lib 25-Apr-2002 00:00 1,566,186 Nkprmain.lib 24-Apr-2002 23:56 665,590 Thunks.lib Path: Public\Common\Oak\Lib\Sh4\Retail 24-Apr-2002 23:54 69,003 Coredll.def 24-Apr-2002 23:54 126,038 Coremain.lib 24-Apr-2002 23:59 991,098 Nkmain.lib 24-Apr-2002 23:59 1,081,834 Nkprmain.lib 24-Apr-2002 23:54 823,352 Thunks.lib Path: Public\Common\Oak\Lib\X86\Debug 24-Apr-2002 23:44 66,926 Coredll.def 24-Apr-2002 23:44 118,672 Coremain.lib 24-Apr-2002 23:47 1,477,356 Nkmain.lib 24-Apr-2002 23:47 1,575,238 Nkprmain.lib 24-Apr-2002 23:44 513,618 Thunks.lib Path: Public\Common\Oak\Lib\X86\Retail 24-Apr-2002 23:42 66,910 Coredll.def 24-Apr-2002 23:42 112,216 Coremain.lib 24-Apr-2002 23:46 953,534 Nkmain.lib 24-Apr-2002 23:46 1,037,066 Nkprmain.lib 24-Apr-2002 23:42 688,006 Thunks.lib
The VirtualSetAttributes function
This hotfix implements a new function, VirtualSetAttributes. This new function permits driver developers to change the per-page attributes for a range of virtual memory. The range of virtual memory is typically copied from a physical location that is not known to the kernel.
This function is currently useful only on the XScale microprocessor, where you can use the function to speed up the display buffer. The following code describes the new system function that is exposed by this update:
BOOL VirtualSetAttributes( LPVOID lpvAddress, DWORD cbSize, DWORD dwNewFlags, DWORD dwMask, LPDWORD lpdwOldFlags );
Parameters of the VirtualSetAttributes function
The VirtualSetAttributes function uses the following parameters:
- lpvAddress
This parameter is the start address of the virtual memory whose attributes are to be changed.
- cbSize
This parameter is the length, in bytes, of the virtual memory whose attributes are to be changed.
- dwNewFlags
This parameter specifies the new value of the bits that are to be set.
- dwMask
This parameter specifies the specific bits that are to be changed. See additional remarks later in this section.
- lpdwOldFlags
If this parameter is not NULL, the *lpdwOldFlags parameter will contain the original value of the page entry of the first page upon return.
Return values of the VirtualSetAttributes function
- Returns TRUE if the function succeeded.
- Returns FALSE if the function failed.
Remarks
The dwMask parameter specifies the specific bits that are to be changed. For example, if the original is as follows, the new value will be 0x00100030:
- value=0x00100010
- dwMask=0x30
- dwNewFlags=0x030
The new value is calculated by using the following formula:
newValue = (oldValue & ~dwMask)|(dwNewFlags & dwMask);
If the dwMask parameter is 0, the parameter behaves in a manner that is similar to a query function. That is, nothing is changed, and the original page entry is returned through the lpdwOldFlags parameter.
Note Microsoft highly recommends that you do not change the actual physical page number. The actual physical page numbers are bits 10 through 31 for most CPUs. If you change the physical page numbers, you may experience unexpected system behavior.
Keywords: kbinfo kbbug kbfix kbqfe KB321628
