Mail Archives: djgpp/1998/11/14/08:44:42
| From: | ao777 AT my-dejanews DOT com
|
| Newsgroups: | comp.os.msdos.djgpp
|
| Subject: | How can access memory under 1 MB(BIOS information) under 95/98/NT?
|
| Date: | Sat, 14 Nov 1998 13:26:15 GMT
|
| Organization: | Deja News - The Leader in Internet Discussion
|
| Lines: | 103
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| Message-ID: | <72k0dn$83h$1@nnrp1.dejanews.com>
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| References: | <363D8E66 DOT CD0DDE3D AT gmx DOT de>
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| X-Article-Creation-Date: | Sat Nov 14 08:56:52 1998 GMT
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| To: | djgpp AT delorie DOT com
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| DJ-Gateway: | from newsgroup comp.os.msdos.djgpp
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| Reply-To: | djgpp AT delorie DOT com
|
In article <363D8E66 DOT CD0DDE3D AT gmx DOT de>,
djgpp AT delorie DOT com wrote:
>
> --------------FC45C735E917CFD8ADAB54AF
> Content-Type: text/plain; charset=us-ascii
> Content-Transfer-Encoding: 7bit
>
> 1st.
> How can I get the offset of a variable or a function ?
>
> offset=&variable;
> offset=function or offset=&function
>
> Is this right ?
> 2nd.
> How can I get the size of a function ?
> (with sizeof ????)
> 3rd.
> Why do I have to lock the memory when I want to access a linear address
> ? I mean when this space is swaped to disk and I want to access it with
> a selector and an offset, doesn't the dpmi-server reload it from disk
> automaticly ?
> 4th.
> When I want to copy memory-blocks in the space above 1 MB (in
> assembler), is this the same procedure like in real-mode with the
> difference that I have to store the selectors in the registers where I
> had to store the segments in the real-mode before ?
> 5th.
> Can I have direct access to memory in the space above1 MB without using
> the FAT DS method ?
> 6th.
> Can I have direct access to memory in the space under 1 MB without
> using the FAT DS method ?
> 7th.
> When I map linear memory, what does it mean ? Does it mean that I can
> access this memory-space without a selector because this space is now in
> the available address space of my program ? That would mean that the
> offset of the varaibles and functions to the memory-space descripted by
> the discriptor is changed !!!!
> Or does it mean that I only get a selector to access it ?
> 8th.
> How can I get the physical address when I have a selector and an offset
> (this memory-space is not swaped to disk) ?
> 9th.
> Do the memory-copy-routines - for the protected-mode in Djgpp- move 4
> bytes at one time ?
>
> --------------FC45C735E917CFD8ADAB54AF
> Content-Type: text/html; charset=us-ascii
> Content-Transfer-Encoding: 7bit
>
> <HTML>
> <B>1st.</B>
> <BR>How can I get the offset of a variable or a function ?
>
> <P>
offset=&variable;
> <BR>
> offset=function <B>or </B>offset=&function
>
> <P>Is this right ?
> <BR><B>2nd.</B>
> <BR>How can I get the size of a function ?
> <BR>(with <B>sizeof</B> ????)
> <BR><B>3rd</B>.
> <BR>Why do I have to lock the memory when I want to access a linear address
> ? I mean when this space is swaped to disk and I want to access it with
> a selector and an offset, doesn't the dpmi-server reload it from disk
automaticly
> ?
> <BR><B>4th.</B>
> <BR>When I want to copy memory-blocks in the space above 1 MB (in assembler),
> is this the same procedure like in real-mode with the difference that I
> have to store the selectors in the registers where I had to store the segments
> in the real-mode before ?
> <BR><B>5th.</B>
> <BR>Can I have direct access to memory in the space above1 MB without
> using the FAT DS method ?
> <BR><B>6th.</B>
> <BR>Can I have direct access to memory in the space under 1 MB without
> using the FAT DS method ?
> <BR><B>7th.</B>
> <BR>When I map linear memory, what does it mean ? Does it mean that I can
> access this memory-space without a selector because this space is now in
> the available address space of my program ? That would mean that the offset
> of the varaibles and functions to the memory-space descripted by
> the discriptor is changed !!!!
> <BR>Or does it mean that I only get a selector to access it ?
> <BR><B>8th.</B>
> <BR>How can I get the physical address when I have a selector and an offset
> (this memory-space is not swaped to disk) ?
> <BR><B>9th.</B>
> <BR>Do the memory-copy-routines - for the <B>protected-mode</B> in Djgpp-
> move 4 bytes at one time ?
> <BR> </HTML>
>
> --------------FC45C735E917CFD8ADAB54AF--
>
>
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