www.delorie.com/archives/browse.cgi | search |
X-Authentication-Warning: | delorie.com: mail set sender to djgpp-bounces using -f |
X-Received: | by 10.107.6.232 with SMTP id f101mr6707917ioi.30.1503080023306; |
Fri, 18 Aug 2017 11:13:43 -0700 (PDT) | |
X-Received: | by 10.31.136.77 with SMTP id k74mr65135vkd.4.1503080023248; Fri, |
18 Aug 2017 11:13:43 -0700 (PDT) | |
Newsgroups: | comp.os.msdos.djgpp |
Date: | Fri, 18 Aug 2017 11:13:42 -0700 (PDT) |
In-Reply-To: | <on6k51$1a8k$1@gioia.aioe.org> |
Complaints-To: | groups-abuse AT google DOT com |
Injection-Info: | glegroupsg2000goo.googlegroups.com; posting-host=89.24.106.115; |
posting-account=Q0wMHAoAAADjYrghh94FTf6YnbpTqZgp | |
NNTP-Posting-Host: | 89.24.106.115 |
References: | <db10bd5c-9132-4be5-a496-757e648bf99a AT googlegroups DOT com> <on6k51$1a8k$1 AT gioia DOT aioe DOT org> |
User-Agent: | G2/1.0 |
MIME-Version: | 1.0 |
Message-ID: | <2fd7d93e-3a52-47ef-97d4-dc0208565e62@googlegroups.com> |
Subject: | Re: Can I use transferbuffer temporarly a for short DMA transfer? |
From: | "RayeR (glaux AT centrum DOT cz) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com> |
Injection-Date: | Fri, 18 Aug 2017 18:13:43 +0000 |
Bytes: | 2045 |
Lines: | 12 |
To: | djgpp AT delorie DOT com |
DJ-Gateway: | from newsgroup comp.os.msdos.djgpp |
X-MIME-Autoconverted: | from quoted-printable to 8bit by delorie.com id v7IIU2op030289 |
Reply-To: | djgpp AT delorie DOT com |
Errors-To: | nobody AT delorie DOT com |
X-Mailing-List: | djgpp AT delorie DOT com |
X-Unsubscribes-To: | listserv AT delorie DOT com |
> "[The transfer] buffer is used for all DOS/BIOS services supported by > DJGPP, it resides in conventional memory, and is allocated by the > startup code." > http://www.delorie.com/djgpp/v2faq/faq18_2.html Yes I read the DJGPP FAQ. I'm not sure what all DOS/BIOS serviuces are used by what DJGPP libc function. It seems that printf is destrying my transferbuffer data so I rather use __dpmi_allocate_dos_memory. OK, there's no specified how this allocated memory is aligned and if the allocator prevents crossing 64kB boundary which is required by busmaster DMA - probably I have to take care myself and allocate 2-times of memory than I need and check the physical address and if it cross the boundary then dont use beginning of the buffer but higher address just behind the boundary...
webmaster | delorie software privacy |
Copyright © 2019 by DJ Delorie | Updated Jul 2019 |