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 sundown
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Re: OS4 Memory allocation and progress
Posted on 6-Jul-2006 22:38:29
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Elite Member
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Joined: 30-Aug-2003
Posts: 4616
From: West coast, USA | | |
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| @All
Any known software compatibility problems, especially with older 68k apps that break?
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RWO
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Re: OS4 Memory allocation and progress
Posted on 6-Jul-2006 23:15:15
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Joined: 8-Mar-2003
Posts: 447
From: Denmark | | |
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| @sundown
Yes there is trouble with some of the PPC programs (not 68k) were they dont respect read-only data.
if you for example have a source where the data is set to 'const', that data will be send to a readonly memory location and it will trough a DSI if you try to modify the data.
One program the fails for this is LimpidClock.
edit: I'm were not trying to put LimpidClock in a bad light it was just an example.. I do apologize to the author for using the Nice program as an example.
RWO Last edited by RWO on 07-Jul-2006 at 12:54 PM.
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lylehaze
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Re: OS4 Memory allocation and progress
Posted on 6-Jul-2006 23:41:57
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Cult Member
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Joined: 1-Sep-2004
Posts: 865
From: Virginia, USA | | |
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| @EntilZha
Do developers that are not on the beta list have access to the new
memory system?
I'm developing without it, so I'm wondering if it's something I'm missing, or something I'm not supposed to have yet.
LyleHaze, writing drivers in the dark...
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afxgroup
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Re: OS4 Memory allocation and progress
Posted on 6-Jul-2006 23:45:31
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Joined: 8-Mar-2004
Posts: 1952
From: Taranto, Italy | | |
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wegster
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Re: OS4 Memory allocation and progress
Posted on 7-Jul-2006 0:02:50
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Elite Member
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Joined: 29-Nov-2004
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From: RTP, NC USA | | |
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| @RWO
Quote:
RWO wrote:
@sundown
Yes there is trouble with some of the PPC programs (not 68k) were they dont respect read-only data.
if you for example have a source where the data is set to 'const', that data will be send to a readonly memory location and it will trough a DSI if you try to modify the data.
One program the fails for this is LimpidClock.
RWO |
Hrm, -Wall is your friend 
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lylehaze
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Re: OS4 Memory allocation and progress
Posted on 7-Jul-2006 0:18:42
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Joined: 1-Sep-2004
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From: Virginia, USA | | |
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| @afxgroup
Yes, I am writing a driver.
Sure, I'm having troubles, nothing works perfect on the first try.
May I assume by your comment that I'll have more troubles when the
new memory system is made available?
LyleHaze _________________
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afxgroup
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Re: OS4 Memory allocation and progress
Posted on 7-Jul-2006 0:20:50
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Super Member
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Joined: 8-Mar-2004
Posts: 1952
From: Taranto, Italy | | |
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RWO
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Re: OS4 Memory allocation and progress
Posted on 7-Jul-2006 0:24:16
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Regular Member
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Joined: 8-Mar-2003
Posts: 447
From: Denmark | | |
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| @wegster
Quote:
| Hrm, -Wall is your friend |
Yes I agree.. Looking at the Changelog of OS4 all the Developers have started to use -Wall and -Werror so I followed too, just to be sure.
RWO_________________
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RWO
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Re: OS4 Memory allocation and progress
Posted on 7-Jul-2006 0:29:57
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Joined: 8-Mar-2003
Posts: 447
From: Denmark | | |
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| @lylehaze
Quote:
May I assume by your comment that I'll have more troubles when the
new memory system is made available? |
If you need to support DMA in your driver.. you now have to alloc memory block that isent swappable and you need to translate the memory address to the real psyical address.
That also means all current drivers that use DMA, needs to be updated, from AHI driver to USB and IDE and so on. but that is allready done.
RWO_________________
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Rogue
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Re: OS4 Memory allocation and progress
Posted on 7-Jul-2006 0:30:02
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OS4 Core Developer
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Joined: 14-Jul-2003
Posts: 3999
From: Unknown | | |
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| @lylehaze
Quote:
May I assume by your comment that I'll have more troubles when the
new memory system is made available? |
Well, it's not that big of an issue really. The MEMF_PUBLIC flag is mostly ignored now (or rather converted to MEMF_SHARED) so you will not nescessarily get non-fragmented memory (i.e. the pages may be scattered around). If you don't use MEMF_PUBLIC, it should not make any difference._________________
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lylehaze
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Re: OS4 Memory allocation and progress
Posted on 7-Jul-2006 0:40:05
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Cult Member
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Joined: 1-Sep-2004
Posts: 865
From: Virginia, USA | | |
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| @All
Thanks for the info.
I'll have to look over my existing code to see if anything
might be affected.(CAMD, USB MIDI, new project)
I look forward to getting the full details of how to make
best use of the new allocation scheme.
Patience is a blessing, I'm just not in a hurry for
anything anymore.
Too old, too tired.
LyleHaze
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tonyw
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Re: OS4 Memory allocation and progress
Posted on 7-Jul-2006 3:56:27
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Joined: 8-Mar-2003
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From: Sydney (of course) | | |
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| @wegster
"-Wall" is not enough. Despite the option name ("all"), it does not check everything. You have to add -Wwrite-strings and a few others as well.
The gcc people decided that "all" should mean "almost all".
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tony
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tonyw
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Re: OS4 Memory allocation and progress
Posted on 7-Jul-2006 3:59:19
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Elite Member
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Joined: 8-Mar-2003
Posts: 2780
From: Sydney (of course) | | |
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| @sundown
Legacy programs like 68k stuff are not checked for writes to "read-only" sections. The old "hunk" binary system did not support it properly, IIRC.
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tony
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sundown
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Re: OS4 Memory allocation and progress
Posted on 7-Jul-2006 4:21:54
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Elite Member
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Joined: 30-Aug-2003
Posts: 4616
From: West coast, USA | | |
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| @tonyw
Had a feeling some old programs would break. I'm glad I got e-uae working to support those that don't survive the change. Just hope e-uae survives. _________________
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Samwel
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Re: OS4 Memory allocation and progress
Posted on 7-Jul-2006 4:50:05
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Elite Member
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Joined: 7-Apr-2004
Posts: 3393
From: Sweden | | |
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| @sundown
If not, I guess Mr Drummond will fix it rather quick as he's in the inner circle and
has this information since long ago.
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sundown
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Re: OS4 Memory allocation and progress
Posted on 7-Jul-2006 6:04:41
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Elite Member
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Joined: 30-Aug-2003
Posts: 4616
From: West coast, USA | | |
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| @Samwel
Yes, Richard is a beta tester, so not much to worry about.
I was hoping the beta testers could/would start to give us a warning about the apps that are known to fail. _________________
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