Eric Auer schrieb: > Hi! > >> - I would like to read the whole RAM (mainly only 32 bit - 2 GB, but 4 >> GB or even more in 64 bit are also interesting) and write it into a raw >> image (also called sometimes flat or .img). > > The BIOS int 15.87 lets you access the first 4 GB, if you > want to access more than that, you have to do fancy stuff, > typically forcing you to do the work in assembly language.
I think basically I would need to switch the processor into long mode. Is this supported by DOS? There is no DOS extender for this? Well, to access more then 4 GB there would be need for an updated DOS extender. > > > You cannot modify HIMEMX for that easily: 36 bit addressing > is not so exotic, but if you lock a handle, it must get an > address inside the first 4 GB because of API limitations... > > The highest physical addr is also limited to 4 GB, while the > total amount of available XMS can be up to 4 TB. Each handle > can access at most 4 GB, still enough :-). > > > You can modify JEMM386, though, as EMM386 never tells you > the actual address of your data (in original EMS hardware, > it did not even have one, only the page frame window had). > Each handle can refer to up to 256 MB of RAM in EMS API. > > However, a modified JEMM386 would no longer be compatible > with any old DOS extender because the VCPI interface only > works with at most 4 GB address range and 4 kB phys pages. > > > If you modify HIMEMX to allow using > 4 GB RAM, as long > as max 4 GB per handle are used, and take the risk that > locking a handle can be slow (need move to first 4 GB if > you are unlucky) you still break EMM386 compatibilities. > > > PS: Any chances that JEMM386 will support int 2f func 4a15, > "install I/O virtualization handler" (MS EMM386 extension) > which would allow creating *virtual hardware* for FreeDOS? > Only few MS DOS drivers use it. Might be easier than JLM? > By the way, can JLMs support virtual DMA and IRQ creation? I don't know why you are talking about the memory manager stuff? The goal was simply to store the whole RAM into a file. At no point I was talking about using 4 GB in legacy applications and/or legacy application compatibility. > > >> - Also interesting for disk cloning, reading a whole drive and storing >> it as a raw image. > > http://www.heise.de/software/ > http://freshmeat.net/ > ... > > Of course, instead of reading through 50 freshmeat matches > or 15 Heise matches for "disk image" to find which ones work > in DOS (Tom's software and FreeDOS are among the results), > you can also use a Linux boot CD/DVD/USB and use your dd ;-) > I am almost sure Heise HAS a disk clone tool for DOS, though! There are some but dd as command line tool is nicer in some cases. -mr ------------------------------------------------------------------------------ Create and Deploy Rich Internet Apps outside the browser with Adobe(R)AIR(TM) software. With Adobe AIR, Ajax developers can use existing skills and code to build responsive, highly engaging applications that combine the power of local resources and data with the reach of the web. Download the Adobe AIR SDK and Ajax docs to start building applications today-http://p.sf.net/sfu/adobe-com _______________________________________________ Freedos-user mailing list Freedos-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-user
