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| NNTP-Posting-Date: | Tue, 18 Aug 2009 22:52:52 -0500 |
| From: | "Charles Sandmann" <cwsdpmi AT earthlink DOT net> |
| Newsgroups: | comp.os.msdos.djgpp |
| References: | <ddc847db-306e-496a-999a-34c0542c7a9b AT g31g2000yqc DOT googlegroups DOT com> <G5OdnX1ixc6NZhTXnZ2dnUVZ_oednZ2d AT earthlink DOT com> <af14bd7c-f2ed-4d59-bac8-59c374604d9e AT a37g2000prf DOT googlegroups DOT com> <EpOdncb3wIEF7xbXnZ2dnUVZ_hudnZ2d AT earthlink DOT com> |
| Subject: | Re: freedos and cwsdpmi with djgpp under Linux? |
| Date: | Tue, 18 Aug 2009 22:52:42 -0500 |
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| To: | djgpp AT delorie DOT com |
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>> Allocated 8M DMA buffer at DJGPP address 0x93b00, physical 0x113b00 >> Virtual: 0x1000 Physical: 0x100000 Size: 0x13000 >> Virtual: 0x91000 Physical: 0x916000 Size: 0x1000 >> Virtual: 0x92000 Physical: 0x914000 Size: 0x1000 >> Virtual: 0x93000 Physical: 0x113000 Size: 0x1000 >> Virtual: 0x94000 Physical: 0x115000 Size: 0x7ff000 >> Virtual: 0x893000 Physical: 0x114000 Size: 0x1000 >> Virtual: 0x897000 Physical: 0x915000 Size: 0x1000 >> >> Looking at the Physical address, it's apparent that they are not >> contiguous. If I used XMS would I get a contiguous one? Wait a second here ... Note the text allocated 8MB buffer @ 93b00 The rest of the virtual/physical descriptions are for most of the rest of your image (0x13000 at start of memory, some stack at 0x916000, expanding down, some malloc increase at 0x113000). So expecting that you want 4KB aligned memory, allocating 8MB, then rounding up to nearest 4MB page 0x94000 - you get 4MB - 4KB of buffer to play with. (the other strangeness in memory layout has to deal with sbrk setting boundaries around the memory block). So it appears you have the 1MB buffer you need here.
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