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From: | "philippe meynard" <philippe DOT meynard AT vendeeconcept DOT com> |
Newsgroups: | comp.os.msdos.djgpp |
Subject: | Re: Accessing absolute address above 1MB |
Date: | Wed, 8 Nov 2006 10:02:52 +0100 |
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References: | <1162915098 DOT 476438 DOT 52420 AT k70g2000cwa DOT googlegroups DOT com> <4550adea DOT sandmann AT clio DOT rice DOT edu> <1162922909 DOT 133028 DOT 98340 AT f16g2000cwb DOT googlegroups DOT com> |
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To map a physical device to linear memory you must do : _dpmi_meminfo info; ADDR=your physical adresse of device here 0x3FF00000; info.address=ADDR; info.size=size access of device (exemple frame buffer video 8 Mb) if(__dpmi_physical_adress_mapping(&info)==-1){ printf("Physical mapping of address 0x%x failed!\n",(unsigned int)ADDR); } ADDR1=ADDR+ __djgpp_conventionnal_base; //is the virtual adress to access device exemple: *ADDR1=15; //a white pixel on screen "James" <countingtoten AT gmail DOT com> a écrit dans le message de news: 1162922909 DOT 133028 DOT 98340 AT f16g2000cwb DOT googlegroups DOT com... >I tried that and still receive the same error message. > > Charles Sandmann wrote: >> > I am trying to access the memory address 0x3FFF0000 in DOS using dpmi. >> .. >> > buffer[0] = _farpeekb(selector, mi.address); >> >> mi.address should be 0 here, since the offset is built into the selector >> you just set up >
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