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From: | Honiewelle <honiewelle AT gmail DOT com> |
Newsgroups: | comp.os.msdos.djgpp |
Subject: | Flat memory access |
Date: | Wed, 4 Jun 2008 04:04:54 -0700 (PDT) |
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To: | djgpp AT delorie DOT com |
DJ-Gateway: | from newsgroup comp.os.msdos.djgpp |
Reply-To: | djgpp AT delorie DOT com |
Hi, Is the following code snippet for accessing memory addresses correct? I read the djgpp faqs until I came up with this code. I am trying to access a memory space i/o of a PCI device but I am not getting the correct values. Any help would be greatly appreciated. Thanks in advance! /* code starts here */ #include <stdio.h> #include <pc.h> #include <dpmi.h> #include <sys/farptr.h> #include <go32.h> int main (void) { FILE *fp; __dpmi_meminfo mi; int selector; int ctr; mi.address = (0xEC080000); // PCI Base Address register mi.size = 1024; __dpmi_physical_address_mapping (&mi); selector = __dpmi_allocate_ldt_descriptors (1); __dpmi_set_segment_base_address (selector, mi.address); __dpmi_set_segment_limit (selector, mi.size - 1); fp=fopen("bar5.txt","wb"); for (ctr=1;ctr<=1024;ctr++) { value = _farpeekb(_dos_ds, ctr-1); putc(value,fp); } fclose(fp); return 0; } /* code ends here */
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