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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
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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 */