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From:	"philippe meynard" <philippe DOT meynard AT vendeeconcept DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: physical adress of int
Date:	Fri, 10 Sep 2004 17:14:10 +0200
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I don't want the linear address but the physical address of my varaible
see the code i wante used

typedef signed int s32;
s32 str[6], *volatile self_test_results;
PortSeltTest=1;
SCBPort=8;

ioaddr = my base address board ethernet (intel etheexpress),here 0xe400

/* Perform a system self-test. */
  self_test_results = (s32*) ((((long) str) + 15) & ~0xf);
  self_test_results[0] = 0;
  self_test_results[1] = -1;
  outl(VIRT_TO_PHYSADR(self_test_results) | PortSelfTest, ioaddr + SCBPort);
  do {
   udelay(10);
  } while (self_test_results[1] == -1  &&  --boguscnt >= 0);


your solution is not good

an idea
Thanks

"Gisle Vanem" <giva AT bgnett DOT no> a écrit dans le message de news:
04b501c4973c$429a31d0$0600000a AT broadpark DOT no...
> "philippe meynard" wrote:
>
> > I want to know a physical adress of my int variable, it's for my
ethernet
> > board
> > for his initialisation.
>
> First you use DPMI function 6 to get the segment *linear* base
> address. If paging is not in effect, something like this should work:
>
> #define VIRT_TO_LINEAR(addr)  ((unsigned long)(addr) + _virtual_base)
>
> unsigned long _virtual_base = 0;
>  __dpmi_get_segment_base_address (_my_ds(), &_virtual_base);
>
> You can probably use CWSDPR0.EXE to avoid paging.
>
> --gv
>

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