From owner-freebsd-stable@FreeBSD.ORG  Wed Jun 15 14:32:56 2011
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From: Vlad Galu <dudu@dudu.ro>
Date: Wed, 15 Jun 2011 16:00:55 +0200
Message-ID: <BANLkTikt-zoHLqKEc5a1OAHau7-LESHjwg@mail.gmail.com>
To: Joerg Wunsch <joerg@freebsd.org>
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Subject: Re: doscmd under 8-stable, anyone?
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Hi Joerg,

Flip security.bsd**.map_at_zero to 1.

On Wed, Jun 15, 2011 at 3:57 PM, Joerg Wunsch <
freebsd-stable@uriah.heep.sax.de> wrote:

> When trying to use doscmd on 8-stable, all I get is:
>
> Error mapping HMA, HMA disabled: : Invalid argument
> Segmentation fault (core dumped)
>
> The segfault happens at the end of mem_init(), when the allocated DOS
> memory (which is located at virtual address 0) is attempted to be
> written to.  Apparently, the mmap() failure that causes the "HMA
> disabled" message is actually a fatal error rather than a benign one
> the could be ignored, as it results in no valid DOS memory allocation
> at all.
>
> Right now, the only older system I could test it against uses FreeBSD
> 5.x, where the mmap() works as expected.  So does anyone have an idea
> why this mmap() call:
>
>    if (mmap((caddr_t)0x000000, 0x100000,
>                   PROT_EXEC | PROT_READ | PROT_WRITE,
>                   MAP_ANON | MAP_FIXED | MAP_SHARED,
>                   -1, 0) == MAP_FAILED) {
>        perror("Error mapping HMA, HMA disabled: ");
>        HMA_a20 = -1;
>        close(HMA_fd_off);
>        close(HMA_fd_on);
>        return;
>    }
>
> yields an EINVAL now under 8-stable?
>
> --
> cheers, J"org               .-.-.   --... ...--   -.. .  DL8DTL
>
> http://www.sax.de/~joerg/                        NIC: JW11-RIPE
> Never trust an operating system you don't have sources for. ;-)
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