Re: Booting questions ....

From: Willem Jan Withagen (wjw_at_withagen.nl)
Date: 11/05/04

  • Next message: Karim Fodil-Lemelin: "Re: Removing T/TCP and replacing it with something simpler" 
    Date: Fri, 05 Nov 2004 21:34:26 +0100
To: John Baldwin <jhb@freebsd.org>

    John Baldwin wrote:

    [about the loader having flat addressspace....]

    >>But is it unsegmented? (perhaps I have a wrong idea of a flat address
    >>space)
    >
    >
    > Yes, it is unsegmented. You can translate physical addresses to virtual
    > addresses using PTOV() and vice versa using VTOP().

    I've run accross these calls, just need to figure out how to work them.

    >>What I mean with this is that I can iterate from 0xa000 to 0xffffffff with
    >>a "char *p" and do test_bytes( 0xa000, 0xffffffff, 0xff). (assuming this
    >>all has memory)

    > Yes.

    Would be nice....

    >>Next is then which ranges are valid to test, and then things really start
    >>to get complicated and arch dependant. Which is why I ended up in machdep.c
    >>right after the setting up of the memory ranges.
    >
    > Heh, the above memory mapping is also i386 specific. Alpha only has a small
    > bit of memory mapped in the loader, same with sparc64, etc.

    Ehhhh, again more reasons to put this in the kernel, or something that closely
    resembles a kernel.

    --WjW

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  • Next message: Karim Fodil-Lemelin: "Re: Removing T/TCP and replacing it with something simpler"

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