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Re: [PATCH] reserve end-of-conventional-memory to 1MB on 32-bit v2

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From: Alexander van Heukelum
Subject: Re: [PATCH] reserve end-of-conventional-memory to 1MB on 32-bit v2
Date: Tuesday, March 4, 2008 - 9:51 am

On Tue, 04 Mar 2008 07:18:48 -0800, "Jeremy Fitzhardinge"
<jeremy@goop.org> said:

Hi,

If it exists, it is well-hidden. A grep for is_paravirt on the testing
tree turns up nothing. Did you get the name right?


I chose to code it exactly this way, because it is what is used in
head_32.S to choose how to start the kernel. Or is this code not
executed at all?

[excerpt form head_32.S]
        cmpw $0x207, pa(boot_params + BP_version)
        jb default_entry

        /* Paravirt-compatible boot parameters.  Look to see what
        architecture
                we're booting under. */
        movl pa(boot_params + BP_hardware_subarch), %eax
        cmpl $num_subarch_entries, %eax
        jae bad_subarch

        movl pa(subarch_entries)(,%eax,4), %eax
        subl $__PAGE_OFFSET, %eax
        jmp *%eax
[and]
subarch_entries:
        .long default_entry             /* normal x86/PC */
        .long lguest_entry              /* lguest hypervisor */
        .long xen_entry                 /* Xen hypervisor */
num_subarch_entries = (. - subarch_entries) / 4
[end]

If this is indeed not executed, is there a way to detect whether
we can expect the environment to behave like a normal pc in terms
of magic addresses, bios areas, isa reserved address space and so
on?

Greetings,
    Alexander
-- 
  Alexander van Heukelum
  heukelum@fastmail.fm

-- 
http://www.fastmail.fm - mmm... Fastmail...

--
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Messages in current thread:
[PATCH] Fix alignment of early reservation for EBDA, Alexander van Heukelum, (Sun Feb 24, 10:46 am)
Re: [PATCH] Fix alignment of early reservation for EBDA, Andi Kleen, (Sun Feb 24, 12:27 pm)
Re: [PATCH] Fix alignment of early reservation for EBDA, Ingo Molnar, (Sun Feb 24, 12:41 pm)
Re: [PATCH] Fix alignment of early reservation for EBDA, Alexander van Heukelum, (Sun Feb 24, 1:53 pm)
Re: [PATCH] Fix alignment of early reservation for EBDA, H. Peter Anvin, (Sun Feb 24, 7:18 pm)
Re: [PATCH] Fix alignment of early reservation for EBDA, Alexander van Heukelum, (Mon Feb 25, 9:54 am)
Re: [PATCH] Fix alignment of early reservation for EBDA, Ingo Molnar, (Mon Feb 25, 10:01 am)
[PATCH] reserve_early end-of-conventional-memory to 1MB, Alexander van Heukelum, (Mon Feb 25, 11:07 am)
Re: [PATCH] reserve_early end-of-conventional-memory to 1MB, H. Peter Anvin, (Mon Feb 25, 11:13 am)
Re: [PATCH] reserve_early end-of-conventional-memory to 1MB, Alexander van Heukelum, (Mon Feb 25, 12:46 pm)
Re: [PATCH] reserve_early end-of-conventional-memory to 1MB, H. Peter Anvin, (Mon Feb 25, 2:17 pm)
Re: [PATCH] reserve_early end-of-conventional-memory to 1MB, Ingo Molnar, (Tue Feb 26, 2:30 am)
Re: [PATCH] Fix alignment of early reservation for EBDA, Andi Kleen, (Wed Feb 27, 7:25 am)
Re: [PATCH] reserve_early end-of-conventional-memory to 1MB, Andi Kleen, (Wed Feb 27, 7:26 am)
Re: [PATCH] reserve_early end-of-conventional-memory to 1M ..., Andi Kleen, (Wed Feb 27, 7:38 am)
Re: [PATCH] reserve_early end-of-conventional-memory to 1M ..., H. Peter Anvin, (Wed Feb 27, 9:44 am)
Re: [PATCH] reserve_early end-of-conventional-memory to 1M ..., Alexander van Heukelum, (Wed Feb 27, 1:01 pm)
[PATCH] reserve end-of-conventional-memory to 1MB on 32-bit, Alexander van Heukelum, (Thu Feb 28, 6:13 am)
[RFC] use realmode code to reserve end-of-conventional-mem ..., Alexander van Heukelum, (Thu Feb 28, 6:28 am)
Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Ian Campbell, (Thu Feb 28, 2:09 pm)
Re: [RFC] use realmode code to reserve end-of-conventional ..., Ian Campbell, (Thu Feb 28, 2:12 pm)
Re: [RFC] use realmode code to reserve end-of-conventional ..., H. Peter Anvin, (Thu Feb 28, 2:14 pm)
Re: [RFC] use realmode code to reserve end-of-conventional ..., Ian Campbell, (Thu Feb 28, 4:16 pm)
Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Alexander van Heukelum, (Fri Feb 29, 4:49 am)
Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Mark McLoughlin, (Fri Feb 29, 10:14 am)
Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Alexander van Heukelum, (Fri Feb 29, 11:38 am)
Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., H. Peter Anvin, (Fri Feb 29, 11:44 am)
Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Alexander van Heukelum, (Fri Feb 29, 11:56 am)
Re: [RFC] use realmode code to reserve end-of-conventional ..., Ingo Molnar, (Fri Feb 29, 1:00 pm)
Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Mark McLoughlin, (Fri Feb 29, 3:06 pm)
Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Alexander van Heukelum, (Fri Feb 29, 3:26 pm)
Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Alexander van Heukelum, (Sat Mar 1, 9:09 am)
Re: [PATCH] reserve end-of-conventional-memory to 1MB on 6 ..., Alexander van Heukelum, (Sat Mar 1, 9:12 am)
Re: [RFC] use realmode code to reserve end-of-conventional ..., Mark McLoughlin, (Tue Mar 4, 4:41 am)
Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Mark McLoughlin, (Tue Mar 4, 4:44 am)
Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Alexander van Heukelum, (Tue Mar 4, 6:31 am)
Re: [RFC] use realmode code to reserve end-of-conventional ..., Ingo Molnar, (Tue Mar 4, 7:33 am)
Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Ingo Molnar, (Tue Mar 4, 7:49 am)
Re: [RFC] use realmode code to reserve end-of-conventional ..., Ian Campbell, (Tue Mar 4, 8:12 am)
Re: [RFC] use realmode code to reserve end-of-conventional ..., Jeremy Fitzhardinge, (Tue Mar 4, 8:13 am)
Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Mark McLoughlin, (Tue Mar 4, 8:16 am)
Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Jeremy Fitzhardinge, (Tue Mar 4, 8:18 am)
Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Ingo Molnar, (Tue Mar 4, 8:24 am)
Re: [RFC] use realmode code to reserve end-of-conventional ..., Ingo Molnar, (Tue Mar 4, 8:25 am)
Re: [RFC] use realmode code to reserve end-of-conventional ..., Jeremy Fitzhardinge, (Tue Mar 4, 9:02 am)
Re: [RFC] use realmode code to reserve end-of-conventional ..., Ingo Molnar, (Tue Mar 4, 9:15 am)
Re: [RFC] use realmode code to reserve end-of-conventional ..., Mark McLoughlin, (Tue Mar 4, 9:15 am)
Re: [RFC] use realmode code to reserve end-of-conventional ..., Ingo Molnar, (Tue Mar 4, 9:23 am)
Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Alexander van Heukelum, (Tue Mar 4, 9:51 am)
Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., H. Peter Anvin, (Tue Mar 4, 10:05 am)
Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Jeremy Fitzhardinge, (Tue Mar 4, 10:11 am)
Re: [RFC] use realmode code to reserve end-of-conventional ..., Jeremy Fitzhardinge, (Tue Mar 4, 10:44 am)
Re: [PATCH] reserve end-of-conventional-memory to 1MB, 32- ..., Alexander van Heukelum, (Tue Mar 4, 11:57 am)
Re: [PATCH] reserve end-of-conventional-memory to 1MB, 64- ..., Alexander van Heukelum, (Tue Mar 4, 12:12 pm)
Re: [RFC] use realmode code to reserve end-of-conventional ..., Eduardo Habkost, (Wed Mar 5, 8:59 am)
Re: [RFC] use realmode code to reserve end-of-conventional ..., H. Peter Anvin, (Wed Mar 5, 9:08 am)
Re: [RFC] use realmode code to reserve end-of-conventional ..., Jeremy Fitzhardinge, (Wed Mar 5, 9:38 am)
Re: [RFC] use realmode code to reserve end-of-conventional ..., Eduardo Habkost, (Wed Mar 5, 9:53 am)
Re: [RFC] use realmode code to reserve end-of-conventional ..., H. Peter Anvin, (Wed Mar 5, 10:27 am)
Re: [RFC] use realmode code to reserve end-of-conventional ..., Jeremy Fitzhardinge, (Wed Mar 5, 10:28 am)
Re: [RFC] use realmode code to reserve end-of-conventional ..., H. Peter Anvin, (Wed Mar 5, 10:28 am)
Re: [RFC] use realmode code to reserve end-of-conventional ..., H. Peter Anvin, (Wed Mar 5, 10:38 am)