Mailing List Archive: Cleanup, shuffle and boot

Cleanup, shuffle and boot

Apr 23, 2007, 5:36 AM

Post #1 of 5 (1181 views)

Hi,

I am trying to use the syslinux API call, ax=0012h in order to boot a
linux kernel image that has been loaded into RAM.

1) Has anyone used this function to boot linux?
2) The shuffle source/destination address is a linear 32 bit address?
3) Is it safe to move the 32 bit kernel code to 100000h using the
shuffle moves or is syslinux using that area?
4) What areas of memory are used by syslinux and a com32 program?

This is what I am doing:

1) Load the linux real mode code to 1000:0
2) Load the linux protected mode code to 200000h
3) Load the initrd image to 800000h
4) Set various entries in the linux real mode data and command line
5) Set shuffle descriptors to move the protected mode code to 100000h.
6) Call syslinux api with ax=0012 etc
Machine hangs at this point or else reboots.

Thanks,
Andrew

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Re: Cleanup, shuffle and boot [ In reply to ]

hpa at zytor

Apr 23, 2007, 9:04 AM

Post #2 of 5 (1140 views)

Permalink

Andrew Goodbody wrote:
> Hi,
>
> I am trying to use the syslinux API call, ax=0012h in order to boot a
> linux kernel image that has been loaded into RAM.
>
> 1) Has anyone used this function to boot linux?
> 2) The shuffle source/destination address is a linear 32 bit address?
> 3) Is it safe to move the 32 bit kernel code to 100000h using the
> shuffle moves or is syslinux using that area?
> 4) What areas of memory are used by syslinux and a com32 program?

Hi there,

I found a pretty serious bug in cleanup, shuffle and boot while working
on the new version (3.50).

The 3.50-pre* versions contains an fixed version, plus a wrapper
function to boot Linux with. The wrapper function also takes care of
additional shuffles that might be needed due to address space conflicts.

-hpa

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Re: Cleanup, shuffle and boot [ In reply to ]

agoodbody at itronix

Apr 23, 2007, 9:20 AM

Post #3 of 5 (1138 views)

Permalink

H. Peter Anvin wrote:
> Andrew Goodbody wrote:
>> Hi,
>>
>> I am trying to use the syslinux API call, ax=0012h in order to boot a
>> linux kernel image that has been loaded into RAM.
>>
>> 1) Has anyone used this function to boot linux?
>> 2) The shuffle source/destination address is a linear 32 bit address?
>> 3) Is it safe to move the 32 bit kernel code to 100000h using the
>> shuffle moves or is syslinux using that area?
>> 4) What areas of memory are used by syslinux and a com32 program?
>
> Hi there,
>
> I found a pretty serious bug in cleanup, shuffle and boot while working
> on the new version (3.50).
>
> The 3.50-pre* versions contains an fixed version, plus a wrapper
> function to boot Linux with. The wrapper function also takes care of
> additional shuffles that might be needed due to address space conflicts.
>
> -hpa

I should have mentioned that I am using this tarball
http://www.kernel.org/pub/linux/utils/boot/syslinux/Testing/syslinux-3.50-pre5.tar.bz2
I still can't get git access from here but I am sure that it is a local
IT issue.
Is the wrapper function you mention documented anywhere?

Thanks,
Andrew

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Re: Cleanup, shuffle and boot [ In reply to ]

hpa at zytor

Apr 23, 2007, 9:33 AM

Post #4 of 5 (1140 views)

Permalink

Andrew Goodbody wrote:
>
> I should have mentioned that I am using this tarball
> http://www.kernel.org/pub/linux/utils/boot/syslinux/Testing/syslinux-3.50-pre5.tar.bz2
>
> I still can't get git access from here but I am sure that it is a local
> IT issue.
> Is the wrapper function you mention documented anywhere?
>

See com32/modules/linux.c for a usage example.

-hpa

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Re: Cleanup, shuffle and boot [ In reply to ]

agoodbody at itronix

Apr 23, 2007, 10:12 AM

Post #5 of 5 (1143 views)

Permalink

H. Peter Anvin wrote:
> Andrew Goodbody wrote:
>>
>> I should have mentioned that I am using this tarball
>> http://www.kernel.org/pub/linux/utils/boot/syslinux/Testing/syslinux-3.50-pre5.tar.bz2
>>
>> I still can't get git access from here but I am sure that it is a
>> local IT issue.
>> Is the wrapper function you mention documented anywhere?
>>
>
> See com32/modules/linux.c for a usage example.
>
> -hpa

Thanks, that is what I needed. I can now start the kernel booting at least.

Andrew

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