Re: Extboot Option ROM rewritten in C - v3

[Anthony Liguori <aliguori@us.ibm.com>]

Nguyen Anh Quynh wrote:
> On Thu, Apr 17, 2008 at 3:00 PM, H. Peter Anvin <hpa@zytor.com> wrote:
>   
>>> +       .globl linux_boot
>>> +linux_boot:
>>> +       cli
>>> +       cld
>>> +       mov $0x9000, %ax
>>> +       mov %ax, %ds
>>> +       mov %ax, %es
>>> +       mov %ax, %fs
>>> +       mov %ax, %gs
>>> +       mov %ax, %ss
>>> +       mov $0x8ffe, %sp
>>> +       ljmp $0x9000 + 0x20, $0
>>>
>>>       
>>  The hard use of segment 9000 is really highly unfortunate for bzImage,
>> since it restricts its heap more than necessary.  I suggest following the
>> patterns used by the (new) Qemu loader.
>>     
>
> Actually, this code is left from the original code of Anthony, and it
> seems he took it from qemu 0.8 version.
>
> Anthony, may you explain why you want to hijact the linux boot process
> here? If I understand correctly, we can just let the original int19
> execute, and if linux boot is desired, it would work in normal way. So
> why you want to do this?
>   

The thinking is to eliminate the need to hijack the boot sector when 
using the -kernel option.  However, the linux boot stuff in extboot has 
been broken since hpa rewrote the boot code.  It can be removed for now 
and I'll eventually revisit it.

Regards,

Anthony Liguori

> Thanks,
> Q
>   


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