[ros-dev] multiboot.S patch in need of review, please

Royce Mitchell III royce3 at ev1.net
Thu Jan 27 18:37:50 CET 2005

Hartmut Birr wrote:

> Hartmut Birr schrieb:
>> I've add your patch to my source tree. On the smp machine, ros 
>> reboots in the very early boot phase. It is before the call to _main.
>> - Hartmut
> Hi,
> I've found the problem. MmSystemRangeStart is initialized before the 
> bss section is cleaned. But MmSystemRangeStart is located in the bss 
> section. There are two other little mistakes. The offset of 
> MmSystemRangeStart isn't calculated correctly. Royce has reported this 
> in an other mail. On UP machines MmSystemRangeStart is not 
> initialized. Look at the attached file.

Since multiboot loader is supposed to zero bss for us, the simplest 
solution was to disable the bss zeroing code.

I also found a bug in MmSystemRangeStart was being set at all for UP builds.

It's getting much farther along now when trying to boot. It prints some 
of the normal ReactOS startup text, but then bugchecks on something, not 
sure what because the screen gets garbled for some reason.

It still won't fully work yet anyway for at least these two reasons:

1) can't seem to find options string in memory. I know what strings are 
in my freeldr.ini, and they're just not showing up on the commandline 
when I step through the code in bochs.

2) ntoskrnl's _main() still needs to reloc itself before it does 
*anything* else. Otherwise /3GB will bomb.

-------------- next part --------------
A non-text attachment was scrubbed...
Name: multiboot.zip
Type: application/x-zip-compressed
Size: 2107 bytes
Desc: not available
Url : http://reactos.com:8080/pipermail/ros-dev/attachments/20050127/95576026/multiboot.bin

More information about the Ros-dev mailing list