[PATCH] romfs support for Grub2

[y.volta]

Hi,

    I made a small patch for grub2 using  a romfs file ( zip compressing 
support ). there are 3 files added:

-/commands/i386/pc/romfst.c                                 command to mount a 
romfs image file.
-/fs/i386/pc/romfs.c                                                 fs and 
disk layer for romfs.
-/include/grub/i386/pc/romfs.h                                 header file.

usage:    
grub>romfst /romfs.gz
grub>cat (rd)/readme.txt

info
------------------------------------------------------------
i make this patch have two resources: the grub legancy romfs patch and the 
bean's pxe patch. 
i get to know the pxe mod merged the disk&fs into a fs source file. this will 
make mod more simple to implement.
the romfst command will load the specify file to a new memory block. when user 
access (rd), the new files are ready for him.


limitations
------------------------------------------------------------
* this patch is for file only: if you want to use it on a disk/partition, we 
should improve it.
* grub_romfs_data *data, has not set to file->data - i used several global 
varibles to store releated stuffs.


well, this is just a work-able patch, not too professional. ;-)

btw, i think the grub_dprintf should output to non-display device, this will 
make debuging more easier and comfort . i think the low-cost device is a 
com-port. for, now time virtual machine software has this legancy device full 
supported.
the freeldr coming with ReactOS have this kind of function (only display a 
string, but can do kernal debug also )

y.volta

rev_1813.romfs.patch
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