On Fri, Jun 15, 2007 at 08:56:00PM +0200, Marco Gerards wrote: > Bean <[EMAIL PROTECTED]> writes: > > > On Fri, Jun 15, 2007 at 08:22:16PM +0200, Marco Gerards wrote: > >> adrian15 <[EMAIL PROTECTED]> writes: > >> > >> > adrian15 escribió: > >> >> 1st) Where to save an array? > >> >> ============================= > >> >> > >> >> If I mimic the grub legacy map command I need to save an array with > >> >> the > >> >> map definitions. > >> >> > >> >> static unsigned short bios_drive_map[DRIVE_MAP_SIZE + 1]; > >> >> So that each time I call something like: > >> >> map (hd0) (hd1) > >> >> it modifies this vector. > >> >> > >> >> Any example on where should I define this vector so that I can use it > >> >> from each command ? > >> > > >> > I ask the question again. > >> > >> What is this vector supposed to do? Do you really need it outside > >> map.c? > >> > >> Can you describe the design of the map command? > > > > I happen to know something about the map command in GRUB Legacy, it works > > by hooking INT 13. > > > > It first reserves a small range of memory from the top of convensional > > memory by decreasing value at 0x413, then copy its INT 13 interrupt handler > > and the drive map to this area. Finally, it modifies the IVT table so that > > INT 13 points to the new handler. > > > > Inside the handler, it uses the drive map to translate the current drive > > stored in %dl to the real drive, then jump to the original handler. > > Right, but the problem Adrian brought up was that he though he needs > to add a vector which describes the mapping as a global. I do not see > why this is required. So I wonder what he had in mind.
Yes, it doesn't need to be a global variable. > > I think the main issue here is how to hook this into GRUB 2 so that > the hook becomes effective just before booting. It can be done in a grub_map_real_boot function in kern/i386/pc/startup.S -- Bean <[EMAIL PROTECTED]> _______________________________________________ Grub-devel mailing list Grub-devel@gnu.org http://lists.gnu.org/mailman/listinfo/grub-devel
