Hi, This may have nothing to do with your questions, but shouldn't there be a 'cld' statement before the 'rep movsb'?
Ivan... On 2 Jan 2003, sivakumar wrote: > Hi, > > I want to understand the flow of the following piece fo the code. It is > for copying the Linuxbios image from Flash ROM to RAM. > > Here I want to what is the value of the _liseg, _iseg, _eliseg segment > address. Can any one explain the following code. > > My system hangs in this part of code (i.e. at rep and movsb instruction. > As per the Ron's SUGGESTION I also used spd to get the value for RAM > intialization. > > But still it loop at this point > > jz .Lnocopy > movl $EXT(_eliseg), %ecx > CONSOLE_DEBUG_TX_HEX32(%ecx) > subl %esi, %ecx > jz .Lnocopy /* should not happen */ > rep > movsb > CONSOLE_DEBUG_TX_STRING($siva_debug5) > .Lnocopy: > > > Thanks, > Siva.S > > > /* > * Copy data into RAM and clear the BSS. Since these > segments > * isn\'t really that big we just copy/clear using bytes, > not > * double words. > */ > CONSOLE_DEBUG_TX_STRING($siva_debug1) > intel_chip_post_macro(0x11) /* post 11 */ > > cld /* clear direction flag */ > > /* copy linuxBIOS from it's initial load location to > * the location it is compiled to run at. > * Normally this is copying from FLASH ROM to RAM. > */ > leal EXT(_liseg), %esi > leal EXT(_iseg), %edi > cmpl %esi, %edi > jz .Lnocopy > movl $EXT(_eliseg), %ecx > CONSOLE_DEBUG_TX_HEX32(%ecx) > subl %esi, %ecx > jz .Lnocopy /* should not happen */ > rep > movsb > CONSOLE_DEBUG_TX_STRING($siva_debug5) > .Lnocopy: > CONSOLE_DEBUG_TX_STRING($siva_debug6) > intel_chip_post_macro(0x12) /* post 12 */ > > /** clear stack */ > leal EXT(_stack), %edi > movl $EXT(_estack), %ecx > subl %edi, %ecx > xorl %eax, %eax > rep > stosb > > /** clear bss */ > leal EXT(_bss), %edi > movl $EXT(_ebss), %ecx > subl %edi, %ecx > jz .Lnobss > xorl %eax, %eax > rep > stosb > > > > -- ---------------------------------------------------------------------- Ivan Pulleyn Sixfold Technologies, LLC Chicago Technology Park 2201 West Campbell Drive Chicago, IL 60612 email: [EMAIL PROTECTED] voice: (866) 324-5460 x601 fax: (312) 421-0388 ---------------------------------------------------------------------- _______________________________________________ Linuxbios mailing list [EMAIL PROTECTED] http://www.clustermatic.org/mailman/listinfo/linuxbios
