Hi, I guess the attachment did'nt make it thru .. i did'nt read this post before i replied to u'r previous post .. my bad karthik --- Salvatore D'Angelo <dangelo.sasaman@tiscali.it> wrote: > I am not sure you received this mail. I had problems > with my email client. > > > ------------------------------------------------------------------------------------------------------------- > > I wrote 10 simple examples. > To build them: > > make bootsect (to build the bootsector) > make disk (to write it on the floppy) > > Basically these are simplified versions of > bootsector.S of Linus > Torvalds built setp by step from scratch (using the > original code). This > is useful because the people see how the things > works step by step. > > here a brief description > > example1 -> create a simple bootdisk that print > "Hello World" > example2 -> same of example1 only use direct access > to videoram instead > of int 0x10 > example3 -> add to the preovious examples a routine > to dump the > registers (useful for > debugging) > example4 -> first step of the boot process. Copy > bootsector from > 0x7c00:0 to 0x9000:0 > move the program count there > and print "Hello > World" again > example5 -> add kill motor > example6 -> load the setup code using int 0x13 > example7 -> this example can be discarded at the > beginning since the > code added is necessary > to make bootable also 1.2Mb > and 720Kb disks. For > newbies this can be > discarded and use hardcoded > 18 sectors. Infact > the code has been remove in > example8. > example8 -> hardcoded version of exampe7 > example9 -> print "Loading system ..." befor the > loading head.S > example10 -> introduction of head.S and jump from > bootsector.S to head.S > > I am working now on example11 and the read_it > routine (for me it is > complicated, because I am not an assembler expert) I > understand what it > does but some instructions are not clear. > It it in coding phase. > > Now step by step I want understand the code inside > head.S and setup.S > and pass the control to a my c program. > > There is also example100 where I am trying to boot a > simple main.c using > a bootload like lilo. But I do not understand well > how it works. > > Attached the tar gz of my code. > > Ah, to test the code it is necessary make a reboot > of the machine and > start from the floppy. > To avoid this I use bochs (a virtual machine). > > > > -- > Kernelnewbies: Help each other learn about the Linux > kernel. > Archive: > http://mail.nl.linux.org/kernelnewbies/ > FAQ: http://kernelnewbies.org/faq/ > __________________________________ Do you Yahoo!? SBC Yahoo! DSL - Now only $29.95 per month! http://sbc.yahoo.com -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
