Hi Ron,
In ipl.S the machine code "e8 01 00" (is a short call) can execute because
in real mode.
In start32.inc the same machine code "e8 01 00" can't execute because in
protected mode, I find in protected mode, CPU always fetch 4 bytes as offset
after machine code "e8". So I must back to real mode before invoke vga bios, but
then CPU still fetch 4 bytes as offset like in protected mode. I think maybe my
code about back real mode is wrong. Can you give me some advice?
BTW, if CPU can execute "e8 01 00" correctly in protected mode?
Regards,
Collins
my code:
movl %cr0, %eax /*exit protected mode*/
andb $0xfe, %al
movl %eax, %cr0
ljmp $0x8000, $realcc
/* jmp realccc */
realcc:
