On Sun, Feb 24, 2013 at 04:00:37PM +0700, Mulyadi Santosa wrote:
On Sat, Feb 23, 2013 at 6:45 AM, horseriver <horserivers@gmail.com> wrote:
hi:
I have built vmlinux at the top dir of kernel source ,then I use objdump to look into its section information.I find the statup_32 which is the start routine of kernel , locats at 0xc0100000. I know the 0x100000 is the defined address for locating protect-mode code .But which I can not understand is the 0xc prefix .where does it come from?
If my guess is right, that's because kernel mode code start at 0xc000000 a.k.a a bit above 3 GiB on x86 32 bit machine
I have find this answer . It is defined in lds script file . here is the code : SECTIONS { . = 0xC0000000 + 0x100000; /* read-only */ _text = .; /* Text and read-only data */ why use 0xC0000000 as its start ? why not just use 0x100000 only ? if use 0xC0000000,every linked symbole will be prefixed by 0xc , what is the purpose ? thanks! --
regards,
Mulyadi Santosa Freelance Linux trainer and consultant
blog: the-hydra.blogspot.com training: mulyaditraining.blogspot.com