Init Sequence

[subvand]

Hi guys,

I am understanding the linux start up sequence and stuck at the following:
start_kernel() -> rest_init() -> kernel_init() -> do_basic_setup() -> do_initcalls()

As per my understanding, we are initializing all the subsystems in do_initcalls():
for (fn = __early_initcall_end; fn < __initcall_end; fn++)
do_one_initcall(*fn);
I could not find the definition of function pointers __early_initcall_end and __initcall_end.

Please help me by stating where are these funciton pointer definitions.

Thanks in advance!!

Regards,
Mandava

[Rubberman]

Search the kernel code tree?

[subvand]

I searched the symbols using Source Insight.. could not find.
Only clue I got is in vmlinux.lds.h
#define INITCALLS \
*(.initcallearly.init) \
VMLINUX_SYMBOL(__early_initcall_end) = .; \
*(.initcall0.init) \
*(.initcall0s.init) \
*(.initcall1.init) \
*(.initcall1s.init) \
*(.initcall2.init) \
*(.initcall2s.init) \
*(.initcall3.init) \
*(.initcall3s.init) \
*(.initcall4.init) \
*(.initcall4s.init) \
*(.initcall5.init) \
*(.initcall5s.init) \
*(.initcallrootfs.init) \
*(.initcall6.init) \
*(.initcall6s.init) \
*(.initcall7.init) \
*(.initcall7s.init)

Later how it is mapping to all subsystem init calls is the doubt.

From trace32 debugging, I could find that all subsystem init funciton pointers are in between __early_initcall_end and __initcall_end. Ex: bt_init(), bluetooth_power_init() etc.. etc...

But I would like to know how it is implemented in the code.