please describe loops_per_jiffy and boot_cpu_data

[bravetanveer]

hi all,

Please can anyone give me information about these things:

Two variable are there about which i want to know

1. loops_per_jiffy present in linux/delay.h

2. boot_cpu_data present in asm/processor.h

If suppose i run a for loop from &loops_per_jiffy to &boot_cpu_data ,
what all things will i get.

Do reply

thanks in advance

[bravetanveer]

As the sys_call_table is no longer exported i.e. not allowed to reference just bye specifying the sys_call_table.

So to find sys_call_table i did a trick.

Though sys_call_table is no longer exported still u can find a entry for it in System.map.
This file stores the address of variable and functions.

So in System.map file if one searches from loops_per_jiffy to boot_cpu_data , one can the address of sys_call_table directly and then play with system calls.

Restoring the pointer of sys_call_table is again a tricky thing which can be tried a hand at.