NO, IDTR contains the virtual address of IDT, it also contains the length of IDT in number of bytes. Cheers !! Gaurav -----Original Message----- From: Thekkedath, Gopakumar [mailto:Gopakumar.Thekkedath@xxxxxxx] Sent: Friday, October 01, 2004 9:32 AM To: Dhiman, Gaurav; Ashish Mishra Cc: Kenel Newbies Subject: RE: Seek Help !!! (about getting a pointer to sys_call_table) >1. - get the pointer to IDT (Interrupt Descriptor Table), using SIDT >assembly instruction. This instruction will store the value of IDTR >register of processor, which actually is a pointer to IDT in kernel. >2. - Once you get the pointer to IDT, get to the 128th entry of IDT by >multiplying 128 with 8 (as each entry in IDT is of 8 bytes) and adding >that to the IDT pointer, which we got in first step. This is a pointer >to the system gate through with system calls enter kernel mode. Just a thought, the IDTR holds the physical address of the IDT in memory right? so to use that in the kernel, u may have to convert it to virtual address. gop -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
