Hi... I think it is also a nice URL --> http://www.ews.uiuc.edu/~cjiang/reference/vc311.htm > As explained in this article "sysenter" machine instruction is > sometimes fater that "int 0x80" exception instruction and allows to > enter the machine to kernel mode more quickly, I am just wondering, > how does the CPU gets the base address of system_call function in > kernel (top / first function in kernel to get executed when system > call is done) after the sysenter instruction. In int 0x80 mechanisum > 0x80 is the entry index in IDT and in this entry we have the virtual > address of system_call() function stored, so its not a problem when > we invoke the system call throuh int 0x80 mechanism. well, in sysenter, that system_call() address is set at SYSENTER_EIP_MSR :) regards, Mulyadi -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
