id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	field_blocks	field_dependson	field_seealso
136	Autodetect support for SYSENTER on ia32	Jakub Jermář		"As of now, HelenOS will not boot if SYSENTER is not supported by the processor. (This is currently preventing us to run on VirtualBox).

The kernel supports both the SYSENTER and INT syscall mechanisms, as well as libc, there just need to be some minor changes done:

- the kernel needs to initialize the SYSENTER MSR's only if it detects that the CPU supports SYSENTER using the CPUID instruction
- the libc needs to detect whether SYSENTER is supported, again using the CPUID instruction, and setup the syscall mechanism for the ""fast"" syscall path accordingly; this can be done by using some sort of a function pointer or code patching"	defect	closed	major	0.4.2	helenos/kernel/ia32	mainline	fixed