id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	field_blocks	field_dependson	field_seealso
659	Get rid of the SYS_SET_TLS syscall	Jakub Jermář	Jakub Jermář	"HelenOS needs the SYS_SET_TLS syscall to support fibril local storage on ia32 and amd64. Recent amd64 processors (starting from Ivy Bridge) support the WRFSBASE instruction for setting the FS base address from any (kernel/user) mode.

HelenOS on amd64 should detect the availability of this instruction and use it instead of the SYS_SET_TLS syscall. This would render the syscall necessary only for ia32 and older amd64 processors. We could get rid of it completely by pretending WRGSBASE/WRFSBASE is always supported (both on ia32 and amd64) and emulate its behaviour upon the #UD exception."	enhancement	closed	major	0.7.0	helenos/kernel/amd64	mainline	fixed	fibrils, tls