Commit 7cc86dee authored by Sven Schnelle's avatar Sven Schnelle Committed by Vasily Gorbik
Browse files

s390/entry: Make __switch_to() ready for lowcore relocation 



In preparation of having lowcore at different address than zero,
add the base register to all lowcore accesses in __switch_to().

Reviewed-by: default avatarHeiko Carstens <hca@linux.ibm.com>
Signed-off-by: default avatarSven Schnelle <svens@linux.ibm.com>
Signed-off-by: default avatarVasily Gorbik <gor@linux.ibm.com>
parent 4064b711

arch/s390/kernel/entry.S

+5 −4
Original line number Diff line number Diff line
@@ -169,13 +169,14 @@ SYM_FUNC_START(__switch_to_asm) 
	stg	%r15,__THREAD_ksp(%r1,%r2)	# store kernel stack of prev

	lg	%r15,0(%r4,%r3)			# start of kernel stack of next

	agr	%r15,%r5			# end of kernel stack of next

	stg	%r3,__LC_CURRENT		# store task struct of next

	stg	%r15,__LC_KERNEL_STACK		# store end of kernel stack

	GET_LC	%r13

	stg	%r3,__LC_CURRENT(%r13)		# store task struct of next

	stg	%r15,__LC_KERNEL_STACK(%r13)	# store end of kernel stack

	lg	%r15,__THREAD_ksp(%r1,%r3)	# load kernel stack of next

	aghi	%r3,__TASK_pid

	mvc	__LC_CURRENT_PID(4,%r0),0(%r3)	# store pid of next

	mvc	__LC_CURRENT_PID(4,%r13),0(%r3)	# store pid of next

	ALTERNATIVE "nop", "lpp _LPP_OFFSET(%r13)", ALT_FACILITY(40)

	lmg	%r6,%r15,__SF_GPRS(%r15)	# load gprs of next task

	ALTERNATIVE "nop", "lpp _LPP_OFFSET", ALT_FACILITY(40)

	BR_EX	%r14

SYM_FUNC_END(__switch_to_asm)