arm/common/mcpm_head.S

3  * arch/arm/common/mcpm_head.S -- kernel entry point for multi-cluster PM
8  * Refer to Documentation/arch/arm/cluster-pm-race-avoidance.rst
28 1903:	.asciz	" cluster"
56 	ubfx	r10, r0, #8, #8			@ r10 = cluster
88 	mla	r8, r0, r10, r8			@ r8 = sync cluster base
96 	@ At this point, the cluster cannot unexpectedly enter the GOING_DOWN
100 	mla	r11, r0, r10, r11		@ r11 = cluster first man lock
106 	bne	mcpm_setup_wait		@ wait for cluster setup if so
109 	cmp	r0, #CLUSTER_UP			@ cluster already up?
110 	bne	mcpm_setup			@ if not, set up the cluster
120 	@ Signal that the cluster is being brought up:
125 	@ Any CPU trying to take the cluster into CLUSTER_GOING_DOWN from this
128 	@ Wait for any previously-pending cluster teardown operations to abort
140 	@ If the outbound gave up before teardown started, skip cluster setup:
145 	@ power_up_setup is now responsible for setting up the cluster:
148 	mov	r0, #1		@ second (cluster) affinity level
157 	@ Leave the cluster setup critical section:
168 	@ In the contended case, non-first men wait here for cluster setup