/* * 31-bit switch cpu code * * Copyright IBM Corp. 2009 * */ #include <linux/linkage.h>#include <asm/asm-offsets.h>#include <asm/ptrace.h> # smp_switch_to_cpu switches to destination cpu and executes the passed function# Parameter: %r2 - function to call#	     %r3 - function parameter#	     %r4 - stack poiner#	     %r5 - current cpu#	     %r6 - destination cpu 	.section .textENTRY(smp_switch_to_cpu)	stm	%r6,%r15,__SF_GPRS(%r15)	lr	%r1,%r15	ahi	%r15,-STACK_FRAME_OVERHEAD	st	%r1,__SF_BACKCHAIN(%r15)	basr	%r13,00:	la	%r1,.gprregs_addr-0b(%r13)	l	%r1,0(%r1)	stm	%r0,%r15,0(%r1)1:	sigp	%r0,%r6,__SIGP_RESTART	/* start destination CPU */	brc	2,1b			/* busy, try again */2:	sigp	%r0,%r5,__SIGP_STOP	/* stop current CPU */	brc	2,2b			/* busy, try again */3:	j	3b ENTRY(smp_restart_cpu)	basr	%r13,00:	la	%r1,.gprregs_addr-0b(%r13)	l	%r1,0(%r1)	lm	%r0,%r15,0(%r1)1:	sigp	%r0,%r5,__SIGP_SENSE	/* Wait for calling CPU */	brc	10,1b			/* busy, accepted (status 0), running */	tmll	%r0,0x40		/* Test if calling CPU is stopped */	jz	1b	ltr	%r4,%r4			/* New stack ? */	jz	1f	lr	%r15,%r41:	lr	%r14,%r2		/* r14: Function to call */	lr	%r2,%r3			/* r2 : Parameter for function*/	basr	%r14,%r14		/* Call function */ .gprregs_addr:	.long	.gprregs 	.section .data,"aw",@progbits.gprregs:	.rept	16	.long	0	.endr