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bcm64: provide idlehands() function

--- a/sys/src/9/bcm64/l.s

+++ b/sys/src/9/bcm64/l.s

@@ -291,6 +291,14 @@

 	MSR	R0, DAIF

 	RETURN

+TEXT idlehands(SB), 1, $-4

+	DMB	$ISH

+	MOVW	nrdy(SB), R0

+	CBNZ	R0, _ready

+	WFI

+_ready:

+	RETURN

+

 TEXT cycles(SB), 1, $-4

 TEXT lcycles(SB), 1, $-4

 	MRS	PMCCNTR_EL0, R0

--- a/sys/src/9/bcm64/main.c

+++ b/sys/src/9/bcm64/main.c

@@ -260,11 +260,6 @@

 }

 void

-idlehands(void)

-{

-}

-

-void

 main(void)

 {

 	machinit();