PERFORCE change 29982 for review

[Juli Mallett]

http://perforce.freebsd.org/chv.cgi?CH=29982

Change 29982 by jmallett at jmallett_dalek on 2003/04/28 15:46:15

	Add mips_idle and mips_wait_idle as variants of mips_maybewait_idle.
	Some of the code is ifXXX and really needs written to work
	with FreeBSD.

Affected files ...

.. //depot/projects/mips/sys/mips/mips/locore_mips3.S#3 edit

Differences ...

==== //depot/projects/mips/sys/mips/mips/locore_mips3.S#3 (text+ko) ====

@@ -94,6 +94,8 @@
 #include <machine/param.h>
 #include <machine/endian.h>
 
+#include "assym.s"
+
 /*
  * XXX We need a cleaner way of handling the instruction hazards of
  * the various processors.  Here are the relevant rules for the QED 52XX:
@@ -354,3 +356,94 @@
  *	saved in trap frames and restores.
  */
 LEAF(mips_cp0_status_write)
+
+LEAF(mips_wait_idle)
+	j	mips_maybewait_idle
+	li	t1, 1
+END(mips_wait_idle)
+
+LEAF(mips_idle)
+	j	mips_maybewait_idle
+	move	t1, zero
+END(mips_idle)
+
+/*
+ * mips_maybewait_idle:
+ *
+ *	When no processes are on the runq, cpu_switch branches to
+ *	idle to wait for something to come ready.
+ *
+ *	NOTE: This is really part of cpu_switch(), but defined here
+ *	for kernel profiling.
+ *
+ *	This version takes advantage of power-saving features on
+ *	the QED RM52xx family of CPUs, and MIPS32 & MIPS64 CPUs,
+ *	if t1 is non-zero.
+ */
+LEAF(mips_maybewait_idle)
+	la	t0, pcpup
+	sd	zero, PC_CURTHREAD(t0)		# set curthread NULL
+#if defined(LOCKDEBUG)
+	jal	sched_unlock_idle	# release sched_lock
+	nop
+#endif
+	li	t0, (MIPS_INT_MASK | MIPS_SR_INT_IE)
+	DYNAMIC_STATUS_MASK(t0,t1)		# machine dependent masking
+	mtc0	t0, MIPS_COP_0_STATUS		# enable all interrupts
+	COP0_SYNC
+	nop
+
+#if XXX
+	/* Try to zero some free pages. */
+	lw	t0, uvm + UVM_PAGE_IDLE_ZERO
+	nop
+	beq	t0, zero, 1f
+	nop
+	jal	uvm_pageidlezero
+	nop
+#endif
+1:
+#ifdef MIPS_DYNAMIC_STATUS_MASK
+	# Do this again since the mask may have changed.
+	li	t3, (MIPS_INT_MASK | MIPS_SR_INT_IE)
+	DYNAMIC_STATUS_MASK(t3,t1)		# machine dependent masking
+	mtc0	t3, MIPS_COP_0_STATUS		# enable all interrupts
+	COP0_SYNC
+	nop
+#endif
+#if XXX
+	lw	t0, sched_whichqs	# look for non-empty queue
+	bne	t0, zero, 1f
+	nop
+#endif
+	beq	t1, zero, 1b
+	nop
+	wait
+	nop
+	nop
+	nop
+	b	1b
+	nop
+1:
+#if defined(LOCKDEBUG)
+	mtc0	zero, MIPS_COP_0_STATUS		# disable all interrupts
+	COP0_SYNC
+	nop
+	nop
+	nop
+	nop
+	jal	_C_LABEL(sched_lock_idle)	# acquire sched_lock
+	nop
+	la	ra, cpu_switch_queuescan
+	j	ra
+	nop
+#else
+	mtc0	zero, MIPS_COP_0_STATUS		# disable all interrupts
+	COP0_SYNC
+	nop
+	nop
+	nop
+	la	ra, cpu_switch_queuescan
+	j	ra
+	nop
+END(mips_maybewait_idle)