From 3d21003ba1534507e8bfc041be782c59b31ca15e Mon Sep 17 00:00:00 2001
From: gonzo <gonzo@FreeBSD.org>
Date: Fri, 6 Jan 2012 01:23:26 +0000
Subject: - Add better COP2 (crypto coprocessor) context handler for Octeon.
 Keep     COP2 disabled and lazily allocate COP2 context structure in
 exception     handler. Keep kernel and userland contexts separated.

---
 sys/mips/mips/swtch.S | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)

(limited to 'sys/mips/mips/swtch.S')

diff --git a/sys/mips/mips/swtch.S b/sys/mips/mips/swtch.S
index 699c206..8b285dd 100644
--- a/sys/mips/mips/swtch.S
+++ b/sys/mips/mips/swtch.S
@@ -250,6 +250,61 @@ NON_LEAF(cpu_switch, CALLFRAME_SIZ, ra)
 getpc:
 	SAVE_U_PCB_CONTEXT(ra, PREG_PC, a0)		# save return address
 
+#ifdef CPU_CNMIPS
+
+	lw	t2, TD_MDFLAGS(a3)		# get md_flags
+	and	t1, t2, MDTD_COP2USED
+	beqz	t1, cop2_untouched
+	nop
+
+	/* Clear cop2used flag */
+	and	t2, t2, ~MDTD_COP2USED
+	sw	t2, TD_MDFLAGS(a3)
+
+	and	t2, t0, ~MIPS_SR_COP_2_BIT	# clear COP_2 enable bit
+	SAVE_U_PCB_CONTEXT(t2, PREG_SR, a0)	# save status register
+
+	RESTORE_U_PCB_REG(t0, PS, a0)		# get CPU status register
+	and	t2, t0, ~MIPS_SR_COP_2_BIT	# clear COP_2 enable bit
+	SAVE_U_PCB_REG(t2, PS, a0)		# save stratus register
+
+	/* preserve a0..a3 */
+	move	s0, a0
+	move	s1, a1
+	move	s2, a2
+	move	s3, a3
+
+	/* does kernel own COP2 context? */
+	lw	t1, TD_COP2OWNER(a3)		# get md_cop2owner
+	beqz	t1, userland_cop2		# 0 - it's userland context
+	nop
+
+	PTR_L	a0, TD_COP2(a3)
+	beqz	a0, no_cop2_context
+	nop
+
+	j	do_cop2_save
+	nop
+
+userland_cop2:
+
+	PTR_L	a0, TD_UCOP2(a3)
+	beqz	a0, no_cop2_context
+	nop
+
+do_cop2_save:
+	jal	octeon_cop2_save
+	nop
+
+no_cop2_context:
+	move	a3, s3
+	move	a2, s2
+	move	a1, s1
+	move	a0, s0
+
+cop2_untouched:
+#endif
+
 	PTR_S	a2, TD_LOCK(a3)			# Switchout td_lock 
 
 mips_sw1:
-- 
cgit v1.1