patch-2.4.22 linux-2.4.22/arch/mips64/mm/cex-sb1.S

• Lines: 84
• Date: 2003-08-25 04:44:40.000000000 -0700
• Orig file: linux-2.4.21/arch/mips64/mm/cex-sb1.S
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.21/arch/mips64/mm/cex-sb1.S linux-2.4.22/arch/mips64/mm/cex-sb1.S
@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2001,2002,2003 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+#include <linux/config.h>
+#include <linux/init.h>
+
+#include <asm/asm.h>
+#include <asm/regdef.h>
+#include <asm/mipsregs.h>
+#include <asm/stackframe.h>
+#include <asm/sibyte/board.h>
+
+	.text
+	.set	noat
+	.set	mips4
+
+        __INIT
+        
+	/* Cache Error handler for SB1 */
+	LEAF(except_vec2_sb1)
+	mfc0	k1, $26
+	# check if error was recoverable
+	bltz	k1, leave_cerr
+#ifdef CONFIG_SB1_PASS_1_WORKAROUNDS
+	# look for signature of spurious CErr
+	lui	k0, 0x4000
+	bne	k0, k1, 1f
+	.word	0x401Bd801			# mfc0	k1, $27, 1
+	lui	k0, 0xffe0
+	and	k1, k0, k1
+	lui	k0, 0x0200
+	beq	k0, k1, leave_cerr
+1:
+#endif
+	j	handle_vec2_sb1
+
+leave_cerr:
+	# clear/unlock the registers
+	mtc0	zero, $26
+	mtc0	zero, $27
+	.word	0x4080d801			# mtc0	zero, $27, 1
+	.word	0x4080d803			# mtc0	zero, $27, 3
+	eret
+	END(except_vec2_sb1)
+
+	__FINIT
+
+	LEAF(handle_vec2_sb1)
+	mfc0	k0,CP0_CONFIG
+	li	k1,~CONF_CM_CMASK
+	and	k0,k0,k1
+	ori	k0,k0,CONF_CM_UNCACHED
+	mtc0	k0,CP0_CONFIG
+
+	SSNOP
+	SSNOP
+	SSNOP
+	SSNOP
+	bnezl	$0, 1f
+1:
+	mfc0	k0, CP0_STATUS
+	sll	k0, k0, 3			# check CU0 (kernel?)
+	bltz	k0, 2f
+	get_saved_sp
+	move	sp, k1				# want Kseg SP (so uncached)
+2:
+	j	sb1_cache_error
+
+	END(handle_vec2_sb1)