From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001
From: Linus Torvalds <torvalds@ppc970.osdl.org>
Date: Sat, 16 Apr 2005 15:20:36 -0700
Subject: Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
---
 arch/ppc/boot/openfirmware/misc.S | 67 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 arch/ppc/boot/openfirmware/misc.S

(limited to 'arch/ppc/boot/openfirmware/misc.S')

diff --git a/arch/ppc/boot/openfirmware/misc.S b/arch/ppc/boot/openfirmware/misc.S
new file mode 100644
index 00000000000..ab9e897cadd
--- /dev/null
+++ b/arch/ppc/boot/openfirmware/misc.S
@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) Paul Mackerras 1997.
+ *
+ * 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.
+ */
+	.text
+
+/*
+ * Use the BAT2 & 3 registers to map the 1st 16MB of RAM to
+ * the address given as the 1st argument.
+ */
+	.globl	setup_bats
+setup_bats:
+	mfpvr	5
+	rlwinm	5,5,16,16,31		/* r3 = 1 for 601, 4 for 604 */
+	cmpwi	0,5,1
+	li	0,0
+	bne	4f
+	mtibatl	3,0			/* invalidate BAT first */
+	ori	3,3,4			/* set up BAT registers for 601 */
+	li	4,0x7f
+	mtibatu	2,3
+	mtibatl	2,4
+	oris	3,3,0x80
+	oris	4,4,0x80
+	mtibatu	3,3
+	mtibatl	3,4
+	b	5f
+4:	mtdbatu	3,0			/* invalidate BATs first */
+	mtibatu	3,0
+	ori	3,3,0xff		/* set up BAT registers for 604 */
+	li	4,2
+	mtdbatl	2,4
+	mtdbatu	2,3
+	mtibatl	2,4
+	mtibatu	2,3
+	oris	3,3,0x80
+	oris	4,4,0x80
+	mtdbatl	3,4
+	mtdbatu	3,3
+	mtibatl	3,4
+	mtibatu	3,3
+5:	sync
+	isync
+	blr
+
+/*
+ * Flush the dcache and invalidate the icache for a range of addresses.
+ *
+ * flush_cache(addr, len)
+ */
+	.global	flush_cache
+flush_cache:
+	addi	4,4,0x1f	/* len = (len + 0x1f) / 0x20 */
+	rlwinm.	4,4,27,5,31
+	mtctr	4
+	beqlr
+1:	dcbf	0,3
+	icbi	0,3
+	addi	3,3,0x20
+	bdnz	1b
+	sync
+	isync
+	blr
-- 
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