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authorHaavard Skinnemoen <hskinnemoen@atmel.com>2006-10-24 10:12:44 +0200
committerLinus Torvalds <torvalds@g5.osdl.org>2006-10-25 20:26:33 -0700
commitd68041cc9fde550fe6b6a6de1d7a110daff3cb60 (patch)
tree1b712054a6466b7901339ebaba37ce27c7f2b1a0 /arch/avr32/lib/io-writesb.S
parent065834ab3988fece5608088e83724891c8190a2f (diff)
downloadlinux-d68041cc9fde550fe6b6a6de1d7a110daff3cb60.tar.gz
[PATCH] AVR32: Implement and export __raw_{read,write}s[bwl]
Implement __raw_readsb and __raw_writesb. Export __raw_reads[bwl] and __raw_writes[bwl] for use by modules. Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/avr32/lib/io-writesb.S')
-rw-r--r--arch/avr32/lib/io-writesb.S52
1 files changed, 52 insertions, 0 deletions
diff --git a/arch/avr32/lib/io-writesb.S b/arch/avr32/lib/io-writesb.S
new file mode 100644
index 0000000..b4ebaac
--- /dev/null
+++ b/arch/avr32/lib/io-writesb.S
@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2004-2006 Atmel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+ .text
+.Lnot_word_aligned:
+1: ld.ub r8, r11++
+ sub r10, 1
+ st.b r12[0], r8
+ reteq r12
+ tst r11, r9
+ brne 1b
+
+ /* fall through */
+
+ .global __raw_writesb
+ .type __raw_writesb,@function
+__raw_writesb:
+ cp.w r10, 0
+ mov r9, 3
+ reteq r12
+
+ tst r11, r9
+ brne .Lnot_word_aligned
+
+ sub r10, 4
+ brlt 2f
+
+1: ld.w r8, r11++
+ bfextu r9, r8, 24, 8
+ st.b r12[0], r9
+ bfextu r9, r8, 16, 8
+ st.b r12[0], r9
+ bfextu r9, r8, 8, 8
+ st.b r12[0], r9
+ st.b r12[0], r8
+ sub r10, 4
+ brge 1b
+
+2: sub r10, -4
+ reteq r12
+
+3: ld.ub r8, r11++
+ sub r10, 1
+ st.b r12[0], r8
+ brne 3b
+
+ retal r12