[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>
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