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author | Wolfgang Denk <wd@pollux.denx.de> | 2006-10-24 15:17:59 +0200 |
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committer | Wolfgang Denk <wd@pollux.denx.de> | 2006-10-24 15:17:59 +0200 |
commit | 0ab292cbc1add30abb8767ae64ebfaac7504d1f6 (patch) | |
tree | b15987ff48a447084b6f51829cf3994be6710749 /lib_avr32/memset.S | |
parent | d67c14c0f4e390dc7069bbe852f5ec8ea1acc8fc (diff) | |
parent | 9748d5a9e8aa8bf6dd576e70894b9996c22f7003 (diff) | |
download | u-boot-imx-0ab292cbc1add30abb8767ae64ebfaac7504d1f6.zip u-boot-imx-0ab292cbc1add30abb8767ae64ebfaac7504d1f6.tar.gz u-boot-imx-0ab292cbc1add30abb8767ae64ebfaac7504d1f6.tar.bz2 |
Merge with /home/wd/git/u-boot/master
Diffstat (limited to 'lib_avr32/memset.S')
-rw-r--r-- | lib_avr32/memset.S | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/lib_avr32/memset.S b/lib_avr32/memset.S new file mode 100644 index 0000000..dc3b09b --- /dev/null +++ b/lib_avr32/memset.S @@ -0,0 +1,81 @@ +/* + * Copyright (C) 2004-2006 Atmel Corporation + * + * See file CREDITS for list of people who contributed to this + * project. + * + * 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 + */ + + /* + * r12: void *b + * r11: int c + * r10: size_t len + * + * Returns b in r12 + */ + .text + + .global memset + .type memset, @function + .align 2 +memset: + mov r9, r12 + mov r8, r12 + or r11, r11, r11 << 8 + andl r9, 3, COH + brne 1f + +2: or r11, r11, r11 << 16 + sub r10, 4 + brlt 5f + + /* Let's do some real work */ +4: st.w r8++, r11 + sub r10, 4 + brge 4b + + /* + * When we get here, we've got less than 4 bytes to set. r10 + * might be negative. + */ +5: sub r10, -4 + reteq r12 + + /* Fastpath ends here, exactly 32 bytes from memset */ + + /* Handle unaligned count or pointer */ + bld r10, 1 + brcc 6f + st.b r8++, r11 + st.b r8++, r11 + bld r10, 0 + retcc r12 +6: st.b r8++, r11 + mov pc, lr + + /* Handle unaligned pointer */ +1: sub r10, 4 + brlt 5b + add r10, r9 + lsl r9, 1 + add pc, r9 + st.b r8++, r11 + st.b r8++, r11 + st.b r8++, r11 + rjmp 2b + + .size memset, . - memset |