diff options
| author | Michael Sevakis <jethead71@rockbox.org> | 2007-03-19 22:04:17 +0000 |
|---|---|---|
| committer | Michael Sevakis <jethead71@rockbox.org> | 2007-03-19 22:04:17 +0000 |
| commit | e1dd10ddfb49bfdd05fa8997bc097df93a9c9466 (patch) | |
| tree | 0c530ecb1ab68eb335edf595829bf7786e6a683e /firmware/target/arm | |
| parent | fbf52ae8fe04f27368392b71a3572dc2bb00788f (diff) | |
| download | rockbox-e1dd10ddfb49bfdd05fa8997bc097df93a9c9466.tar.gz rockbox-e1dd10ddfb49bfdd05fa8997bc097df93a9c9466.zip | |
SWCODEC: Get rid of extra swap buffer and get back 512K of RAM or 100K if the players RAM is <= 1MB. Make any needed changes to things to stabilize and facilitate this including removing flattening out initialization. Comment some things heavily. Fix a few logfs I didn't want to see the compiler complaining about.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@12843 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'firmware/target/arm')
| -rw-r--r-- | firmware/target/arm/memswap128-arm.S | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/firmware/target/arm/memswap128-arm.S b/firmware/target/arm/memswap128-arm.S new file mode 100644 index 0000000000..f5276ef353 --- /dev/null +++ b/firmware/target/arm/memswap128-arm.S @@ -0,0 +1,44 @@ +/***************************************************************************
+ * __________ __ ___.
+ * Open \______ \ ____ ____ | | _\_ |__ _______ ___
+ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
+ * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
+ * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
+ * \/ \/ \/ \/ \/
+ * $Id$
+ *
+ * Copyright (C) 2007 by Michael Sevakis
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * void memswap128(void *buf1, void *buf2, size_t len)
+ */
+ .section .icode, "ax", %progbits
+ .align 2
+ .global memswap128
+ .type memswap128, %function
+memswap128:
+ @ r0 = buf1
+ @ r1 = buf2
+ @ r2 = len
+ movs r2, r2, lsr #4 @ bytes => lines, len == 0?
+ moveq pc, lr @ not at least a line? leave
+ stmdb sp!, { r4-r10, lr } @ save registers and return address
+.loop: @
+ ldmia r0, { r3-r6 } @ read four longwords from buf1
+ ldmia r1, { r7-r10 } @ read four longwords from buf2
+ stmia r0!, { r7-r10 } @ write buf2 data to buf1, buf1 += 16
+ stmia r1!, { r3-r6 } @ write buf1 data to buf2, buf2 += 16
+ subs r2, r2, #1 @ len -= 1, len > 0 ?
+ bhi .loop @ yes? keep exchanging
+ ldmia sp!, { r4-r10, pc } @ restore registers and return
+.end:
+ .size memswap128, .end-memswap128
+
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