1 files changed, 77 insertions, 0 deletions

diff --git a/firmware/target/arm/bits-armv4.S b/firmware/target/arm/bits-armv4.S
new file mode 100644
index 0000000000..05d61b8b7e
--- /dev/null
+++ b/firmware/target/arm/bits-armv4.S
@@ -0,0 +1,77 @@
+/***************************************************************************
+*             __________               __   ___.
+*   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+*   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+*   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+*   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+*                     \/            \/     \/    \/            \/
+* $Id$
+*
+* Copyright (C) 2010 by Michael Sevakis
+*
+* 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+* KIND, either express or implied.
+*
+****************************************************************************/
+
+/***************************************************************************
+ * void bitmod32(volatile uint32_t *addr, uint32_t bits, uint32_t mask)
+ */
+    .section    .text, "ax", %progbits
+    .align      2
+    .global     bitmod32
+    .type       bitmod32, %function
+bitmod32:
+    mrs    r12, cpsr
+    orr    r3, r12, #0xc0
+    msr    cpsr_c, r3
+    ldr    r3, [r0]
+    and    r1, r1, r2               @ Only allow mod of bits in 'mask'
+    bic    r3, r3, r2               @ Clear mask bits
+    orr    r3, r3, r1               @ Set according to 'bits'
+    str    r3, [r0]
+    msr    cpsr_c, r12
+    bx     lr
+    .size  bitmod32, .-bitmod32
+
+/***************************************************************************
+ * void bitset32(volatile uint32_t *addr, uint32_t mask)
+ */
+    .section    .text, "ax", %progbits
+    .align      2
+    .global     bitset32
+    .type       bitset32, %function
+bitset32:
+    mrs    r12, cpsr
+    orr    r2, r12, #0xc0
+    msr    cpsr_c, r2
+    ldr    r2, [r0]
+    orr    r2, r2, r1
+    str    r2, [r0]
+    msr    cpsr_c, r12
+    bx     lr
+    .size  bitset32, .-bitset32
+
+
+/***************************************************************************
+ * void bitclr32(volatile uint32_t *addr, uint32_t mask)
+ */
+     .section    .text, "ax", %progbits
+     .align      2
+     .global     bitclr32
+     .type       bitclr32, %function
+bitclr32:
+    mrs    r12, cpsr
+    orr    r2, r12, #0xc0
+    msr    cpsr_c, r2
+    ldr    r2, [r0]
+    bic    r2, r2, r1
+    str    r2, [r0]
+    msr    cpsr_c, r12
+    bx     lr
+    .size  bitclr32, .-bitclr32