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[Qemu-devel] [PATCH v6 17/24] qemu/bitops.h: add the bit ordering revers
From: |
Kuo-Jung Su |
Subject: |
[Qemu-devel] [PATCH v6 17/24] qemu/bitops.h: add the bit ordering reversal functions stolen from linux |
Date: |
Wed, 6 Mar 2013 15:27:30 +0800 |
Signed-off-by: Kuo-Jung Su <address@hidden>
---
include/qemu/bitops.h | 63 ++++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 62 insertions(+), 1 deletion(-)
diff --git a/include/qemu/bitops.h b/include/qemu/bitops.h
index affcc96..920d028 100644
--- a/include/qemu/bitops.h
+++ b/include/qemu/bitops.h
@@ -3,7 +3,8 @@
*
* Copyright (C) 2010 Corentin Chary <address@hidden>
*
- * Mostly inspired by (stolen from) linux/bitmap.h and linux/bitops.h
+ * Mostly inspired by (stolen from) linux/bitmap.h, linux/bitops.h
+ * and linux/bitrev.h
*
* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
* See the COPYING.LIB file in the top-level directory.
@@ -273,4 +274,64 @@ static inline uint64_t deposit64(uint64_t value, int
start, int length,
return (value & ~mask) | ((fieldval << start) & mask);
}
+/**
+ * bitrev8:
+ * @value: the value to reverse bit ordering from
+ *
+ * Reverse the 8 bit input @value
+ *
+ * Returns: the input @value with reversed bit ordering
+ */
+static inline uint8_t bitrev8(uint8_t value)
+{
+ int i;
+ uint8_t ret = 0;
+ for (i = 0; i < 8; ++i) {
+ if (value & BIT(i)) {
+ ret |= BIT(7 - i);
+ }
+ }
+ return ret;
+}
+
+/**
+ * bitrev16:
+ * @value: the value to reverse bit ordering from
+ *
+ * Reverse the 16 bit input @value
+ *
+ * Returns: the input @value with reversed bit ordering
+ */
+static inline uint16_t bitrev16(uint16_t value)
+{
+ return (bitrev8(value & 0xff) << 8) | bitrev8(value >> 8);
+}
+
+/**
+ * bitrev32:
+ * @value: the value to reverse bit ordering from
+ *
+ * Reverse the 32 bit input @value
+ *
+ * Returns: the input @value with reversed bit ordering
+ */
+static inline uint32_t bitrev32(uint32_t value)
+{
+ return (bitrev16(value & 0xffff) << 16) | bitrev16(value >> 16);
+}
+
+/**
+ * bitrev64:
+ * @value: the value to reverse bit ordering from
+ *
+ * Reverse the 64 bit input @value
+ *
+ * Returns: the input @value with reversed bit ordering
+ */
+static inline uint64_t bitrev64(uint64_t value)
+{
+ return ((uint64_t)bitrev32(value & 0xffffffffULL) << 32)
+ | (uint64_t)bitrev32(value >> 32);
+}
+
#endif
--
1.7.9.5
- [Qemu-devel] [PATCH v6 12/24] hw/nand.c: bug fix to erase operation, (continued)
[Qemu-devel] [PATCH v6 13/24] hw/arm: add Faraday FTNANDC021 nand flash controller support, Kuo-Jung Su, 2013/03/06
[Qemu-devel] [PATCH v6 14/24] hw/arm: add Faraday FTI2C010 I2C controller support, Kuo-Jung Su, 2013/03/06
[Qemu-devel] [PATCH v6 15/24] hw: add WM8731 codec support, Kuo-Jung Su, 2013/03/06
[Qemu-devel] [PATCH v6 16/24] hw/arm: add Faraday FTSSP010 multi-function controller support, Kuo-Jung Su, 2013/03/06
[Qemu-devel] [PATCH v6 17/24] qemu/bitops.h: add the bit ordering reversal functions stolen from linux,
Kuo-Jung Su <=
[Qemu-devel] [PATCH v6 18/24] hw/arm: add Faraday FTGMAC100 1Gbps ethernet support, Kuo-Jung Su, 2013/03/06
[Qemu-devel] [PATCH v6 19/24] hw/arm: add Faraday FTLCDC200 LCD controller support, Kuo-Jung Su, 2013/03/06
[Qemu-devel] [PATCH v6 20/24] hw/arm: add Faraday FTTSC010 touchscreen controller support, Kuo-Jung Su, 2013/03/06
[Qemu-devel] [PATCH v6 21/24] hw/arm: add Faraday FTSDC010 MMC/SD controller support, Kuo-Jung Su, 2013/03/06
[Qemu-devel] [PATCH v6 22/24] hw/arm: add Faraday FTMAC110 10/100Mbps ethernet support, Kuo-Jung Su, 2013/03/06
[Qemu-devel] [PATCH v6 23/24] hw/arm: add Faraday FTTMR010 timer support, Kuo-Jung Su, 2013/03/06
[Qemu-devel] [PATCH v6 24/24] hw/arm: add Faraday FTSPI020 SPI flash controller support, Kuo-Jung Su, 2013/03/06