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[Qemu-devel] [PATCH v16 09/23] qemu/bitops.h: Add extract8 and extract16
From: |
Richard Henderson |
Subject: |
[Qemu-devel] [PATCH v16 09/23] qemu/bitops.h: Add extract8 and extract16 |
Date: |
Fri, 31 May 2019 08:43:01 -0500 |
From: Yoshinori Sato <address@hidden>
Signed-off-by: Yoshinori Sato <address@hidden>
Reviewed-by: Richard Henderson <address@hidden>
Reviewed-by: Philippe Mathieu-Daudé <address@hidden>
Message-Id: <address@hidden>
Signed-off-by: Richard Henderson <address@hidden>
---
include/qemu/bitops.h | 38 ++++++++++++++++++++++++++++++++++++++
1 file changed, 38 insertions(+)
diff --git a/include/qemu/bitops.h b/include/qemu/bitops.h
index 3f0926cf40..764f9d1ea0 100644
--- a/include/qemu/bitops.h
+++ b/include/qemu/bitops.h
@@ -300,6 +300,44 @@ static inline uint32_t extract32(uint32_t value, int
start, int length)
return (value >> start) & (~0U >> (32 - length));
}
+/**
+ * extract8:
+ * @value: the value to extract the bit field from
+ * @start: the lowest bit in the bit field (numbered from 0)
+ * @length: the length of the bit field
+ *
+ * Extract from the 8 bit input @value the bit field specified by the
+ * @start and @length parameters, and return it. The bit field must
+ * lie entirely within the 8 bit word. It is valid to request that
+ * all 8 bits are returned (ie @length 8 and @start 0).
+ *
+ * Returns: the value of the bit field extracted from the input value.
+ */
+static inline uint8_t extract8(uint8_t value, int start, int length)
+{
+ assert(start >= 0 && length > 0 && length <= 8 - start);
+ return extract32(value, start, length);
+}
+
+/**
+ * extract16:
+ * @value: the value to extract the bit field from
+ * @start: the lowest bit in the bit field (numbered from 0)
+ * @length: the length of the bit field
+ *
+ * Extract from the 16 bit input @value the bit field specified by the
+ * @start and @length parameters, and return it. The bit field must
+ * lie entirely within the 16 bit word. It is valid to request that
+ * all 16 bits are returned (ie @length 16 and @start 0).
+ *
+ * Returns: the value of the bit field extracted from the input value.
+ */
+static inline uint16_t extract16(uint16_t value, int start, int length)
+{
+ assert(start >= 0 && length > 0 && length <= 16 - start);
+ return extract32(value, start, length);
+}
+
/**
* extract64:
* @value: the value to extract the bit field from
--
2.17.1
- [Qemu-devel] [PATCH v16 00/23] Add RX architecture, Richard Henderson, 2019/05/31
- [Qemu-devel] [PATCH v16 02/23] target/rx: TCG helper, Richard Henderson, 2019/05/31
- [Qemu-devel] [PATCH v16 03/23] target/rx: CPU definition, Richard Henderson, 2019/05/31
- [Qemu-devel] [PATCH v16 05/23] hw/intc: RX62N interrupt controller (ICUa), Richard Henderson, 2019/05/31
- [Qemu-devel] [PATCH v16 04/23] target/rx: RX disassembler, Richard Henderson, 2019/05/31
- [Qemu-devel] [PATCH v16 07/23] hw/char: RX62N serial communication interface (SCI), Richard Henderson, 2019/05/31
- [Qemu-devel] [PATCH v16 06/23] hw/timer: RX62N internal timer modules, Richard Henderson, 2019/05/31
- [Qemu-devel] [PATCH v16 09/23] qemu/bitops.h: Add extract8 and extract16,
Richard Henderson <=
- [Qemu-devel] [PATCH v16 01/23] target/rx: TCG translation, Richard Henderson, 2019/05/31
- [Qemu-devel] [PATCH v16 13/23] target/rx: Fix cpu types and names, Richard Henderson, 2019/05/31
- [Qemu-devel] [PATCH v16 10/23] hw/registerfields.h: Add 8bit and 16bit register macros, Richard Henderson, 2019/05/31
- [Qemu-devel] [PATCH v16 08/23] hw/rx: RX Target hardware definition, Richard Henderson, 2019/05/31
- [Qemu-devel] [PATCH v16 15/23] hw/rx: Honor -accel qtest, Richard Henderson, 2019/05/31
- [Qemu-devel] [PATCH v16 12/23] target/rx: Add RX to SysEmuTarget, Richard Henderson, 2019/05/31
- [Qemu-devel] [PATCH v16 16/23] Add rx-softmmu, Richard Henderson, 2019/05/31