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[PATCH v29 02/22] qemu/bitops.h: Add extract8 and extract16
From: |
Yoshinori Sato |
Subject: |
[PATCH v29 02/22] qemu/bitops.h: Add extract8 and extract16 |
Date: |
Thu, 23 Jan 2020 22:25:05 +0900 |
Signed-off-by: Yoshinori Sato <address@hidden>
Reviewed-by: Richard Henderson <address@hidden>
Reviewed-by: Philippe Mathieu-Daudé <address@hidden>
Message-Id: <address@hidden>
Tested-by: Philippe Mathieu-Daudé <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 02c1ce6a5d..f55ce8b320 100644
--- a/include/qemu/bitops.h
+++ b/include/qemu/bitops.h
@@ -301,6 +301,44 @@ 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
--
2.20.1
- [PATCH v29 00/22] Add RX archtecture support, Yoshinori Sato, 2020/01/23
- [PATCH v29 03/22] hw/registerfields.h: Add 8bit and 16bit register macros, Yoshinori Sato, 2020/01/23
- [PATCH v29 01/22] MAINTAINERS: Add RX, Yoshinori Sato, 2020/01/23
- [PATCH v29 02/22] qemu/bitops.h: Add extract8 and extract16,
Yoshinori Sato <=
- [PATCH v29 19/22] hw/rx: Restrict the RX62N microcontroller to the RX62N CPU core, Yoshinori Sato, 2020/01/23
- [PATCH v29 12/22] target/rx: Collect all bytes during disassembly, Yoshinori Sato, 2020/01/23
- [PATCH v29 18/22] hw/rx: Honor -accel qtest, Yoshinori Sato, 2020/01/23
- [PATCH v29 13/22] target/rx: Dump bytes for each insn during disassembly, Yoshinori Sato, 2020/01/23
- [PATCH v29 08/22] target/rx: Disassemble rx_index_addr into a string, Yoshinori Sato, 2020/01/23
- [PATCH v29 11/22] target/rx: Emit all disassembly in one prt(), Yoshinori Sato, 2020/01/23
- [PATCH v29 20/22] Add rx-softmmu, Yoshinori Sato, 2020/01/23
- [PATCH v29 09/22] target/rx: Replace operand with prt_ldmi in disassembler, Yoshinori Sato, 2020/01/23
- [PATCH v29 17/22] hw/rx: RX Target hardware definition, Yoshinori Sato, 2020/01/23
- [PATCH v29 07/22] target/rx: RX disassembler, Yoshinori Sato, 2020/01/23