diff mbox series

[v12,11/12] qemu/bitops.h: Add extract8 andextract16

Message ID 20190514061458.125225-12-ysato@users.sourceforge.jp
State New
Headers show
Series Add RX archtecture support | expand

Commit Message

Yoshinori Sato May 14, 2019, 6:14 a.m. UTC 
Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>
---
 include/qemu/bitops.h | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

Comments

Richard Henderson May 15, 2019, 4:22 p.m. UTC | #1 
On 5/13/19 11:14 PM, Yoshinori Sato wrote:
> Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>
> ---
>  include/qemu/bitops.h | 38 ++++++++++++++++++++++++++++++++++++++
>  1 file changed, 38 insertions(+)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>


r~
diff mbox series

Patch

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
@@ -301,6 +301,44 @@  static inline uint32_t extract32(uint32_t value, int start, int 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
  * @start: the lowest bit in the bit field (numbered from 0)