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[PATCH v2 13/19] qemu/bitops.h: Add extract8 and extract16
From: |
Alex Bennée |
Subject: |
[PATCH v2 13/19] qemu/bitops.h: Add extract8 and extract16 |
Date: |
Thu, 13 Feb 2020 22:51:03 +0000 |
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>
Tested-by: Philippe Mathieu-Daudé <address@hidden>
Signed-off-by: Richard Henderson <address@hidden>
Signed-off-by: Alex Bennée <address@hidden>
Message-Id: <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 02c1ce6a5d4..f55ce8b320b 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
- Re: [PATCH v2 01/19] tests/tcg: include a skip runner for pauth3 with plugins, (continued)
- [PATCH v2 02/19] tests/rcutorture: update usage hint, Alex Bennée, 2020/02/13
- [PATCH v2 03/19] tests/rcutorture: better document locking of stats, Alex Bennée, 2020/02/13
- [PATCH v2 05/19] travis.yml: Test the s390-ccw build, too, Alex Bennée, 2020/02/13
- [PATCH v2 06/19] travis.yml: Fix Travis YAML configuration warnings, Alex Bennée, 2020/02/13
- [PATCH v2 04/19] tests/rcutorture: mild documenting refactor of update thread, Alex Bennée, 2020/02/13
- [PATCH v2 07/19] travis.yml: single-thread build-tcg stages, Alex Bennée, 2020/02/13
- [PATCH v2 08/19] tests/iotests: be a little more forgiving on the size test, Alex Bennée, 2020/02/13
- [PATCH v2 13/19] qemu/bitops.h: Add extract8 and extract16,
Alex Bennée <=
- [PATCH v2 10/19] docs/devel: document query handle lifetimes, Alex Bennée, 2020/02/13
- [PATCH v2 11/19] plugins/core: add missing break in cb_to_tcg_flags, Alex Bennée, 2020/02/13
- [PATCH v2 09/19] tracing: only allow -trace to override -D if set, Alex Bennée, 2020/02/13
- [PATCH v2 12/19] tests/plugin: prevent uninitialized warning, Alex Bennée, 2020/02/13
- [PATCH v2 17/19] tcg: save vaddr temp for plugin usage, Alex Bennée, 2020/02/13
- [PATCH v2 15/19] tests/plugins: make howvec clean-up after itself., Alex Bennée, 2020/02/13