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Tue, 28 May 2024 23:59:10 -0500 From: Tong Ho To: CC: Subject: [PATCH] qemu/bitops.h: Locate changed bits Date: Tue, 28 May 2024 21:59:09 -0700 Message-ID: <20240529045909.1796787-1-tong.ho@amd.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Received-SPF: None (SATLEXMB03.amd.com: tong.ho@amd.com does not designate permitted sender hosts) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN3PEPF0000B06A:EE_|BL1PR12MB5828:EE_ X-MS-Office365-Filtering-Correlation-Id: 202766dd-519f-47a7-5b9a-08dc7f9c1417 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; ARA:13230031|36860700004|82310400017|376005|1800799015; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17; 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These newly added utilities aid common device behaviors where actions are taken only when a register's bit(s) are changed. Signed-off-by: Tong Ho Reviewed-by: Lei Wang --- include/qemu/bitops.h | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/include/qemu/bitops.h b/include/qemu/bitops.h index 2c0a2fe751..7a701474ea 100644 --- a/include/qemu/bitops.h +++ b/include/qemu/bitops.h @@ -148,6 +148,39 @@ static inline int test_bit(long nr, const unsigned long *addr) return 1UL & (addr[BIT_WORD(nr)] >> (nr & (BITS_PER_LONG-1))); } +/** + * find_bits_changed - Returns a mask of bits changed. + * @ref_bits: the reference bits against which the test is made. + * @chk_bits: the bits to be checked. + */ +static inline unsigned long find_bits_changed(unsigned long ref_bits, + unsigned long chk_bits) +{ + return ref_bits ^ chk_bits; +} + +/** + * find_bits_to_1 - Returns a mask of bits changed from 0 to 1. + * @ref_bits: the reference bits against which the test is made. + * @chk_bits: the bits to be checked. + */ +static inline unsigned long find_bits_to_1(unsigned long ref_bits, + unsigned long chk_bits) +{ + return find_bits_changed(ref_bits, chk_bits) & chk_bits; +} + +/** + * find_bits_to_0 - Returns a mask of bits changed from 1 to 0. + * @ref_bits: the reference bits against which the test is made. + * @chk_bits: the bits to be checked. + */ +static inline unsigned long find_bits_to_0(unsigned long ref_bits, + unsigned long chk_bits) +{ + return find_bits_to_1(chk_bits, ref_bits); +} + /** * find_last_bit - find the last set bit in a memory region * @addr: The address to start the search at