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Tue, 23 Jul 2024 14:12:04 -0700 (PDT) From: Andrew Cooper To: Xen-devel Cc: Andrew Cooper , Jan Beulich , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= Subject: [PATCH] x86/APIC: Rewrite apic_isr_read() to match apic_{tmr,irr}_read() Date: Tue, 23 Jul 2024 22:12:02 +0100 Message-Id: <20240723211202.267212-1-andrew.cooper3@citrix.com> X-Mailer: git-send-email 2.39.2 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @citrix.com) X-ZM-MESSAGEID: 1721769147855116600 This allows for marginally better code generation including the use of BT rather than SHR/TEST. Signed-off-by: Andrew Cooper Reviewed-by: Jan Beulich --- CC: Jan Beulich CC: Roger Pau Monn=C3=A9 --- xen/arch/x86/include/asm/apic.h | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/xen/arch/x86/include/asm/apic.h b/xen/arch/x86/include/asm/api= c.h index 1133954e5540..22d949d7bf31 100644 --- a/xen/arch/x86/include/asm/apic.h +++ b/xen/arch/x86/include/asm/apic.h @@ -126,10 +126,9 @@ static inline void apic_icr_write(u32 low, u32 dest) } } =20 -static inline bool apic_isr_read(uint8_t vector) +static inline bool apic_isr_read(unsigned int vector) { - return (apic_read(APIC_ISR + ((vector & ~0x1f) >> 1)) >> - (vector & 0x1f)) & 1; + return apic_read(APIC_ISR + (vector / 32 * 0x10)) & (1U << (vector % 3= 2)); } =20 static inline bool apic_tmr_read(unsigned int vector) --=20 2.39.2