[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen stable-4.7] xen/arm: Add cpu_hwcap bitmap
commit 112c49c114ffe37e068fc9f13e960a8f275379d2 Author: Julien Grall <julien.grall@xxxxxxx> AuthorDate: Wed Jun 22 12:15:19 2016 +0100 Commit: Stefano Stabellini <sstabellini@xxxxxxxxxx> CommitDate: Wed Jan 24 14:08:53 2018 -0800 xen/arm: Add cpu_hwcap bitmap This will be used to know if a feature, which Xen cares, is available accross all the CPUs. This code is a light version of arch/arm64/kernel/cpufeature.c from Linux v4.6-rc3. Signed-off-by: Julien Grall <julien.grall@xxxxxxx> Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx> Signed-off-by: Stefano Stabellini <sstabellini@xxxxxxxxxx> (cherry picked from commit bfb489629c0c5f36c60dec879383cbed4080a509) Conflicts: xen/arch/arm/Makefile --- xen/arch/arm/Makefile | 1 + xen/arch/arm/cpufeature.c | 34 ++++++++++++++++++++++++++++++++++ xen/include/asm-arm/cpufeature.h | 29 +++++++++++++++++++++++++++++ 3 files changed, 64 insertions(+) diff --git a/xen/arch/arm/Makefile b/xen/arch/arm/Makefile index 9e38da3..4861320 100644 --- a/xen/arch/arm/Makefile +++ b/xen/arch/arm/Makefile @@ -6,6 +6,7 @@ subdir-$(CONFIG_ACPI) += acpi obj-$(EARLY_PRINTK) += early_printk.o obj-y += cpu.o +obj-y += cpufeature.o obj-y += domain.o obj-y += psci.o obj-y += vpsci.o diff --git a/xen/arch/arm/cpufeature.c b/xen/arch/arm/cpufeature.c new file mode 100644 index 0000000..7a1b56b --- /dev/null +++ b/xen/arch/arm/cpufeature.c @@ -0,0 +1,34 @@ +/* + * Contains CPU feature definitions + * + * Copyright (C) 2015 ARM Ltd. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <xen/config.h> +#include <xen/types.h> +#include <xen/init.h> +#include <xen/smp.h> +#include <asm/cpufeature.h> + +DECLARE_BITMAP(cpu_hwcaps, ARM_NCAPS); + +/* + * Local variables: + * mode: C + * c-file-style: "BSD" + * c-basic-offset: 4 + * indent-tabs-mode: nil + * End: + */ diff --git a/xen/include/asm-arm/cpufeature.h b/xen/include/asm-arm/cpufeature.h index 6079fa1..e5ff974 100644 --- a/xen/include/asm-arm/cpufeature.h +++ b/xen/include/asm-arm/cpufeature.h @@ -35,6 +35,35 @@ #endif #define cpu_has_security (boot_cpu_feature32(security) > 0) +#define ARM_NCAPS 0 + +#ifndef __ASSEMBLY__ + +#include <xen/types.h> +#include <xen/lib.h> +#include <xen/bitops.h> + +extern DECLARE_BITMAP(cpu_hwcaps, ARM_NCAPS); + +static inline bool_t cpus_have_cap(unsigned int num) +{ + if ( num >= ARM_NCAPS ) + return 0; + + return test_bit(num, cpu_hwcaps); +} + +static inline void cpus_set_cap(unsigned int num) +{ + if (num >= ARM_NCAPS) + printk(XENLOG_WARNING "Attempt to set an illegal CPU capability (%d >= %d)\n", + num, ARM_NCAPS); + else + __set_bit(num, cpu_hwcaps); +} + +#endif /* __ASSEMBLY__ */ + #endif /* * Local variables: -- generated by git-patchbot for /home/xen/git/xen.git#stable-4.7 _______________________________________________ Xen-changelog mailing list Xen-changelog@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/xen-changelog
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