From: Julien Grall <julien.grall@arm.com>
To: xen-devel@lists.xen.org
Cc: andre.przywara@arm.com, Julien Grall <julien.grall@arm.com>,
sstabellini@kernel.org, wei.chen@arm.com, steve.capper@arm.com
Subject: [PATCH v3 04/16] xen/arm: Add cpu_hwcap bitmap
Date: Tue, 7 Jun 2016 17:06:11 +0100 [thread overview]
Message-ID: <1465315583-1278-5-git-send-email-julien.grall@arm.com> (raw)
In-Reply-To: <1465315583-1278-1-git-send-email-julien.grall@arm.com>
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@arm.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
---
Changes in v3:
- Add Stefano's reviewed-by
---
xen/arch/arm/Makefile | 1 +
xen/arch/arm/cpufeature.c | 34 ++++++++++++++++++++++++++++++++++
xen/include/asm-arm/cpufeature.h | 29 +++++++++++++++++++++++++++++
3 files changed, 64 insertions(+)
create mode 100644 xen/arch/arm/cpufeature.c
diff --git a/xen/arch/arm/Makefile b/xen/arch/arm/Makefile
index bd93013..b95d924 100644
--- a/xen/arch/arm/Makefile
+++ b/xen/arch/arm/Makefile
@@ -6,6 +6,7 @@ subdir-$(CONFIG_ACPI) += acpi
obj-y += bootfdt.o
obj-y += cpu.o
+obj-y += cpufeature.o
obj-y += decode.o
obj-y += device.o
obj-y += domain.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 7b519cd..2bebad1 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:
--
1.9.1
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next prev parent reply other threads:[~2016-06-07 16:06 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-07 16:06 [PATCH v3 00/16] xen/arm: Introduce alternative runtime patching for ARM64 Julien Grall
2016-06-07 16:06 ` [PATCH v3 01/16] xen/arm: Makefile: Sort the entries alphabetically Julien Grall
2016-06-07 16:06 ` [PATCH v3 02/16] xen/arm: Include the header asm-arm/system.h in asm-arm/page.h Julien Grall
2016-06-07 16:06 ` [PATCH v3 03/16] xen/arm: Add macros to handle the MIDR Julien Grall
2016-06-07 16:06 ` Julien Grall [this message]
2016-06-07 16:06 ` [PATCH v3 05/16] xen/arm64: Add an helper to invalidate all instruction caches Julien Grall
2016-06-07 16:06 ` [PATCH v3 06/16] xen/arm: arm64: Move the define BRK_BUG_FRAME into a separate header Julien Grall
2016-06-07 16:06 ` [PATCH v3 07/16] xen/arm: arm64: Reserve a brk immediate to fault on purpose Julien Grall
2016-06-07 16:06 ` [PATCH v3 08/16] xen/arm: arm64: Add helpers to decode and encode branch instructions Julien Grall
2016-06-07 16:06 ` [PATCH v3 09/16] xen/arm: Introduce alternative runtime patching Julien Grall
2016-06-07 17:24 ` Konrad Rzeszutek Wilk
2016-06-08 9:39 ` Julien Grall
2016-06-08 18:17 ` Konrad Rzeszutek Wilk
2016-06-08 18:22 ` Julien Grall
2016-06-08 18:35 ` Konrad Rzeszutek Wilk
2016-06-09 13:33 ` Julien Grall
2016-06-07 16:06 ` [PATCH v3 10/16] xen/arm: cpufeature: Provide an helper to check if a capability is supported Julien Grall
2016-06-22 9:59 ` Stefano Stabellini
2016-06-22 10:09 ` Julien Grall
2016-06-22 10:14 ` Stefano Stabellini
2016-06-07 16:06 ` [PATCH v3 11/16] xen/arm: Detect silicon revision and set cap bits accordingly Julien Grall
2016-06-22 10:00 ` Stefano Stabellini
2016-06-07 16:06 ` [PATCH v3 12/16] xen/arm: Document the errata implemented in Xen Julien Grall
2016-06-22 10:03 ` Stefano Stabellini
2016-06-07 16:06 ` [PATCH v3 13/16] xen/arm: arm64: Add Cortex-A53 cache errata workaround Julien Grall
2016-06-22 10:04 ` Stefano Stabellini
2016-06-07 16:06 ` [PATCH v3 14/16] xen/arm: arm64: Add cortex-A57 erratum 832075 workaround Julien Grall
2016-06-22 10:10 ` Stefano Stabellini
2016-06-07 16:06 ` [PATCH v3 15/16] xen/arm: traps: Don't inject a fault if the translation VA -> IPA fails Julien Grall
2016-06-07 16:06 ` [PATCH v3 16/16] xen/arm: arm64: Document Cortex-A57 erratum 834220 Julien Grall
2016-06-14 12:15 ` Julien Grall
2016-06-22 10:08 ` Stefano Stabellini
2016-06-22 10:18 ` Julien Grall
2016-06-22 10:37 ` Stefano Stabellini
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