[xen stable-4.6] xen/arm: Add cpu_hwcap bitmap

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[xen stable-4.6] xen/arm: Add cpu_hwcap bitmap

patchbot
commit 3c706195565910b961eb5a7e64f34948deb2a545
Author:     Julien Grall <[hidden email]>
AuthorDate: Wed Jun 22 12:15:19 2016 +0100
Commit:     Stefano Stabellini <[hidden email]>
CommitDate: Fri Feb 16 16:34:40 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 <[hidden email]>
    Reviewed-by: Stefano Stabellini <[hidden email]>
    Signed-off-by: Stefano Stabellini <[hidden email]>
    (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 1ef39f7cdd..17abfbdb1f 100644
--- a/xen/arch/arm/Makefile
+++ b/xen/arch/arm/Makefile
@@ -5,6 +5,7 @@ subdir-$(arm64) += efi
 
 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 0000000000..7a1b56b67e
--- /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 7b519cddc6..2bebad16cd 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-4.6

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