[v4] Qemu SGX virtualization

[PATCH v4 29/33] bitops: Support 32 and 64 bit mask macro

Yang Zhong posted 33 patches 4 years, 6 months ago

Diff against v1 v1 v2 v3 v5
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Maintainers: Eduardo Habkost <ehabkost@redhat.com>, Thomas Huth <thuth@redhat.com>, Peter Xu <peterx@redhat.com>, Richard Henderson <richard.henderson@linaro.org>, David Hildenbrand <david@redhat.com>, Igor Mammedov <imammedo@redhat.com>, Eric Blake <eblake@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>, Alex Williamson <alex.williamson@redhat.com>, Ani Sinha <ani@anisinha.ca>, Markus Armbruster <armbru@redhat.com>, "Daniel P. Berrangé" <berrange@redhat.com>, Laurent Vivier <lvivier@redhat.com>, "Dr. David Alan Gilbert" <dgilbert@redhat.com>, Marcel Apfelbaum <marcel.apfelbaum@gmail.com>, Marcelo Tosatti <mtosatti@redhat.com>, "Michael S. Tsirkin" <mst@redhat.com>

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[PATCH v4 29/33] bitops: Support 32 and 64 bit mask macro

Posted by Yang Zhong 4 years, 6 months ago

The Qemu should enable bit mask macro like Linux did in the
kernel, the GENMASK(h, l) and GENMASK_ULL(h, l) will set the
bit to 1 from l to h bit in the 32 bit or 64 bit long type.

Signed-off-by: Yang Zhong <yang.zhong@intel.com>
---
 include/qemu/bitops.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/qemu/bitops.h b/include/qemu/bitops.h
index 110c56e099..130d746ba3 100644
--- a/include/qemu/bitops.h
+++ b/include/qemu/bitops.h
@@ -18,6 +18,7 @@
 
 #define BITS_PER_BYTE           CHAR_BIT
 #define BITS_PER_LONG           (sizeof (unsigned long) * BITS_PER_BYTE)
+#define BITS_PER_LONG_LONG       64
 
 #define BIT(nr)                 (1UL << (nr))
 #define BIT_ULL(nr)             (1ULL << (nr))
@@ -28,6 +29,12 @@
 #define MAKE_64BIT_MASK(shift, length) \
     (((~0ULL) >> (64 - (length))) << (shift))
 
+#define GENMASK(h, l) \
+    (((~0UL) << (l)) & (~0UL >> (BITS_PER_LONG - 1 - (h))))
+
+#define GENMASK_ULL(h, l) \
+    (((~0ULL) << (l)) & (~0ULL >> (BITS_PER_LONG_LONG - 1 - (h))))
+
 /**
  * set_bit - Set a bit in memory
  * @nr: the bit to set