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891b40a2af
This patch creates a seastar enabled version of the xen gntalloc device. TODO: grow the table dynamically, and fix the index selection algorithm. Shouldn't just always bump 1. Signed-off-by: Glauber Costa <glommer@cloudius-systems.com>
36 lines
942 B
C++
36 lines
942 B
C++
#ifndef _XEN_GNTALLOC_HH
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#define _XEN_GNTALLOC_HH
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#include "core/posix.hh"
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typedef std::pair<int, void *> gntref;
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class gntalloc;
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class grant_head {
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protected:
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unsigned _id = 0;
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std::vector<gntref> _refs;
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public:
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grant_head(std::vector<gntref> r) : _refs(r) {}
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virtual gntref& new_ref() = 0;
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virtual gntref& new_ref(void *addr, size_t size) = 0;
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};
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class gntalloc {
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protected:
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static gntalloc *_instance;
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unsigned _otherend;
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public:
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static gntalloc *instance(bool userspace, unsigned otherend);
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static gntalloc *instance();
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gntalloc(unsigned otherend) : _otherend(otherend) {}
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virtual gntref alloc_ref() = 0;
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// The kernel interface can defer allocation, userspace allocation
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// cannot. The boolean "alloc" tell us whether or not we should allocate
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// now or try to defer.
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virtual grant_head *alloc_ref(unsigned nr_ents, bool alloc) = 0;
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friend class grant_head;
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};
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#endif
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