41 lines
1.3 KiB
C++
41 lines
1.3 KiB
C++
#pragma once
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#if defined(__FreeBSD__) && !defined(_KERNEL)
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# include "pal_bsd_aligned.h"
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namespace snmalloc
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{
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/**
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* FreeBSD-specific platform abstraction layer.
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*
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* This adds FreeBSD-specific aligned allocation to the generic BSD
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* implementation.
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*/
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class PALFreeBSD : public PALBSD_Aligned<PALFreeBSD>
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{
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public:
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/**
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* Bitmap of PalFeatures flags indicating the optional features that this
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* PAL supports.
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*
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* The FreeBSD PAL does not currently add any features beyond those of a
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* generic BSD with support for arbitrary alignment from `mmap`. This
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* field is declared explicitly to remind anyone modifying this class to
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* add new features that they should add any required feature flags.
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*/
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static constexpr uint64_t pal_features = PALBSD_Aligned::pal_features;
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/**
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* FreeBSD uses atypically small address spaces on its 64 bit RISC machines.
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* Problematically, these are so small that if we used the default
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* address_bits (48), we'd try to allocate the whole AS (or larger!) for the
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* Pagemap itself!
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*/
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static constexpr size_t address_bits = (Aal::bits == 32) ?
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Aal::address_bits :
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(Aal::aal_name == RISCV ? 38 : Aal::address_bits);
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// TODO, if we ever backport to MIPS, this should yield 39 there.
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};
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} // namespace snmalloc
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#endif
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