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Kernel: Implement helper to find multiple Regions in a Range

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Hendiadyoin1 2021-02-24 16:44:00 +01:00 • committed by Andreas Kling
parent 7874b89426
commit 61f0aa6e75
2 changed files with 26 additions and 0 deletions
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22
Kernel/VM/Space.cpp
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@ -1,5 +1,6 @@
/* /*
* Copyright (c) 2021, Andreas Kling <kling@serenityos.org> * Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021, Leon Albrecht <leon2002.la@gmail.com>
* All rights reserved. * All rights reserved.
* *
* Redistribution and use in source and binary forms, with or without * Redistribution and use in source and binary forms, with or without
@ -158,6 +159,27 @@ Region* Space::find_region_containing(const Range& range)
return nullptr; return nullptr;
} }
Vector<Region*> Space::find_regions_intersecting(const Range& range)
{
Vector<Region*> regions = {};
size_t total_size_collected = 0;
ScopedSpinLock lock(m_lock);
// FIXME: Maybe take the cache from the single lookup?
for (auto& region : m_regions) {
if (region.range().base() < range.end() && region.range().end() > range.base()) {
regions.append(&region);
total_size_collected += region.size() - region.range().intersect(range).size();
if (total_size_collected == range.size())
break;
}
}
return regions;
}
Region& Space::add_region(NonnullOwnPtr<Region> region) Region& Space::add_region(NonnullOwnPtr<Region> region)
{ {
auto* ptr = region.ptr(); auto* ptr = region.ptr();

4
Kernel/VM/Space.h
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@ -1,5 +1,6 @@
/* /*
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org> * Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021, Leon Albrecht <leon2002.la@gmail.com>
* All rights reserved. * All rights reserved.
* *
* Redistribution and use in source and binary forms, with or without * Redistribution and use in source and binary forms, with or without
@ -27,6 +28,7 @@
#pragma once #pragma once
#include <AK/NonnullOwnPtrVector.h> #include <AK/NonnullOwnPtrVector.h>
#include <AK/Vector.h>
#include <AK/WeakPtr.h> #include <AK/WeakPtr.h>
#include <Kernel/UnixTypes.h> #include <Kernel/UnixTypes.h>
#include <Kernel/VM/AllocationStrategy.h> #include <Kernel/VM/AllocationStrategy.h>
@ -63,6 +65,8 @@ public:
Region* find_region_from_range(const Range&); Region* find_region_from_range(const Range&);
Region* find_region_containing(const Range&); Region* find_region_containing(const Range&);
Vector<Region*> find_regions_intersecting(const Range&);
bool enforces_syscall_regions() const { return m_enforces_syscall_regions; } bool enforces_syscall_regions() const { return m_enforces_syscall_regions; }
void set_enforces_syscall_regions(bool b) { m_enforces_syscall_regions = b; } void set_enforces_syscall_regions(bool b) { m_enforces_syscall_regions = b; }