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Kernel: Move sys$munmap functionality into a helper method

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This commit is contained in:
Gunnar Beutner 2021-05-28 11:03:21 +02:00 • committed by Andreas Kling
parent b9d693665b
commit 95c2166ca9
5 changed files with 123 additions and 94 deletions
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18
Kernel/VM/Range.cpp
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@ -7,6 +7,7 @@
#include <AK/Vector.h>
#include <Kernel/Arch/x86/CPU.h>
#include <Kernel/VM/MemoryManager.h>
#include <Kernel/VM/Range.h>
namespace Kernel {
@ -35,4 +36,21 @@ Range Range::intersect(const Range& other) const
return Range(new_base, (new_end - new_base).get());
}
KResultOr<Range> Range::expand_to_page_boundaries(FlatPtr address, size_t size)
{
if (page_round_up_would_wrap(size))
return EINVAL;
if ((address + size) < address)
return EINVAL;
if (page_round_up_would_wrap(address + size))
return EINVAL;
auto base = VirtualAddress { address }.page_base();
auto end = page_round_up(address + size);
return Range { base, end - base.get() };
}
}