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Kernel: Simplify scanning BIOS/EBDA and MP parser initialization

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Add a MappedROM::find_chunk_starting_with() helper since that's a very
common usage pattern in clients of this code.

Also convert MultiProcessorParser from a persistent singleton object
to a temporary object constructed via a failable factory function.
This commit is contained in:
Andreas Kling 2020-05-22 13:34:53 +02:00
parent 84b7bc5e14
commit 4b847810bf
8 changed files with 47 additions and 101 deletions
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9
Kernel/VM/MappedROM.h
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@ -39,6 +39,15 @@ struct MappedROM {
size_t offset { 0 };
PhysicalAddress paddr;
Optional<PhysicalAddress> find_chunk_starting_with(StringView prefix, size_t chunk_size) const
{
for (auto* candidate = base(); candidate < end(); candidate += chunk_size) {
if (!__builtin_memcmp(prefix.characters_without_null_termination(), candidate, prefix.length()))
return paddr_of(candidate);
}
return {};
}
PhysicalAddress paddr_of(const u8* ptr) const { return paddr.offset(ptr - this->base()); }
};