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module acpi;
import c3os::util;
extern fn int memcmp(void*, void*, usz);
fn bool RootSystemDescriptionPointer.is_valid(&self)
{
if (memcmp(&self.signature, "RSD PTR ", 8) != 0) return false;
if (self.revision != 2) return false;
char sum = 0;
for (int i = 0; i < 20; i++) sum += ((char*)self)[i];
if (sum != 0) return false;
for (int i = 0; i < RootSystemDescriptionPointer::size; i++) sum += ((char*)self)[i];
return (sum == 0);
}
fn bool ExtendedSystemDescriptionTable.is_valid(&self)
{
if (memcmp(&self.signature, "XSDT", 4) != 0) return false;
if (self.revision != 1) return false;
char sum = 0;
for (uint i = 0; i < self.length; i++) sum += ((char*)self)[i];
if (sum != 0) return false;
return true;
}
fn bool DescriptionHeader.is_valid(&self)
{
if (catch excuse = self.sig()) return false;
char sum = 0;
for (uint i = 0; i < self.length; i++) sum += ((char*)self)[i];
if (sum != 0) return false;
return true;
}
fn DescriptionHeaderSignature? DescriptionHeader.sig(&self)
{
foreach (i, name : DescriptionHeaderSignature::names)
{
if (memcmp(name, &self.signature, 4) == 0) return (DescriptionHeaderSignature)i;
}
return INVALID_DESCRIPTION_HEADER~;
}
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