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/**
* Copyright (c) 2026 Alexey Gavrilov <alexey.gavrilov@mail.com>
*
* This file is part of ObjectiveOS.
*
* ObjectiveOS is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later
* version.
*
* ObjectiveOS is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
* A PARTICULAR PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with
* ObjectiveOS. If not, see <https://www.gnu.org/licenses/>.
*/
#include "Acpi.h"
const char *Rsdp::signatureString = "RSD PTR ";
const uint8 Rsdp::validFieldRevision = 2;
const uintptr Rsdp::romAreaStart = 0xe0000;
const uintptr Rsdp::romAreaEnd = 0xfffff;
const uintptr Rsdp::ebdaAreaStart = 0x80000;
const uintptr Rsdp::ebdaAreaEnd = 0x803ff;
const uint8 Rsdp::checksunFieldSize = 20;
const uint8 Entry::size = 4;
const uint8 sizeWithoutIcs = 44;
Rsdt *Rsdp::getRsdt() const
{
Rsdt *rsdtPtr = (Rsdt *)(rsdtAddress);
if(rsdtPtr == nullptr or checksumCheck()) return nullptr;
else return rsdtPtr;
};
Xsdt *Rsdp::getXsdt() const
{
Xsdt *xsdtPtr = (Xsdt *)(xsdtAddress);
if(xsdtPtr == nullptr or checksumCheck()) return nullptr;
else return xsdtPtr;
};
const uint32 DescHeader::getLength() const
{
return length;
};
const Entry *Rsdt::getEntry(uint8 index) const
{
uint32 entriesAmount = (header.getLength() - sizeof(DescHeader)) / Entry::size;
if(index >= entriesAmount
or header.checksumCheck()) return nullptr;
else return ((const Entry **)&entries)[index];
};
uint8 Rsdp::checksumCheck() const
{
uint8 check = 0;
for(uint32 offset = 0; offset < checksunFieldSize; offset++)
{
check += *(uint8 *)((uintptr)this + offset);
}
return check;
};
uint8 DescHeader::checksumCheck() const
{
uint8 check = 0;
for(uint32 offset = 0; offset < length; offset++)
{
check += *(uint8 *)((uintptr)this + offset);
}
return check;
};
const Ics *Madt::getIcs(uint8 index) const
{
if(header.checksumCheck()) return nullptr;
uint32 icsBytesRemain = header.getLength() - ::sizeWithoutIcs;
uint16 indexAmass = 0;
const Ics *icsPtr = (Ics *)(&icsBegin);
while(icsBytesRemain > 0)
{
if(indexAmass == index) return icsPtr;
else
{
icsBytesRemain -= icsPtr->getLength();
indexAmass++;
icsPtr = (Ics *)((uintptr)icsPtr + icsPtr->getLength());
}
}
return nullptr;
};
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