BOOLEAN
ApIsValidChecksum (
ACPI_TABLE_HEADER *Table)
{
ACPI_STATUS Status;
ACPI_TABLE_RSDP *Rsdp;
if (ACPI_VALIDATE_RSDP_SIG (Table->Signature))
{
/*
* Checksum for RSDP.
* Note: Other checksums are computed during the table dump.
*/
Rsdp = ACPI_CAST_PTR (ACPI_TABLE_RSDP, Table);
Status = AcpiTbValidateRsdp (Rsdp);
}
else
{
Status = AcpiTbVerifyChecksum (Table, Table->Length);
}
if (ACPI_FAILURE (Status))
{
AcpiLogError ("%4.4s: Warning: wrong checksum in table\n",
Table->Signature);
}
return (AE_OK);
}
UINT8 *
AcpiTbScanMemoryForRsdp (
UINT8 *StartAddress,
UINT32 Length)
{
ACPI_STATUS Status;
UINT8 *MemRover;
UINT8 *EndAddress;
ACPI_FUNCTION_TRACE (TbScanMemoryForRsdp);
EndAddress = StartAddress + Length;
/* Search from given start address for the requested length */
for (MemRover = StartAddress; MemRover < EndAddress;
MemRover += ACPI_RSDP_SCAN_STEP)
{
/* The RSDP signature and checksum must both be correct */
Status = AcpiTbValidateRsdp (
ACPI_CAST_PTR (ACPI_TABLE_RSDP, MemRover));
if (ACPI_SUCCESS (Status))
{
/* Sig and checksum valid, we have found a real RSDP */
ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
"RSDP located at physical address %p\n", MemRover));
return_PTR (MemRover);
}
/* No sig match or bad checksum, keep searching */
}
/* Searched entire block, no RSDP was found */
ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
"Searched entire block from %p, valid RSDP was not found\n",
StartAddress));
return_PTR (NULL);
}
