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#include <Library/UefiBootServicesTableLib.h>
#include <Library/UefiLib.h>
#include <Library/BaseMemoryLib.h>
EFI_STATUS
EFIAPI
UefiMain (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_ACPI_6_3_ROOT_SYSTEM_DESCRIPTION_POINTER* RSDP = NULL;
for (UINTN i=0; i<SystemTable->NumberOfTableEntries; i++) {
if (CompareGuid(&(SystemTable->ConfigurationTable[i].VendorGuid), &gEfiAcpi20TableGuid)) {
Print(L"RSDP table is placed at %p\n\n", SystemTable->ConfigurationTable[i].VendorTable);
RSDP = SystemTable->ConfigurationTable[i].VendorTable;
}
}
if (!RSDP) {
Print(L"No ACPI2.0 table was found in the system\n");
return EFI_SUCCESS;
}
if (((CHAR8)((RSDP->Signature >> 0) & 0xFF) != 'R') ||
((CHAR8)((RSDP->Signature >> 8) & 0xFF) != 'S') ||
((CHAR8)((RSDP->Signature >> 16) & 0xFF) != 'D') ||
((CHAR8)((RSDP->Signature >> 24) & 0xFF) != ' ') ||
((CHAR8)((RSDP->Signature >> 32) & 0xFF) != 'P') ||
((CHAR8)((RSDP->Signature >> 40) & 0xFF) != 'T') ||
((CHAR8)((RSDP->Signature >> 48) & 0xFF) != 'R') ||
((CHAR8)((RSDP->Signature >> 56) & 0xFF) != ' ')) {
Print(L"Error! RSDP signature is not valid!\n");
return EFI_SUCCESS;
}
Print(L"System description tables:\n");
Print(L"\tRSDT table is placed at address %p\n", RSDP->RsdtAddress);
Print(L"\tXSDT table is placed at address %p\n", RSDP->XsdtAddress);
Print(L"\n");
EFI_ACPI_DESCRIPTION_HEADER* XSDT = (EFI_ACPI_DESCRIPTION_HEADER*)RSDP->XsdtAddress;
if (((CHAR8)((XSDT->Signature >> 0) & 0xFF) != 'X') ||
((CHAR8)((XSDT->Signature >> 8) & 0xFF) != 'S') ||
((CHAR8)((XSDT->Signature >> 16) & 0xFF) != 'D') ||
((CHAR8)((XSDT->Signature >> 24) & 0xFF) != 'T')) {
Print(L"Error! XSDT signature is not valid!\n");
return EFI_SUCCESS;
}
Print(L"Main ACPI tables:\n");
UINT64 offset = sizeof(EFI_ACPI_DESCRIPTION_HEADER);
while (offset < XSDT->Length) {
UINT64* table_address = (UINT64*)((UINT8*)XSDT + offset);
EFI_ACPI_6_3_COMMON_HEADER* table = (EFI_ACPI_6_3_COMMON_HEADER*)(*table_address);
Print(L"\t%c%c%c%c table is placed at address %p with length 0x%x\n",
(CHAR8)((table->Signature>> 0)&0xFF),
(CHAR8)((table->Signature>> 8)&0xFF),
(CHAR8)((table->Signature>>16)&0xFF),
(CHAR8)((table->Signature>>24)&0xFF),
table,
table->Length);
offset += sizeof(UINT64);
}
return EFI_SUCCESS;
}
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