54 lines
1.4 KiB
C
54 lines
1.4 KiB
C
#include "acpi.h"
|
|
|
|
#include "../types.h"
|
|
#include "../lnxboot.h"
|
|
#include "../util.h"
|
|
|
|
#include "../efi/memmap.h"
|
|
#include "../efi/guid.h"
|
|
#include "../efi/efi.h"
|
|
|
|
bool AcpiIsPresent = false;
|
|
|
|
struct AcpiRSDP* AcpiTheRSDP = 0;
|
|
|
|
void AcpiInitialize() {
|
|
// Check boot params
|
|
if (BootBootParams->acpi_rsdp_addr) {
|
|
AcpiTheRSDP = BootBootParams->acpi_rsdp_addr;
|
|
goto found;
|
|
}
|
|
|
|
// Check firmware
|
|
if (EfiPresent()) {
|
|
const struct EfiSystemTable* SystemTable = EfiGetSystemTable();
|
|
const struct EfiConfigurationTable* ConfigurationTable = EfiTranslatePointer(SystemTable->ConfigurationTable);
|
|
for (int i = 0; i < SystemTable->NumberOfTableEntries; i++) { // this used to break because the cckernel decided to give me one last fuck you
|
|
// and corrupt random portions of code, i really really hate DEFLATE.
|
|
if (CompareMemory(&ConfigurationTable[i].VendorGuid, &EFI_ACPI_20_TABLE_GUID, sizeof(EfiGuid))) {
|
|
AcpiTheRSDP = ConfigurationTable[i].VendorTable;
|
|
goto found;
|
|
}
|
|
}
|
|
}
|
|
|
|
goto fail;
|
|
|
|
found: // Is this a valid ACPI table?
|
|
if (!CompareMemory(AcpiTheRSDP->Signature, "RSD PTR ", 8)) goto fail;
|
|
|
|
// Check the sum
|
|
u8 Sum = 0;
|
|
for (int i = 0; i < sizeof(struct AcpiRSDP); i++) Sum += ((u8*)AcpiTheRSDP)[i];
|
|
if (Sum != 0) goto fail;
|
|
|
|
AcpiIsPresent = true;
|
|
return;
|
|
|
|
fail: AcpiIsPresent = false;
|
|
return;
|
|
}
|
|
|
|
bool AcpiPresent() { return AcpiIsPresent; }
|
|
struct AcpiRSDP* AcpiGetRSDP() { return AcpiTheRSDP; }
|