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Merge pull request #116 from Andy-Python-Programmer/trunk

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acpi_get_rsdp: UEFI RSDP lookup return RSDPv1 if avaliable
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mint 2021-10-05 00:59:05 +02:00 committed by GitHub
commit fd805e2dba
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1 changed files with 7 additions and 3 deletions
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10
stage23/lib/acpi.c
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@ -64,14 +64,18 @@ void acpi_get_smbios(void **smbios32, void **smbios64) {
#include <efi.h>
void *acpi_get_rsdp(void) {
EFI_GUID acpi_2_guid = ACPI_20_TABLE_GUID;
EFI_GUID acpi_1_guid = ACPI_TABLE_GUID;
for (size_t i = 0; i < gST->NumberOfTableEntries; i++) {
EFI_CONFIGURATION_TABLE *cur_table = &gST->ConfigurationTable[i];
EFI_GUID acpi_2_guid = ACPI_20_TABLE_GUID;
if (memcmp(&cur_table->VendorGuid, &acpi_2_guid, sizeof(EFI_GUID)) != 0)
if (memcmp(&cur_table->VendorGuid, &acpi_2_guid, sizeof(EFI_GUID)) != 0 || // XSDP
memcmp(&cur_table->VendorGuid, &acpi_1_guid, sizeof(EFI_GUID)) != 0) // RSDP
continue;
if (acpi_checksum(cur_table->VendorTable, sizeof(struct rsdp)) != 0)
if (acpi_checksum(cur_table->VendorTable, sizeof(struct rsdp)) != 0 || // XSDP is 36 bytes wide
acpi_checksum(cur_table->VendorTable, 20) != 0) // RSDP is 20 bytes wide
continue;
printv("acpi: Found RSDP at %X\n", cur_table->VendorTable);