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Diffstat (limited to 'Lesson_29/UefiLessonsPkg/AcpiInfo/AcpiInfo.c')
-rw-r--r--Lesson_29/UefiLessonsPkg/AcpiInfo/AcpiInfo.c106
1 files changed, 106 insertions, 0 deletions
diff --git a/Lesson_29/UefiLessonsPkg/AcpiInfo/AcpiInfo.c b/Lesson_29/UefiLessonsPkg/AcpiInfo/AcpiInfo.c
new file mode 100644
index 0000000..0511f59
--- /dev/null
+++ b/Lesson_29/UefiLessonsPkg/AcpiInfo/AcpiInfo.c
@@ -0,0 +1,106 @@
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiLib.h>
+
+#include <Library/BaseMemoryLib.h>
+#include <Protocol/Shell.h>
+
+EFI_STATUS
+EFIAPI
+UefiMain (
+ IN EFI_HANDLE ImageHandle,
+ IN EFI_SYSTEM_TABLE *SystemTable
+ )
+{
+ EFI_SHELL_PROTOCOL* ShellProtocol;
+ EFI_STATUS Status = gBS->LocateProtocol(
+ &gEfiShellProtocolGuid,
+ NULL,
+ (VOID **)&ShellProtocol
+ );
+
+ if (EFI_ERROR(Status)) {
+ Print(L"Can't open EFI_SHELL_PROTOCOL: %r\n", Status);
+ return EFI_SUCCESS;
+ }
+
+ 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);
+ CHAR16 TableName[5];
+ TableName[0] = (CHAR16)((table->Signature>> 0)&0xFF);
+ TableName[1] = (CHAR16)((table->Signature>> 8)&0xFF);
+ TableName[2] = (CHAR16)((table->Signature>>16)&0xFF);
+ TableName[3] = (CHAR16)((table->Signature>>24)&0xFF);
+ TableName[4] = 0;
+
+ Print(L"\t%s table is placed at address %p with length 0x%x\n",
+ TableName,
+ table,
+ table->Length);
+ CHAR16 FileName[9] = {0};
+ StrCpyS(FileName, 9, TableName);
+ StrCatS(FileName, 9, L".aml");
+ SHELL_FILE_HANDLE FileHandle;
+ Status = ShellProtocol->OpenFileByName(FileName,
+ &FileHandle,
+ EFI_FILE_MODE_CREATE | EFI_FILE_MODE_WRITE | EFI_FILE_MODE_READ);
+ if (!EFI_ERROR(Status)) {
+ UINTN size = table->Length;
+ Status = ShellProtocol->WriteFile(FileHandle, &size, (VOID*)table);
+ if (EFI_ERROR(Status)) {
+ Print(L"Error in WriteFile: %r\n", Status);
+ }
+ Status = ShellProtocol->CloseFile(FileHandle);
+ if (EFI_ERROR(Status)) {
+ Print(L"Error in CloseFile: %r\n", Status);
+ }
+ } else {
+ Print(L"Error in OpenFileByName: %r\n", Status);
+ }
+ offset += sizeof(UINT64);
+ }
+
+ return EFI_SUCCESS;
+}