1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
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;
}
|
