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
|
/** @file
This PRM Module demonstrates how to define an ACPI parameter buffer that is used by a PRM handler.
Copyright (c) Microsoft Corporation
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <PrmModule.h>
#include <Library/BaseLib.h>
#include <Library/UefiLib.h>
// TEMP
#include <Library/DebugLib.h>
#define PARAM_BUFFER_TEST_SIGNATURE SIGNATURE_32('T','E','S','T')
//
// PRM Handler GUIDs
//
// {2e4f2d13-6240-4ed0-a401-c723fbdc34e8}
#define CHECK_PARAM_BUFFER_PRM_HANDLER_GUID {0x2e4f2d13, 0x6240, 0x4ed0, {0xa4, 0x01, 0xc7, 0x23, 0xfb, 0xdc, 0x34, 0xe8}}
/**
A sample Platform Runtime Mechanism (PRM) handler.
This sample handler checks if a parameter buffer is provided with the data signature
('T', 'E', 'S', 'T') at the beginning of the buffer.
The contents are expected to be updated by ACPI code at OS runtime.
@param[in] ParameterBuffer A pointer to the PRM handler parameter buffer
@param[in] ContextBUffer A pointer to the PRM handler context buffer
@retval EFI_STATUS The PRM handler executed successfully.
@retval Others An error occurred in the PRM handler.
**/
PRM_HANDLER_EXPORT (CheckParamBufferPrmHandler) {
if (ParameterBuffer == NULL) {
return EFI_INVALID_PARAMETER;
}
if (*((UINT32 *)ParameterBuffer) == PARAM_BUFFER_TEST_SIGNATURE) {
return EFI_SUCCESS;
}
return EFI_NOT_FOUND;
}
//
// Register the PRM export information for this PRM Module
//
PRM_MODULE_EXPORT (
PRM_HANDLER_EXPORT_ENTRY (CHECK_PARAM_BUFFER_PRM_HANDLER_GUID, CheckParamBufferPrmHandler)
);
/**
Module entry point.
@param[in] ImageHandle The image handle.
@param[in] SystemTable A pointer to the system table.
@retval EFI_SUCCESS This function always returns success.
**/
EFI_STATUS
EFIAPI
PrmSampleAcpiParameterBufferModuleInit (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
return EFI_SUCCESS;
}
|
