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/** @file
A sample PRM Module implementation. This PRM Module provides 3 PRM handlers that simply take a DEBUG print
function from the OS and invoke it with a debug message internal the PRM handler.
Copyright (c) Microsoft Corporation
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <PrmModule.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/PrintLib.h>
#include <Library/UefiLib.h>
//
// PRM Handler GUIDs
//
// {149a5cb3-6a9c-403f-940a-156abf63938a}
#define PRM_HANDLER_1_GUID {0x149a5cb3, 0x6a9c, 0x403f, {0x94, 0x0a, 0x15, 0x6a, 0xbf, 0x63, 0x93, 0x8a}}
// Note: If the signature size is modified, the PRM Handler test code in this module needs to be updated.
#define MEMORY_ALLOCATION_TEST_DATA_SIGNATURE SIGNATURE_32('T','E','S','T')
#define MEMORY_ALLOCATION_TEST_DATA_SIZE sizeof(UINT32)
#define MEMORY_ALLOCATION_TEST_DATA_BUFFER_SIZE 256
/**
A sample Platform Runtime Mechanism (PRM) handler.
This sample handler currently uses the OS_SERVICES to write a debug message
indicating this is PRM handler 1.
@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.
**/
EFI_STATUS
PRM_EXPORT_API
EFIAPI
PrmHandler1 (
IN VOID *ParameterBuffer,
IN PRM_CONTEXT_BUFFER *ContextBUffer
)
{
EFI_STATUS Status;
UINTN Index;
VOID *NonPagedPool;
CHAR8 DebugMessage[256];
if (OsServices == NULL || OsServices->DebugPrint == NULL || OsServices->AllocateMemory == NULL) {
return EFI_INVALID_PARAMETER;
}
OsServices->DebugPrint ("Memory Allocation PrmHandler1 entry.\n");
OsServices->DebugPrint (" Requesting allocation of a 256 byte non-paged pool...\n");
NonPagedPool = NULL;
NonPagedPool = OsServices->AllocateMemory (MEMORY_ALLOCATION_TEST_DATA_BUFFER_SIZE, FALSE);
if (NonPagedPool == NULL) {
OsServices->DebugPrint (" NULL was returned from AllocateMemory()...\n");
return EFI_OUT_OF_RESOURCES;
}
AsciiSPrint (
&DebugMessage[0],
ARRAY_SIZE (DebugMessage),
" Buffer address returned from AllocateMemory() = 0x%016lx.\n",
(UINTN) NonPagedPool
);
OsServices->DebugPrint (&DebugMessage[0]);
// Write the test data
OsServices->DebugPrint (" Beginning memory buffer write and read back test...\n");
SetMem32 (NonPagedPool, MEMORY_ALLOCATION_TEST_DATA_BUFFER_SIZE, MEMORY_ALLOCATION_TEST_DATA_SIGNATURE);
// Read back and verify the test data is valid
for (Index = 0, Status = EFI_SUCCESS; Index < (MEMORY_ALLOCATION_TEST_DATA_BUFFER_SIZE / MEMORY_ALLOCATION_TEST_DATA_SIZE); Index++) {
if (((UINT32 *) NonPagedPool)[Index] != MEMORY_ALLOCATION_TEST_DATA_SIGNATURE) {
Status = EFI_DEVICE_ERROR;
break;
}
}
if (EFI_ERROR (Status)) {
OsServices->DebugPrint (" Memory write & read test failed.\n");
} else {
OsServices->DebugPrint (" Memory write & read test passed.\n");
}
OsServices->DebugPrint ("Memory Allocation PrmHandler1 exit.\n");
return EFI_SUCCESS;
}
//
// Register the PRM export information for this PRM Module
//
PRM_MODULE_EXPORT (
PRM_HANDLER_EXPORT_ENTRY (PRM_HANDLER_1_GUID, PrmHandler1)
);
EFI_STATUS
EFIAPI
PrmSampleMemoryAllocationModuleInit (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
return EFI_SUCCESS;
}
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