82 lines
1.8 KiB
C
82 lines
1.8 KiB
C
/** @file
|
|
Key code ring
|
|
|
|
Copyright (c) 2018, vit9696. All rights reserved.<BR>
|
|
This program and the accompanying materials
|
|
are licensed and made available under the terms and conditions of the BSD License
|
|
which accompanies this distribution. The full text of the license may be found at
|
|
http://opensource.org/licenses/bsd-license.php
|
|
|
|
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
|
|
|
|
**/
|
|
|
|
#include "AIKData.h"
|
|
|
|
#include <Library/BaseMemoryLib.h>
|
|
#include <Library/DebugLib.h>
|
|
|
|
VOID
|
|
AIKDataReset (
|
|
IN OUT AIK_DATA *Data
|
|
)
|
|
{
|
|
Data->KeyBufferHead = Data->KeyBufferTail = Data->KeyBuffer;
|
|
Data->KeyBufferSize = 0;
|
|
}
|
|
|
|
BOOLEAN
|
|
AIKDataEmpty (
|
|
IN AIK_DATA *Data
|
|
)
|
|
{
|
|
return Data->KeyBufferSize == 0;
|
|
}
|
|
|
|
EFI_STATUS
|
|
AIKDataReadEntry (
|
|
IN OUT AIK_DATA *Data,
|
|
OUT AMI_EFI_KEY_DATA *KeyData
|
|
)
|
|
{
|
|
if (Data->KeyBufferSize == 0) {
|
|
return EFI_NOT_READY;
|
|
}
|
|
|
|
CopyMem (KeyData, Data->KeyBufferTail, sizeof (*KeyData));
|
|
|
|
Data->KeyBufferSize--;
|
|
Data->KeyBufferTail++;
|
|
if (Data->KeyBufferTail == &Data->KeyBuffer[AIK_DATA_BUFFER_SIZE]) {
|
|
Data->KeyBufferTail = Data->KeyBuffer;
|
|
}
|
|
|
|
return EFI_SUCCESS;
|
|
}
|
|
|
|
VOID
|
|
AIKDataWriteEntry (
|
|
IN OUT AIK_DATA *Data,
|
|
IN AMI_EFI_KEY_DATA *KeyData
|
|
)
|
|
{
|
|
//
|
|
// Eat the first entry if we have no room
|
|
//
|
|
if (Data->KeyBufferSize == AIK_DATA_BUFFER_SIZE) {
|
|
Data->KeyBufferSize--;
|
|
Data->KeyBufferTail++;
|
|
if (Data->KeyBufferTail == &Data->KeyBuffer[AIK_DATA_BUFFER_SIZE]) {
|
|
Data->KeyBufferTail = Data->KeyBuffer;
|
|
}
|
|
}
|
|
|
|
Data->KeyBufferSize++;
|
|
CopyMem (Data->KeyBufferHead, KeyData, sizeof (*KeyData));
|
|
Data->KeyBufferHead++;
|
|
if (Data->KeyBufferHead == &Data->KeyBuffer[AIK_DATA_BUFFER_SIZE]) {
|
|
Data->KeyBufferHead = Data->KeyBuffer;
|
|
}
|
|
}
|