blob: 803725c3ce325f783758f2abee6d2443bde2ba17 (
plain)
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
|
/** @file
Platform Hook Library instance for 16550 Uart.
Copyright (c) 2020, ARM Ltd. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Base.h>
#include <Uefi.h>
#include <Pi/PiBootMode.h>
#include <Pi/PiHob.h>
#include <Guid/Early16550UartBaseAddress.h>
#include <Guid/Fdt.h>
#include <Guid/FdtHob.h>
#include <Library/BaseLib.h>
#include <Library/HobLib.h>
#include <Library/PcdLib.h>
#include <Library/PlatformHookLib.h>
/** Platform hook to retrieve the 16550 UART base address from the GUID Hob
that caches the UART base address from early boot stage and store it in
PcdSerialRegisterBase.
@retval RETURN_SUCCESS Success.
@retval RETURN_NOT_FOUND Serial Port information not found.
**/
RETURN_STATUS
EFIAPI
PlatformHookSerialPortInitialize (
VOID
)
{
VOID *Hob;
UINT64 *UartBase;
if (PcdGet64 (PcdSerialRegisterBase) != 0) {
return RETURN_SUCCESS;
}
Hob = GetFirstGuidHob (&gEarly16550UartBaseAddressGuid);
if ((Hob == NULL) || (GET_GUID_HOB_DATA_SIZE (Hob) != sizeof (*UartBase))) {
return RETURN_NOT_FOUND;
}
UartBase = GET_GUID_HOB_DATA (Hob);
if ((UINTN)*UartBase == 0) {
return RETURN_NOT_FOUND;
}
return (RETURN_STATUS)PcdSet64S (PcdSerialRegisterBase, (UINTN)*UartBase);
}
|
