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05f74f1ca7
Add a serial port hook library in LoongArchVirt named Fdt16550SerialProtHookLib, this library is referenced from ArmVirtPkg. LoongArch QEMU virtual machine uses register of LOONGARCH_CSR_KS1 to transfer serial port base addres from the PEI phase to the DXE phase. BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4584 Cc: Ard Biesheuvel <ardb+tianocore@kernel.org> Cc: Jiewen Yao <jiewen.yao@intel.com> Cc: Jordan Justen <jordan.l.justen@intel.com> Cc: Gerd Hoffmann <kraxel@redhat.com> Cc: Bibo Mao <maobibo@loongson.cn> Cc: Dongyan Qian <qiandongyan@loongson.cn> Signed-off-by: Chao Li <lichao@loongson.cn> Reviewed-by: Bibo Mao <maobibo@loongson.cn> Acked-by: Gerd Hoffmann <kraxel@redhat.com>
53 lines
1.4 KiB
C
53 lines
1.4 KiB
C
/** @file
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PEI Phase Early Platform Hook Library instance for 16550 Uart.
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Copyright (c) 2020 - 2023, Arm Ltd. All rights reserved.<BR>
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Copyright (c) 2024 Loongson Technology Corporation Limited. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Library/BaseLib.h>
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#include <Library/FdtSerialPortAddressLib.h>
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#include <Library/PcdLib.h>
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#include <Library/PlatformHookLib.h>
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#include <Register/LoongArch64/Csr.h>
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/** Platform hook to retrieve the 16550 UART base address from the platform
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Device tree and store it in the reigster LOONGARCH_CSR_KS1.
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@retval RETURN_SUCCESS Success.
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@retval RETURN_INVALID_PARAMETER A parameter was invalid.
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@retval RETURN_NOT_FOUND Serial port information not found.
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**/
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RETURN_STATUS
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EFIAPI
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PlatformHookSerialPortInitialize (
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VOID
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)
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{
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RETURN_STATUS Status;
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VOID *DeviceTreeBase;
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UINT64 SerialConsoleAddress;
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if (PcdGet64 (PcdSerialRegisterBase) != 0) {
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return RETURN_SUCCESS;
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}
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DeviceTreeBase = (VOID *)(UINTN)PcdGet64 (PcdDeviceTreeInitialBaseAddress);
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if (DeviceTreeBase == NULL) {
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return RETURN_NOT_FOUND;
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}
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Status = FdtSerialGetConsolePort (DeviceTreeBase, &SerialConsoleAddress);
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if (RETURN_ERROR (Status)) {
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return Status;
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}
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CsrWrite (LOONGARCH_CSR_KS1, (UINTN)SerialConsoleAddress);
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return RETURN_SUCCESS;
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}
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