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/** @file
The library call to pass the device tree to DXE via HOB.
Copyright (c) 2021, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
//
//// The package level header files this module uses
////
#include <PiPei.h>
#include <Library/DebugLib.h>
#include <Library/HobLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/BaseRiscVSbiLib.h>
#include <Library/PcdLib.h>
#include <Include/Library/PrePiLib.h>
#include <libfdt.h>
#include <Guid/FdtHob.h>
/**
Build memory map I/O range resource HOB using the
base address and size.
@param MemoryBase Memory map I/O base.
@param MemorySize Memory map I/O size.
**/
STATIC
VOID
AddIoMemoryBaseSizeHob (
EFI_PHYSICAL_ADDRESS MemoryBase,
UINT64 MemorySize
)
{
/* Align to EFI_PAGE_SIZE */
MemorySize = ALIGN_VALUE (MemorySize, EFI_PAGE_SIZE);
BuildResourceDescriptorHob (
EFI_RESOURCE_MEMORY_MAPPED_IO,
EFI_RESOURCE_ATTRIBUTE_PRESENT |
EFI_RESOURCE_ATTRIBUTE_INITIALIZED |
EFI_RESOURCE_ATTRIBUTE_UNCACHEABLE |
EFI_RESOURCE_ATTRIBUTE_TESTED,
MemoryBase,
MemorySize
);
}
/**
Populate IO resources from FDT that not added to GCD by its
driver in the DXE phase.
@param FdtBase Fdt base address
@param Compatible Compatible string
**/
STATIC
VOID
PopulateIoResources (
VOID *FdtBase,
CONST CHAR8 *Compatible
)
{
UINT64 *Reg;
INT32 Node, LenP;
Node = fdt_node_offset_by_compatible (FdtBase, -1, Compatible);
while (Node != -FDT_ERR_NOTFOUND) {
Reg = (UINT64 *)fdt_getprop (FdtBase, Node, "reg", &LenP);
if (Reg) {
ASSERT (LenP == (2 * sizeof (UINT64)));
AddIoMemoryBaseSizeHob (SwapBytes64 (Reg[0]), SwapBytes64 (Reg[1]));
}
Node = fdt_node_offset_by_compatible (FdtBase, Node, Compatible);
}
}
/**
@retval EFI_SUCCESS The address of FDT is passed in HOB.
EFI_UNSUPPORTED Can't locate FDT.
**/
EFI_STATUS
EFIAPI
PlatformPeimInitialization (
VOID
)
{
EFI_RISCV_FIRMWARE_CONTEXT *FirmwareContext;
VOID *FdtPointer;
VOID *Base;
VOID *NewBase;
UINTN FdtSize;
UINTN FdtPages;
UINT64 *FdtHobData;
FirmwareContext = NULL;
GetFirmwareContextPointer (&FirmwareContext);
if (FirmwareContext == NULL) {
DEBUG ((DEBUG_ERROR, "%a: Firmware Context is NULL\n", __func__));
return EFI_UNSUPPORTED;
}
FdtPointer = (VOID *)FirmwareContext->FlattenedDeviceTree;
if (FdtPointer == NULL) {
DEBUG ((DEBUG_ERROR, "%a: Invalid FDT pointer\n", __func__));
return EFI_UNSUPPORTED;
}
DEBUG ((DEBUG_INFO, "%a: Build FDT HOB - FDT at address: 0x%x \n", __func__, FdtPointer));
Base = FdtPointer;
if (fdt_check_header (Base) != 0) {
DEBUG ((DEBUG_ERROR, "%a: Corrupted DTB\n", __func__));
return EFI_UNSUPPORTED;
}
FdtSize = fdt_totalsize (Base);
FdtPages = EFI_SIZE_TO_PAGES (FdtSize);
NewBase = AllocatePages (FdtPages);
if (NewBase == NULL) {
DEBUG ((DEBUG_ERROR, "%a: Could not allocate memory for DTB\n", __func__));
return EFI_UNSUPPORTED;
}
fdt_open_into (Base, NewBase, EFI_PAGES_TO_SIZE (FdtPages));
FdtHobData = BuildGuidHob (&gFdtHobGuid, sizeof *FdtHobData);
if (FdtHobData == NULL) {
DEBUG ((DEBUG_ERROR, "%a: Could not build FDT Hob\n", __func__));
return EFI_UNSUPPORTED;
}
*FdtHobData = (UINTN)NewBase;
BuildFvHob (PcdGet32 (PcdOvmfDxeMemFvBase), PcdGet32 (PcdOvmfDxeMemFvSize));
PopulateIoResources (Base, "ns16550a");
PopulateIoResources (Base, "qemu,fw-cfg-mmio");
PopulateIoResources (Base, "virtio,mmio");
return EFI_SUCCESS;
}
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