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/** @file
Memory Detection for Virtual Machines.
Copyright (c) 2021, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
Module Name:
MemDetect.c
**/
//
// The package level header files this module uses
//
#include <PiPei.h>
//
// The Library classes this module consumes
//
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/HobLib.h>
#include <Library/IoLib.h>
#include <Library/PcdLib.h>
#include <Library/PeimEntryPoint.h>
#include <Library/ResourcePublicationLib.h>
#include <Library/BaseRiscVSbiLib.h>
#include <Register/RiscV64/RiscVEncoding.h>
#include <Library/PrePiLib.h>
#include <libfdt.h>
#include <Guid/FdtHob.h>
VOID
BuildMemoryTypeInformationHob (
VOID
);
/**
Build reserved memory range resource HOB.
@param MemoryBase Reserved memory range base address.
@param MemorySize Reserved memory range size.
**/
STATIC
VOID
AddReservedMemoryBaseSizeHob (
EFI_PHYSICAL_ADDRESS MemoryBase,
UINT64 MemorySize
)
{
BuildResourceDescriptorHob (
EFI_RESOURCE_MEMORY_RESERVED,
EFI_RESOURCE_ATTRIBUTE_PRESENT |
EFI_RESOURCE_ATTRIBUTE_INITIALIZED |
EFI_RESOURCE_ATTRIBUTE_UNCACHEABLE |
EFI_RESOURCE_ATTRIBUTE_TESTED,
MemoryBase,
MemorySize
);
}
/**
Create memory range resource HOB using the memory base
address and size.
@param MemoryBase Memory range base address.
@param MemorySize Memory range size.
**/
STATIC
VOID
AddMemoryBaseSizeHob (
EFI_PHYSICAL_ADDRESS MemoryBase,
UINT64 MemorySize
)
{
BuildResourceDescriptorHob (
EFI_RESOURCE_SYSTEM_MEMORY,
EFI_RESOURCE_ATTRIBUTE_PRESENT |
EFI_RESOURCE_ATTRIBUTE_INITIALIZED |
EFI_RESOURCE_ATTRIBUTE_UNCACHEABLE |
EFI_RESOURCE_ATTRIBUTE_WRITE_COMBINEABLE |
EFI_RESOURCE_ATTRIBUTE_WRITE_THROUGH_CACHEABLE |
EFI_RESOURCE_ATTRIBUTE_WRITE_BACK_CACHEABLE |
EFI_RESOURCE_ATTRIBUTE_TESTED,
MemoryBase,
MemorySize
);
}
/**
Create memory range resource HOB using memory base
address and top address of the memory range.
@param MemoryBase Memory range base address.
@param MemoryLimit Memory range size.
**/
STATIC
VOID
AddMemoryRangeHob (
EFI_PHYSICAL_ADDRESS MemoryBase,
EFI_PHYSICAL_ADDRESS MemoryLimit
)
{
AddMemoryBaseSizeHob (MemoryBase, (UINT64)(MemoryLimit - MemoryBase));
}
/**
Configure MMU
**/
STATIC
VOID
InitMmu (
)
{
//
// Set supervisor translation mode to Bare mode
//
RiscVSetSupervisorAddressTranslationRegister ((UINT64)SATP_MODE_OFF << 60);
DEBUG ((DEBUG_INFO, "%a: Set Supervisor address mode to bare-metal mode.\n", __FUNCTION__));
}
/**
Publish system RAM and reserve memory regions.
**/
STATIC
VOID
InitializeRamRegions (
EFI_PHYSICAL_ADDRESS SystemMemoryBase,
UINT64 SystemMemorySize,
EFI_PHYSICAL_ADDRESS MmodeResvBase,
UINT64 MmodeResvSize
)
{
/*
* M-mode FW can be loaded anywhere in memory but should not overlap
* with the EDK2. This can happen if some other boot code loads the
* M-mode firmware.
*
* The M-mode firmware memory should be marked as reserved memory
* so that OS doesn't use it.
*/
DEBUG ((
DEBUG_INFO,
"%a: M-mode FW Memory Start:0x%lx End:0x%lx\n",
__FUNCTION__,
MmodeResvBase,
MmodeResvBase + MmodeResvSize
));
AddReservedMemoryBaseSizeHob (MmodeResvBase, MmodeResvSize);
if (MmodeResvBase > SystemMemoryBase) {
AddMemoryRangeHob (SystemMemoryBase, MmodeResvBase);
}
AddMemoryRangeHob (
MmodeResvBase + MmodeResvSize,
SystemMemoryBase + SystemMemorySize
);
}
/**
Initialize memory hob based on the DTB information.
@return EFI_SUCCESS The memory hob added successfully.
**/
EFI_STATUS
MemoryPeimInitialization (
VOID
)
{
EFI_RISCV_FIRMWARE_CONTEXT *FirmwareContext;
CONST UINT64 *RegProp;
CONST CHAR8 *Type;
UINT64 CurBase, CurSize;
INT32 Node, Prev;
INT32 Len;
VOID *FdtPointer;
EFI_PHYSICAL_ADDRESS MmodeResvBase;
UINT64 MmodeResvSize;
FirmwareContext = NULL;
GetFirmwareContextPointer (&FirmwareContext);
if (FirmwareContext == NULL) {
DEBUG ((DEBUG_ERROR, "%a: Firmware Context is NULL\n", __FUNCTION__));
return EFI_UNSUPPORTED;
}
FdtPointer = (VOID *)FirmwareContext->FlattenedDeviceTree;
if (FdtPointer == NULL) {
DEBUG ((DEBUG_ERROR, "%a: Invalid FDT pointer\n", __FUNCTION__));
return EFI_UNSUPPORTED;
}
/* try to locate the reserved memory opensbi node */
Node = fdt_path_offset (FdtPointer, "/reserved-memory/mmode_resv0");
if (Node >= 0) {
RegProp = fdt_getprop (FdtPointer, Node, "reg", &Len);
if ((RegProp != 0) && (Len == (2 * sizeof (UINT64)))) {
MmodeResvBase = fdt64_to_cpu (ReadUnaligned64 (RegProp));
MmodeResvSize = fdt64_to_cpu (ReadUnaligned64 (RegProp + 1));
}
}
// Look for the lowest memory node
for (Prev = 0; ; Prev = Node) {
Node = fdt_next_node (FdtPointer, Prev, NULL);
if (Node < 0) {
break;
}
// Check for memory node
Type = fdt_getprop (FdtPointer, Node, "device_type", &Len);
if (Type && (AsciiStrnCmp (Type, "memory", Len) == 0)) {
// Get the 'reg' property of this node. For now, we will assume
// two 8 byte quantities for base and size, respectively.
RegProp = fdt_getprop (FdtPointer, Node, "reg", &Len);
if ((RegProp != 0) && (Len == (2 * sizeof (UINT64)))) {
CurBase = fdt64_to_cpu (ReadUnaligned64 (RegProp));
CurSize = fdt64_to_cpu (ReadUnaligned64 (RegProp + 1));
DEBUG ((
DEBUG_INFO,
"%a: System RAM @ 0x%lx - 0x%lx\n",
__FUNCTION__,
CurBase,
CurBase + CurSize - 1
));
if ((MmodeResvBase >= CurBase) && ((MmodeResvBase + MmodeResvSize) <= (CurBase + CurSize))) {
InitializeRamRegions (
CurBase,
CurSize,
MmodeResvBase,
MmodeResvSize
);
} else {
AddMemoryBaseSizeHob (CurBase, CurSize);
}
} else {
DEBUG ((
DEBUG_ERROR,
"%a: Failed to parse FDT memory node\n",
__FUNCTION__
));
}
}
}
InitMmu ();
BuildMemoryTypeInformationHob ();
return EFI_SUCCESS;
}
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