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/** @file
Memory Detection for Virtual Machines.
Copyright (c) 2024 Loongson Technology Corporation Limited. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
//
// 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/MemoryAllocationLib.h>
#include <Library/PcdLib.h>
#include <Library/QemuFwCfgLib.h>
#include <Library/ResourcePublicationLib.h>
#include <Register/LoongArch64/Csr.h>
#include <Uefi/UefiSpec.h>
#include "Platform.h"
#define MAX_VIRTUAL_MEMORY_MAP_DESCRIPTORS (128)
#define LOONGARCH_FW_RAM_TOP BASE_256MB
/**
Publish PEI core memory
@return EFI_SUCCESS The PEIM initialized successfully.
**/
EFI_STATUS
PublishPeiMemory (
VOID
)
{
EFI_STATUS Status;
UINT64 Base;
UINT64 Size;
UINT64 RamTop;
FIRMWARE_CONFIG_ITEM FwCfgItem;
UINTN FwCfgSize;
UINTN Processed;
MEMMAP_ENTRY MemoryMapEntry;
//
// Determine the range of memory to use during PEI
//
Base = FixedPcdGet64 (PcdOvmfSecPeiTempRamBase) + FixedPcdGet32 (PcdOvmfSecPeiTempRamSize);
RamTop = 0;
Status = QemuFwCfgFindFile ("etc/memmap", &FwCfgItem, &FwCfgSize);
if (EFI_ERROR (Status)) {
return Status;
}
if (FwCfgSize % sizeof MemoryMapEntry != 0) {
return EFI_PROTOCOL_ERROR;
}
QemuFwCfgSelectItem (FwCfgItem);
for (Processed = 0; Processed < FwCfgSize; Processed += sizeof MemoryMapEntry) {
QemuFwCfgReadBytes (sizeof MemoryMapEntry, &MemoryMapEntry);
if (MemoryMapEntry.Type != EfiAcpiAddressRangeMemory) {
continue;
}
//
// Find memory map entry where PEI temp stack is located
//
if ((MemoryMapEntry.BaseAddr <= Base) &&
(Base < (MemoryMapEntry.BaseAddr + MemoryMapEntry.Length)))
{
RamTop = MemoryMapEntry.BaseAddr + MemoryMapEntry.Length;
break;
}
}
if (RamTop == 0) {
DEBUG ((DEBUG_ERROR, "ERROR: No memory map entry contains temp stack \n"));
ASSERT (FALSE);
}
Size = RamTop - Base;
//
// Publish this memory to the PEI Core
//
Status = PublishSystemMemory (Base, Size);
ASSERT_EFI_ERROR (Status);
DEBUG ((DEBUG_INFO, "Publish Memory Initialize done.\n"));
return Status;
}
/**
Peform Memory Detection
Publish system RAM and reserve memory regions
**/
VOID
InitializeRamRegions (
VOID
)
{
EFI_STATUS Status;
FIRMWARE_CONFIG_ITEM FwCfgItem;
UINTN FwCfgSize;
MEMMAP_ENTRY MemoryMapEntry;
MEMMAP_ENTRY *StartEntry;
MEMMAP_ENTRY *pEntry;
UINTN Processed;
Status = QemuFwCfgFindFile ("etc/memmap", &FwCfgItem, &FwCfgSize);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_ERROR, "%a %d read etc/memmap error Status %d \n", __func__, __LINE__, Status));
return;
}
if (FwCfgSize % sizeof MemoryMapEntry != 0) {
DEBUG ((DEBUG_ERROR, "no MemoryMapEntry FwCfgSize:%d\n", FwCfgSize));
return;
}
QemuFwCfgSelectItem (FwCfgItem);
StartEntry = AllocatePages (EFI_SIZE_TO_PAGES (FwCfgSize));
QemuFwCfgReadBytes (FwCfgSize, StartEntry);
for (Processed = 0; Processed < (FwCfgSize / sizeof MemoryMapEntry); Processed++) {
pEntry = StartEntry + Processed;
if (pEntry->Length == 0) {
continue;
}
DEBUG ((DEBUG_INFO, "MemmapEntry Base %p length %p type %d\n", pEntry->BaseAddr, pEntry->Length, pEntry->Type));
if (pEntry->Type != EfiAcpiAddressRangeMemory) {
continue;
}
AddMemoryRangeHob (pEntry->BaseAddr, pEntry->BaseAddr + pEntry->Length);
}
//
// When 0 address protection is enabled,
// 0-4k memory needs to be preallocated to prevent UEFI applications from allocating use,
// such as grub
//
if (PcdGet8 (PcdNullPointerDetectionPropertyMask) & BIT0) {
BuildMemoryAllocationHob (
0,
EFI_PAGE_SIZE,
EfiBootServicesData
);
}
}
/**
Gets the Virtual Memory Map of corresponding platforms.
This Virtual Memory Map is used by initialize the MMU on corresponding
platforms.
@param[out] MemoryTable Array of EFI_MEMORY_DESCRIPTOR
describing a Physical-to-Virtual Memory
mapping. This array must be ended by a
zero-filled entry. The allocated memory
will not be freed.
**/
VOID
EFIAPI
GetMemoryMapPolicy (
OUT EFI_MEMORY_DESCRIPTOR **MemoryTable
)
{
EFI_STATUS Status;
FIRMWARE_CONFIG_ITEM FwCfgItem;
UINTN FwCfgSize;
MEMMAP_ENTRY MemoryMapEntry;
MEMMAP_ENTRY *StartEntry;
MEMMAP_ENTRY *pEntry;
UINTN Processed;
EFI_MEMORY_DESCRIPTOR *VirtualMemoryTable;
UINTN Index = 0;
ASSERT (MemoryTable != NULL);
VirtualMemoryTable = AllocatePool (
sizeof (EFI_MEMORY_DESCRIPTOR) *
MAX_VIRTUAL_MEMORY_MAP_DESCRIPTORS
);
//
// Add the 0x10000000-0x20000000. In the virtual machine, this area use for CPU UART, flash, PIC etc.
//
VirtualMemoryTable[Index].PhysicalStart = BASE_256MB;
VirtualMemoryTable[Index].VirtualStart = VirtualMemoryTable[Index].PhysicalStart;
VirtualMemoryTable[Index].NumberOfPages = EFI_SIZE_TO_PAGES (SIZE_256MB);
VirtualMemoryTable[Index].Attribute = EFI_MEMORY_UC;
++Index;
Status = QemuFwCfgFindFile ("etc/memmap", &FwCfgItem, &FwCfgSize);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_ERROR, "%a %d read etc/memmap error Status %d \n", __func__, __LINE__, Status));
ZeroMem (&VirtualMemoryTable[Index], sizeof (EFI_MEMORY_DESCRIPTOR));
*MemoryTable = VirtualMemoryTable;
return;
}
if (FwCfgSize % sizeof MemoryMapEntry != 0) {
DEBUG ((DEBUG_ERROR, "no MemoryMapEntry FwCfgSize:%d\n", FwCfgSize));
}
QemuFwCfgSelectItem (FwCfgItem);
StartEntry = AllocatePages (EFI_SIZE_TO_PAGES (FwCfgSize));
QemuFwCfgReadBytes (FwCfgSize, StartEntry);
for (Processed = 0; Processed < (FwCfgSize / sizeof MemoryMapEntry); Processed++) {
pEntry = StartEntry + Processed;
if (pEntry->Length == 0) {
continue;
}
DEBUG ((DEBUG_INFO, "MemmapEntry Base %p length %p type %d\n", pEntry->BaseAddr, pEntry->Length, pEntry->Type));
VirtualMemoryTable[Index].PhysicalStart = pEntry->BaseAddr;
VirtualMemoryTable[Index].VirtualStart = VirtualMemoryTable[Index].PhysicalStart;
VirtualMemoryTable[Index].NumberOfPages = EFI_SIZE_TO_PAGES (pEntry->Length);
VirtualMemoryTable[Index].Attribute = EFI_MEMORY_WB;
++Index;
}
FreePages (StartEntry, EFI_SIZE_TO_PAGES (FwCfgSize));
// End of Table
ZeroMem (&VirtualMemoryTable[Index], sizeof (EFI_MEMORY_DESCRIPTOR));
*MemoryTable = VirtualMemoryTable;
}
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