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/** @file
*
* Copyright (c) 2019, Pete Batard <pete@akeo.ie>
* Copyright (c) 2017-2018, Andrey Warkentin <andrey.warkentin@gmail.com>
* Copyright (c) 2014, Linaro Limited. All rights reserved.
* Copyright (c) 2013-2018, ARM Limited. All rights reserved.
*
* SPDX-License-Identifier: BSD-2-Clause-Patent
*
**/
#include <Library/ArmPlatformLib.h>
#include <Library/DebugLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/PcdLib.h>
#include <Library/RPiMem.h>
#include <IndustryStandard/Bcm2711.h>
#include <IndustryStandard/Bcm2836.h>
UINT64 mSystemMemoryBase;
extern UINT64 mSystemMemoryEnd;
UINT64 mVideoCoreBase;
UINT64 mVideoCoreSize;
UINT32 mBoardRevision;
// The total number of descriptors, including the final "end-of-table" descriptor.
#define MAX_VIRTUAL_MEMORY_MAP_DESCRIPTORS 11
STATIC BOOLEAN VirtualMemoryInfoInitialized = FALSE;
STATIC RPI_MEMORY_REGION_INFO VirtualMemoryInfo[MAX_VIRTUAL_MEMORY_MAP_DESCRIPTORS];
#define VariablesBase (FixedPcdGet32(PcdNvStorageVariableBase))
/**
Return the Virtual Memory Map of your platform
This Virtual Memory Map is used by MemoryInitPei Module to initialize the MMU
on your platform.
@param[out] VirtualMemoryMap Array of ARM_MEMORY_REGION_DESCRIPTOR
describing a Physical-to-Virtual Memory
mapping. This array must be ended by a
zero-filled entry
**/
VOID
ArmPlatformGetVirtualMemoryMap (
IN ARM_MEMORY_REGION_DESCRIPTOR** VirtualMemoryMap
)
{
UINTN Index = 0;
INT64 TotalMemorySize;
INT64 MemorySizeBelow3GB;
INT64 MemorySizeBelow4GB;
ARM_MEMORY_REGION_DESCRIPTOR *VirtualMemoryTable;
// Early output of the info we got from VideoCore can prove valuable.
DEBUG ((DEBUG_INFO, "Board Rev: 0x%lX\n", mBoardRevision));
DEBUG ((DEBUG_INFO, "RAM < 1GB: 0x%ll08X (Size 0x%ll08X)\n", mSystemMemoryBase, mSystemMemoryEnd + 1));
DEBUG ((DEBUG_INFO, "VideoCore: 0x%ll08X (Size 0x%ll08X)\n", mVideoCoreBase, mVideoCoreSize));
ASSERT (mSystemMemoryBase == 0);
ASSERT (VirtualMemoryMap != NULL);
// Compute the total RAM size available on this platform
TotalMemorySize = SIZE_256MB;
TotalMemorySize <<= (mBoardRevision >> 20) & 0x07;
DEBUG ((DEBUG_INFO, "Total RAM: 0x%ll08X\n", TotalMemorySize));
//
// Ensure that what we declare as System Memory doesn't overlap with the
// SoC MMIO registers. This can be achieved through a MIN () with the
// base address since SystemMemoryBase is 0 (we assert if it isn't).
//
ASSERT (BCM2836_SOC_REGISTERS < 4UL * SIZE_1GB);
MemorySizeBelow4GB = MIN(TotalMemorySize, 4UL * SIZE_1GB);
MemorySizeBelow4GB = MIN(MemorySizeBelow4GB, BCM2836_SOC_REGISTERS);
if (BCM2711_SOC_REGISTERS > 0) {
ASSERT (BCM2836_SOC_REGISTERS < 4UL * SIZE_1GB);
MemorySizeBelow4GB = MIN(MemorySizeBelow4GB, BCM2711_SOC_REGISTERS);
}
//
// By default we limit the memory to 3 GB to work around OS support for
// DMA bugs in the SoC, for OSes that don't support _DMA range descriptors.
// On boards with more RAM (4GB, 8GB), the extra memory is added by ConfigDxe
// provided the configuration setting for 3GB limit is off.
//
MemorySizeBelow3GB = MIN(MemorySizeBelow4GB, 3UL * SIZE_1GB);
//
// On Pi 3 we've seen SoC registers may overlap the reported VideoCore range,
// so clamp that down as well.
//
if (mVideoCoreBase + mVideoCoreSize > BCM2836_SOC_REGISTERS) {
mVideoCoreSize = BCM2836_SOC_REGISTERS - mVideoCoreBase;
DEBUG ((DEBUG_WARN, "VideoCore range overlapped SoC MMIO, now 0x%ll08X (Size 0x%ll08X)\n",
mVideoCoreBase, mVideoCoreSize));
}
VirtualMemoryTable = (ARM_MEMORY_REGION_DESCRIPTOR*)AllocatePages
(EFI_SIZE_TO_PAGES (sizeof (ARM_MEMORY_REGION_DESCRIPTOR) *
MAX_VIRTUAL_MEMORY_MAP_DESCRIPTORS));
if (VirtualMemoryTable == NULL) {
return;
}
// Firmware Volume
VirtualMemoryTable[Index].PhysicalBase = FixedPcdGet64 (PcdFdBaseAddress);
VirtualMemoryTable[Index].VirtualBase = VirtualMemoryTable[Index].PhysicalBase;
VirtualMemoryTable[Index].Length = VariablesBase - VirtualMemoryTable[Index].PhysicalBase;
VirtualMemoryTable[Index].Attributes = ARM_MEMORY_REGION_ATTRIBUTE_WRITE_BACK;
VirtualMemoryInfo[Index].Type = RPI_MEM_RESERVED_REGION;
VirtualMemoryInfo[Index++].Name = L"FD";
// Variable Volume
VirtualMemoryTable[Index].PhysicalBase = VariablesBase;
VirtualMemoryTable[Index].VirtualBase = VirtualMemoryTable[Index].PhysicalBase;
VirtualMemoryTable[Index].Length = FixedPcdGet32 (PcdFdtBaseAddress) - VariablesBase;
VirtualMemoryTable[Index].Attributes = ARM_MEMORY_REGION_ATTRIBUTE_WRITE_BACK;
VirtualMemoryInfo[Index].Type = RPI_MEM_RUNTIME_REGION;
VirtualMemoryInfo[Index++].Name = L"FD Variables";
//
// Both the the Pi 4 and Pi 3 implementations expect the DTB to directly follow the FD.
//
VirtualMemoryTable[Index].PhysicalBase = FixedPcdGet32 (PcdFdtBaseAddress);
VirtualMemoryTable[Index].VirtualBase = VirtualMemoryTable[Index].PhysicalBase;
VirtualMemoryTable[Index].Length = FixedPcdGet32 (PcdFdtSize);;
VirtualMemoryTable[Index].Attributes = ARM_MEMORY_REGION_ATTRIBUTE_WRITE_BACK;
VirtualMemoryInfo[Index].Type = RPI_MEM_RESERVED_REGION;
VirtualMemoryInfo[Index++].Name = L"Flattened Device Tree";
if (BCM2711_SOC_REGISTERS == 0) {
//
// TF-A reserved RAM only exists for the Pi 3 TF-A.
//
// This is 2MB that directly follows the FD.
//
VirtualMemoryTable[Index].PhysicalBase = (FixedPcdGet64(PcdFdBaseAddress) + FixedPcdGet32(PcdFdSize));
VirtualMemoryTable[Index].VirtualBase = VirtualMemoryTable[Index].PhysicalBase;
VirtualMemoryTable[Index].Length = FixedPcdGet64 (PcdSystemMemoryBase) - VirtualMemoryTable[Index].PhysicalBase;
VirtualMemoryTable[Index].Attributes = ARM_MEMORY_REGION_ATTRIBUTE_WRITE_BACK;
VirtualMemoryInfo[Index].Type = RPI_MEM_RESERVED_REGION;
VirtualMemoryInfo[Index++].Name = L"TF-A RAM";
}
// Base System RAM
VirtualMemoryTable[Index].PhysicalBase = FixedPcdGet64 (PcdSystemMemoryBase);
VirtualMemoryTable[Index].VirtualBase = VirtualMemoryTable[Index].PhysicalBase;
VirtualMemoryTable[Index].Length = mSystemMemoryEnd + 1 - FixedPcdGet64 (PcdSystemMemoryBase);
VirtualMemoryTable[Index].Attributes = ARM_MEMORY_REGION_ATTRIBUTE_WRITE_BACK;
VirtualMemoryInfo[Index].Type = RPI_MEM_BASIC_REGION;
VirtualMemoryInfo[Index++].Name = L"System RAM < 1GB";
// GPU Reserved
VirtualMemoryTable[Index].PhysicalBase = mVideoCoreBase;
VirtualMemoryTable[Index].VirtualBase = VirtualMemoryTable[Index].PhysicalBase;
VirtualMemoryTable[Index].Length = mVideoCoreSize;
VirtualMemoryTable[Index].Attributes = ARM_MEMORY_REGION_ATTRIBUTE_DEVICE;
VirtualMemoryInfo[Index].Type = RPI_MEM_UNMAPPED_REGION;
VirtualMemoryInfo[Index++].Name = L"GPU Reserved";
// Extended SoC registers (PCIe, genet, ...)
if (BCM2711_SOC_REGISTERS > 0) {
VirtualMemoryTable[Index].PhysicalBase = BCM2711_SOC_REGISTERS;
VirtualMemoryTable[Index].VirtualBase = VirtualMemoryTable[Index].PhysicalBase;
VirtualMemoryTable[Index].Length = BCM2711_SOC_REGISTER_LENGTH;
VirtualMemoryTable[Index].Attributes = ARM_MEMORY_REGION_ATTRIBUTE_DEVICE;
VirtualMemoryInfo[Index].Type = RPI_MEM_UNMAPPED_REGION;
VirtualMemoryInfo[Index++].Name = L"SoC Reserved (27xx)";
}
// Base SoC registers
VirtualMemoryTable[Index].PhysicalBase = BCM2836_SOC_REGISTERS;
VirtualMemoryTable[Index].VirtualBase = VirtualMemoryTable[Index].PhysicalBase;
VirtualMemoryTable[Index].Length = BCM2836_SOC_REGISTER_LENGTH;
VirtualMemoryTable[Index].Attributes = ARM_MEMORY_REGION_ATTRIBUTE_DEVICE;
VirtualMemoryInfo[Index].Type = RPI_MEM_UNMAPPED_REGION;
VirtualMemoryInfo[Index++].Name = L"SoC Reserved (283x)";
// Memory in the 1GB - 3GB range is always available.
if (MemorySizeBelow3GB > SIZE_1GB) {
VirtualMemoryTable[Index].PhysicalBase = SIZE_1GB;
VirtualMemoryTable[Index].VirtualBase = VirtualMemoryTable[Index].PhysicalBase;
VirtualMemoryTable[Index].Length = MemorySizeBelow3GB - VirtualMemoryTable[Index].PhysicalBase;
VirtualMemoryTable[Index].Attributes = ARM_MEMORY_REGION_ATTRIBUTE_WRITE_BACK;
VirtualMemoryInfo[Index].Type = RPI_MEM_BASIC_REGION;
VirtualMemoryInfo[Index++].Name = L"Extended System RAM < 3GB";
}
//
// If we have RAM in the 3GB - 4GB range, declare it as mapped, but don't
// add it to the memory map. This is done later by ConfigDxe if necessary.
//
if (MemorySizeBelow4GB > 3UL * SIZE_1GB) {
VirtualMemoryTable[Index].PhysicalBase = 3UL * SIZE_1GB;
VirtualMemoryTable[Index].VirtualBase = VirtualMemoryTable[Index].PhysicalBase;
VirtualMemoryTable[Index].Length = MemorySizeBelow4GB - VirtualMemoryTable[Index].PhysicalBase;
VirtualMemoryTable[Index].Attributes = ARM_MEMORY_REGION_ATTRIBUTE_WRITE_BACK;
VirtualMemoryInfo[Index].Type = RPI_MEM_UNMAPPED_REGION;
VirtualMemoryInfo[Index++].Name = L"Extended System RAM < 4GB";
}
// Same treatment for the memory above 4GB.
if (TotalMemorySize > 4UL * SIZE_1GB) {
VirtualMemoryTable[Index].PhysicalBase = 4UL * SIZE_1GB;
VirtualMemoryTable[Index].VirtualBase = VirtualMemoryTable[Index].PhysicalBase;
VirtualMemoryTable[Index].Length = TotalMemorySize - VirtualMemoryTable[Index].PhysicalBase;
VirtualMemoryTable[Index].Attributes = ARM_MEMORY_REGION_ATTRIBUTE_WRITE_BACK;
VirtualMemoryInfo[Index].Type = RPI_MEM_UNMAPPED_REGION;
VirtualMemoryInfo[Index++].Name = L"Extended System RAM >= 4GB";
}
// End of Table
VirtualMemoryTable[Index].PhysicalBase = 0;
VirtualMemoryTable[Index].VirtualBase = 0;
VirtualMemoryTable[Index].Length = 0;
VirtualMemoryTable[Index++].Attributes = (ARM_MEMORY_REGION_ATTRIBUTES)0;
ASSERT(Index <= MAX_VIRTUAL_MEMORY_MAP_DESCRIPTORS);
*VirtualMemoryMap = VirtualMemoryTable;
VirtualMemoryInfoInitialized = TRUE;
}
/**
Return additional memory info not populated by the above call.
This call should follow the one to ArmPlatformGetVirtualMemoryMap ().
**/
VOID
RpiPlatformGetVirtualMemoryInfo (
IN RPI_MEMORY_REGION_INFO** MemoryInfo
)
{
ASSERT (VirtualMemoryInfo != NULL);
if (!VirtualMemoryInfoInitialized) {
DEBUG ((DEBUG_ERROR,
"ArmPlatformGetVirtualMemoryMap must be called before RpiPlatformGetVirtualMemoryInfo.\n"));
return;
}
*MemoryInfo = VirtualMemoryInfo;
}
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