Unit PlatformARMv7L

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Description

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Ultibo Platform interface unit for ARMv7 LPAE

This unit extends the Platform ARMv7 unit to provide support for implementations using the Large Physical Address Extensions (LPAE) to access greater than 4GB of memory in 32-bit environments.

The LPAE defines a new page table descriptor format along with new memory region attributes and memory attribute indirection registers (MAIR0/1) as well as extending the TTBR0, TTBR1 and TTBCR registers with additional information.

The LPAE extensions allow addressing of up to 40 bits of physical address space (1TB) by mapping it into the 32-bit virtual address space.

For 64-bit environments the Platform ARMv8 unit provides the equivalent functionality as LPAE is not required and the processor can address up to 48 bits of address space directly. All functionality not directly related to LPAE is provided from the Platform ARMv7 unit.

Constants

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To be documented

Type definitions

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To be documented

Public variables

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To be documented

Function declarations

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Initialization functions

procedure ARMv7LInit;

Description: To be documented

Note	None documented

ARMv7L platform functions

procedure ARMv7LMMUInit;

Description: To be documented

Note	None documented

procedure ARMv7LPageTableInit;

Description: Initialize the Hardware Page Tables before enabling the MMU

Note	None documented

procedure ARMv7LPageTableGetEntry(Address:PtrUInt; var Entry:TPageTableEntry);

Description: Get and Decode the entry in the Page Table that corresponds to the supplied virtual address

Note	None documented

function ARMv7LPageTableSetEntry(const Entry:TPageTableEntry):LongWord;

Description: Encode and Set an entry in the Page Table that corresponds to the supplied virtual address

Note	None documented

ARMv7L helper functions

procedure ARMv7LStartMMU;

Description: To be documented

Note	None documented

function ARMv7LGetPageTableLevel1(Address:PtrUInt):UInt64;

Description: Get the descriptor for a Level 1 Page Table (1GB)

Note	None documented

function ARMv7LSetPageTableLevel1(Address,TableAddress:PtrUInt; Flags:UInt64):Boolean;

Description: Set the descriptor for a Level 1 Page Table (1GB)

Note	Caller must call ARMv7InvalidateTLB after changes if MMU is enabled

function ARMv7LGetPageTableLevel2(Address:PtrUInt):UInt64;

Description: Get the descriptor for a Level 2 Page Table (2MB)

Note	None documented

function ARMv7LSetPageTableLevel2(Address,TableAddress:PtrUInt; Flags:UInt64):Boolean;

Description: Set the descriptor for a Level 2 Page Table (2MB)

Note	Caller must call ARMv7InvalidateTLB after changes if MMU is enabled

function ARMv7LGetPageTablePage(Address:PtrUInt):UInt64;

Description: Get the descriptor for a Page Table Page (4KB)

Note	None documented

function ARMv7LSetPageTablePage(Address:PtrUInt; PhysicalRange:LongWord; PhysicalAddress:PtrUInt; Flags:UInt64):Boolean;

Description: Set the descriptor for a Page Table Page (4KB)

Note	Caller must call ARMv7InvalidateTLB after changes if MMU is enabled

function ARMv7LGetPageTableSection(Address:PtrUInt):UInt64;

Description: Get the descriptor for a Page Table Section (2MB)

Note	None documented

function ARMv7LSetPageTableSection(Address:PtrUInt; PhysicalRange:LongWord; PhysicalAddress:PtrUInt; Flags:UInt64):Boolean;

Description: Set the descriptor for a Page Table Section (2MB)

Note	Caller must call ARMv7InvalidateTLB after changes if MMU is enabled

function ARMv7LGetPageTableLargeSection(Address:PtrUInt):UInt64;

Description: Get the descriptor for a Page Table Large Section (1GB)

Note	None documented

function ARMv7LSetPageTableLargeSection(Address:PtrUInt; PhysicalRange:LongWord; PhysicalAddress:PtrUInt; Flags:UInt64):Boolean;

Description: Set the descriptor for a Page Table Large Section (1GB)

Note	Caller must call ARMv7InvalidateTLB after changes if MMU is enabled

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