Difference between revisions of "Unit PlatformAARCH64"

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'''Ultibo Platform interface unit for AARCH64 (ARM64)'''
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'''Ultibo Platform Interface unit for AARCH64 (ARM64)'''
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''To be documented''
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=== Constants ===
 
=== Constants ===

Revision as of 06:12, 31 August 2021

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Description

Ultibo Platform Interface unit for AARCH64 (ARM64)

Constants


ARM boot tag ATAG_*
ATAG_NONE = $00000000;  
ATAG_CORE = $54410001;  
ATAG_MEM = $54410002;  
ATAG_VIDEOTEXT = $54410003;  
ATAG_RAMDISK = $54410004;  
ATAG_INITRD2 = $54410005;  
ATAG_SERIAL = $54410006;  
ATAG_REVISION = $54410007;  
ATAG_VIDEOLFB = $54410008;  
ATAG_CMDLINE = $54410009;  
 
ARMTAGS_INITIAL = $FFFFFFFF;  


Device tree blob DTB_*
DTB_SIGNATURE = $d00dfeed; See: https://www.kernel.org/doc/Documentation/arm/Booting


ARM machine type ARM_MACHINE_*
ARM_MACHINE_VERSATILE_PB = $00000183;  
ARM_MACHINE_BCM2708 = $00000C42;  
ARM_MACHINE_BCM2709 = $00000C42; BCM2709 uses the same Machine Type as BCM2708
ARM_MACHINE_BCM2710 = $00000C42; BCM2710 uses the same Machine Type as BCM2708
ARM_MACHINE_BCM2711 = $00000C42; BCM2711 uses the same Machine Type as BCM2708


Type definitions


ARM boot tag header

PARMTagHeader = ^TARMTagHeader;

TARMTagHeader = record

Note: ARM Boot Tag Structure Definitions
Size:LongWord; Size of tag, in words (32bit), including the header
Tag:LongWord; One of the ATAG_* values from above

ARM tag core

PARMTagCore = ^TARMTagCore;

TARMTagCore = record

Note: Core parameters (ATAG_CORE)
Flags:LongWord; Bit 0 = read-only
PageSize:LongWord; Systems page size (usually 4k)
RootDev:LongWord; Root device number

ARM tag memory

PARMTagMemory = ^TARMTagMemory;

TARMTagMemory = record

Note: Description of memory region (ATAG_MEM)
Size:LongWord;  
Start:LongWord;  

ARM tag video text

PARMTagVideoText = ^TARMTagVideoText;

TARMTagVideoText = record

Note: Description of VGA text type displays (ATAG_VIDEOTEXT)
X:Byte; Width of display
Y:Byte; Height of display
Video_page:Word;  
Video_mode:Byte;  
Video_cols:Byte;  
Video_ega_bx:Word;  
Video_lines:Byte;  
Video_isvga:Byte;  
Video_points:Word;  

ARM tag ramdisk

PARMTagRamdisk = ^TARMTagRamdisk;

TARMTagRamdisk = record

Note: Description of how the ramdisk will be used by the kernel (ATAG_RAMDISK)
Flags:LongWord; Bit 0 = load, Bit 1 = prompt
Size:LongWord; Decompressed ramdisk size in _kilo_ bytes
Start:LongWord; Starting block of floppy-based RAM disk image

ARM tag initialize ramdisk

PARMTagInitRd2 = ^TARMTagInitRd2;

TARMTagInitRd2 = record

Note: Description of the physical location of the compressed ramdisk image (ATAG_INITRD2)
Start:LongWord; Physical start address
Size:LongWord; Size of compressed ramdisk image in bytes

ARM tag serial

PARMTagSerial = ^TARMTagSerial;

TARMTagSerial = record

Note: Board serial number (ATAG_SERIAL)
Low:LongWord;  
High:LongWord;  

ARM tag revision

PARMTagRevision = ^TARMTagRevision;

TARMTagRevision = record

Note: Board revision (ATAG_REVISION)
Revision:LongWord;  

ARM tag video framebuffer

PARMTagVideoFB = ^TARMTagVideoFB;

TARMTagVideoFB = record

Note: Description of the parameters for a linear framebuffer type display (ATAG_VIDEOLFB)
Lfb_width:Word;  
Lfb_height:Word;  
Lfb_depth:Word;  
Lfb_linelength:Word;  
Lfb_base:LongWord;  
Lfb_size:LongWord;  
Red_size:Byte;  
Red_pos:Byte;  
Green_size:Byte;  
Green_pos:Byte;  
Blue_size:Byte;  
Blue_pos:Byte;  
Rsvd_size:Byte;  
Rsvd_pos:Byte;  

ARM tag command

PARMTagCommand = ^TARMTagCommand;

TARMTagCommand = record

Note: Commandline for the kernel (ATAG_CMDLINE)
Cmdline:array[0..0] of Char; This is the minimum size

ARM boot tag

PARMTag = ^TARMTag;

TARMTag = record

Note: Format of ARM Boot Tag
Header:TARMTagHeader;  
case Integer of  
0:(Core:TARMTagCore);  
1:(Memory:TARMTagMemory);  
2:(VideoText:TARMTagVideoText);  
3:(Ramdisk:TARMTagRamdisk);  
4:(InitRd2:TARMTagInitRd2);  
5:(Serial:TARMTagSerial);  
6:(Revision:TARMTagRevision);  
7:(VideoFB:TARMTagVideoFB);  
8:(Command:TARMTagCommand)  

AARCH64 wait

TAARCH64Wait = procedure;

AARCH64 long wait

TAARCH64LongWait = procedure;

AARCH64 short wait

TAARCH64ShortWait = procedure;

AARCH64 slow blink

TAARCH64SlowBlink = procedure;

AARCH64 fast blink

TAARCH64FastBlink = procedure;


Public variables


AARCH64 specific variables

AARCH64Initialized:Boolean;
AARCH64BootMode:LongWord = 0; The ARM Mode that the processor was in at boot time (Set by Startup)
AARCH64BootVectors:LongWord = 0; The Vector Base Address that was current at boot time (Set by Startup)
AARCH64TagsAddress:PtrUInt = ARMTAGS_INITIAL Pointer to the ARM TAGS provided by the bootloader at startup (Set by Startup)
AARCH64MachineType:LongWord = 0; ARM Machine Type provided by the bootloader at startup (Set by Startup)
AARCH64SecureBoot:LongWord = 1; If 1 then startup will attempt to switch back to secure world during boot process (If supported by the AARCH64 boot stub)
AARCH64EmulatorMode:LongWord = 0; If 1 then startup detected that the machine is running in an emulator (If applicable)

Note: These variables must be initialized to remain in .data or else they are rewritten to zero with .bss

ARM tags

ARMTagsCount:LongWord; Number of ARM Tags found during parse

Tag none

TagNoneCount:LongWord; Number of ARM NONE Tags found during parse

Tag core

TagCoreCount:LongWord; Number of ARM CORE Tags found during parse
TagCoreFlags:LongWord;
TagCorePageSize:LongWord;
TagCoreRootDevice:LongWord;

Tag memory

TagMemoryCount:LongWord; Number of ARM MEM Tags found during parse
TagMemorySize:LongWord; Size of the last block reported by ARM Tags
TagMemoryStart:LongWord; Start of the last block reported by ARM Tags
TagMemoryLength:LongWord; Adjusted Size of the last block reported by ARM Tags
TagMemoryAddress:PtrUInt; Adjusted Address of the last block reported by ARM Tags

Tag video text

TagVideoTextCount:LongWord; Number of ARM VIDEOTEXT Tags found during parse

Tag ramdisk

TagRamdiskCount:LongWord; Number of ARM RAMDISK Tags found during parse

Tag initialize RD2

TagInitRd2Count:LongWord; Number of ARM INITRD2 Tags found during parse

Tag serial

TagSerialCount:LongWord; Number of ARM SERIAL Tags found during parse
TagSerialNoLow:LongWord;
TagSerialNoHigh:LongWord;

Tag revision

TagRevisionCount:LongWord; Number of ARM REVISION Tags found during parse
TagRevisionNo:LongWord;

Tag video framebuffer

TagVideoFBCount:LongWord; Number of ARM VIDEOLFB Tags found during parse

Tag command

TagCmdCount:LongWord; Number of ARM CMDLINE Tags found during parse
TagCommandSize:LongWord; Length of the command line in characters (Including null terminator)
TagCommandCount:LongInt; Count of parameters (space delimited) in the command line
TagCommandAddress:PChar; Pointer to the start of the command line

Wait handlers

AARCH64WaitHandler:TAARCH64Wait;
AARCH64LongWaitHandler:TAARCH64LongWait;
AARCH64ShortWaitHandler:TAARCH64ShortWait;

Blink handlers

AARCH64SlowBlinkHandler:TAARCH64SlowBlink;
AARCH64FastBlinkHandler:TAARCH64FastBlink;


Function declarations


Initialization functions 

procedure AARCH64Init;
Description: To be documented
Note None documented


AARCH64 platform functions 

procedure AARCH64ParseBootTags;
Description: Extract some information from the ARM boot tag list and use it to load the memory manager, some other information is stored in variables for future use
Note None documented 


procedure AARCH64ParseCommandLine;
Description: Setup argc, argv and cmdline and process known command line options
Note None documented 


procedure AARCH64ParseEnvironment;
Description: Setup envp and process known environment options
Note None documented 


function AARCH64GetSP:PtrUInt; assembler; nostackframe;
Description: Get the current stack pointer (SP)
Note None documented 


function AARCH64GetPC:PtrUInt; assembler; nostackframe;
Description: Get the current program counter (PC)
Note None documented 


function AARCH64GetIRQ:Boolean; assembler; nostackframe;
Description: Get Interrupts (IRQ) state
Return True is enabled, False if disabled (Returned in R0). 


procedure AARCH64EnableIRQ; assembler; nostackframe;
Description: Enable Interrupts (IRQ) unconditionally
Note None documented 


procedure AARCH64DisableIRQ; assembler; nostackframe;
Description: Disable Interrupts (IRQ) unconditionally
Note None documented 


function AARCH64SaveIRQ:TIRQMask; assembler; nostackframe;
Description: Disable Interrupts (IRQ) and return the previous state
Return IRQ state when called (Returned in R0) 


function AARCH64RestoreIRQ(IRQMask:TIRQMask):TIRQMask; assembler; nostackframe;
Description: Restore Interrupts (IRQ) to a previous state
IRQMask IRQ state to restore (Passed in R0)
Return IRQ state when called (Returned in R0) 


function AARCH64GetFIQ:Boolean; assembler; nostackframe;
Description: Get Fast Interrupts (FIQ) state
Return True is enabled, False if disabled (Returned in R0). 


procedure AARCH64EnableFIQ; assembler; nostackframe;
Description: Enable Fast Interrupts (FIQ) unconditionally
Note None documented 


procedure AARCH64DisableFIQ; assembler; nostackframe;
Description: Disable Fast Interrupts (FIQ) unconditionally
Note None documented 


function AARCH64SaveFIQ:TFIQMask; assembler; nostackframe;
Description: Disable Fast Interrupts (FIQ) and return the previous state
Return FIQ state when called (Returned in R0) 


function AARCH64RestoreFIQ(FIQMask:TFIQMask):TFIQMask; assembler; nostackframe;
Description: Restore Fast Interrupts (FIQ) to a previous state
FIQMask FIQ state to restore (Passed in R0)
Return FIQ state when called (Returned in R0) 


procedure AARCH64EnableIRQFIQ; assembler; nostackframe;
Description: Enable Interrupts and Fast Interrupts (IRQ/FIQ) unconditionally
Note None documented 


procedure AARCH64DisableIRQFIQ; assembler; nostackframe;
Description: Disable Interrupts and Fast Interrupts (IRQ/FIQ) unconditionally
Note None documented 


function AARCH64SaveIRQFIQ:TIRQFIQMask; assembler; nostackframe;
Description: Disable Interrupts and Fast Interrupts (IRQ/FIQ) and return the previous state
Return IRQ/FIQ state when called (Returned in R0) 


function AARCH64RestoreIRQFIQ(IRQFIQMask:TIRQFIQMask):TIRQFIQMask; assembler; nostackframe;
Description: Restore Interrupts and Fast Interrupts (IRQ/FIQ) to a previous state
IRQFIQMask IRQ/FIQ state to restore (Passed in R0)
Return IRQ/FIQ state when called (Returned in R0) 


function AARCH64GetAbort:Boolean; assembler; nostackframe;
Description: Get Abort state
Return True is enabled, False if disabled (Returned in R0). 


procedure AARCH64EnableAbort; assembler; nostackframe;
Description: Enable Aborts unconditionally
Note None documented 


procedure AARCH64DisableAbort; assembler; nostackframe;
Description: Disable Aborts unconditionally
Note None documented 


function AARCH64SaveAbort:TAbortMask; assembler; nostackframe;
Description: Disable Aborts and return the previous state
Return Abort state when called (Returned in R0) 


function AARCH64RestoreAbort(AbortMask:TAbortMask):TAbortMask; assembler; nostackframe;
Description: Restore Aborts to a previous state
AbortMask Abort state to restore (Passed in R0)
Return Abort state when called (Returned in R0)


AARCH64 helper functions 

procedure AARCH64Wait; inline;
Description: To be documented
Note None documented 


procedure AARCH64LongWait; inline;
Description: To be documented
Note None documented 


procedure AARCH64ShortWait; inline;
Description: To be documented
Note None documented 


procedure AARCH64SlowBlink; inline;
Description: To be documented
Note None documented 


procedure AARCH64FastBlink; inline;
Description: To be documented
Note None documented 


function AARCH64ModeToString(AARCH64Mode:LongWord):String;
Description: To be documented
Note None documented


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