memory

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 Go to latest Published: May 31, 2021 License: MIT Imports: 14 Imported by: 5

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Index

Constants

View Source 
const (
	UnpackedDecTSC = 0
	UnpackedDecLSC = 1
	UnpackedDecTS  = 2
	UnpackedDecLS  = 3 // <sign><zeroes><int>
	UnpackedDecU   = 4 // <zeroes><int>
	PackedDec      = 5
	TwosCompDec    = 6
	FPDec          = 7
)

Decimal Data Types - values are significant

View Source 
const (
	NspLoc  = 040 // 32. Narrow Stack Pointer
	NfpLoc  = 041
	NslLoc  = 042
	NsfaLoc = 043
)

Some Page Zero special locations for the Narrow Stack

Variables

This section is empty.

Functions

func AddUnsharedPage 

func AddUnsharedPage() int

AddUnsharedPage appends an unshared page to virtual memory

func BmcdchReadReg 

func BmcdchReadReg(reg int) dg.WordT

BmcdchReadReg returns the single word contents of the requested register

func BmcdchReadSlot 

func BmcdchReadSlot(slot int) dg.DwordT

BmcdchReadSlot returns the doubleword contents of the requested SLOT

func BmcdchReset 

func BmcdchReset()

BmcdchReset clears bits 3,4,7,8 & 14 of the IOCDR

func BmcdchWriteReg 

func BmcdchWriteReg(reg int, data dg.WordT)

BmcdchWriteReg populates a given 16-bit register with the supplied data N.B. Addressed by REGISTER not slot

func BmcdchWriteSlot 

func BmcdchWriteSlot(slot int, data dg.DwordT)

BmcdchWriteSlot populates a whole SLOT (pair of registers) with the supplied doubleword N.B. Addressed by SLOT not register

func BoolToInt 

func BoolToInt(b bool) int

BoolToInt converts a bool to 1 or 0

func BoolToOZ 

func BoolToOZ(b bool) byte

BoolToOZ converts a boolean to a O(ne) or Z(ero) byte

func BoolToOnOff 

func BoolToOnOff(b bool) string

BoolToOnOff converts a bool to "On" or "Off"

func BoolToYN 

func BoolToYN(b bool) byte

BoolToYN converts a bool to Y or N

func ClearDwbit 

func ClearDwbit(dword *dg.DwordT, bitNum uint)

ClearDwbit clears a single bit in a DG doubleword

func ClearQwbit 

func ClearQwbit(qword *dg.QwordT, bitNum uint)

ClearQwbit clears a single bit in a DG quadword

func ClearWbit 

func ClearWbit(word *dg.WordT, bitNum uint)

ClearWbit clears a single bit in a DG word

func DGdoubleToFloat64 

func DGdoubleToFloat64(q dg.QwordT) (f float64)

DGdoubleToFloat64 converts a DG Double Precison number to Go float64

func DGsingleToFloat64 

func DGsingleToFloat64(s dg.DwordT) (f float64)

DGsingleToFloat64 converts a DG Single Precison number to Go float64

func DecIntToInt 

func DecIntToInt(decType int, dec string) (i int)

DecIntToInt returns an int value of the DG Decimal integer supplied

func DecodeDecDataType 

func DecodeDecDataType(dti dg.DwordT) (scaleFactor int8, decType int, size int)

DecodeDecDataType extracts the scale, type and length from a Decimal Type Indicator

func DumpToFile 

func DumpToFile(fn string) bool

DumpToFile writes out usefully greppable text representation of memory.

func DwordFromTwoWords 

func DwordFromTwoWords(hw dg.WordT, lw dg.WordT) dg.DwordT

DwordFromTwoWords - catenate two DG Words into a DG DoubleWord

func DwordGetLowerWord 

func DwordGetLowerWord(dwd dg.DwordT) dg.WordT

DwordGetLowerWord gets the DG-lower word (RHS) of a doubleword Called VERY often, hopefully inlined!

func DwordGetUpperWord 

func DwordGetUpperWord(dwd dg.DwordT) dg.WordT

DwordGetUpperWord gets the DG-higher word (LHS) of a doubleword Called VERY often, hopefully inlined!

func FlipWbit 

func FlipWbit(word *dg.WordT, bitNum uint)

FlipWbit - flips a single bit in a Word using DG numbering

func Float64toDGdouble 

func Float64toDGdouble(f float64) (q dg.QwordT)

Float64toDGdouble converts a standard Go float64 into the DG Double Precision format

func Float64toDGsingle 

func Float64toDGsingle(f float64) (s dg.DwordT)

Float64toDGsingle converts a standard Go float64 into the DG Single Precision format

func GetDwbits 

func GetDwbits(value dg.DwordT, leftBit uint, nbits uint) dg.DwordT

GetDwbits - in the DG world, the first (leftmost) bit is numbered zero... extract nbits from value starting at leftBit

func GetFirstSharedPage 

func GetFirstSharedPage() dg.DwordT

GetFirstSharedPage is a getter for the lowest shared page currently mapped

func GetLastSharedPage 

func GetLastSharedPage() dg.DwordT

GetLastSharedPage calculates the last shared page mapped

func GetLastUnsharedPage 

func GetLastUnsharedPage() dg.DwordT

GetLastUnsharedPage is a getter for the highest unshared page currently mapped

func GetNumSharedPages 

func GetNumSharedPages() int

GetNumSharedPages is a getter for the number of shared pages currently mapped

func GetQwbits 

func GetQwbits(value dg.QwordT, leftBit uint, nbits uint) dg.QwordT

GetQwbits - in the DG world, the first (leftmost) bit is numbered zero... extract nbits from value starting at leftBit

func GetSegment 

func GetSegment(addr dg.PhysAddrT) int

GetSegment - return the segment number for the supplied address

func GetWbits 

func GetWbits(value dg.WordT, leftBit uint, nbits uint) dg.WordT

GetWbits - in the DG world, the first (leftmost) bit is numbered zero... extract nbits from value starting at leftBit

func IsPageMapped 

func IsPageMapped(page int) (locked bool)

func LoadFromASCIIFile 

func LoadFromASCIIFile(asciiOctalFilename string) string

LoadFromASCIIFile reads a CSV-formatted ASCII file representing the contents of memory in octal words and loads it directly into memory. It can be used to directly load assembled listings such as diagnostics.

func MapPage 

func MapPage(page int, shared bool)

MapPage maps (allocates) a 1kW page of virtual memory for the process

func MapSlice 

func MapSlice(addr dg.PhysAddrT, wds []dg.WordT, shared bool)

MapSlice maps (copies) the provided slice to virtual memory starting at the given address

func MemInit 

func MemInit(wordSize int, doLog bool)

MemInit should be called at machine start

func NsPop 

func NsPop(seg dg.PhysAddrT, debugging bool) dg.WordT

NsPop - POP a word off the Narrow Stack

func NsPush 

func NsPush(seg dg.PhysAddrT, data dg.WordT, debugging bool)

NsPush - PUSH a word onto the Narrow Stack

func QwordFromTwoDwords 

func QwordFromTwoDwords(hdw dg.DwordT, ldw dg.DwordT) dg.QwordT

QwordFromTwoDwords - catenate two DG DoubleWords into a DG QuadWord

func QwordGetLowerDword 

func QwordGetLowerDword(qwd dg.QwordT) dg.DwordT

QwordGetLowerDword gets the DG-lower (RHS) of a quadword

func QwordGetUpperDword 

func QwordGetUpperDword(qwd dg.QwordT) dg.DwordT

QwordGetUpperDword gets the DG-upper (LHS) of a quadword

func ReadByte 

func ReadByte(wordAddr dg.PhysAddrT, loByte bool) dg.ByteT

ReadByte - read a byte from memory using word address and low-byte flag (true => lower (rightmost) byte)

func ReadByteEclipseBA 

func ReadByteEclipseBA(pcAddr dg.PhysAddrT, byteAddr16 dg.WordT) dg.ByteT

ReadByteEclipseBA - read a byte - special version for Eclipse Byte-Addressing

func ReadBytes 

func ReadBytes(ba32 dg.DwordT, pc dg.PhysAddrT, num int) (res []byte)

ReadBytes - read specified # of bytes from 32-bit BA into slice

func ReadDWord 

func ReadDWord(addr dg.PhysAddrT) dg.DwordT

ReadDWord does what it says on the tin

func ReadDec 

func ReadDec(ba dg.PhysAddrT, size int) (dec string)

ReadDec returns a string of the Decimal value pointed to by the given byte address

func ReadDwordTrap 

func ReadDwordTrap(wordAddr dg.PhysAddrT) (dg.DwordT, bool)

ReadDwordTrap returns the doubleword at the given physical address

func ReadEclipseWordTrap 

func ReadEclipseWordTrap(wordAddr dg.WordT) (dg.WordT, bool)

ReadEclipseWordTrap returns the DG Word at the specified 16-bit physical address

func ReadNBytes 

func ReadNBytes(ba dg.PhysAddrT, n int) []byte

ReadNBytes loads n bytes into a slice which is returned - no ring-forcing is performed

func ReadWord 

func ReadWord(wordAddr dg.PhysAddrT) dg.WordT

ReadWord returns the DG Word at the specified physical address

func ReadWord16 

func ReadWord16(wordAddr dg.WordT) dg.WordT

ReadWord16 returns the DG Word at the specified physical address

func ReadWordBmcChan 

func ReadWordBmcChan(addr *dg.PhysAddrT) dg.WordT

ReadWordBmcChan reads a word from memory over the virtual Burst Multiplex Channel addr is incremented after use

func ReadWordBmcChan16bit 

func ReadWordBmcChan16bit(addr *dg.WordT) dg.WordT

ReadWordBmcChan16bit reads a word from memory over the virtual Burst Multiplex Channel for 16-bit devices

func ReadWordDchChan 

func ReadWordDchChan(addr *dg.PhysAddrT) dg.WordT

ReadWordDchChan - reads a 16-bit word over the virtual DCH channel addr is incremented after use

func ReadWordTrap 

func ReadWordTrap(wordAddr dg.PhysAddrT) (dg.WordT, bool)

ReadWordTrap returns the DG Word at the specified physical address

func SetDwbit 

func SetDwbit(dw *dg.DwordT, bitNum uint)

SetDwbit - sets a bit in a Double-Word

func SetQwbit 

func SetQwbit(qw *dg.QwordT, bitNum uint)

SetQwbit - sets a bit in a Quad-Word

func SetWbit 

func SetWbit(word *dg.WordT, bitNum uint)

SetWbit sets a single bit in a DG word

func SexWordToDword 

func SexWordToDword(wd dg.WordT) dg.DwordT

SexWordToDword - sign-extend a DG word to a DG DoubleWord

func SwapBytes 

func SwapBytes(wd dg.WordT) (res dg.WordT)

SwapBytes - swap over the two bytes in a dg_word

func TestBbit 

func TestBbit(b8 dg.ByteT, b int) bool

TestBbit - does byte b8 have bit b set?

func TestDwbit 

func TestDwbit(dw dg.DwordT, b int) bool

TestDwbit - does dword dw have bit b set?

func TestQwbit 

func TestQwbit(qw dg.QwordT, b int) bool

TestQwbit - does qword qw have bit b set?

func TestWbit 

func TestWbit(w dg.WordT, b int) bool

TestWbit - does word w have bit b set?

func UnmapPage 

func UnmapPage(page int, shared bool)

UnmapPage unmaps (deallocates) a 1kW page of virtual memory from the process

func WordToBinStr 

func WordToBinStr(w dg.WordT) string

WordToBinStr - get a pretty-printable string of a word

func WordsFromBytes 

func WordsFromBytes(ba []byte) (wa []dg.WordT)

WordsFromBytes converts a slice of (Go) bytes into a slice of DG Words

func WriteByte 

func WriteByte(wordAddr dg.PhysAddrT, loByte bool, b dg.ByteT)

func WriteByteBA 

func WriteByteBA(byteAddr dg.DwordT, b dg.ByteT)

WriteByteBA writes a byte to a standard Byte Addressed location

func WriteBytesBA 

func WriteBytesBA(b []byte, byteAddr dg.DwordT)

WriteBytesBA copies a byte array to the specified address

func WriteDWord 

func WriteDWord(wordAddr dg.PhysAddrT, dwd dg.DwordT)

WriteDWord writes a doubleword into memory at the given physical address

func WriteStringBA 

func WriteStringBA(s string, byteAddr dg.DwordT)

WriteStringBA copies a string to the specified address

func WriteWord 

func WriteWord(wordAddr dg.PhysAddrT, datum dg.WordT)

WriteWord - For the 32-bit emulator ALL memory-writing should ultimately go through this function N.B. minor exceptions may be made for NsPush() and NsPop()

func WriteWord16 

func WriteWord16(wordAddr dg.WordT, datum dg.WordT)

WriteWord16 - For the 16-bit emulators ALL memory-writing should ultimately go through this function N.B. minor exceptions may be made for NsPush() and NsPop()

func WriteWordBmcChan 

func WriteWordBmcChan(addr *dg.PhysAddrT, data dg.WordT)

WriteWordBmcChan writes a word over the virtual Burst Multiplex Channel

func WriteWordBmcChan16bit 

func WriteWordBmcChan16bit(addr *dg.WordT, data dg.WordT)

WriteWordBmcChan16bit writes a word over the virtual Burst Multiplex Channel for 16-bit devices

func WriteWordDchChan 

func WriteWordDchChan(unmappedAddr *dg.PhysAddrT, data dg.WordT) (physAddr dg.PhysAddrT)

WriteWordDchChan writes a word to memory over the virtual DCH physAddr is returned for debugging purposes only

Types

This section is empty.

Source Files

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