Ry 82edb1d8da Implement paging, bump version to 0.3.0

This works in a similar way to x86's paging, by using page directories
which point to page tables, which point to physical addresses.

2022-08-15 17:40:04 -07:00

2.6 KiB

Raw Blame History

Encoding

size instr  . cond dest src <src>          <dest>
xx   xxxxxx 0 xxx  xx   xx  <8,16,32 bits> <8,16,32 bits>

Size table

If the instruction doesn’t allow variable sizes or a size was not specified, set the size bits to Word (0b10) | | | | :–: | ————– | | 0b00 | byte (8 bits) | | 0b01 | half (16 bits) | | 0b10 | word (32 bits) |

Instruction table

0x	-0	-1	-2	-3	-4	-5	-6	-7	-8	-9	-A	-B	-C	-D
0-	NOP	ADD[.8,16,32]	MUL[.8,16,32]	AND[.8,16,32]	SLA[.8,16,32]	SRA[.8,16,32]	BSE[.8,16,32]	CMP[.8,16,32]	JMP	RJMP	PUSH[.8,16,32]	IN	ISE	MSE
1-	HALT	INC[.8,16,32]		OR[.8,16,32]		SRL[.8,16,32]	BCL[.8,16,32]	MOV[.8,16,32]	CALL	RCALL	POP[.8,16,32]	OUT	ICL	MCL
2-	BRK	SUB[.8,16,32]	DIV[.8,16,32]	XOR[.8,16,32]	ROL[.8,16,32]	ROR[.8,16,32]	BTS[.8,16,32]	MOVZ[.8,16,32]	LOOP	RLOOP	RET		INT	TLB
3-		DEC[.8,16,32]	REM[.8,16,32]	NOT[.8,16,32]						RTA	RETI

Condition table

0b000	—	always
0b001	IFZ	zero
0b010	IFNZ	not zero
0b011	IFC	carry
0b011	IFLT	less than (equivalent to IFC)
0b100	IFNC	not carry
0b100	IFGTEQ	greater than or equal to (equivalent to IFNC)
0b101	IFGT	greater than
0b110	IFLTEQ	less than or equal to

Destination table

0b00	register
0b01	register (pointer)
0b10	(invalid)
0b11	immediate (pointer)

Source table

0b00	register
0b01	register (pointer)
0b10	immediate
0b11	immediate (pointer)

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