| Line 56... |
Line 56... |
// 27Feb2013 - fixed MUL/IMUL 8bit flags bug
|
// 27Feb2013 - fixed MUL/IMUL 8bit flags bug
|
// 03Apr2013 - fix RET n alignment bug
|
// 03Apr2013 - fix RET n alignment bug
|
// 04Apr2013 - fix TRAP interrupt acknowledge
|
// 04Apr2013 - fix TRAP interrupt acknowledge
|
// 12Apr2013 - fix IDIV when Q=0
|
// 12Apr2013 - fix IDIV when Q=0
|
// 16May2013 - fix PUSHA SP pushed stack value, which should be the one before PUSHA
|
// 16May2013 - fix PUSHA SP pushed stack value, which should be the one before PUSHA
|
|
// 25May2013 - generate invalid opcode exception for MOV FS and GS
|
///////////////////////////////////////////////////////////////////////////////////
|
///////////////////////////////////////////////////////////////////////////////////
|
`timescale 1ns / 1ps
|
`timescale 1ns / 1ps
|
|
|
module Next186_CPU(
|
module Next186_CPU(
|
output [19:0] ADDR,
|
output [19:0] ADDR,
|
| Line 385... |
Line 386... |
if(FETCH[0][2]) WORD = 1'b1;
|
if(FETCH[0][2]) WORD = 1'b1;
|
if(FETCH[0][2:1] == 2'b10) BBSEL = 2'b11; // RB = SR
|
if(FETCH[0][2:1] == 2'b10) BBSEL = 2'b11; // RB = SR
|
ALUOP = 31; // PASS B
|
ALUOP = 31; // PASS B
|
DISEL = {1'b0, &MOD};
|
DISEL = {1'b0, &MOD};
|
ASEL = 1'b1;
|
ASEL = 1'b1;
|
MREQ = ~&MOD;
|
IRQ = FETCH[0][2] & FETCH[1][5]; // 25May2013 - generate invalid opcode exception for MOV FS and GS
|
|
MREQ = ~&MOD & ~IRQ;
|
WR = MREQ & !FETCH[0][1];
|
WR = MREQ & !FETCH[0][1];
|
WE = WR ? 5'b00000 : &FETCH[0][2:1] ? {2'b00, FETCH[1][4:3] != 2'b01, 2'b00} : {3'b000, WBIT}; // RSSEL, RASEL_HI/RASEL_LO
|
WE = WR | IRQ ? 5'b00000 : &FETCH[0][2:1] ? {2'b00, FETCH[1][4:3] != 2'b01, 2'b00} : {3'b000, WBIT}; // RSSEL, RASEL_HI/RASEL_LO
|
ISIZE = ISIZES;
|
ISIZE = IRQ ? 0 : ISIZES;
|
end
|
end
|
// -------------------------------- mov IMM to R/M --------------------------------
|
// -------------------------------- mov IMM to R/M --------------------------------
|
1: begin
|
1: begin
|
RASEL = RM; // destination
|
RASEL = RM; // destination
|
BBSEL = 2'b10;
|
BBSEL = 2'b10;
|
