mirror of
https://github.com/openhwgroup/cvw
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Merge branch 'tlb_toy' into main
This commit is contained in:
Thomas Fleming
commit
ab6ae6d3f1
233
wally-pipelined/src/mmu/tlb.sv
Normal file
233
wally-pipelined/src/mmu/tlb.sv
Normal file
@ -0,0 +1,233 @@
|
||||
///////////////////////////////////////////
|
||||
// tlb_toy.sv
|
||||
//
|
||||
// Written: jtorrey@hmc.edu 16 February 2021
|
||||
// Modified:
|
||||
//
|
||||
// Purpose: Example translation lookaside buffer
|
||||
// Cache of virtural-to-physical address translations
|
||||
//
|
||||
// A component of the Wally configurable RISC-V project.
|
||||
//
|
||||
// Copyright (C) 2021 Harvey Mudd College & Oklahoma State University
|
||||
//
|
||||
// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation
|
||||
// files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy,
|
||||
// modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software
|
||||
// is furnished to do so, subject to the following conditions:
|
||||
//
|
||||
// The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
|
||||
//
|
||||
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
|
||||
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
|
||||
// BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT
|
||||
// OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
||||
///////////////////////////////////////////
|
||||
|
||||
`include "wally-config.vh"
|
||||
|
||||
/**
|
||||
* sv32 specs
|
||||
* ----------
|
||||
* Virtual address [31:0] (32 bits)
|
||||
* [________________________________]
|
||||
* |--VPN1--||--VPN0--||----OFF---|
|
||||
* 10 10 12
|
||||
*
|
||||
* Physical address [33:0] (34 bits)
|
||||
* [__________________________________]
|
||||
* |---PPN1---||--PPN0--||----OFF---|
|
||||
* 12 10 12
|
||||
*
|
||||
* Page Table Entry [31:0] (32 bits)
|
||||
* [________________________________]
|
||||
* |---PPN1---||--PPN0--|||DAGUXWRV
|
||||
* 12 10 ^^
|
||||
* RSW(2) -- for OS
|
||||
*/
|
||||
|
||||
/* *** TODO:
|
||||
* - add LRU algorithm (select the write index based on which entry was used
|
||||
* least recently)
|
||||
*/
|
||||
|
||||
// The TLB will have 2**ENTRY_BITS total entries
|
||||
module tlb_toy #(parameter ENTRY_BITS = 3) (
|
||||
input clk, reset,
|
||||
|
||||
// Current value of satp CSR (from privileged unit)
|
||||
input [`XLEN-1:0] SATP, // *** How do we get this?
|
||||
|
||||
// Virtual address input
|
||||
input [`XLEN-1:0] VirtualAddress,
|
||||
|
||||
// Controls for writing a new entry to the TLB
|
||||
input [`XLEN-1:0] PageTableEntryWrite,
|
||||
input TLBWrite,
|
||||
|
||||
// Invalidate all TLB entries
|
||||
input TLBFlush,
|
||||
|
||||
// Physical address outputs
|
||||
output [`XLEN-1:0] PhysicalAddress,
|
||||
output TLBMiss,
|
||||
output TLBHit
|
||||
);
|
||||
|
||||
generate
|
||||
if (`XLEN == 32) begin: ARCH
|
||||
localparam VPN_BITS = 20;
|
||||
localparam PPN_BITS = 22;
|
||||
localparam PA_BITS = 34;
|
||||
|
||||
logic SvMode;
|
||||
assign SvMode = SATP[31]; // *** change to an enum somehow?
|
||||
end else begin: ARCH
|
||||
localparam VPN_BITS = 27;
|
||||
localparam PPN_BITS = 44;
|
||||
localparam PA_BITS = 56;
|
||||
|
||||
logic SvMode; // currently just a boolean whether translation enabled
|
||||
assign SvMode = SATP[63]; // *** change to an enum somehow?
|
||||
end
|
||||
endgenerate
|
||||
|
||||
// Index (currently random) to write the next TLB entry
|
||||
logic [ENTRY_BITS-1:0] WriteIndex;
|
||||
|
||||
// Sections of the virtual and physical addresses
|
||||
logic [ARCH.VPN_BITS-1:0] VirtualPageNumber;
|
||||
logic [ARCH.PPN_BITS-1:0] PhysicalPageNumber;
|
||||
logic [11:0] PageOffset;
|
||||
logic [ARCH.PA_BITS-1:0] PhysicalAddressFull;
|
||||
|
||||
// Pattern and pattern location in the CAM
|
||||
logic [ENTRY_BITS-1:0] VPNIndex;
|
||||
|
||||
// RAM access location
|
||||
logic [ENTRY_BITS-1:0] EntryIndex;
|
||||
|
||||
// Page table entry matching the virtual address
|
||||
logic [`XLEN-1:0] PageTableEntry;
|
||||
|
||||
assign VirtualPageNumber = VirtualAddress[ARCH.VPN_BITS+11:12];
|
||||
assign PageOffset = VirtualAddress[11:0];
|
||||
|
||||
// Choose a read or write location to the entry list
|
||||
mux2 #(3) indexmux(VPNIndex, WriteIndex, TLBWrite, EntryIndex);
|
||||
|
||||
// Currently use random replacement algorithm
|
||||
tlb_rand rdm(.*);
|
||||
|
||||
tlb_ram #(ENTRY_BITS) ram(.*);
|
||||
tlb_cam #(ENTRY_BITS, ARCH.VPN_BITS) cam(.*);
|
||||
|
||||
always_comb begin
|
||||
assign PhysicalPageNumber = PageTableEntry[ARCH.PPN_BITS+9:10];
|
||||
|
||||
if (TLBHit) begin
|
||||
assign PhysicalAddressFull = {PhysicalPageNumber, PageOffset};
|
||||
end else begin
|
||||
assign PhysicalAddressFull = 8'b0; // *** Actual behavior; disabled until walker functioning
|
||||
//assign PhysicalAddressFull = {2'b0, VirtualPageNumber, PageOffset} // *** pass through should be removed as soon as walker ready
|
||||
end
|
||||
end
|
||||
|
||||
generate
|
||||
if (`XLEN == 32) begin
|
||||
mux2 #(`XLEN) addressmux(VirtualAddress, PhysicalAddressFull[31:0], ARCH.SvMode, PhysicalAddress);
|
||||
end else begin
|
||||
mux2 #(`XLEN) addressmux(VirtualAddress, {8'b0, PhysicalAddressFull}, ARCH.SvMode, PhysicalAddress);
|
||||
end
|
||||
endgenerate
|
||||
|
||||
assign TLBMiss = ~TLBHit & ~(TLBWrite | TLBFlush) & ARCH.SvMode;
|
||||
endmodule
|
||||
|
||||
module tlb_ram #(parameter ENTRY_BITS = 3) (
|
||||
input clk, reset,
|
||||
input [ENTRY_BITS-1:0] EntryIndex,
|
||||
input [`XLEN-1:0] PageTableEntryWrite,
|
||||
input TLBWrite,
|
||||
|
||||
output [`XLEN-1:0] PageTableEntry
|
||||
);
|
||||
|
||||
localparam NENTRIES = 2**ENTRY_BITS;
|
||||
|
||||
logic [`XLEN-1:0] ram [0:NENTRIES-1];
|
||||
always @(posedge clk) begin
|
||||
if (TLBWrite) ram[EntryIndex] <= PageTableEntryWrite;
|
||||
end
|
||||
|
||||
assign PageTableEntry = ram[EntryIndex];
|
||||
|
||||
initial begin
|
||||
for (int i = 0; i < NENTRIES; i++)
|
||||
ram[i] = `XLEN'b0;
|
||||
end
|
||||
|
||||
endmodule
|
||||
|
||||
module tlb_cam #(parameter ENTRY_BITS = 3,
|
||||
parameter KEY_BITS = 20) (
|
||||
input clk, reset,
|
||||
input [KEY_BITS-1:0] VirtualPageNumber,
|
||||
input [ENTRY_BITS-1:0] WriteIndex,
|
||||
input TLBWrite,
|
||||
input TLBFlush,
|
||||
output [ENTRY_BITS-1:0] VPNIndex,
|
||||
output TLBHit
|
||||
);
|
||||
|
||||
localparam NENTRIES = 2**ENTRY_BITS;
|
||||
|
||||
// Each entry of this memory has KEY_BITS for the key plus one valid bit.
|
||||
logic [KEY_BITS:0] ram [0:NENTRIES-1];
|
||||
|
||||
logic [ENTRY_BITS-1:0] matched_address_comb;
|
||||
logic match_found_comb;
|
||||
|
||||
always @(posedge clk) begin
|
||||
if (TLBWrite) ram[WriteIndex] <= {1'b1,VirtualPageNumber};
|
||||
if (TLBFlush) begin
|
||||
for (int i = 0; i < NENTRIES; i++)
|
||||
ram[i][KEY_BITS] = 1'b0; // Zero out msb (valid bit) of all entries
|
||||
end
|
||||
end
|
||||
|
||||
// *** Check whether this for loop synthesizes correctly
|
||||
always_comb begin
|
||||
match_found_comb = 1'b0;
|
||||
matched_address_comb = '0;
|
||||
for (int i = 0; i < NENTRIES; i++) begin
|
||||
if (ram[i] == {1'b1,VirtualPageNumber} && !match_found_comb) begin
|
||||
matched_address_comb = i;
|
||||
match_found_comb = 1;
|
||||
end else begin
|
||||
matched_address_comb = matched_address_comb;
|
||||
match_found_comb = match_found_comb;
|
||||
end
|
||||
end
|
||||
end
|
||||
|
||||
assign VPNIndex = matched_address_comb;
|
||||
assign TLBHit = match_found_comb & ~(TLBWrite | TLBFlush);
|
||||
|
||||
initial begin
|
||||
for (int i = 0; i < NENTRIES; i++)
|
||||
ram[i] <= '0;
|
||||
end
|
||||
|
||||
endmodule
|
||||
|
||||
module tlb_rand #(parameter ENTRY_BITS = 3) (
|
||||
input clk, reset,
|
||||
output [ENTRY_BITS:0] WriteIndex
|
||||
);
|
||||
|
||||
logic [31:0] data;
|
||||
assign data = $urandom;
|
||||
assign WriteIndex = data[ENTRY_BITS:0];
|
||||
|
||||
endmodule
|
||||
58
wally-pipelined/src/tlb_toy/tlb_testbench.sv
Normal file
58
wally-pipelined/src/tlb_toy/tlb_testbench.sv
Normal file
@ -0,0 +1,58 @@
|
||||
`include "wally-config.vh"
|
||||
|
||||
module tlb_testbench();
|
||||
logic clk, reset;
|
||||
|
||||
// DUT inputs
|
||||
logic [`XLEN-1:0] SATP;
|
||||
logic [`XLEN-1:0] VirtualAddress;
|
||||
logic [`XLEN-1:0] PageTableEntryWrite;
|
||||
logic TLBWrite, TLBFlush;
|
||||
|
||||
// DUT outputs
|
||||
logic [`XLEN-1:0] PhysicalAddress;
|
||||
logic TLBMiss, TLBHit;
|
||||
|
||||
// Testbench signals
|
||||
logic [33:0] expected;
|
||||
logic [31:0] vectornum, errors;
|
||||
logic [99:0] testvectors[10000:0];
|
||||
|
||||
assign SATP = {1'b1, 31'b0};
|
||||
|
||||
// instantiate device under test
|
||||
tlb_toy dut(.*);
|
||||
|
||||
// generate clock
|
||||
always begin
|
||||
clk=1; #5; clk=0; #5;
|
||||
end
|
||||
|
||||
// at start of test, load vectors and pulse reset
|
||||
initial begin
|
||||
$readmemb("tlb_toy.tv", testvectors);
|
||||
vectornum = 0; errors = 0; reset = 1; #22; reset = 0;
|
||||
end
|
||||
|
||||
// apply test vectors on rising edge of clk
|
||||
always @(posedge clk) begin
|
||||
#1; {VirtualAddress, PageTableEntryWrite, TLBWrite, TLBFlush, expected} = testvectors[vectornum];
|
||||
end
|
||||
|
||||
// check results on falling edge of clk
|
||||
always @(negedge clk)
|
||||
if (~reset) begin // skip during reset
|
||||
if ({PhysicalAddress, TLBMiss, TLBHit} !== expected) begin // check result
|
||||
$display("Error: VirtualAddress = %b, write = %b, data = %b, flush = %b", VirtualAddress,
|
||||
TLBWrite, PageTableEntryWrite, TLBFlush);
|
||||
$display(" outputs = %b %b %b (%b expected)",
|
||||
PhysicalAddress, TLBMiss, TLBHit, expected);
|
||||
errors = errors + 1;
|
||||
end
|
||||
vectornum = vectornum + 1;
|
||||
if (testvectors[vectornum] === 100'bx) begin
|
||||
$display("%d tests completed with %d errors", vectornum, errors);
|
||||
$stop;
|
||||
end
|
||||
end
|
||||
endmodule
|
||||
233
wally-pipelined/src/tlb_toy/tlb_toy.sv
Normal file
233
wally-pipelined/src/tlb_toy/tlb_toy.sv
Normal file
@ -0,0 +1,233 @@
|
||||
///////////////////////////////////////////
|
||||
// tlb_toy.sv
|
||||
//
|
||||
// Written: jtorrey@hmc.edu 16 February 2021
|
||||
// Modified:
|
||||
//
|
||||
// Purpose: Example translation lookaside buffer
|
||||
// Cache of virtural-to-physical address translations
|
||||
//
|
||||
// A component of the Wally configurable RISC-V project.
|
||||
//
|
||||
// Copyright (C) 2021 Harvey Mudd College & Oklahoma State University
|
||||
//
|
||||
// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation
|
||||
// files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy,
|
||||
// modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software
|
||||
// is furnished to do so, subject to the following conditions:
|
||||
//
|
||||
// The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
|
||||
//
|
||||
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
|
||||
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
|
||||
// BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT
|
||||
// OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
||||
///////////////////////////////////////////
|
||||
|
||||
`include "wally-config.vh"
|
||||
|
||||
/**
|
||||
* sv32 specs
|
||||
* ----------
|
||||
* Virtual address [31:0] (32 bits)
|
||||
* [________________________________]
|
||||
* |--VPN1--||--VPN0--||----OFF---|
|
||||
* 10 10 12
|
||||
*
|
||||
* Physical address [33:0] (34 bits)
|
||||
* [__________________________________]
|
||||
* |---PPN1---||--PPN0--||----OFF---|
|
||||
* 12 10 12
|
||||
*
|
||||
* Page Table Entry [31:0] (32 bits)
|
||||
* [________________________________]
|
||||
* |---PPN1---||--PPN0--|||DAGUXWRV
|
||||
* 12 10 ^^
|
||||
* RSW(2) -- for OS
|
||||
*/
|
||||
|
||||
/* *** TODO:
|
||||
* - add LRU algorithm (select the write index based on which entry was used
|
||||
* least recently)
|
||||
*/
|
||||
|
||||
// The TLB will have 2**ENTRY_BITS total entries
|
||||
module tlb_toy #(parameter ENTRY_BITS = 3) (
|
||||
input clk, reset,
|
||||
|
||||
// Current value of satp CSR (from privileged unit)
|
||||
input [`XLEN-1:0] SATP, // *** How do we get this?
|
||||
|
||||
// Virtual address input
|
||||
input [`XLEN-1:0] VirtualAddress,
|
||||
|
||||
// Controls for writing a new entry to the TLB
|
||||
input [`XLEN-1:0] PageTableEntryWrite,
|
||||
input TLBWrite,
|
||||
|
||||
// Invalidate all TLB entries
|
||||
input TLBFlush,
|
||||
|
||||
// Physical address outputs
|
||||
output [`XLEN-1:0] PhysicalAddress,
|
||||
output TLBMiss,
|
||||
output TLBHit
|
||||
);
|
||||
|
||||
generate
|
||||
if (`XLEN == 32) begin: ARCH
|
||||
localparam VPN_BITS = 20;
|
||||
localparam PPN_BITS = 22;
|
||||
localparam PA_BITS = 34;
|
||||
|
||||
logic SvMode;
|
||||
assign SvMode = SATP[31]; // *** change to an enum somehow?
|
||||
end else begin: ARCH
|
||||
localparam VPN_BITS = 27;
|
||||
localparam PPN_BITS = 44;
|
||||
localparam PA_BITS = 56;
|
||||
|
||||
logic SvMode; // currently just a boolean whether translation enabled
|
||||
assign SvMode = SATP[63]; // *** change to an enum somehow?
|
||||
end
|
||||
endgenerate
|
||||
|
||||
// Index (currently random) to write the next TLB entry
|
||||
logic [ENTRY_BITS-1:0] WriteIndex;
|
||||
|
||||
// Sections of the virtual and physical addresses
|
||||
logic [ARCH.VPN_BITS-1:0] VirtualPageNumber;
|
||||
logic [ARCH.PPN_BITS-1:0] PhysicalPageNumber;
|
||||
logic [11:0] PageOffset;
|
||||
logic [ARCH.PA_BITS-1:0] PhysicalAddressFull;
|
||||
|
||||
// Pattern and pattern location in the CAM
|
||||
logic [ENTRY_BITS-1:0] VPNIndex;
|
||||
|
||||
// RAM access location
|
||||
logic [ENTRY_BITS-1:0] EntryIndex;
|
||||
|
||||
// Page table entry matching the virtual address
|
||||
logic [`XLEN-1:0] PageTableEntry;
|
||||
|
||||
assign VirtualPageNumber = VirtualAddress[ARCH.VPN_BITS+11:12];
|
||||
assign PageOffset = VirtualAddress[11:0];
|
||||
|
||||
// Choose a read or write location to the entry list
|
||||
mux2 #(3) indexmux(VPNIndex, WriteIndex, TLBWrite, EntryIndex);
|
||||
|
||||
// Currently use random replacement algorithm
|
||||
tlb_rand rdm(.*);
|
||||
|
||||
tlb_ram #(ENTRY_BITS) ram(.*);
|
||||
tlb_cam #(ENTRY_BITS, ARCH.VPN_BITS) cam(.*);
|
||||
|
||||
always_comb begin
|
||||
assign PhysicalPageNumber = PageTableEntry[ARCH.PPN_BITS+9:10];
|
||||
|
||||
if (TLBHit) begin
|
||||
assign PhysicalAddressFull = {PhysicalPageNumber, PageOffset};
|
||||
end else begin
|
||||
assign PhysicalAddressFull = 8'b0; // *** Actual behavior; disabled until walker functioning
|
||||
//assign PhysicalAddressFull = {2'b0, VirtualPageNumber, PageOffset} // *** pass through should be removed as soon as walker ready
|
||||
end
|
||||
end
|
||||
|
||||
generate
|
||||
if (`XLEN == 32) begin
|
||||
mux2 #(`XLEN) addressmux(VirtualAddress, PhysicalAddressFull[31:0], ARCH.SvMode, PhysicalAddress);
|
||||
end else begin
|
||||
mux2 #(`XLEN) addressmux(VirtualAddress, {8'b0, PhysicalAddressFull}, ARCH.SvMode, PhysicalAddress);
|
||||
end
|
||||
endgenerate
|
||||
|
||||
assign TLBMiss = ~TLBHit & ~(TLBWrite | TLBFlush) & ARCH.SvMode;
|
||||
endmodule
|
||||
|
||||
module tlb_ram #(parameter ENTRY_BITS = 3) (
|
||||
input clk, reset,
|
||||
input [ENTRY_BITS-1:0] EntryIndex,
|
||||
input [`XLEN-1:0] PageTableEntryWrite,
|
||||
input TLBWrite,
|
||||
|
||||
output [`XLEN-1:0] PageTableEntry
|
||||
);
|
||||
|
||||
localparam NENTRIES = 2**ENTRY_BITS;
|
||||
|
||||
logic [`XLEN-1:0] ram [0:NENTRIES-1];
|
||||
always @(posedge clk) begin
|
||||
if (TLBWrite) ram[EntryIndex] <= PageTableEntryWrite;
|
||||
end
|
||||
|
||||
assign PageTableEntry = ram[EntryIndex];
|
||||
|
||||
initial begin
|
||||
for (int i = 0; i < NENTRIES; i++)
|
||||
ram[i] = `XLEN'b0;
|
||||
end
|
||||
|
||||
endmodule
|
||||
|
||||
module tlb_cam #(parameter ENTRY_BITS = 3,
|
||||
parameter KEY_BITS = 20) (
|
||||
input clk, reset,
|
||||
input [KEY_BITS-1:0] VirtualPageNumber,
|
||||
input [ENTRY_BITS-1:0] WriteIndex,
|
||||
input TLBWrite,
|
||||
input TLBFlush,
|
||||
output [ENTRY_BITS-1:0] VPNIndex,
|
||||
output TLBHit
|
||||
);
|
||||
|
||||
localparam NENTRIES = 2**ENTRY_BITS;
|
||||
|
||||
// Each entry of this memory has KEY_BITS for the key plus one valid bit.
|
||||
logic [KEY_BITS:0] ram [0:NENTRIES-1];
|
||||
|
||||
logic [ENTRY_BITS-1:0] matched_address_comb;
|
||||
logic match_found_comb;
|
||||
|
||||
always @(posedge clk) begin
|
||||
if (TLBWrite) ram[WriteIndex] <= {1'b1,VirtualPageNumber};
|
||||
if (TLBFlush) begin
|
||||
for (int i = 0; i < NENTRIES; i++)
|
||||
ram[i][KEY_BITS] = 1'b0; // Zero out msb (valid bit) of all entries
|
||||
end
|
||||
end
|
||||
|
||||
// *** Check whether this for loop synthesizes correctly
|
||||
always_comb begin
|
||||
match_found_comb = 1'b0;
|
||||
matched_address_comb = '0;
|
||||
for (int i = 0; i < NENTRIES; i++) begin
|
||||
if (ram[i] == {1'b1,VirtualPageNumber} && !match_found_comb) begin
|
||||
matched_address_comb = i;
|
||||
match_found_comb = 1;
|
||||
end else begin
|
||||
matched_address_comb = matched_address_comb;
|
||||
match_found_comb = match_found_comb;
|
||||
end
|
||||
end
|
||||
end
|
||||
|
||||
assign VPNIndex = matched_address_comb;
|
||||
assign TLBHit = match_found_comb & ~(TLBWrite | TLBFlush);
|
||||
|
||||
initial begin
|
||||
for (int i = 0; i < NENTRIES; i++)
|
||||
ram[i] <= '0;
|
||||
end
|
||||
|
||||
endmodule
|
||||
|
||||
module tlb_rand #(parameter ENTRY_BITS = 3) (
|
||||
input clk, reset,
|
||||
output [ENTRY_BITS:0] WriteIndex
|
||||
);
|
||||
|
||||
logic [31:0] data;
|
||||
assign data = $urandom;
|
||||
assign WriteIndex = data[ENTRY_BITS:0];
|
||||
|
||||
endmodule
|
||||
11
wally-pipelined/src/tlb_toy/tlb_toy.tv
Normal file
11
wally-pipelined/src/tlb_toy/tlb_toy.tv
Normal file
@ -0,0 +1,11 @@
|
||||
// tlb_toy.tv
|
||||
// PCF _ PageTableEntryF _ ITLBWriteF _ ITLBFlushF ___ PCPF _ ITLBMissF _ ITLBHitF
|
||||
10101010101010101010101010101010_00000000000000000000000000000000_0_0___00000000000000000000000000000000_1_0
|
||||
// Write test: Add translation aaaaa -> 044444 to TLB
|
||||
10101010101010101010101010101010_00010001000100010001001100110010_1_0___00000000000000000000000000000000_0_0
|
||||
10101010101010101010101010101010_00000000000000000000000000000000_0_0___01000100010001000100101010101010_0_1
|
||||
10101010101010101010101010101010_00000000000000000000000000000000_0_0___01000100010001000100101010101010_0_1
|
||||
10101010100010101010101010101010_00000000000000000000000000000000_0_0___00000000000000000000000000000000_1_0
|
||||
// Flush test: should invalidate all entries
|
||||
00000000000000000000000000000000_00000000000000000000000000000000_0_1___00000000000000000000000000000000_0_0
|
||||
10101010101010101010101010101010_00000000000000000000000000000000_0_0___00000000000000000000000000000000_1_0
|
||||
Loading…
Reference in New Issue
Block a user