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Place tlb parameters into constant header file

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Thomas Fleming 2021-03-05 13:35:24 -05:00
parent e48dc38869
commit 85dcbee86b
6 changed files with 181 additions and 28 deletions
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31
wally-pipelined/config/busybear/wally-constants.vh Normal file
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@ -0,0 +1,31 @@
//////////////////////////////////////////
// wally-constants.vh
//
// Written: tfleming@hmc.edu 4 March 2021
// Modified:
//
// Purpose: Specify certain constants defined in the RISC-V 64-bit architecture.
// These macros should not be changed, except in the event of an
// update to the architecture or particularly special circumstances.
//
// 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.
///////////////////////////////////////////
// Virtual Memory Constants (sv39)
`define VPN_BITS 27
`define PPN_BITS 44
`define PA_BITS 56

31
wally-pipelined/config/coremark/wally-constants.vh Normal file
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@ -0,0 +1,31 @@
//////////////////////////////////////////
// wally-constants.vh
//
// Written: tfleming@hmc.edu 4 March 2021
// Modified:
//
// Purpose: Specify certain constants defined in the RISC-V 64-bit architecture.
// These macros should not be changed, except in the event of an
// update to the architecture or particularly special circumstances.
//
// 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.
///////////////////////////////////////////
// Virtual Memory Constants (sv39)
`define VPN_BITS 27
`define PPN_BITS 44
`define PA_BITS 56

31
wally-pipelined/config/rv32ic/wally-constants.vh Normal file
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@ -0,0 +1,31 @@
//////////////////////////////////////////
// wally-constants.vh
//
// Written: tfleming@hmc.edu 4 March 2021
// Modified:
//
// Purpose: Specify certain constants defined in the RISC-V 64-bit architecture.
// These macros should not be changed, except in the event of an
// update to the architecture or particularly special circumstances.
//
// 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.
///////////////////////////////////////////
// Virtual Memory Constants (sv32)
`define VPN_BITS 20
`define PPN_BITS 22
`define PA_BITS 34

31
wally-pipelined/config/rv64ic/wally-constants.vh Normal file
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@ -0,0 +1,31 @@
//////////////////////////////////////////
// wally-constants.vh
//
// Written: tfleming@hmc.edu 4 March 2021
// Modified:
//
// Purpose: Specify certain constants defined in the RISC-V 64-bit architecture.
// These macros should not be changed, except in the event of an
// update to the architecture or particularly special circumstances.
//
// 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.
///////////////////////////////////////////
// Virtual Memory Constants (sv39)
`define VPN_BITS 27
`define PPN_BITS 44
`define PA_BITS 56

31
wally-pipelined/config/rv64icfd/wally-constants.vh Normal file
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@ -0,0 +1,31 @@
//////////////////////////////////////////
// wally-constants.vh
//
// Written: tfleming@hmc.edu 4 March 2021
// Modified:
//
// Purpose: Specify certain constants defined in the RISC-V 64-bit architecture.
// These macros should not be changed, except in the event of an
// update to the architecture or particularly special circumstances.
//
// 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.
///////////////////////////////////////////
// Virtual Memory Constants (sv39)
`define VPN_BITS 27
`define PPN_BITS 44
`define PA_BITS 56

54
wally-pipelined/src/mmu/tlb.sv
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@ -25,6 +25,7 @@
///////////////////////////////////////////
`include "wally-config.vh"
`include "wally-constants.vh"
/**
* sv32 specs
@ -57,7 +58,7 @@ module tlb #(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?
input [`XLEN-1:0] SATP_REGW,
// Virtual address input
input [`XLEN-1:0] VirtualAddress,
@ -75,32 +76,29 @@ module tlb #(parameter ENTRY_BITS = 3) (
output TLBHit
);
logic SvMode;
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?
if (`XLEN == 32) begin
assign SvMode = SATP_REGW[31]; // *** change to an enum somehow?
end else begin
assign SvMode = SATP_REGW[63]; // currently just a boolean whether translation enabled
end
endgenerate
// *** If we want to support multiple virtual memory modes (ie sv39 AND sv48),
// we could have some muxes that control which parameters are current.
// Although then some of the signals are not big enough. But that's a problem
// for much later.
// 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;
logic [`VPN_BITS-1:0] VirtualPageNumber;
logic [`PPN_BITS-1:0] PhysicalPageNumber;
logic [11:0] PageOffset;
logic [`PA_BITS-1:0] PhysicalAddressFull;
// Pattern and pattern location in the CAM
logic [ENTRY_BITS-1:0] VPNIndex;
@ -111,7 +109,7 @@ module tlb #(parameter ENTRY_BITS = 3) (
// Page table entry matching the virtual address
logic [`XLEN-1:0] PageTableEntry;
assign VirtualPageNumber = VirtualAddress[ARCH.VPN_BITS+11:12];
assign VirtualPageNumber = VirtualAddress[`VPN_BITS+11:12];
assign PageOffset = VirtualAddress[11:0];
// Choose a read or write location to the entry list
@ -121,28 +119,28 @@ module tlb #(parameter ENTRY_BITS = 3) (
tlb_rand rdm(.*);
tlb_ram #(ENTRY_BITS) ram(.*);
tlb_cam #(ENTRY_BITS, ARCH.VPN_BITS) cam(.*);
tlb_cam #(ENTRY_BITS, `VPN_BITS) cam(.*);
always_comb begin
assign PhysicalPageNumber = PageTableEntry[ARCH.PPN_BITS+9:10];
assign PhysicalPageNumber = PageTableEntry[`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 = '0; // *** 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);
mux2 #(`XLEN) addressmux(VirtualAddress, PhysicalAddressFull[31:0], SvMode, PhysicalAddress);
end else begin
mux2 #(`XLEN) addressmux(VirtualAddress, {8'b0, PhysicalAddressFull}, ARCH.SvMode, PhysicalAddress);
mux2 #(`XLEN) addressmux(VirtualAddress, {8'b0, PhysicalAddressFull}, SvMode, PhysicalAddress);
end
endgenerate
assign TLBMiss = ~TLBHit & ~(TLBWrite | TLBFlush) & ARCH.SvMode;
assign TLBMiss = ~TLBHit & ~(TLBWrite | TLBFlush) & SvMode;
endmodule
module tlb_ram #(parameter ENTRY_BITS = 3) (
@ -217,13 +215,13 @@ module tlb_cam #(parameter ENTRY_BITS = 3,
initial begin
for (int i = 0; i < NENTRIES; i++)
ram[i] <= '0;
ram[i] = '0;
end
endmodule
module tlb_rand #(parameter ENTRY_BITS = 3) (
input clk, reset,
input clk, reset,
output [ENTRY_BITS-1:0] WriteIndex
);