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[pmp] Use top-level straps for PMP reset values

Browse source 
By using top-level straps for the PMP reset configuration its
easier to implement different reset configurations if there are
multiple Ibex cores in the system.

Signed-off-by: Robert Schilling <rschilling@rivosinc.com>
This commit is contained in:
Robert Schilling 2024-03-01 17:42:07 +01:00 • committed by Greg Chadwick
parent 4ed20f4ac3
commit f92d599e00
8 changed files with 178 additions and 165 deletions
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4
doc/03_reference/pmp.rst
View file

@ -50,5 +50,5 @@ Custom Reset Values
By default all PMP CSRs (include ``mseccfg``) are reset to 0.
Some applications may want other reset values.
Default reset values are defined in :file:`ibex_pmp_reset_default.svh`.
An implementation can either modify this file or define ``IBEX_CUSTOM_PMP_RESET_VALUES`` and place a copy of :file:`ibex_pmp_result_default.svh` in a new file, :file:`ibex_pmp_reset.svh`, changing the values as required and adding the new file to the include path of whatever build flow is being used.
Default reset values are defined in :file:`ibex_pkg.sv`.
An implementation can either modify this file or pass custom reset values as a module parameter.

1
ibex_core.core
View file

@ -36,7 +36,6 @@ filesets:
- rtl/ibex_wb_stage.sv
- rtl/ibex_dummy_instr.sv
- rtl/ibex_core.sv
- rtl/ibex_pmp_reset_default.svh: {is_include_file: true}
file_type: systemVerilogSource
files_lint_verilator:

6
rtl/ibex_core.sv
View file

@ -17,6 +17,9 @@ module ibex_core import ibex_pkg::*; #(
parameter bit PMPEnable = 1'b0,
parameter int unsigned PMPGranularity = 0,
parameter int unsigned PMPNumRegions = 4,
parameter ibex_pkg::pmp_cfg_t PMPRstCfg[16] = ibex_pkg::PmpCfgRst,
parameter logic [33:0] PMPRstAddr[16] = ibex_pkg::PmpAddrRst,
parameter ibex_pkg::pmp_mseccfg_t PMPRstMsecCfg = ibex_pkg::PmpMseccfgRst,
parameter int unsigned MHPMCounterNum = 0,
parameter int unsigned MHPMCounterWidth = 40,
parameter bit RV32E = 1'b0,
@ -1049,6 +1052,9 @@ module ibex_core import ibex_pkg::*; #(
.PMPEnable (PMPEnable),
.PMPGranularity (PMPGranularity),
.PMPNumRegions (PMPNumRegions),
.PMPRstCfg (PMPRstCfg),
.PMPRstAddr (PMPRstAddr),
.PMPRstMsecCfg (PMPRstMsecCfg),
.RV32E (RV32E),
.RV32M (RV32M),
.RV32B (RV32B)

18
rtl/ibex_cs_registers.sv
View file

@ -21,6 +21,9 @@ module ibex_cs_registers #(
parameter bit PMPEnable = 0,
parameter int unsigned PMPGranularity = 0,
parameter int unsigned PMPNumRegions = 4,
parameter ibex_pkg::pmp_cfg_t PMPRstCfg[16] = ibex_pkg::PmpCfgRst,
parameter logic [33:0] PMPRstAddr[16] = ibex_pkg::PmpAddrRst,
parameter ibex_pkg::pmp_mseccfg_t PMPRstMsecCfg = ibex_pkg::PmpMseccfgRst,
parameter bit RV32E = 0,
parameter ibex_pkg::rv32m_e RV32M = ibex_pkg::RV32MFast,
parameter ibex_pkg::rv32b_e RV32B = ibex_pkg::RV32BNone
@ -1073,13 +1076,6 @@ module ibex_cs_registers #(
// -----------------
if (PMPEnable) begin : g_pmp_registers
// PMP reset values
`ifdef IBEX_CUSTOM_PMP_RESET_VALUES
`include "ibex_pmp_reset.svh"
`else
`include "ibex_pmp_reset_default.svh"
`endif
pmp_mseccfg_t pmp_mseccfg_q, pmp_mseccfg_d;
logic pmp_mseccfg_we;
logic pmp_mseccfg_err;
@ -1168,7 +1164,7 @@ module ibex_cs_registers #(
ibex_csr #(
.Width ($bits(pmp_cfg_t)),
.ShadowCopy(ShadowCSR),
.ResetValue(pmp_cfg_rst[i])
.ResetValue(PMPRstCfg[i])
) u_pmp_cfg_csr (
.clk_i (clk_i),
.rst_ni (rst_ni),
@ -1203,7 +1199,7 @@ module ibex_cs_registers #(
ibex_csr #(
.Width (PMPAddrWidth),
.ShadowCopy(ShadowCSR),
.ResetValue(pmp_addr_rst[i][33-:PMPAddrWidth])
.ResetValue(PMPRstAddr[i][33-:PMPAddrWidth])
) u_pmp_addr_csr (
.clk_i (clk_i),
.rst_ni (rst_ni),
@ -1213,7 +1209,7 @@ module ibex_cs_registers #(
.rd_error_o(pmp_addr_err[i])
);
`ASSERT_INIT(PMPAddrRstLowBitsZero_A, pmp_addr_rst[i][33-PMPAddrWidth:0] == '0)
`ASSERT_INIT(PMPAddrRstLowBitsZero_A, PMPRstAddr[i][33-PMPAddrWidth:0] == '0)
assign csr_pmp_cfg_o[i] = pmp_cfg[i];
assign csr_pmp_addr_o[i] = {pmp_addr_rdata[i], 2'b00};
@ -1236,7 +1232,7 @@ module ibex_cs_registers #(
ibex_csr #(
.Width ($bits(pmp_mseccfg_t)),
.ShadowCopy(ShadowCSR),
.ResetValue(pmp_mseccfg_rst)
.ResetValue(PMPRstMsecCfg)
) u_pmp_mseccfg (
.clk_i (clk_i),
.rst_ni (rst_ni),

6
rtl/ibex_lockstep.sv
View file

@ -13,6 +13,9 @@ module ibex_lockstep import ibex_pkg::*; #(
parameter bit PMPEnable = 1'b0,
parameter int unsigned PMPGranularity = 0,
parameter int unsigned PMPNumRegions = 4,
parameter ibex_pkg::pmp_cfg_t PMPRstCfg[16] = ibex_pkg::PmpCfgRst,
parameter logic [33:0] PMPRstAddr[16] = ibex_pkg::PmpAddrRst,
parameter ibex_pkg::pmp_mseccfg_t PMPRstMsecCfg = ibex_pkg::PmpMseccfgRst,
parameter int unsigned MHPMCounterNum = 0,
parameter int unsigned MHPMCounterWidth = 40,
parameter bit RV32E = 1'b0,
@ -347,6 +350,9 @@ module ibex_lockstep import ibex_pkg::*; #(
.PMPEnable ( PMPEnable ),
.PMPGranularity ( PMPGranularity ),
.PMPNumRegions ( PMPNumRegions ),
.PMPRstCfg ( PMPRstCfg ),
.PMPRstAddr ( PMPRstAddr ),
.PMPRstMsecCfg ( PMPRstMsecCfg ),
.MHPMCounterNum ( MHPMCounterNum ),
.MHPMCounterWidth ( MHPMCounterWidth ),
.RV32E ( RV32E ),

50
rtl/ibex_pkg.sv
View file

@ -664,4 +664,54 @@ package ibex_pkg;
// and core_busy signals within `ibex_core` may need adjusting.
parameter ibex_mubi_t IbexMuBiOn = 4'b0101;
parameter ibex_mubi_t IbexMuBiOff = 4'b1010;
// Default reset values for PMP CSRs. Where the number of regions
// (PMPNumRegions) is less than 16 the reset values for the higher numbered
// regions are ignored.
//
// See the Ibex Reference Guide (Custom Reset Values under Physical Memory
// Protection) for more information.
parameter pmp_cfg_t PmpCfgRst[16] = '{
'{lock: 1'b0, mode: PMP_MODE_OFF, exec: 1'b0, write: 1'b0, read: 1'b0}, // region 0
'{lock: 1'b0, mode: PMP_MODE_OFF, exec: 1'b0, write: 1'b0, read: 1'b0}, // region 1
'{lock: 1'b0, mode: PMP_MODE_OFF, exec: 1'b0, write: 1'b0, read: 1'b0}, // region 2
'{lock: 1'b0, mode: PMP_MODE_OFF, exec: 1'b0, write: 1'b0, read: 1'b0}, // region 3
'{lock: 1'b0, mode: PMP_MODE_OFF, exec: 1'b0, write: 1'b0, read: 1'b0}, // region 4
'{lock: 1'b0, mode: PMP_MODE_OFF, exec: 1'b0, write: 1'b0, read: 1'b0}, // region 5
'{lock: 1'b0, mode: PMP_MODE_OFF, exec: 1'b0, write: 1'b0, read: 1'b0}, // region 6
'{lock: 1'b0, mode: PMP_MODE_OFF, exec: 1'b0, write: 1'b0, read: 1'b0}, // region 7
'{lock: 1'b0, mode: PMP_MODE_OFF, exec: 1'b0, write: 1'b0, read: 1'b0}, // region 8
'{lock: 1'b0, mode: PMP_MODE_OFF, exec: 1'b0, write: 1'b0, read: 1'b0}, // region 9
'{lock: 1'b0, mode: PMP_MODE_OFF, exec: 1'b0, write: 1'b0, read: 1'b0}, // region 10
'{lock: 1'b0, mode: PMP_MODE_OFF, exec: 1'b0, write: 1'b0, read: 1'b0}, // region 11
'{lock: 1'b0, mode: PMP_MODE_OFF, exec: 1'b0, write: 1'b0, read: 1'b0}, // region 12
'{lock: 1'b0, mode: PMP_MODE_OFF, exec: 1'b0, write: 1'b0, read: 1'b0}, // region 13
'{lock: 1'b0, mode: PMP_MODE_OFF, exec: 1'b0, write: 1'b0, read: 1'b0}, // region 14
'{lock: 1'b0, mode: PMP_MODE_OFF, exec: 1'b0, write: 1'b0, read: 1'b0} // region 15
};
// Addresses are given in byte granularity for readibility. A minimum of two
// bits will be stripped off the bottom (PMPGranularity == 0) with more stripped
// off at coarser granularities.
parameter logic [33:0] PmpAddrRst[16] = '{
34'h0, // region 0
34'h0, // region 1
34'h0, // region 2
34'h0, // region 3
34'h0, // region 4
34'h0, // region 5
34'h0, // region 6
34'h0, // region 7
34'h0, // region 8
34'h0, // region 9
34'h0, // region 10
34'h0, // region 11
34'h0, // region 12
34'h0, // region 13
34'h0, // region 14
34'h0 // region 15
};
parameter pmp_mseccfg_t PmpMseccfgRst = '{rlb : 1'b0, mmwp: 1'b0, mml: 1'b0};
endpackage

53
rtl/ibex_pmp_reset_default.svh
View file

@ -1,53 +0,0 @@
// Copyright lowRISC contributors.
// Licensed under the Apache License, Version 2.0, see LICENSE for details.
// SPDX-License-Identifier: Apache-2.0
// Default reset values for PMP CSRs. Where the number of regions
// (PMPNumRegions) is less than 16 the reset values for the higher numbered
// regions are ignored.
//
// See the Ibex Reference Guide (Custom Reset Values under Physical Memory
// Protection) for more information.
localparam pmp_cfg_t pmp_cfg_rst[16] = '{
'{lock: 1'b0, mode: PMP_MODE_OFF, exec: 1'b0, write: 1'b0, read: 1'b0}, // region 0
'{lock: 1'b0, mode: PMP_MODE_OFF, exec: 1'b0, write: 1'b0, read: 1'b0}, // region 1
'{lock: 1'b0, mode: PMP_MODE_OFF, exec: 1'b0, write: 1'b0, read: 1'b0}, // region 2
'{lock: 1'b0, mode: PMP_MODE_OFF, exec: 1'b0, write: 1'b0, read: 1'b0}, // region 3
'{lock: 1'b0, mode: PMP_MODE_OFF, exec: 1'b0, write: 1'b0, read: 1'b0}, // region 4
'{lock: 1'b0, mode: PMP_MODE_OFF, exec: 1'b0, write: 1'b0, read: 1'b0}, // region 5
'{lock: 1'b0, mode: PMP_MODE_OFF, exec: 1'b0, write: 1'b0, read: 1'b0}, // region 6
'{lock: 1'b0, mode: PMP_MODE_OFF, exec: 1'b0, write: 1'b0, read: 1'b0}, // region 7
'{lock: 1'b0, mode: PMP_MODE_OFF, exec: 1'b0, write: 1'b0, read: 1'b0}, // region 8
'{lock: 1'b0, mode: PMP_MODE_OFF, exec: 1'b0, write: 1'b0, read: 1'b0}, // region 9
'{lock: 1'b0, mode: PMP_MODE_OFF, exec: 1'b0, write: 1'b0, read: 1'b0}, // region 10
'{lock: 1'b0, mode: PMP_MODE_OFF, exec: 1'b0, write: 1'b0, read: 1'b0}, // region 11
'{lock: 1'b0, mode: PMP_MODE_OFF, exec: 1'b0, write: 1'b0, read: 1'b0}, // region 12
'{lock: 1'b0, mode: PMP_MODE_OFF, exec: 1'b0, write: 1'b0, read: 1'b0}, // region 13
'{lock: 1'b0, mode: PMP_MODE_OFF, exec: 1'b0, write: 1'b0, read: 1'b0}, // region 14
'{lock: 1'b0, mode: PMP_MODE_OFF, exec: 1'b0, write: 1'b0, read: 1'b0} // region 15
};
// Addresses are given in byte granularity for readibility. A minimum of two
// bits will be stripped off the bottom (PMPGranularity == 0) with more stripped
// off at coarser granularities.
localparam [33:0] pmp_addr_rst[16] = '{
34'h0, // region 0
34'h0, // region 1
34'h0, // region 2
34'h0, // region 3
34'h0, // region 4
34'h0, // region 5
34'h0, // region 6
34'h0, // region 7
34'h0, // region 8
34'h0, // region 9
34'h0, // region 10
34'h0, // region 11
34'h0, // region 12
34'h0, // region 13
34'h0, // region 14
34'h0 // region 15
};
localparam pmp_mseccfg_t pmp_mseccfg_rst = '{rlb : 1'b0, mmwp: 1'b0, mml: 1'b0};

9
rtl/ibex_top.sv
View file

@ -18,6 +18,9 @@ module ibex_top import ibex_pkg::*; #(
parameter int unsigned PMPNumRegions = 4,
parameter int unsigned MHPMCounterNum = 0,
parameter int unsigned MHPMCounterWidth = 40,
parameter ibex_pkg::pmp_cfg_t PMPRstCfg[16] = ibex_pkg::PmpCfgRst,
parameter logic [33:0] PMPRstAddr[16] = ibex_pkg::PmpAddrRst,
parameter ibex_pkg::pmp_mseccfg_t PMPRstMsecCfg = ibex_pkg::PmpMseccfgRst,
parameter bit RV32E = 1'b0,
parameter rv32m_e RV32M = RV32MFast,
parameter rv32b_e RV32B = RV32BNone,
@ -283,6 +286,9 @@ module ibex_top import ibex_pkg::*; #(
.PMPEnable (PMPEnable),
.PMPGranularity (PMPGranularity),
.PMPNumRegions (PMPNumRegions),
.PMPRstCfg (PMPRstCfg),
.PMPRstAddr (PMPRstAddr),
.PMPRstMsecCfg (PMPRstMsecCfg),
.MHPMCounterNum (MHPMCounterNum),
.MHPMCounterWidth (MHPMCounterWidth),
.RV32E (RV32E),
@ -984,6 +990,9 @@ module ibex_top import ibex_pkg::*; #(
.PMPEnable (PMPEnable),
.PMPGranularity (PMPGranularity),
.PMPNumRegions (PMPNumRegions),
.PMPRstCfg (PMPRstCfg),
.PMPRstAddr (PMPRstAddr),
.PMPRstMsecCfg (PMPRstMsecCfg),
.MHPMCounterNum (MHPMCounterNum),
.MHPMCounterWidth (MHPMCounterWidth),
.RV32E (RV32E),