diff --git a/core/csr_regfile.sv b/core/csr_regfile.sv index af4546cfab..18e7549121 100644 --- a/core/csr_regfile.sv +++ b/core/csr_regfile.sv @@ -162,7 +162,7 @@ module csr_regfile | (riscv::XLEN'(1) << 8) // I - RV32I/64I/128I base ISA | (riscv::XLEN'(1) << 12) // M - Integer Multiply/Divide extension | (riscv::XLEN'(0) << 13) // N - User level interrupts supported - | (riscv::XLEN'(1) << 18) // S - Supervisor mode implemented + | (riscv::XLEN'(CVA6Cfg.RVS) << 18) // S - Supervisor mode implemented | (riscv::XLEN'(1) << 20) // U - User mode implemented | (riscv::XLEN'(CVA6Cfg.RVV) << 21) // V - Vector extension | (riscv::XLEN'(CVA6Cfg.NSX) << 23) // X - Non-standard extensions present @@ -235,22 +235,44 @@ module csr_regfile riscv::CSR_TDATA3: ; // not implemented // supervisor registers riscv::CSR_SSTATUS: begin - csr_rdata = mstatus_extended & ariane_pkg::SMODE_STATUS_READ_MASK[riscv::XLEN-1:0]; + if (CVA6Cfg.RVS) + csr_rdata = mstatus_extended & ariane_pkg::SMODE_STATUS_READ_MASK[riscv::XLEN-1:0]; + else read_access_exception = 1'b1; end - riscv::CSR_SIE: csr_rdata = mie_q & mideleg_q; - riscv::CSR_SIP: csr_rdata = mip_q & mideleg_q; - riscv::CSR_STVEC: csr_rdata = stvec_q; - riscv::CSR_SCOUNTEREN: csr_rdata = scounteren_q; - riscv::CSR_SSCRATCH: csr_rdata = sscratch_q; - riscv::CSR_SEPC: csr_rdata = sepc_q; - riscv::CSR_SCAUSE: csr_rdata = scause_q; - riscv::CSR_STVAL: csr_rdata = stval_q; + riscv::CSR_SIE: + if (CVA6Cfg.RVS) csr_rdata = mie_q & mideleg_q; + else read_access_exception = 1'b1; + riscv::CSR_SIP: + if (CVA6Cfg.RVS) csr_rdata = mip_q & mideleg_q; + else read_access_exception = 1'b1; + riscv::CSR_STVEC: + if (CVA6Cfg.RVS) csr_rdata = stvec_q; + else read_access_exception = 1'b1; + riscv::CSR_SCOUNTEREN: + if (CVA6Cfg.RVS) csr_rdata = scounteren_q; + else read_access_exception = 1'b1; + riscv::CSR_SSCRATCH: + if (CVA6Cfg.RVS) csr_rdata = sscratch_q; + else read_access_exception = 1'b1; + riscv::CSR_SEPC: + if (CVA6Cfg.RVS) csr_rdata = sepc_q; + else read_access_exception = 1'b1; + riscv::CSR_SCAUSE: + if (CVA6Cfg.RVS) csr_rdata = scause_q; + else read_access_exception = 1'b1; + riscv::CSR_STVAL: + if (CVA6Cfg.RVS) csr_rdata = stval_q; + else read_access_exception = 1'b1; riscv::CSR_SATP: begin - // intercept reads to SATP if in S-Mode and TVM is enabled - if (priv_lvl_o == riscv::PRIV_LVL_S && mstatus_q.tvm) begin - read_access_exception = 1'b1; + if (CVA6Cfg.RVS) begin + // intercept reads to SATP if in S-Mode and TVM is enabled + if (priv_lvl_o == riscv::PRIV_LVL_S && mstatus_q.tvm) begin + read_access_exception = 1'b1; + end else begin + csr_rdata = satp_q; + end end else begin - csr_rdata = satp_q; + read_access_exception = 1'b1; end end // machine mode registers @@ -259,8 +281,12 @@ module csr_regfile if (riscv::XLEN == 32) csr_rdata = '0; else read_access_exception = 1'b1; riscv::CSR_MISA: csr_rdata = IsaCode; - riscv::CSR_MEDELEG: csr_rdata = medeleg_q; - riscv::CSR_MIDELEG: csr_rdata = mideleg_q; + riscv::CSR_MEDELEG: + if (CVA6Cfg.RVS) csr_rdata = medeleg_q; + else read_access_exception = 1'b1; + riscv::CSR_MIDELEG: + if (CVA6Cfg.RVS) csr_rdata = mideleg_q; + else read_access_exception = 1'b1; riscv::CSR_MIE: csr_rdata = mie_q; riscv::CSR_MTVEC: csr_rdata = mtvec_q; riscv::CSR_MCOUNTEREN: csr_rdata = mcounteren_q; @@ -654,54 +680,82 @@ module csr_regfile riscv::CSR_TDATA3: ; // not implemented // sstatus is a subset of mstatus - mask it accordingly riscv::CSR_SSTATUS: begin - mask = ariane_pkg::SMODE_STATUS_WRITE_MASK[riscv::XLEN-1:0]; - mstatus_d = (mstatus_q & ~{{64-riscv::XLEN{1'b0}}, mask}) | {{64-riscv::XLEN{1'b0}}, (csr_wdata & mask)}; - // hardwire to zero if floating point extension is not present - if (!CVA6Cfg.FpPresent) begin - mstatus_d.fs = riscv::Off; - end - // hardwire to zero if vector extension is not present - if (!CVA6Cfg.RVV) begin - mstatus_d.vs = riscv::Off; + if (CVA6Cfg.RVS) begin + mask = ariane_pkg::SMODE_STATUS_WRITE_MASK[riscv::XLEN-1:0]; + mstatus_d = (mstatus_q & ~{{64-riscv::XLEN{1'b0}}, mask}) | {{64-riscv::XLEN{1'b0}}, (csr_wdata & mask)}; + // hardwire to zero if floating point extension is not present + if (!CVA6Cfg.FpPresent) begin + mstatus_d.fs = riscv::Off; + end + // hardwire to zero if vector extension is not present + if (!CVA6Cfg.RVV) begin + mstatus_d.vs = riscv::Off; + end + // this instruction has side-effects + flush_o = 1'b1; + end else begin + update_access_exception = 1'b1; end - // this instruction has side-effects - flush_o = 1'b1; end // even machine mode interrupts can be visible and set-able to supervisor // if the corresponding bit in mideleg is set riscv::CSR_SIE: begin - // the mideleg makes sure only delegate-able register (and therefore also only implemented registers) are written - mie_d = (mie_q & ~mideleg_q) | (csr_wdata & mideleg_q); + if (CVA6Cfg.RVS) begin + // the mideleg makes sure only delegate-able register (and therefore also only implemented registers) are written + mie_d = (mie_q & ~mideleg_q) | (csr_wdata & mideleg_q); + end else begin + update_access_exception = 1'b1; + end end riscv::CSR_SIP: begin - // only the supervisor software interrupt is write-able, iff delegated - mask = riscv::MIP_SSIP & mideleg_q; - mip_d = (mip_q & ~mask) | (csr_wdata & mask); + if (CVA6Cfg.RVS) begin + // only the supervisor software interrupt is write-able, iff delegated + mask = riscv::MIP_SSIP & mideleg_q; + mip_d = (mip_q & ~mask) | (csr_wdata & mask); + end else begin + update_access_exception = 1'b1; + end end - riscv::CSR_STVEC: stvec_d = {csr_wdata[riscv::XLEN-1:2], 1'b0, csr_wdata[0]}; - riscv::CSR_SCOUNTEREN: scounteren_d = {{riscv::XLEN - 32{1'b0}}, csr_wdata[31:0]}; - riscv::CSR_SSCRATCH: sscratch_d = csr_wdata; - riscv::CSR_SEPC: sepc_d = {csr_wdata[riscv::XLEN-1:1], 1'b0}; - riscv::CSR_SCAUSE: scause_d = csr_wdata; - riscv::CSR_STVAL: stval_d = csr_wdata; + riscv::CSR_STVEC: + if (CVA6Cfg.RVS) stvec_d = {csr_wdata[riscv::XLEN-1:2], 1'b0, csr_wdata[0]}; + else update_access_exception = 1'b1; + riscv::CSR_SCOUNTEREN: + if (CVA6Cfg.RVS) scounteren_d = {{riscv::XLEN - 32{1'b0}}, csr_wdata[31:0]}; + else update_access_exception = 1'b1; + riscv::CSR_SSCRATCH: + if (CVA6Cfg.RVS) sscratch_d = csr_wdata; + else update_access_exception = 1'b1; + riscv::CSR_SEPC: + if (CVA6Cfg.RVS) sepc_d = {csr_wdata[riscv::XLEN-1:1], 1'b0}; + else update_access_exception = 1'b1; + riscv::CSR_SCAUSE: + if (CVA6Cfg.RVS) scause_d = csr_wdata; + else update_access_exception = 1'b1; + riscv::CSR_STVAL: + if (CVA6Cfg.RVS) stval_d = csr_wdata; + else update_access_exception = 1'b1; // supervisor address translation and protection riscv::CSR_SATP: begin - // intercept SATP writes if in S-Mode and TVM is enabled - if (priv_lvl_o == riscv::PRIV_LVL_S && mstatus_q.tvm) update_access_exception = 1'b1; - else begin - satp = riscv::satp_t'(csr_wdata); - // only make ASID_LEN - 1 bit stick, that way software can figure out how many ASID bits are supported - satp.asid = satp.asid & {{(riscv::ASIDW - AsidWidth) {1'b0}}, {AsidWidth{1'b1}}}; - // only update if we actually support this mode - if (riscv::vm_mode_t'(satp.mode) == riscv::ModeOff || - riscv::vm_mode_t'(satp.mode) == riscv::MODE_SV) - satp_d = satp; + if (CVA6Cfg.RVS) begin + // intercept SATP writes if in S-Mode and TVM is enabled + if (priv_lvl_o == riscv::PRIV_LVL_S && mstatus_q.tvm) update_access_exception = 1'b1; + else begin + satp = riscv::satp_t'(csr_wdata); + // only make ASID_LEN - 1 bit stick, that way software can figure out how many ASID bits are supported + satp.asid = satp.asid & {{(riscv::ASIDW - AsidWidth) {1'b0}}, {AsidWidth{1'b1}}}; + // only update if we actually support this mode + if (riscv::vm_mode_t'(satp.mode) == riscv::ModeOff || + riscv::vm_mode_t'(satp.mode) == riscv::MODE_SV) + satp_d = satp; + end + // changing the mode can have side-effects on address translation (e.g.: other instructions), re-fetch + // the next instruction by executing a flush + flush_o = 1'b1; + end else begin + update_access_exception = 1'b1; end - // changing the mode can have side-effects on address translation (e.g.: other instructions), re-fetch - // the next instruction by executing a flush - flush_o = 1'b1; end riscv::CSR_MSTATUS: begin @@ -726,19 +780,27 @@ module csr_regfile // machine exception delegation register // 0 - 15 exceptions supported riscv::CSR_MEDELEG: begin - mask = (1 << riscv::INSTR_ADDR_MISALIGNED) | - (1 << riscv::BREAKPOINT) | - (1 << riscv::ENV_CALL_UMODE) | - (1 << riscv::INSTR_PAGE_FAULT) | - (1 << riscv::LOAD_PAGE_FAULT) | - (1 << riscv::STORE_PAGE_FAULT); - medeleg_d = (medeleg_q & ~mask) | (csr_wdata & mask); + if (CVA6Cfg.RVS) begin + mask = (1 << riscv::INSTR_ADDR_MISALIGNED) | + (1 << riscv::BREAKPOINT) | + (1 << riscv::ENV_CALL_UMODE) | + (1 << riscv::INSTR_PAGE_FAULT) | + (1 << riscv::LOAD_PAGE_FAULT) | + (1 << riscv::STORE_PAGE_FAULT); + medeleg_d = (medeleg_q & ~mask) | (csr_wdata & mask); + end else begin + update_access_exception = 1'b1; + end end // machine interrupt delegation register // we do not support user interrupt delegation riscv::CSR_MIDELEG: begin - mask = riscv::MIP_SSIP | riscv::MIP_STIP | riscv::MIP_SEIP; - mideleg_d = (mideleg_q & ~mask) | (csr_wdata & mask); + if (CVA6Cfg.RVS) begin + mask = riscv::MIP_SSIP | riscv::MIP_STIP | riscv::MIP_SEIP; + mideleg_d = (mideleg_q & ~mask) | (csr_wdata & mask); + end else begin + update_access_exception = 1'b1; + end end // mask the register so that unsupported interrupts can never be set riscv::CSR_MIE: begin @@ -993,18 +1055,18 @@ module csr_regfile // a m-mode trap might be delegated if we are taking it in S mode // first figure out if this was an exception or an interrupt e.g.: look at bit (XLEN-1) // the cause register can only be $clog2(riscv::XLEN) bits long (as we only support XLEN exceptions) - if ((ex_i.cause[riscv::XLEN-1] && mideleg_q[ex_i.cause[$clog2( + if (CVA6Cfg.RVS && ((ex_i.cause[riscv::XLEN-1] && mideleg_q[ex_i.cause[$clog2( riscv::XLEN )-1:0]]) || (~ex_i.cause[riscv::XLEN-1] && medeleg_q[ex_i.cause[$clog2( riscv::XLEN - )-1:0]])) begin + )-1:0]]))) begin // traps never transition from a more-privileged mode to a less privileged mode // so if we are already in M mode, stay there trap_to_priv_lvl = (priv_lvl_o == riscv::PRIV_LVL_M) ? riscv::PRIV_LVL_M : riscv::PRIV_LVL_S; end // trap to supervisor mode - if (trap_to_priv_lvl == riscv::PRIV_LVL_S) begin + if (CVA6Cfg.RVS && trap_to_priv_lvl == riscv::PRIV_LVL_S) begin // update sstatus mstatus_d.sie = 1'b0; mstatus_d.spie = mstatus_q.sie; @@ -1071,8 +1133,10 @@ module csr_regfile set_debug_pc_o = dcsr_q.ebreakm; end riscv::PRIV_LVL_S: begin - debug_mode_d = dcsr_q.ebreaks; - set_debug_pc_o = dcsr_q.ebreaks; + if (CVA6Cfg.RVS) begin + debug_mode_d = dcsr_q.ebreaks; + set_debug_pc_o = dcsr_q.ebreaks; + end end riscv::PRIV_LVL_U: begin debug_mode_d = dcsr_q.ebreaku; @@ -1136,7 +1200,7 @@ module csr_regfile // ------------------------------ // Set the address translation at which the load and stores should occur // we can use the previous values since changing the address translation will always involve a pipeline flush - if (ariane_pkg::MMU_PRESENT && mprv && riscv::vm_mode_t'(satp_q.mode) == riscv::MODE_SV && (mstatus_q.mpp != riscv::PRIV_LVL_M)) + if (ariane_pkg::MMU_PRESENT && mprv && CVA6Cfg.RVS && riscv::vm_mode_t'(satp_q.mode) == riscv::MODE_SV && (mstatus_q.mpp != riscv::PRIV_LVL_M)) en_ld_st_translation_d = 1'b1; else // otherwise we go with the regular settings en_ld_st_translation_d = en_translation_o; @@ -1162,7 +1226,7 @@ module csr_regfile mstatus_d.mpie = 1'b1; end - if (sret) begin + if (CVA6Cfg.RVS && sret) begin // return from exception, IF doesn't care from where we are returning eret_o = 1'b1; // return the previous supervisor interrupt enable flag @@ -1203,10 +1267,12 @@ module csr_regfile CSR_CLEAR: csr_wdata = (~csr_wdata_i) & csr_rdata; CSR_READ: csr_we = 1'b0; SRET: begin - // the return should not have any write or read side-effects - csr_we = 1'b0; - csr_read = 1'b0; - sret = 1'b1; // signal a return from supervisor mode + if (CVA6Cfg.RVS) begin + // the return should not have any write or read side-effects + csr_we = 1'b0; + csr_read = 1'b0; + sret = 1'b1; // signal a return from supervisor mode + end end MRET: begin // the return should not have any write or read side-effects @@ -1262,7 +1328,7 @@ module csr_regfile if (csr_addr_i inside {[riscv::CSR_CYCLE : riscv::CSR_HPM_COUNTER_31]}) begin unique case (priv_lvl_o) riscv::PRIV_LVL_M: privilege_violation = 1'b0; - riscv::PRIV_LVL_S: privilege_violation = ~mcounteren_q[csr_addr_i[4:0]]; + riscv::PRIV_LVL_S: if (CVA6Cfg.RVS) privilege_violation = ~mcounteren_q[csr_addr_i[4:0]]; riscv::PRIV_LVL_U: privilege_violation = ~mcounteren_q[csr_addr_i[4:0]] & ~scounteren_q[csr_addr_i[4:0]]; endcase @@ -1313,7 +1379,7 @@ module csr_regfile always_comb begin : priv_output trap_vector_base_o = {mtvec_q[riscv::VLEN-1:2], 2'b0}; // output user mode stvec - if (trap_to_priv_lvl == riscv::PRIV_LVL_S) begin + if (CVA6Cfg.RVS && trap_to_priv_lvl == riscv::PRIV_LVL_S) begin trap_vector_base_o = {stvec_q[riscv::VLEN-1:2], 2'b0}; end @@ -1329,13 +1395,13 @@ module csr_regfile // activated for _that_ privilege level. if (ex_i.cause[riscv::XLEN-1] && ((trap_to_priv_lvl == riscv::PRIV_LVL_M && mtvec_q[0]) - || trap_to_priv_lvl == riscv::PRIV_LVL_S && stvec_q[0])) begin + || (CVA6Cfg.RVS && trap_to_priv_lvl == riscv::PRIV_LVL_S && stvec_q[0]))) begin trap_vector_base_o[7:2] = ex_i.cause[5:0]; end epc_o = mepc_q[riscv::VLEN-1:0]; // we are returning from supervisor mode, so take the sepc register - if (sret) begin + if (CVA6Cfg.RVS && sret) begin epc_o = sepc_q[riscv::VLEN-1:0]; end // we are returning from debug mode, to take the dpc register @@ -1358,8 +1424,10 @@ module csr_regfile csr_rdata_o = csr_rdata | ({{riscv::XLEN - 1{1'b0}}, irq_i[1]} << riscv::IRQ_S_EXT); // in supervisor mode we also need to check whether we delegated this bit riscv::CSR_SIP: begin - csr_rdata_o = csr_rdata - | ({{riscv::XLEN-1{1'b0}}, (irq_i[1] & mideleg_q[riscv::IRQ_S_EXT])} << riscv::IRQ_S_EXT); + if (CVA6Cfg.RVS) begin + csr_rdata_o = csr_rdata + | ({{riscv::XLEN-1{1'b0}}, (irq_i[1] & mideleg_q[riscv::IRQ_S_EXT])} << riscv::IRQ_S_EXT); + end end default: ; endcase @@ -1376,7 +1444,7 @@ module csr_regfile assign asid_o = satp_q.asid[AsidWidth-1:0]; assign sum_o = mstatus_q.sum; // we support bare memory addressing and SV39 - assign en_translation_o = (riscv::vm_mode_t'(satp_q.mode) == riscv::MODE_SV && + assign en_translation_o = ((CVA6Cfg.RVS && riscv::vm_mode_t'(satp_q.mode) == riscv::MODE_SV) && priv_lvl_o != riscv::PRIV_LVL_M) ? 1'b1 : 1'b0; @@ -1402,43 +1470,45 @@ module csr_regfile // sequential process always_ff @(posedge clk_i or negedge rst_ni) begin if (~rst_ni) begin - priv_lvl_q <= riscv::PRIV_LVL_M; + priv_lvl_q <= riscv::PRIV_LVL_M; // floating-point registers - fcsr_q <= '0; + fcsr_q <= '0; // debug signals - debug_mode_q <= 1'b0; - dcsr_q <= '0; - dcsr_q.prv <= riscv::PRIV_LVL_M; - dcsr_q.xdebugver <= 4'h4; - dpc_q <= '0; - dscratch0_q <= {riscv::XLEN{1'b0}}; - dscratch1_q <= {riscv::XLEN{1'b0}}; + debug_mode_q <= 1'b0; + dcsr_q <= '0; + dcsr_q.prv <= riscv::PRIV_LVL_M; + dcsr_q.xdebugver <= 4'h4; + dpc_q <= '0; + dscratch0_q <= {riscv::XLEN{1'b0}}; + dscratch1_q <= {riscv::XLEN{1'b0}}; // machine mode registers - mstatus_q <= 64'b0; + mstatus_q <= 64'b0; // set to boot address + direct mode + 4 byte offset which is the initial trap - mtvec_rst_load_q <= 1'b1; - mtvec_q <= '0; - medeleg_q <= {riscv::XLEN{1'b0}}; - mideleg_q <= {riscv::XLEN{1'b0}}; - mip_q <= {riscv::XLEN{1'b0}}; - mie_q <= {riscv::XLEN{1'b0}}; - mepc_q <= {riscv::XLEN{1'b0}}; - mcause_q <= {riscv::XLEN{1'b0}}; - mcounteren_q <= {riscv::XLEN{1'b0}}; - mscratch_q <= {riscv::XLEN{1'b0}}; - mtval_q <= {riscv::XLEN{1'b0}}; - dcache_q <= {{riscv::XLEN - 1{1'b0}}, 1'b1}; - icache_q <= {{riscv::XLEN - 1{1'b0}}, 1'b1}; - mcountinhibit_q <= '0; - acc_cons_q <= {{riscv::XLEN - 1{1'b0}}, CVA6Cfg.EnableAccelerator}; + mtvec_rst_load_q <= 1'b1; + mtvec_q <= '0; + mip_q <= {riscv::XLEN{1'b0}}; + mie_q <= {riscv::XLEN{1'b0}}; + mepc_q <= {riscv::XLEN{1'b0}}; + mcause_q <= {riscv::XLEN{1'b0}}; + mcounteren_q <= {riscv::XLEN{1'b0}}; + mscratch_q <= {riscv::XLEN{1'b0}}; + mtval_q <= {riscv::XLEN{1'b0}}; + dcache_q <= {{riscv::XLEN - 1{1'b0}}, 1'b1}; + icache_q <= {{riscv::XLEN - 1{1'b0}}, 1'b1}; + mcountinhibit_q <= '0; + acc_cons_q <= {{riscv::XLEN - 1{1'b0}}, CVA6Cfg.EnableAccelerator}; // supervisor mode registers - sepc_q <= {riscv::XLEN{1'b0}}; - scause_q <= {riscv::XLEN{1'b0}}; - stvec_q <= {riscv::XLEN{1'b0}}; - scounteren_q <= {riscv::XLEN{1'b0}}; - sscratch_q <= {riscv::XLEN{1'b0}}; - stval_q <= {riscv::XLEN{1'b0}}; - satp_q <= {riscv::XLEN{1'b0}}; + if (CVA6Cfg.RVS) begin + medeleg_q <= {riscv::XLEN{1'b0}}; + mideleg_q <= {riscv::XLEN{1'b0}}; + sepc_q <= {riscv::XLEN{1'b0}}; + scause_q <= {riscv::XLEN{1'b0}}; + stvec_q <= {riscv::XLEN{1'b0}}; + scounteren_q <= {riscv::XLEN{1'b0}}; + sscratch_q <= {riscv::XLEN{1'b0}}; + stval_q <= {riscv::XLEN{1'b0}}; + satp_q <= {riscv::XLEN{1'b0}}; + end // timer and counters cycle_q <= 64'b0; instret_q <= 64'b0; @@ -1450,40 +1520,42 @@ module csr_regfile pmpcfg_q <= '0; pmpaddr_q <= '0; end else begin - priv_lvl_q <= priv_lvl_d; + priv_lvl_q <= priv_lvl_d; // floating-point registers - fcsr_q <= fcsr_d; + fcsr_q <= fcsr_d; // debug signals - debug_mode_q <= debug_mode_d; - dcsr_q <= dcsr_d; - dpc_q <= dpc_d; - dscratch0_q <= dscratch0_d; - dscratch1_q <= dscratch1_d; + debug_mode_q <= debug_mode_d; + dcsr_q <= dcsr_d; + dpc_q <= dpc_d; + dscratch0_q <= dscratch0_d; + dscratch1_q <= dscratch1_d; // machine mode registers - mstatus_q <= mstatus_d; - mtvec_rst_load_q <= 1'b0; - mtvec_q <= mtvec_d; - medeleg_q <= medeleg_d; - mideleg_q <= mideleg_d; - mip_q <= mip_d; - mie_q <= mie_d; - mepc_q <= mepc_d; - mcause_q <= mcause_d; - mcounteren_q <= mcounteren_d; - mscratch_q <= mscratch_d; - mtval_q <= mtval_d; - dcache_q <= dcache_d; - icache_q <= icache_d; - mcountinhibit_q <= mcountinhibit_d; - acc_cons_q <= acc_cons_d; + mstatus_q <= mstatus_d; + mtvec_rst_load_q <= 1'b0; + mtvec_q <= mtvec_d; + mip_q <= mip_d; + mie_q <= mie_d; + mepc_q <= mepc_d; + mcause_q <= mcause_d; + mcounteren_q <= mcounteren_d; + mscratch_q <= mscratch_d; + mtval_q <= mtval_d; + dcache_q <= dcache_d; + icache_q <= icache_d; + mcountinhibit_q <= mcountinhibit_d; + acc_cons_q <= acc_cons_d; // supervisor mode registers - sepc_q <= sepc_d; - scause_q <= scause_d; - stvec_q <= stvec_d; - scounteren_q <= scounteren_d; - sscratch_q <= sscratch_d; - stval_q <= stval_d; - satp_q <= satp_d; + if (CVA6Cfg.RVS) begin + medeleg_q <= medeleg_d; + mideleg_q <= mideleg_d; + sepc_q <= sepc_d; + scause_q <= scause_d; + stvec_q <= stvec_d; + scounteren_q <= scounteren_d; + sscratch_q <= sscratch_d; + stval_q <= stval_d; + satp_q <= satp_d; + end // timer and counters cycle_q <= cycle_d; instret_q <= instret_d; diff --git a/core/cva6.sv b/core/cva6.sv index bd3f60a3bc..6cef93662f 100644 --- a/core/cva6.sv +++ b/core/cva6.sv @@ -194,6 +194,7 @@ module cva6 unsigned'(NrRgprPorts), unsigned'(NrWbPorts), bit'(EnableAccelerator), + CVA6Cfg.RVS, CVA6Cfg.HaltAddress, CVA6Cfg.ExceptionAddress, CVA6Cfg.RASDepth, @@ -1306,7 +1307,7 @@ module cva6 else begin case (priv_lvl) riscv::PRIV_LVL_M: mode = "M"; - riscv::PRIV_LVL_S: mode = "S"; + riscv::PRIV_LVL_S: if(CVA6Cfg.RVS) mode = "S"; riscv::PRIV_LVL_U: mode = "U"; default: ; // Do nothing endcase diff --git a/core/decoder.sv b/core/decoder.sv index 43ff99bf29..fc1a52fa49 100644 --- a/core/decoder.sv +++ b/core/decoder.sv @@ -143,19 +143,21 @@ module decoder 12'b1: ebreak = 1'b1; // SRET 12'b1_0000_0010: begin - instruction_o.op = ariane_pkg::SRET; - // check privilege level, SRET can only be executed in S and M mode - // we'll just decode an illegal instruction if we are in the wrong privilege level - if (priv_lvl_i == riscv::PRIV_LVL_U) begin - illegal_instr = 1'b1; - // do not change privilege level if this is an illegal instruction - instruction_o.op = ariane_pkg::ADD; - end - // if we are in S-Mode and Trap SRET (tsr) is set -> trap on illegal instruction - if (priv_lvl_i == riscv::PRIV_LVL_S && tsr_i) begin - illegal_instr = 1'b1; - // do not change privilege level if this is an illegal instruction - instruction_o.op = ariane_pkg::ADD; + if (CVA6Cfg.RVS) begin + instruction_o.op = ariane_pkg::SRET; + // check privilege level, SRET can only be executed in S and M mode + // we'll just decode an illegal instruction if we are in the wrong privilege level + if (priv_lvl_i == riscv::PRIV_LVL_U) begin + illegal_instr = 1'b1; + // do not change privilege level if this is an illegal instruction + instruction_o.op = ariane_pkg::ADD; + end + // if we are in S-Mode and Trap SRET (tsr) is set -> trap on illegal instruction + if (priv_lvl_i == riscv::PRIV_LVL_S && tsr_i) begin + illegal_instr = 1'b1; + // do not change privilege level if this is an illegal instruction + instruction_o.op = ariane_pkg::ADD; + end end end // MRET @@ -163,7 +165,7 @@ module decoder instruction_o.op = ariane_pkg::MRET; // check privilege level, MRET can only be executed in M mode // otherwise we decode an illegal instruction - if (priv_lvl_i inside {riscv::PRIV_LVL_U, riscv::PRIV_LVL_S}) + if ((CVA6Cfg.RVS && priv_lvl_i == riscv::PRIV_LVL_S) || priv_lvl_i == riscv::PRIV_LVL_U) illegal_instr = 1'b1; end // DRET @@ -177,7 +179,7 @@ module decoder if (ENABLE_WFI) instruction_o.op = ariane_pkg::WFI; // if timeout wait is set, trap on an illegal instruction in S Mode // (after 0 cycles timeout) - if (priv_lvl_i == riscv::PRIV_LVL_S && tw_i) begin + if (CVA6Cfg.RVS && priv_lvl_i == riscv::PRIV_LVL_S && tw_i) begin illegal_instr = 1'b1; instruction_o.op = ariane_pkg::ADD; end @@ -192,10 +194,11 @@ module decoder if (instr.instr[31:25] == 7'b1001) begin // check privilege level, SFENCE.VMA can only be executed in M/S mode // otherwise decode an illegal instruction - illegal_instr = ((priv_lvl_i inside {riscv::PRIV_LVL_M, riscv::PRIV_LVL_S}) && instr.itype.rd == '0) ? 1'b0 : 1'b1; + illegal_instr = (((CVA6Cfg.RVS && priv_lvl_i == riscv::PRIV_LVL_S) || priv_lvl_i == riscv::PRIV_LVL_M) && instr.itype.rd == '0) ? 1'b0 : 1'b1; instruction_o.op = ariane_pkg::SFENCE_VMA; // check TVM flag and intercept SFENCE.VMA call if necessary - if (priv_lvl_i == riscv::PRIV_LVL_S && tvm_i) illegal_instr = 1'b1; + if (CVA6Cfg.RVS && priv_lvl_i == riscv::PRIV_LVL_S && tvm_i) + illegal_instr = 1'b1; end else begin illegal_instr = 1'b1; end @@ -1317,7 +1320,7 @@ module decoder // depending on the privilege mode, set the appropriate cause case (priv_lvl_i) riscv::PRIV_LVL_M: instruction_o.ex.cause = riscv::ENV_CALL_MMODE; - riscv::PRIV_LVL_S: instruction_o.ex.cause = riscv::ENV_CALL_SMODE; + riscv::PRIV_LVL_S: if (CVA6Cfg.RVS) instruction_o.ex.cause = riscv::ENV_CALL_SMODE; riscv::PRIV_LVL_U: instruction_o.ex.cause = riscv::ENV_CALL_UMODE; default: ; // this should not happen endcase @@ -1390,7 +1393,7 @@ module decoder // mode equals the delegated privilege mode (S or U) and that mode’s interrupt enable bit // (SIE or UIE in mstatus) is set, or if the current privilege mode is less than the delegated privilege mode. if (irq_ctrl_i.mideleg[interrupt_cause[$clog2(riscv::XLEN)-1:0]]) begin - if ((irq_ctrl_i.sie && priv_lvl_i == riscv::PRIV_LVL_S) || priv_lvl_i == riscv::PRIV_LVL_U) begin + if ((CVA6Cfg.RVS && irq_ctrl_i.sie && priv_lvl_i == riscv::PRIV_LVL_S) || priv_lvl_i == riscv::PRIV_LVL_U) begin instruction_o.ex.valid = 1'b1; instruction_o.ex.cause = interrupt_cause; end diff --git a/core/include/config_pkg.sv b/core/include/config_pkg.sv index 66d3b39b91..b670fcb82c 100644 --- a/core/include/config_pkg.sv +++ b/core/include/config_pkg.sv @@ -71,6 +71,7 @@ package config_pkg; int unsigned NrRgprPorts; int unsigned NrWbPorts; bit EnableAccelerator; + bit RVS; //Supervisor mode // Debug Module // address to which a hart should jump when it was requested to halt logic [63:0] HaltAddress; diff --git a/core/include/cv32a60x_config_pkg.sv b/core/include/cv32a60x_config_pkg.sv index 0e90226793..e48e831e67 100644 --- a/core/include/cv32a60x_config_pkg.sv +++ b/core/include/cv32a60x_config_pkg.sv @@ -106,6 +106,7 @@ package cva6_config_pkg; NrRgprPorts: unsigned'(0), NrWbPorts: unsigned'(0), EnableAccelerator: bit'(0), + RVS: bit'(1), HaltAddress: 64'h800, ExceptionAddress: 64'h808, RASDepth: unsigned'(CVA6ConfigRASDepth), diff --git a/core/include/cv32a6_embedded_config_pkg.sv b/core/include/cv32a6_embedded_config_pkg.sv index 4983ee8952..0ae4ab3baa 100644 --- a/core/include/cv32a6_embedded_config_pkg.sv +++ b/core/include/cv32a6_embedded_config_pkg.sv @@ -105,6 +105,7 @@ package cva6_config_pkg; NrRgprPorts: unsigned'(0), NrWbPorts: unsigned'(0), EnableAccelerator: bit'(0), + RVS: bit'(0), HaltAddress: 64'h800, ExceptionAddress: 64'h808, RASDepth: unsigned'(CVA6ConfigRASDepth), diff --git a/core/include/cv32a6_ima_sv32_fpga_config_pkg.sv b/core/include/cv32a6_ima_sv32_fpga_config_pkg.sv index d6b42e7dab..bab4e897a6 100644 --- a/core/include/cv32a6_ima_sv32_fpga_config_pkg.sv +++ b/core/include/cv32a6_ima_sv32_fpga_config_pkg.sv @@ -106,6 +106,7 @@ package cva6_config_pkg; NrRgprPorts: unsigned'(0), NrWbPorts: unsigned'(0), EnableAccelerator: bit'(0), + RVS: bit'(1), HaltAddress: 64'h800, ExceptionAddress: 64'h808, RASDepth: unsigned'(CVA6ConfigRASDepth), diff --git a/core/include/cv32a6_imac_sv0_config_pkg.sv b/core/include/cv32a6_imac_sv0_config_pkg.sv index 2035fbae40..135751728a 100644 --- a/core/include/cv32a6_imac_sv0_config_pkg.sv +++ b/core/include/cv32a6_imac_sv0_config_pkg.sv @@ -106,6 +106,7 @@ package cva6_config_pkg; NrRgprPorts: unsigned'(0), NrWbPorts: unsigned'(0), EnableAccelerator: bit'(0), + RVS: bit'(1), HaltAddress: 64'h800, ExceptionAddress: 64'h808, RASDepth: unsigned'(CVA6ConfigRASDepth), diff --git a/core/include/cv32a6_imac_sv32_config_pkg.sv b/core/include/cv32a6_imac_sv32_config_pkg.sv index 2f91a18104..39b598092b 100644 --- a/core/include/cv32a6_imac_sv32_config_pkg.sv +++ b/core/include/cv32a6_imac_sv32_config_pkg.sv @@ -106,6 +106,7 @@ package cva6_config_pkg; NrRgprPorts: unsigned'(0), NrWbPorts: unsigned'(0), EnableAccelerator: bit'(0), + RVS: bit'(1), HaltAddress: 64'h800, ExceptionAddress: 64'h808, RASDepth: unsigned'(CVA6ConfigRASDepth), diff --git a/core/include/cv32a6_imafc_sv32_config_pkg.sv b/core/include/cv32a6_imafc_sv32_config_pkg.sv index df061d065e..f09bfb8eae 100644 --- a/core/include/cv32a6_imafc_sv32_config_pkg.sv +++ b/core/include/cv32a6_imafc_sv32_config_pkg.sv @@ -106,6 +106,7 @@ package cva6_config_pkg; NrRgprPorts: unsigned'(0), NrWbPorts: unsigned'(0), EnableAccelerator: bit'(0), + RVS: bit'(1), HaltAddress: 64'h800, ExceptionAddress: 64'h808, RASDepth: unsigned'(CVA6ConfigRASDepth), diff --git a/core/include/cv64a6_imadfcv_sv39_polara_config_pkg.sv b/core/include/cv64a6_imadfcv_sv39_polara_config_pkg.sv index 23cf5ff77b..765ceeee74 100644 --- a/core/include/cv64a6_imadfcv_sv39_polara_config_pkg.sv +++ b/core/include/cv64a6_imadfcv_sv39_polara_config_pkg.sv @@ -105,6 +105,7 @@ package cva6_config_pkg; NrRgprPorts: unsigned'(0), NrWbPorts: unsigned'(0), EnableAccelerator: bit'(0), + RVS: bit'(1), HaltAddress: 64'h800, ExceptionAddress: 64'h808, RASDepth: unsigned'(CVA6ConfigRASDepth), diff --git a/core/include/cv64a6_imafdc_sv39_config_pkg.sv b/core/include/cv64a6_imafdc_sv39_config_pkg.sv index 183bcb3b58..9aee48aa21 100644 --- a/core/include/cv64a6_imafdc_sv39_config_pkg.sv +++ b/core/include/cv64a6_imafdc_sv39_config_pkg.sv @@ -106,6 +106,7 @@ package cva6_config_pkg; NrRgprPorts: unsigned'(0), NrWbPorts: unsigned'(0), EnableAccelerator: bit'(0), + RVS: bit'(1), HaltAddress: 64'h800, ExceptionAddress: 64'h808, RASDepth: unsigned'(CVA6ConfigRASDepth), diff --git a/core/include/cv64a6_imafdc_sv39_hpdcache_config_pkg.sv b/core/include/cv64a6_imafdc_sv39_hpdcache_config_pkg.sv index 98a831fd7b..0f9a401682 100644 --- a/core/include/cv64a6_imafdc_sv39_hpdcache_config_pkg.sv +++ b/core/include/cv64a6_imafdc_sv39_hpdcache_config_pkg.sv @@ -113,6 +113,7 @@ package cva6_config_pkg; NrRgprPorts: unsigned'(0), NrWbPorts: unsigned'(0), EnableAccelerator: bit'(0), + RVS: bit'(1), HaltAddress: 64'h800, ExceptionAddress: 64'h808, RASDepth: unsigned'(CVA6ConfigRASDepth), diff --git a/core/include/cv64a6_imafdc_sv39_openpiton_config_pkg.sv b/core/include/cv64a6_imafdc_sv39_openpiton_config_pkg.sv index 9f44694bc9..083952bf63 100644 --- a/core/include/cv64a6_imafdc_sv39_openpiton_config_pkg.sv +++ b/core/include/cv64a6_imafdc_sv39_openpiton_config_pkg.sv @@ -106,6 +106,7 @@ package cva6_config_pkg; NrRgprPorts: unsigned'(0), NrWbPorts: unsigned'(0), EnableAccelerator: bit'(0), + RVS: bit'(1), HaltAddress: 64'h800, ExceptionAddress: 64'h808, RASDepth: unsigned'(CVA6ConfigRASDepth), diff --git a/core/include/cv64a6_imafdc_sv39_wb_config_pkg.sv b/core/include/cv64a6_imafdc_sv39_wb_config_pkg.sv index c9670d4ae2..deaa6da9a4 100644 --- a/core/include/cv64a6_imafdc_sv39_wb_config_pkg.sv +++ b/core/include/cv64a6_imafdc_sv39_wb_config_pkg.sv @@ -106,6 +106,7 @@ package cva6_config_pkg; NrRgprPorts: unsigned'(0), NrWbPorts: unsigned'(0), EnableAccelerator: bit'(0), + RVS: bit'(1), HaltAddress: 64'h800, ExceptionAddress: 64'h808, RASDepth: unsigned'(CVA6ConfigRASDepth), diff --git a/core/include/cv64a6_imafdcv_sv39_config_pkg.sv b/core/include/cv64a6_imafdcv_sv39_config_pkg.sv index dd464b3ddb..a323d04013 100644 --- a/core/include/cv64a6_imafdcv_sv39_config_pkg.sv +++ b/core/include/cv64a6_imafdcv_sv39_config_pkg.sv @@ -105,6 +105,7 @@ package cva6_config_pkg; NrRgprPorts: unsigned'(0), NrWbPorts: unsigned'(0), EnableAccelerator: bit'(0), + RVS: bit'(1), HaltAddress: 64'h800, ExceptionAddress: 64'h808, RASDepth: unsigned'(CVA6ConfigRASDepth), diff --git a/corev_apu/fpga/src/ariane_xilinx.sv b/corev_apu/fpga/src/ariane_xilinx.sv index 944df2b484..326ffddcca 100644 --- a/corev_apu/fpga/src/ariane_xilinx.sv +++ b/corev_apu/fpga/src/ariane_xilinx.sv @@ -190,6 +190,7 @@ localparam config_pkg::cva6_cfg_t CVA6Cfg = '{ NrRgprPorts: unsigned'(0), NrWbPorts: unsigned'(0), EnableAccelerator: bit'(0), + RVS: bit'(1), HaltAddress: dm::HaltAddress, ExceptionAddress: dm::ExceptionAddress, DmBaseAddress: ariane_soc::DebugBase,