// Richard CPU // Copyright (C) 2026 Richard Qin // This program is free software: you can redistribute it and/or modify // it under the terms of the GNU General Public License as published by // the Free Software Foundation, either version 3 of the License, or // (at your option) any later version. // This program is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // You should have received a copy of the GNU General Public License // along with this program. If not, see . // File path: rtl/core/include/csr_pkg.sv // Description: Global enumerations, address definitions, and exception reason constants related to CSR and privilege-level architecture package csr_pkg; import rv64_pkg::*; typedef enum logic [2:0] { CSR_OP_NONE = 3'b000, CSR_OP_WRITE = 3'b001, CSR_OP_SET = 3'b010, CSR_OP_CLEAR = 3'b011 } csr_op_t; // --------------------------------- // Floating-Point CSRs // --------------------------------- localparam logic [11:0] CSR_FFLAGS = 12'h001; // Floating-Point accrued exception flags localparam logic [11:0] CSR_FRM = 12'h002; // Floating-Point dynamic rounding mode localparam logic [11:0] CSR_FCSR = 12'h003; // Combined fflags/frm register // --------------------------------- // Machine Mode CSRs (M-Mode) // --------------------------------- localparam logic [11:0] CSR_MVENDORID = 12'hF11; // Vendor ID localparam logic [11:0] CSR_MARCHID = 12'hF12; // Architecture ID localparam logic [11:0] CSR_MIMPID = 12'hF13; // Implementation ID localparam logic [11:0] CSR_MHARTID = 12'hF14; // Hart ID localparam logic [11:0] CSR_MSTATUS = 12'h300; // Machine Status Register localparam logic [11:0] CSR_MISA = 12'h301; // Machine ISA Register localparam logic [11:0] CSR_MEDELEG = 12'h302; // Exception Delegation localparam logic [11:0] CSR_MIDELEG = 12'h303; // Interrupt Delegation localparam logic [11:0] CSR_MIE = 12'h304; // Machine Interrupt Enable Register localparam logic [11:0] CSR_MTVEC = 12'h305; // Machine Trap Vector Register localparam logic [11:0] CSR_MCOUNTEREN= 12'h306; // Machine Counter Enable Register localparam logic [11:0] CSR_MSCRATCH = 12'h340; // Machine Scratch Register localparam logic [11:0] CSR_MEPC = 12'h341; // Machine Exception Program Counter localparam logic [11:0] CSR_MCAUSE = 12'h342; // Machine Cause Register localparam logic [11:0] CSR_MTVAL = 12'h343; // Machine Trap Value Register localparam logic [11:0] CSR_MIP = 12'h344; // Machine Interrupt Pending Register localparam logic [11:0] CSR_MCYCLE = 12'hB00; // Machine Cycle Counter localparam logic [11:0] CSR_MINSTRET = 12'hB02; // Machine Instruction Retired Counter // --------------------------------- // Supervisor Mode CSRs (S-Mode) // --------------------------------- localparam logic [11:0] CSR_SSTATUS = 12'h100; // Supervisor Status Register localparam logic [11:0] CSR_SIE = 12'h104; // Supervisor Interrupt Enable Register localparam logic [11:0] CSR_STVEC = 12'h105; // Supervisor Trap Vector Register localparam logic [11:0] CSR_SCOUNTEREN= 12'h106; // Supervisor Counter Enable Register localparam logic [11:0] CSR_SSCRATCH = 12'h140; // Supervisor Scratch Register localparam logic [11:0] CSR_SEPC = 12'h141; // Supervisor Exception Program Counter localparam logic [11:0] CSR_SCAUSE = 12'h142; // Supervisor Cause Register localparam logic [11:0] CSR_STVAL = 12'h143; // Supervisor Trap Value Register localparam logic [11:0] CSR_SIP = 12'h144; // Supervisor Interrupt Pending Register localparam logic [11:0] CSR_SATP = 12'h180; // Supervisor Address Translation and Protection Register // --------------------------------- // User Mode CSRs (U-Mode / URW) // --------------------------------- localparam logic [11:0] CSR_CYCLE = 12'hC00; // Cycle Counter localparam logic [11:0] CSR_TIME = 12'hC01; // Timer Counter localparam logic [11:0] CSR_INSTRET = 12'hC02; // Instruction Retired Counter // --------------------------------- // Exception Cause Codes (mcause.Interrupt == 0) // --------------------------------- localparam logic [XLEN-1:0] EXC_INST_ADDR_MISALIGNED = 64'd0; // Instruction Address Misaligned localparam logic [XLEN-1:0] EXC_INST_FAULT = 64'd1; // Instruction Access Fault localparam logic [XLEN-1:0] EXC_INST_ILLEGAL = 64'd2; // Illegal Instruction localparam logic [XLEN-1:0] EXC_BREAKPOINT = 64'd3; // Breakpoint localparam logic [XLEN-1:0] EXC_LOAD_ADDR_MISALIGNED = 64'd4; // Load Address Misaligned localparam logic [XLEN-1:0] EXC_LOAD_FAULT = 64'd5; // Load Access Fault localparam logic [XLEN-1:0] EXC_STORE_ADDR_MISALIGNED = 64'd6; // Store Address Misaligned localparam logic [XLEN-1:0] EXC_STORE_FAULT = 64'd7; // Store Access Fault localparam logic [XLEN-1:0] EXC_ECALL_FROM_U = 64'd8; // Environment Call from U-Mode localparam logic [XLEN-1:0] EXC_ECALL_FROM_S = 64'd9; // Environment Call from S-Mode localparam logic [XLEN-1:0] EXC_ECALL_FROM_M = 64'd11; // Environment Call from M-Mode localparam logic [XLEN-1:0] EXC_INSTR_PAGE_FAULT = 64'd12; // Instruction Page Fault localparam logic [XLEN-1:0] EXC_LOAD_PAGE_FAULT = 64'd13; // Load Page Fault localparam logic [XLEN-1:0] EXC_STORE_PAGE_FAULT = 64'd15; // Store Page Fault // --------------------------------- // Interrupt Cause Codes (mcause.Interrupt == 1) // --------------------------------- // User Mode Interrupts localparam logic [XLEN-1:0] INTERRUPT_U_SOFTWARE = 64'd0; // User Mode Software Interrupt localparam logic [XLEN-1:0] INTERRUPT_U_TIMER = 64'd4; // User Mode Timer Interrupt localparam logic [XLEN-1:0] INTERRUPT_U_EXTERNAL = 64'd8; // User Mode External Interrupt // Supervisor Mode Interrupts localparam logic [XLEN-1:0] INTERRUPT_S_SOFTWARE = 64'd1; // Supervisor Mode Software Interrupt localparam logic [XLEN-1:0] INTERRUPT_S_TIMER = 64'd5; // Supervisor Mode Timer Interrupt localparam logic [XLEN-1:0] INTERRUPT_S_EXTERNAL = 64'd9; // Supervisor Mode External Interrupt // Machine Mode Interrupts localparam logic [XLEN-1:0] INTERRUPT_M_SOFTWARE = 64'd3; // Machine Mode Software Interrupt localparam logic [XLEN-1:0] INTERRUPT_M_TIMER = 64'd7; // Machine Mode Timer Interrupt localparam logic [XLEN-1:0] INTERRUPT_M_EXTERNAL = 64'd11; // Machine Mode External Interrupt endpackage