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// 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 <https://www.gnu.org/licenses/>.
// 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] INT_U_SOFTWARE = 64'd0; // User Mode Software Interrupt
localparam logic [XLEN-1:0] INT_U_TIMER = 64'd4; // User Mode Timer Interrupt
localparam logic [XLEN-1:0] INT_U_EXTERNAL = 64'd8; // User Mode External Interrupt
// Supervisor Mode Interrupts
localparam logic [XLEN-1:0] INT_S_SOFTWARE = 64'd1; // Supervisor Mode Software Interrupt
localparam logic [XLEN-1:0] INT_S_TIMER = 64'd5; // Supervisor Mode Timer Interrupt
localparam logic [XLEN-1:0] INT_S_EXTERNAL = 64'd9; // Supervisor Mode External Interrupt
// Machine Mode Interrupts
localparam logic [XLEN-1:0] INT_M_SOFTWARE = 64'd3; // Machine Mode Software Interrupt
localparam logic [XLEN-1:0] INT_M_TIMER = 64'd7; // Machine Mode Timer Interrupt
localparam logic [XLEN-1:0] INT_M_EXTERNAL = 64'd11; // Machine Mode External Interrupt
endpackage
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