2021-05-21 09:34:16 +08:00
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// ALU operation selectors
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2021-11-26 06:58:49 +08:00
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localparam ALUOP_ADD = 6'h00;
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localparam ALUOP_SUB = 6'h01;
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localparam ALUOP_LT = 6'h02;
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localparam ALUOP_LTU = 6'h04;
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localparam ALUOP_AND = 6'h06;
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localparam ALUOP_OR = 6'h07;
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localparam ALUOP_XOR = 6'h08;
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localparam ALUOP_SRL = 6'h09;
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localparam ALUOP_SRA = 6'h0a;
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localparam ALUOP_SLL = 6'h0b;
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localparam ALUOP_MULDIV = 6'h0c;
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// Bitmanip ALU operations:
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localparam ALUOP_SH1ADD = 6'h20;
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localparam ALUOP_SH2ADD = 6'h21;
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localparam ALUOP_SH3ADD = 6'h22;
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localparam ALUOP_CLZ = 6'h23;
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localparam ALUOP_CPOP = 6'h24;
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localparam ALUOP_CTZ = 6'h25;
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localparam ALUOP_ANDN = 6'h26; // Same LSBs as non-inverted
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localparam ALUOP_ORN = 6'h27; // Same LSBs as non-inverted
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localparam ALUOP_XNOR = 6'h28; // Same LSBs as non-inverted
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localparam ALUOP_MAX = 6'h29;
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localparam ALUOP_MAXU = 6'h2a;
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localparam ALUOP_MIN = 6'h2b;
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localparam ALUOP_MINU = 6'h2c;
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localparam ALUOP_ORC_B = 6'h2d;
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localparam ALUOP_REV8 = 6'h2e;
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localparam ALUOP_ROL = 6'h2f;
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localparam ALUOP_ROR = 6'h30;
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localparam ALUOP_SEXT_B = 6'h31;
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localparam ALUOP_SEXT_H = 6'h32;
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localparam ALUOP_ZEXT_H = 6'h33;
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localparam ALUOP_CLMUL = 6'h34;
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localparam ALUOP_CLMULH = 6'h35;
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localparam ALUOP_CLMULR = 6'h36;
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localparam ALUOP_BCLR = 6'h37;
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localparam ALUOP_BEXT = 6'h38;
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localparam ALUOP_BINV = 6'h39;
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localparam ALUOP_BSET = 6'h3a;
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2021-05-21 09:34:16 +08:00
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// Parameters to control ALU input muxes. Bypass mux paths are
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// controlled by X, so D has no parameters to choose these.
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2021-11-26 06:58:49 +08:00
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localparam ALUSRCA_RS1 = 1'h0;
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localparam ALUSRCA_PC = 1'h1;
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2021-05-21 09:34:16 +08:00
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2021-11-26 06:58:49 +08:00
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localparam ALUSRCB_RS2 = 1'h0;
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localparam ALUSRCB_IMM = 1'h1;
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2021-05-21 09:34:16 +08:00
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localparam MEMOP_LW = 4'h0;
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localparam MEMOP_LH = 4'h1;
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localparam MEMOP_LB = 4'h2;
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localparam MEMOP_LHU = 4'h3;
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localparam MEMOP_LBU = 4'h4;
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localparam MEMOP_SW = 4'h5;
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localparam MEMOP_SH = 4'h6;
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localparam MEMOP_SB = 4'h7;
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localparam MEMOP_NONE = 4'h8;
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localparam BCOND_NEVER = 2'h0;
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localparam BCOND_ALWAYS = 2'h1;
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localparam BCOND_ZERO = 2'h2;
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localparam BCOND_NZERO = 2'h3;
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// CSR access types
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localparam CSR_WTYPE_W = 2'h0;
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localparam CSR_WTYPE_S = 2'h1;
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localparam CSR_WTYPE_C = 2'h2;
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// Exceptional condition signals which travel alongside (or instead of)
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// instructions in the pipeline. These are speculative and can be flushed
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// on e.g. branch mispredict
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2021-05-23 18:59:46 +08:00
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// These mostly align with mcause values.
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2021-05-21 09:34:16 +08:00
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2021-05-23 18:59:46 +08:00
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localparam EXCEPT_NONE = 4'hf;
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localparam EXCEPT_INSTR_MISALIGN = 4'h0;
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localparam EXCEPT_INSTR_FAULT = 4'h1;
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localparam EXCEPT_INSTR_ILLEGAL = 4'h2;
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localparam EXCEPT_EBREAK = 4'h3;
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localparam EXCEPT_LOAD_ALIGN = 4'h4;
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localparam EXCEPT_LOAD_FAULT = 4'h5;
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localparam EXCEPT_STORE_ALIGN = 4'h6;
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localparam EXCEPT_STORE_FAULT = 4'h7;
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localparam EXCEPT_MRET = 4'ha; // Not really an exception, but handled like one
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localparam EXCEPT_ECALL = 4'hb;
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2021-05-21 09:34:16 +08:00
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// Operations for M extension (these are just instr[14:12])
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localparam M_OP_MUL = 3'h0;
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localparam M_OP_MULH = 3'h1;
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localparam M_OP_MULHSU = 3'h2;
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localparam M_OP_MULHU = 3'h3;
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localparam M_OP_DIV = 3'h4;
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localparam M_OP_DIVU = 3'h5;
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localparam M_OP_REM = 3'h6;
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localparam M_OP_REMU = 3'h7;
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