1 files changed, 195 insertions, 0 deletions
diff --git a/rtl/core/core_decode.sv b/rtl/core/core_decode.sv
new file mode 100644
index 0000000..b43c239
--- /dev/null
+++ b/rtl/core/core_decode.sv
@@ -0,0 +1,195 @@
+`include "core/isa.sv"
+`include "core/uarch.sv"
+
+module core_decode
+(
+	input  word        insn,
+
+	output insn_decode dec
+);
+
+	mul_decode dec_mul;
+	psr_decode dec_psr;
+	snd_decode dec_snd;
+	ctrl_decode dec_ctrl;
+	data_decode dec_data;
+	ldst_decode dec_ldst;
+	branch_decode dec_branch;
+	coproc_decode dec_coproc;
+
+	assign dec.mul = dec_mul;
+	assign dec.psr = dec_psr;
+	assign dec.snd = dec_snd;
+	assign dec.ctrl = dec_ctrl;
+	assign dec.data = dec_data;
+	assign dec.ldst = dec_ldst;
+	assign dec.branch = dec_branch;
+	assign dec.coproc = dec_coproc;
+
+	assign dec_ctrl.nop = 0;
+	assign dec_ctrl.mul = mul;
+	assign dec_ctrl.swi = swi;
+	assign dec_ctrl.psr = psr;
+	assign dec_ctrl.ldst = ldst;
+	assign dec_ctrl.bkpt = bkpt;
+	assign dec_ctrl.branch = branch;
+	assign dec_ctrl.coproc = coproc;
+	assign dec_ctrl.execute = execute;
+	assign dec_ctrl.writeback = writeback;
+	assign dec_ctrl.undefined = undefined;
+	assign dec_ctrl.conditional = conditional;
+
+	assign dec_psr.saved = psr_saved;
+	assign dec_psr.write = psr_write;
+	assign dec_psr.wr_flags = psr_wr_flags;
+	assign dec_psr.wr_control = psr_wr_control;
+	assign dec_psr.update_flags = update_flags;
+	assign dec_psr.restore_spsr = restore_spsr;
+
+	logic execute, undefined, conditional, writeback, update_flags,
+	      restore_spsr, branch, ldst, mul, swi, psr, coproc, bkpt,
+	      psr_saved, psr_write, psr_wr_flags, psr_wr_control;
+
+	core_decode_mux mux
+	(
+		.*
+	);
+
+	logic snd_is_imm, snd_ror_if_imm, snd_shift_by_reg_if_reg, snd_undefined;
+	snd_decode snd;
+
+	core_decode_snd snd_operand
+	(
+		.decode(snd),
+		.is_imm(snd_is_imm),
+		.ror_if_imm(snd_ror_if_imm),
+		.shift_by_reg_if_reg(snd_shift_by_reg_if_reg),
+		.undefined(snd_undefined),
+		.*
+	);
+
+	logic branch_link;
+
+	core_decode_branch group_branch
+	(
+		.link(branch_link),
+		.offset(dec_branch.offset),
+		.*
+	);
+
+	data_decode data;
+	logic data_writeback, data_update_flags, data_restore_spsr,
+	      data_is_imm, data_shift_by_reg_if_reg, data_conditional;
+
+	core_decode_data group_data
+	(
+		.decode(data),
+		.writeback(data_writeback),
+		.conditional(data_conditional),
+		.update_flags(data_update_flags),
+		.restore_spsr(data_restore_spsr),
+		.snd_is_imm(data_is_imm),
+		.snd_shift_by_reg_if_reg(data_shift_by_reg_if_reg),
+		.*
+	);
+
+	logic ldst_single_is_imm;
+	ldst_decode ldst_single;
+
+	core_decode_ldst_single group_ldst_single
+	(
+		.snd_is_imm(ldst_single_is_imm),
+		.decode(ldst_single),
+		.*
+	);
+
+	ldst_decode ldst_misc;
+	logic ldst_misc_off_is_imm;
+	reg_num ldst_misc_off_reg;
+	logic[7:0] ldst_misc_off_imm;
+
+	core_decode_ldst_misc group_ldst_misc
+	(
+		.decode(ldst_misc),
+		.off_imm(ldst_misc_off_imm),
+		.off_reg(ldst_misc_off_reg),
+		.off_is_imm(ldst_misc_off_is_imm),
+		.*
+	);
+
+	logic ldst_mult_restore_spsr;
+	ldst_decode ldst_multiple;
+
+	core_decode_ldst_multiple group_ldst_multiple
+	(
+		.decode(ldst_multiple),
+		.restore_spsr(ldst_mult_restore_spsr),
+		.*
+	);
+
+	reg_num ldst_ex_snd_r;
+	ldst_decode ldst_exclusive;
+
+	core_decode_ldst_exclusive group_ldst_ex
+	(
+		.snd_r(ldst_ex_snd_r),
+		.decode(ldst_exclusive),
+		.*
+	);
+
+	ldst_decode ldst_addr;
+	data_decode data_ldst;
+
+	core_decode_ldst_addr ldst2data
+	(
+		.ldst(ldst_addr),
+		.alu(data_ldst)
+	);
+
+	logic mul_update_flags;
+	reg_num mul_rd, mul_rs, mul_rm;
+
+	core_decode_mul group_mul
+	(
+		.decode(dec_mul),
+		.rd(mul_rd),
+		.rs(mul_rs),
+		.rm(mul_rm),
+		.update_flags(mul_update_flags),
+		.*
+	);
+
+	logic coproc_writeback, coproc_update_flags;
+	reg_num coproc_rd;
+
+	core_decode_coproc group_coproc
+	(
+		.rd(coproc_rd),
+		.decode(dec_coproc),
+		.writeback(coproc_writeback),
+		.update_flags(coproc_update_flags),
+		.*
+	);
+
+	logic mrs_spsr;
+	reg_num mrs_rd;
+
+	core_decode_mrs group_mrs
+	(
+		.rd(mrs_rd),
+		.spsr(mrs_spsr),
+		.*
+	);
+
+	logic msr_spsr, msr_is_imm;
+	msr_mask msr_fields;
+
+	core_decode_msr group_msr
+	(
+		.spsr(msr_spsr),
+		.fields(msr_fields),
+		.snd_is_imm(msr_is_imm),
+		.*
+	);
+
+endmodule