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`include "core/decode/isa.sv"
`include "core/uarch.sv"
module core_decode
(
input word insn,
input psr_flags flags,
output insn_decode dec
);
mul_decode mul_ctrl;
psr_decode psr_ctrl;
snd_decode snd_ctrl;
data_decode data_ctrl;
ldst_decode ldst_ctrl;
branch_decode branch_ctrl;
coproc_decode coproc_ctrl;
datapath_decode ctrl;
assign dec.mul = mul_ctrl;
assign dec.psr = psr_ctrl;
assign dec.snd = snd_ctrl;
assign dec.ctrl = ctrl;
assign dec.data = data_ctrl;
assign dec.ldst = ldst_ctrl;
assign dec.branch = branch_ctrl;
assign dec.coproc = coproc_ctrl;
assign ctrl.execute = execute;
assign ctrl.undefined = undefined;
assign ctrl.conditional = conditional;
assign ctrl.writeback = writeback;
assign ctrl.branch = branch;
assign ctrl.coproc = coproc;
assign ctrl.ldst = ldst;
assign ctrl.mul = mul;
assign psr_ctrl.saved = spsr;
assign psr_ctrl.write = psr_write;
assign psr_ctrl.update_flags = update_flags;
logic execute, undefined, conditional, writeback, update_flags,
branch, ldst, mul, coproc, spsr, psr_write;
core_decode_mux mux
(
.*
);
//TODO
logic restore_spsr;
logic cond_undefined, cond_execute, explicit_cond;
core_decode_conds conds
(
.cond(insn `FIELD_COND),
.execute(cond_execute),
.undefined(cond_undefined),
.conditional(explicit_cond),
.*
);
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(branch_ctrl.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_reg;
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_reg(ldst_misc_off_is_reg),
.*
);
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),
.*
);
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(mul_ctrl),
.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(coproc_ctrl),
.writeback(coproc_writeback),
.update_flags(coproc_update_flags),
.*
);
//TODO
logic mrs_spsr;
reg_num mrs_rd;
core_decode_mrs group_mrs
(
.rd(mrs_rd),
.spsr(mrs_spsr),
.*
);
//TODO
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
|
