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`include "core/uarch.sv"
module core_control_ldst
(
input logic clk,
rst_n,
input insn_decode dec,
input logic issue,
mem_ready,
input word rd_value_b,
q_alu,
q_shifter,
input ctrl_cycle cycle,
next_cycle,
input word alu_a,
alu_b,
output ptr mem_addr,
output logic[3:0] mem_data_be,
output word mem_data_wr,
mem_offset,
output logic mem_start,
mem_write,
pop_valid,
ldst,
ldst_next,
ldst_writeback,
output logic[1:0] ldst_shift,
output word ldst_read,
output reg_num popped
);
word base;
logic pre, increment, sign_extend;
reg_num popped_upper, popped_lower;
reg_list mem_regs, next_regs_upper, next_regs_lower;
ldst_size size;
assign popped = increment ? popped_lower : popped_upper;
assign ldst_next = !cycle.transfer || mem_ready;
assign mem_data_wr = q_shifter;
core_control_ldst_pop pop
(
.regs(mem_regs),
.valid(pop_valid),
.next_upper(next_regs_upper),
.next_lower(next_regs_lower),
.pop_upper(popped_upper),
.pop_lower(popped_lower)
);
core_control_ldst_sizes sizes
(
.addr(mem_addr),
.read(ldst_read),
.shift(ldst_shift),
.fault(), //TODO: alignment check
.byteenable(mem_data_be),
.*
);
always_ff @(posedge clk or negedge rst_n)
if(!rst_n) begin
pre <= 0;
ldst <= 0;
size <= LDST_WORD;
increment <= 0;
sign_extend <= 0;
ldst_writeback <= 0;
base <= {$bits(base){1'b0}};
mem_regs <= {$bits(mem_regs){1'b0}};
mem_write <= 0;
mem_start <= 0;
mem_offset <= 0;
end else begin
if(mem_start)
mem_start <= 0;
if(next_cycle.issue) begin
// TODO: dec.ldst.unprivileged
if(issue)
ldst <= dec.ctrl.ldst;
pre <= dec.ldst.pre_indexed;
size <= dec.ldst.size;
increment <= dec.ldst.increment;
sign_extend <= dec.ldst.sign_extend;
ldst_writeback <= dec.ldst.writeback;
mem_regs <= dec.ldst.regs;
mem_write <= !dec.ldst.load;
end else if(next_cycle.transfer) begin
if(!cycle.transfer) begin
ldst <= 0;
mem_offset <= alu_b;
end
if(ldst_next) begin
base <= pre ? q_alu : alu_a;
mem_regs <= increment ? next_regs_lower : next_regs_upper;
end
mem_start <= !cycle.transfer || (mem_ready && pop_valid);
end
end
endmodule
|
