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Interrupt refactoring

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Olof Kindgren 2019-08-16 23:49:44 +02:00
parent 3c1582b7b2
commit d2cf7e547a
3 changed files with 14 additions and 14 deletions
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13
rtl/serv_csr.v
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@ -10,7 +10,7 @@ module serv_csr
output wire o_csr_in,
//Stuff
input wire i_mtip,
output wire o_timer_irq_en,
output reg o_new_irq,
input wire i_mstatus_en,
input wire i_mie_en,
input wire i_mcause_en,
@ -45,7 +45,7 @@ module serv_csr
assign o_q = csr_out;
assign o_timer_irq_en = mstatus_mie & mie_mtie;
wire timer_irq = i_mtip & mstatus_mie & mie_mtie;
assign mcause = (i_cnt[4:2] == 3'd0) ? mcause3_0[0] : //[3:0]
((i_cnt[4:2] == 3'd7) & i_cnt_r[3]) ? mcause31 //[31]
@ -53,6 +53,8 @@ module serv_csr
assign o_csr_in = csr_in;
reg mtip_r;
always @(posedge i_clk) begin
if (i_mstatus_en & (i_cnt[4:2] == 3'd0) & i_cnt_r[3])
mstatus_mie <= csr_in;
@ -62,9 +64,12 @@ module serv_csr
mstatus <= (i_cnt[4:2] == 0) & i_cnt_r[2] & mstatus_mie;
mtip_r <= i_mtip;
o_new_irq <= !mtip_r & timer_irq;
if (i_trap) begin
mcause31 <= i_mtip & o_timer_irq_en;
mcause3_0 <= (i_mtip & o_timer_irq_en) ? 4'd7 : i_mcause[3:0];
mcause31 <= timer_irq;
mcause3_0 <= timer_irq ? 4'd7 : i_mcause[3:0];
end
if (i_mcause_en) begin

8
rtl/serv_decode.v
View file

@ -3,8 +3,7 @@ module serv_decode
(
input wire clk,
input wire i_rst,
input wire i_mtip,
input wire i_timer_irq_en,
input wire i_new_irq,
input wire [31:0] i_wb_rdt,
input wire i_wb_en,
input wire i_rf_ready,
@ -291,7 +290,6 @@ module serv_decode
shift_op;
reg stage_one_done;
reg mtip_r;
reg pending_irq;
assign o_rf_rs_en = two_stage_op ? (state == INIT) : o_ctrl_pc_en;
@ -302,9 +300,7 @@ module serv_decode
if (state == IDLE)
o_ctrl_jump <= 1'b0;
mtip_r <= i_mtip;
if (i_mtip & !mtip_r & i_timer_irq_en)
if (i_new_irq)
pending_irq <= 1'b1;
cnt_done <= (o_cnt[4:2] == 3'b111) & o_cnt_r[2];

7
rtl/serv_top.v
View file

@ -123,14 +123,13 @@ module serv_top
wire lui;
wire timer_irq_en;
wire new_irq;
serv_decode decode
(
.clk (clk),
.i_rst (i_rst),
.i_mtip (i_timer_irq),
.i_timer_irq_en (timer_irq_en),
.i_new_irq (new_irq),
.i_wb_rdt (i_ibus_rdt),
.i_wb_en (o_ibus_cyc & i_ibus_ack),
.i_rf_ready (rf_ready | i_dbus_ack),
@ -339,7 +338,7 @@ module serv_top
.i_rf_csr_out (rf_csr_out),
.o_csr_in (csr_in),
.i_mtip (i_timer_irq),
.o_timer_irq_en ( timer_irq_en),
.o_new_irq (new_irq),
.i_mstatus_en (csr_mstatus_en),
.i_mie_en (csr_mie_en ),
.i_mcause_en (csr_mcause_en ),