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rocket-chip/rocket/src/main/scala/cpu.scala

126 lines
4.3 KiB
Scala
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package Top {
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import Chisel._;
import Node._;
import Constants._;
class ioDebug(view: List[String] = null) extends Bundle(view)
{
val error_mode = Bool(OUTPUT);
}
class ioHost(view: List[String] = null) extends Bundle(view)
{
val from_wen = Bool(INPUT);
val from = Bits(64, INPUT);
val to = Bits(64, OUTPUT);
}
class ioConsole(view: List[String] = null) extends Bundle(view)
{
val rdy = Bool(INPUT);
val valid = Bool(OUTPUT);
val bits = Bits(8, OUTPUT);
}
class ioRocket extends Bundle()
{
val debug = new ioDebug();
val console = new ioConsole();
val host = new ioHost();
val imem = new ioImem().flip();
val dmem = new ioDmem().flip();
}
class rocketProc extends Component
{
val io = new ioRocket();
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val ctrl = new rocketCtrl();
val dpath = new rocketDpath();
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val dtlb = new rocketDTLB(DTLB_ENTRIES);
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val itlb = new rocketITLB(ITLB_ENTRIES);
val ptw = new rocketPTW();
val arb = new rocketDmemArbiter();
ctrl.io.dpath <> dpath.io.ctrl;
dpath.io.host <> io.host;
dpath.io.debug <> io.debug;
// FIXME: try to make this more compact
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// connect ITLB to I$, ctrl, dpath
itlb.io.cpu.invalidate := dpath.io.ptbr_wen;
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itlb.io.cpu.status := dpath.io.ctrl.status;
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itlb.io.cpu.req_val := ctrl.io.imem.req_val;
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itlb.io.cpu.req_asid := Bits(0,ASID_BITS); // FIXME: connect to PCR
itlb.io.cpu.req_vpn := dpath.io.imem.req_addr(VADDR_BITS,PGIDX_BITS);
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io.imem.req_idx := dpath.io.imem.req_addr(PGIDX_BITS-1,0);
io.imem.req_ppn := itlb.io.cpu.resp_ppn;
io.imem.req_val := ctrl.io.imem.req_val;
io.imem.invalidate := ctrl.io.flush_inst;
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ctrl.io.imem.resp_val := io.imem.resp_val;
dpath.io.imem.resp_data := io.imem.resp_data;
ctrl.io.xcpt_itlb := itlb.io.cpu.exception;
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io.imem.itlb_miss := itlb.io.cpu.resp_miss;
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// connect DTLB to D$ arbiter, ctrl+dpath
dtlb.io.cpu.invalidate := dpath.io.ptbr_wen;
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dtlb.io.cpu.status := dpath.io.ctrl.status;
dtlb.io.cpu.req_val := ctrl.io.dtlb_val;
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dtlb.io.cpu.req_kill := ctrl.io.dtlb_kill;
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dtlb.io.cpu.req_cmd := ctrl.io.dmem.req_cmd;
dtlb.io.cpu.req_asid := Bits(0,ASID_BITS); // FIXME: connect to PCR
dtlb.io.cpu.req_vpn := dpath.io.dmem.req_addr(VADDR_BITS,PGIDX_BITS);
ctrl.io.xcpt_dtlb_ld := dtlb.io.cpu.xcpt_ld;
ctrl.io.xcpt_dtlb_st := dtlb.io.cpu.xcpt_st;
ctrl.io.dtlb_rdy := dtlb.io.cpu.req_rdy;
ctrl.io.dtlb_miss := dtlb.io.cpu.resp_miss;
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ctrl.io.xcpt_ma_ld := io.dmem.xcpt_ma_ld;
ctrl.io.xcpt_ma_st := io.dmem.xcpt_ma_st;
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// connect page table walker to TLBs, page table base register (from PCR)
// and D$ arbiter (selects between requests from pipeline and PTW, PTW has priority)
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ptw.io.dtlb <> dtlb.io.ptw;
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ptw.io.itlb <> itlb.io.ptw;
ptw.io.ptbr := dpath.io.ptbr;
arb.io.ptw <> ptw.io.dmem;
arb.io.mem <> io.dmem
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// connect arbiter to ctrl+dpath+DTLB
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arb.io.cpu.req_val := ctrl.io.dmem.req_val;
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arb.io.cpu.req_cmd := ctrl.io.dmem.req_cmd;
arb.io.cpu.req_type := ctrl.io.dmem.req_type;
arb.io.cpu.req_kill := ctrl.io.dmem.req_kill;
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arb.io.cpu.req_idx := dpath.io.dmem.req_addr(PGIDX_BITS-1,0);
arb.io.cpu.req_ppn := dtlb.io.cpu.resp_ppn;
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arb.io.cpu.req_data := dpath.io.dmem.req_data;
arb.io.cpu.req_tag := dpath.io.dmem.req_tag;
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ctrl.io.dmem.req_rdy := dtlb.io.cpu.req_rdy && arb.io.cpu.req_rdy;
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ctrl.io.dmem.resp_miss := arb.io.cpu.resp_miss;
ctrl.io.dmem.resp_replay:= arb.io.cpu.resp_replay;
ctrl.io.dmem.resp_nack := arb.io.cpu.resp_nack;
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dpath.io.dmem.resp_val := arb.io.cpu.resp_val;
dpath.io.dmem.resp_miss := arb.io.cpu.resp_miss;
dpath.io.dmem.resp_replay := arb.io.cpu.resp_replay;
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dpath.io.dmem.resp_tag := arb.io.cpu.resp_tag;
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dpath.io.dmem.resp_data := arb.io.cpu.resp_data;
dpath.io.dmem.resp_data_subword := io.dmem.resp_data_subword;
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io.console.bits := dpath.io.console.bits;
io.console.valid := dpath.io.console.valid;
ctrl.io.console.rdy := io.console.rdy;
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if (HAVE_FPU)
{
val fpu = new rocketFPU
fpu.io.dmem.resp_val := arb.io.cpu.resp_val;
fpu.io.dmem.resp_tag := arb.io.cpu.resp_tag;
fpu.io.dmem.resp_data := arb.io.cpu.resp_data;
dpath.io.fpu <> fpu.io.dpath
}
}
}