riscv/rocket-chip
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Ignore LSB of PC

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This commit is contained in:
Andrew Waterman
2013-09-12 17:55:58 -07:00
parent 59f5358435
commit 1edb1e2a0a
1 changed files with 4 additions and 3 deletions
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7
rocket/src/main/scala/icache.scala
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@@ -59,7 +59,8 @@ class Frontend(implicit c: ICacheConfig, tl: TileLinkConfiguration) extends Modu
val icache = Module(new ICache)
val tlb = Module(new TLB(c.ntlb))
val s1_pc = Reg(UInt())
val s1_pc_ = Reg(UInt())
val s1_pc = s1_pc_ & SInt(-2) // discard LSB of PC (throughout the pipeline)
val s1_same_block = Reg(Bool())
val s2_valid = Reg(init=Bool(true))
val s2_pc = Reg(init=UInt(START_ADDR))
@@ -77,7 +78,7 @@ class Frontend(implicit c: ICacheConfig, tl: TileLinkConfiguration) extends Modu
val stall = io.cpu.resp.valid && !io.cpu.resp.ready
when (!stall) {
s1_same_block := s0_same_block && !tlb.io.resp.miss
s1_pc := npc
s1_pc_ := npc
s2_valid := !icmiss
when (!icmiss) {
s2_pc := s1_pc
@@ -87,7 +88,7 @@ class Frontend(implicit c: ICacheConfig, tl: TileLinkConfiguration) extends Modu
}
when (io.cpu.req.valid) {
s1_same_block := Bool(false)
s1_pc := io.cpu.req.bits.pc
s1_pc_ := io.cpu.req.bits.pc
s2_valid := Bool(false)
}