Remove MIPI; mip.MSIP bit is read-only

riscv/encoding.h

@@ -661,7 +661,6 @@
 #define CSR_MCAUSE 0x342
 #define CSR_MBADADDR 0x343
 #define CSR_MIP 0x344
-#define CSR_MIPI 0x345
 #define CSR_MUCOUNTEREN 0x310
 #define CSR_MSCOUNTEREN 0x311
 #define CSR_MUCYCLE_DELTA 0x700
@@ -678,8 +677,6 @@
 #define CSR_MARCHID 0xf12
 #define CSR_MIMPID 0xf13
 #define CSR_MHARTID 0xf14
-#define CSR_MTOHOST 0x7c0
-#define CSR_MFROMHOST 0x7c1
 #define CSR_MRESET 0x7c2
 #define CSR_CYCLEH 0xc80
 #define CSR_TIMEH 0xc81
@@ -966,7 +963,6 @@ DECLARE_CSR(mepc, CSR_MEPC)
 DECLARE_CSR(mcause, CSR_MCAUSE)
 DECLARE_CSR(mbadaddr, CSR_MBADADDR)
 DECLARE_CSR(mip, CSR_MIP)
-DECLARE_CSR(mipi, CSR_MIPI)
 DECLARE_CSR(mucounteren, CSR_MUCOUNTEREN)
 DECLARE_CSR(mscounteren, CSR_MSCOUNTEREN)
 DECLARE_CSR(mucycle_delta, CSR_MUCYCLE_DELTA)
@@ -983,8 +979,6 @@ DECLARE_CSR(mvendorid, CSR_MVENDORID)
 DECLARE_CSR(marchid, CSR_MARCHID)
 DECLARE_CSR(mimpid, CSR_MIMPID)
 DECLARE_CSR(mhartid, CSR_MHARTID)
-DECLARE_CSR(mtohost, CSR_MTOHOST)
-DECLARE_CSR(mfromhost, CSR_MFROMHOST)
 DECLARE_CSR(mreset, CSR_MRESET)
 DECLARE_CSR(cycleh, CSR_CYCLEH)
 DECLARE_CSR(timeh, CSR_TIMEH)

riscv/processor.cc

@@ -254,7 +254,7 @@ static bool validate_vm(int max_xlen, reg_t vm)
 void processor_t::set_csr(int which, reg_t val)
 {
   val = zext_xlen(val);
-  reg_t delegable_ints = MIP_SSIP | MIP_STIP | (1 << IRQ_HOST) | (1 << IRQ_COP);
+  reg_t delegable_ints = MIP_SSIP | MIP_STIP | (1 << IRQ_COP);
   reg_t all_ints = delegable_ints | MIP_MSIP | MIP_MTIP;
   switch (which)
   {
@@ -300,13 +300,10 @@ void processor_t::set_csr(int which, reg_t val)
       break;
     }
     case CSR_MIP: {
-      reg_t mask = MIP_SSIP | MIP_STIP | MIP_MSIP;
+      reg_t mask = MIP_SSIP | MIP_STIP;
       state.mip = (state.mip & ~mask) | (val & mask);
       break;
     }
-    case CSR_MIPI:
-      state.mip = set_field(state.mip, MIP_MSIP, val & 1);
-      break;
     case CSR_MIE:
       state.mie = (state.mie & ~all_ints) | (val & all_ints);
       break;
@@ -424,7 +421,6 @@ reg_t processor_t::get_csr(int which)
     case CSR_SSCRATCH: return state.sscratch;
     case CSR_MSTATUS: return state.mstatus;
     case CSR_MIP: return state.mip;
-    case CSR_MIPI: return 0;
     case CSR_MIE: return state.mie;
     case CSR_MEPC: return state.mepc;
     case CSR_MSCRATCH: return state.mscratch;