Smstateen: Implement *stateen0[59] controlling RV32-only CSRs (v)siph…

…, (v)sieh, hidelegh, and hviph
riscv-software-src · Aug 2, 2024 · 4d594ea · 4d594ea
1 parent 38b8e12
commit 4d594ea
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Showing 3 changed files with 28 additions and 6 deletions.
diff --git a/riscv/csrs.cc b/riscv/csrs.cc
@@ -592,6 +592,22 @@ reg_t rv32_high_csr_t::written_value() const noexcept {
   return (orig->written_value() >> 32) & 0xffffffffU;
 }
 
+aia_rv32_high_csr_t::aia_rv32_high_csr_t(processor_t* const proc, const reg_t addr, csr_t_p orig):
+  rv32_high_csr_t(proc, addr, orig) {
+}
+
+void aia_rv32_high_csr_t::verify_permissions(insn_t insn, bool write) const {
+  if (proc->extension_enabled(EXT_SMSTATEEN)) {
+    if ((state->prv < PRV_M) && !(state->mstateen[0]->read() & MSTATEEN0_AIA))
+      throw trap_illegal_instruction(insn.bits());
+
+    if (state->v && !(state->hstateen[0]->read() & HSTATEEN0_AIA))
+      throw trap_virtual_instruction(insn.bits());
+  }
+
+  aia_rv32_high_csr_t::verify_permissions(insn, write);
+}
+
 // implement class sstatus_csr_t
 sstatus_csr_t::sstatus_csr_t(processor_t* const proc, sstatus_proxy_csr_t_p orig, vsstatus_csr_t_p virt):
   virtualized_csr_t(proc, orig, virt),

diff --git a/riscv/csrs.h b/riscv/csrs.h
@@ -300,6 +300,12 @@ class rv32_high_csr_t: public csr_t {
   csr_t_p orig;
 };
 
+class aia_rv32_high_csr_t: public rv32_high_csr_t {
+ public:
+  aia_rv32_high_csr_t(processor_t* const proc, const reg_t addr, csr_t_p orig);
+  virtual void verify_permissions(insn_t insn, bool write) const override;
+};
+
 class sstatus_proxy_csr_t final: public base_status_csr_t {
  public:
   sstatus_proxy_csr_t(processor_t* const proc, const reg_t addr, mstatus_csr_t_p mstatus);

diff --git a/riscv/processor.cc b/riscv/processor.cc
@@ -353,9 +353,9 @@ void state_t::reset(processor_t* const proc, reg_t max_isa)
   auto sip = std::make_shared<virtualized_stimecmp_csr_t>(proc, nonvirtual_sip, vsip);
   if (xlen == 32 && proc->extension_enabled_const(EXT_SSAIA)) {
     csrmap[CSR_VSIP] = std::make_shared<rv32_low_csr_t>(proc, CSR_VSIP, vsip);
-    csrmap[CSR_VSIPH] = std::make_shared<rv32_high_csr_t>(proc, CSR_VSIPH, vsip);
+    csrmap[CSR_VSIPH] = std::make_shared<aia_rv32_high_csr_t>(proc, CSR_VSIPH, vsip);
     csrmap[CSR_SIP] = std::make_shared<rv32_low_csr_t>(proc, CSR_SIP, sip);
-    csrmap[CSR_SIPH] = std::make_shared<rv32_high_csr_t>(proc, CSR_SIPH, sip);
+    csrmap[CSR_SIPH] = std::make_shared<aia_rv32_high_csr_t>(proc, CSR_SIPH, sip);
   } else {
     csrmap[CSR_VSIP] = vsip;
     csrmap[CSR_SIP] = sip;
@@ -364,7 +364,7 @@ void state_t::reset(processor_t* const proc, reg_t max_isa)
   hvip = std::make_shared<hvip_csr_t>(proc, CSR_HVIP, 0);
   if (xlen == 32 && proc->extension_enabled_const(EXT_SSAIA)) {
     csrmap[CSR_HVIP] = std::make_shared<rv32_low_csr_t>(proc, CSR_HVIP, hvip);
-    csrmap[CSR_HVIPH] = std::make_shared<rv32_high_csr_t>(proc, CSR_HVIPH, hvip);
+    csrmap[CSR_HVIPH] = std::make_shared<aia_rv32_high_csr_t>(proc, CSR_HVIPH, hvip);
   } else {
     csrmap[CSR_HVIP] = hvip;
   }
@@ -374,9 +374,9 @@ void state_t::reset(processor_t* const proc, reg_t max_isa)
   auto sie = std::make_shared<virtualized_stimecmp_csr_t>(proc, nonvirtual_sie, vsie);
   if (xlen == 32 && proc->extension_enabled_const(EXT_SSAIA)) {
     csrmap[CSR_VSIE] = std::make_shared<rv32_low_csr_t>(proc, CSR_VSIE, vsie);
-    csrmap[CSR_VSIEH] = std::make_shared<rv32_high_csr_t>(proc, CSR_VSIEH, vsie);
+    csrmap[CSR_VSIEH] = std::make_shared<aia_rv32_high_csr_t>(proc, CSR_VSIEH, vsie);
     csrmap[CSR_SIE] = std::make_shared<rv32_low_csr_t>(proc, CSR_SIE, sie);
-    csrmap[CSR_SIEH] = std::make_shared<rv32_high_csr_t>(proc, CSR_SIEH, sie);
+    csrmap[CSR_SIEH] = std::make_shared<aia_rv32_high_csr_t>(proc, CSR_SIEH, sie);
   } else {
     csrmap[CSR_VSIE] = vsie;
     csrmap[CSR_SIE] = sie;
@@ -427,7 +427,7 @@ void state_t::reset(processor_t* const proc, reg_t max_isa)
   hideleg = std::make_shared<hideleg_csr_t>(proc, CSR_HIDELEG, mideleg);
   if (xlen == 32 && proc->extension_enabled_const(EXT_SSAIA)) {
     csrmap[CSR_HIDELEG] = std::make_shared<rv32_low_csr_t>(proc, CSR_HIDELEG, hideleg);
-    csrmap[CSR_HIDELEGH] = std::make_shared<rv32_high_csr_t>(proc, CSR_HIDELEGH, hideleg);
+    csrmap[CSR_HIDELEGH] = std::make_shared<aia_rv32_high_csr_t>(proc, CSR_HIDELEGH, hideleg);
   } else {
     csrmap[CSR_HIDELEG] = hideleg;
   }