[RFC PATCH v2 06/29] target/ppc: remove unused interrupts from p9_pending_interrupt

[Matheus Ferst]

Remove the following unused interrupts from the POWER9 interrupt masking
method:
- PPC_INTERRUPT_RESET: only raised for 6xx, 7xx, 970, and POWER5p;
- Debug Interrupt: removed in Power ISA v2.07;
- Critical Input, Watchdog Timer, and Fixed Interval Timer: only defined
  for embedded CPUs;
- Critical Doorbell Interrupt: removed in Power ISA v3.0;
- Programmable Interval Timer: 40x-only.

Signed-off-by: Matheus Ferst <matheus.ferst@eldorado.org.br>
---
v2:
  - Remove CDOORBELL and THERM (farosas);
  - Also remove RESET and DEBUG, interrupts;
  - Assert for the removed interrupts.
---
 target/ppc/excp_helper.c | 42 +++++++---------------------------------
 1 file changed, 7 insertions(+), 35 deletions(-)

diff --git a/target/ppc/excp_helper.c b/target/ppc/excp_helper.c
index f2b0845735..af2cab01a7 100644
--- a/target/ppc/excp_helper.c
+++ b/target/ppc/excp_helper.c
@@ -1679,24 +1679,21 @@ void ppc_cpu_do_interrupt(CPUState *cs)
 }
 
 #if defined(TARGET_PPC64)
+#define P9_UNUSED_INTERRUPTS \
+    (PPC_INTERRUPT_RESET | PPC_INTERRUPT_DEBUG | PPC_INTERRUPT_CEXT |   \
+     PPC_INTERRUPT_WDT | PPC_INTERRUPT_CDOORBELL | PPC_INTERRUPT_FIT |  \
+     PPC_INTERRUPT_PIT | PPC_INTERRUPT_THERM)
+
 static int p9_next_unmasked_interrupt(CPUPPCState *env)
 {
     bool async_deliver;
 
-    /* External reset */
-    if (env->pending_interrupts & PPC_INTERRUPT_RESET) {
-        return PPC_INTERRUPT_RESET;
-    }
+    assert((env->pending_interrupts & P9_UNUSED_INTERRUPTS) == 0);
+
     /* Machine check exception */
     if (env->pending_interrupts & PPC_INTERRUPT_MCK) {
         return PPC_INTERRUPT_MCK;
     }
-#if 0 /* TODO */
-    /* External debug exception */
-    if (env->pending_interrupts & PPC_INTERRUPT_DEBUG) {
-        return PPC_INTERRUPT_DEBUG;
-    }
-#endif
 
     /*
      * For interrupts that gate on MSR:EE, we need to do something a
@@ -1736,28 +1733,7 @@ static int p9_next_unmasked_interrupt(CPUPPCState *env)
             return PPC_INTERRUPT_EXT;
         }
     }
-    if (FIELD_EX64(env->msr, MSR, CE)) {
-        /* External critical interrupt */
-        if (env->pending_interrupts & PPC_INTERRUPT_CEXT) {
-            return PPC_INTERRUPT_CEXT;
-        }
-    }
     if (async_deliver != 0) {
-        /* Watchdog timer on embedded PowerPC */
-        if (env->pending_interrupts & PPC_INTERRUPT_WDT) {
-            return PPC_INTERRUPT_WDT;
-        }
-        if (env->pending_interrupts & PPC_INTERRUPT_CDOORBELL) {
-            return PPC_INTERRUPT_CDOORBELL;
-        }
-        /* Fixed interval timer on embedded PowerPC */
-        if (env->pending_interrupts & PPC_INTERRUPT_FIT) {
-            return PPC_INTERRUPT_FIT;
-        }
-        /* Programmable interval timer on embedded PowerPC */
-        if (env->pending_interrupts & PPC_INTERRUPT_PIT) {
-            return PPC_INTERRUPT_PIT;
-        }
         /* Decrementer exception */
         if (env->pending_interrupts & PPC_INTERRUPT_DECR) {
             return PPC_INTERRUPT_DECR;
@@ -1771,10 +1747,6 @@ static int p9_next_unmasked_interrupt(CPUPPCState *env)
         if (env->pending_interrupts & PPC_INTERRUPT_PERFM) {
             return PPC_INTERRUPT_PERFM;
         }
-        /* Thermal interrupt */
-        if (env->pending_interrupts & PPC_INTERRUPT_THERM) {
-            return PPC_INTERRUPT_THERM;
-        }
         /* EBB exception */
         if (env->pending_interrupts & PPC_INTERRUPT_EBB) {
             /*
-- 
2.25.1