[RFC PATCH v2 14/29] target/ppc: create an interrupt delivery method for POWER8

[Matheus Ferst]

The new method is identical to ppc_deliver_interrupt, processor-specific
code will be added/removed in the following patches. No functional
change intended.

Signed-off-by: Matheus Ferst <matheus.ferst@eldorado.org.br>
---
 target/ppc/excp_helper.c | 113 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 113 insertions(+)

diff --git a/target/ppc/excp_helper.c b/target/ppc/excp_helper.c
index 6ab03b2e12..0405fc8eee 100644
--- a/target/ppc/excp_helper.c
+++ b/target/ppc/excp_helper.c
@@ -1973,6 +1973,116 @@ static int ppc_next_unmasked_interrupt(CPUPPCState *env)
 }
 
 #if defined(TARGET_PPC64)
+static void p8_deliver_interrupt(CPUPPCState *env, int interrupt)
+{
+    PowerPCCPU *cpu = env_archcpu(env);
+    CPUState *cs = env_cpu(env);
+
+    switch (interrupt) {
+    case PPC_INTERRUPT_RESET: /* External reset */
+        env->pending_interrupts &= ~PPC_INTERRUPT_RESET;
+        powerpc_excp(cpu, POWERPC_EXCP_RESET);
+        break;
+    case PPC_INTERRUPT_MCK: /* Machine check exception */
+        env->pending_interrupts &= ~PPC_INTERRUPT_MCK;
+        powerpc_excp(cpu, POWERPC_EXCP_MCHECK);
+        break;
+#if 0 /* TODO */
+    case PPC_INTERRUPT_DEBUG: /* External debug exception */
+        env->pending_interrupts &= ~PPC_INTERRUPT_DEBUG;
+        powerpc_excp(cpu, POWERPC_EXCP_DEBUG);
+        break;
+#endif
+
+    case PPC_INTERRUPT_HDECR: /* Hypervisor decrementer exception */
+        /* HDEC clears on delivery */
+        env->pending_interrupts &= ~PPC_INTERRUPT_HDECR;
+        powerpc_excp(cpu, POWERPC_EXCP_HDECR);
+        break;
+    case PPC_INTERRUPT_HVIRT: /* Hypervisor virtualization interrupt */
+        powerpc_excp(cpu, POWERPC_EXCP_HVIRT);
+        break;
+
+    case PPC_INTERRUPT_EXT:
+        if (books_vhyp_promotes_external_to_hvirt(cpu)) {
+            powerpc_excp(cpu, POWERPC_EXCP_HVIRT);
+        } else {
+            powerpc_excp(cpu, POWERPC_EXCP_EXTERNAL);
+        }
+        break;
+    case PPC_INTERRUPT_CEXT: /* External critical interrupt */
+        powerpc_excp(cpu, POWERPC_EXCP_CRITICAL);
+        break;
+
+    case PPC_INTERRUPT_WDT: /* Watchdog timer on embedded PowerPC */
+        env->pending_interrupts &= ~PPC_INTERRUPT_WDT;
+        powerpc_excp(cpu, POWERPC_EXCP_WDT);
+        break;
+    case PPC_INTERRUPT_CDOORBELL:
+        env->pending_interrupts &= ~PPC_INTERRUPT_CDOORBELL;
+        powerpc_excp(cpu, POWERPC_EXCP_DOORCI);
+        break;
+    case PPC_INTERRUPT_FIT: /* Fixed interval timer on embedded PowerPC */
+        env->pending_interrupts &= ~PPC_INTERRUPT_FIT;
+        powerpc_excp(cpu, POWERPC_EXCP_FIT);
+        break;
+    case PPC_INTERRUPT_PIT: /* Programmable interval timer on embedded PowerPC 
*/
+        env->pending_interrupts &= ~PPC_INTERRUPT_PIT;
+        powerpc_excp(cpu, POWERPC_EXCP_PIT);
+        break;
+    case PPC_INTERRUPT_DECR: /* Decrementer exception */
+        if (ppc_decr_clear_on_delivery(env)) {
+            env->pending_interrupts &= ~PPC_INTERRUPT_DECR;
+        }
+        powerpc_excp(cpu, POWERPC_EXCP_DECR);
+        break;
+    case PPC_INTERRUPT_DOORBELL:
+        env->pending_interrupts &= ~PPC_INTERRUPT_DOORBELL;
+        if (is_book3s_arch2x(env)) {
+            powerpc_excp(cpu, POWERPC_EXCP_SDOOR);
+        } else {
+            powerpc_excp(cpu, POWERPC_EXCP_DOORI);
+        }
+        break;
+    case PPC_INTERRUPT_HDOORBELL:
+        env->pending_interrupts &= ~PPC_INTERRUPT_HDOORBELL;
+        powerpc_excp(cpu, POWERPC_EXCP_SDOOR_HV);
+        break;
+    case PPC_INTERRUPT_PERFM:
+        env->pending_interrupts &= ~PPC_INTERRUPT_PERFM;
+        powerpc_excp(cpu, POWERPC_EXCP_PERFM);
+        break;
+    case PPC_INTERRUPT_THERM:  /* Thermal interrupt */
+        env->pending_interrupts &= ~PPC_INTERRUPT_THERM;
+        powerpc_excp(cpu, POWERPC_EXCP_THERM);
+        break;
+    case PPC_INTERRUPT_EBB: /* EBB exception */
+        env->pending_interrupts &= ~PPC_INTERRUPT_EBB;
+        if (env->spr[SPR_BESCR] & BESCR_PMEO) {
+            powerpc_excp(cpu, POWERPC_EXCP_PERFM_EBB);
+        } else if (env->spr[SPR_BESCR] & BESCR_EEO) {
+            powerpc_excp(cpu, POWERPC_EXCP_EXTERNAL_EBB);
+        }
+        break;
+    case 0:
+        /*
+         * This is a bug ! It means that has_work took us out of halt without
+         * anything to deliver while in a PM state that requires getting
+         * out via a 0x100
+         *
+         * This means we will incorrectly execute past the power management
+         * instruction instead of triggering a reset.
+         *
+         * It generally means a discrepancy between the wakeup conditions in 
the
+         * processor has_work implementation and the logic in this function.
+         */
+        assert(env->resume_as_sreset != 0);
+        break;
+    default:
+        cpu_abort(cs, "Invalid PowerPC interrupt %d. Aborting\n", interrupt);
+    }
+}
+
 static void p9_deliver_interrupt(CPUPPCState *env, int interrupt)
 {
     PowerPCCPU *cpu = env_archcpu(env);
@@ -2167,6 +2277,9 @@ static void ppc_deliver_interrupt(CPUPPCState *env, int 
interrupt)
 {
     switch (env->excp_model) {
 #if defined(TARGET_PPC64)
+    case POWERPC_EXCP_POWER8:
+        p8_deliver_interrupt(env, interrupt);
+        break;
     case POWERPC_EXCP_POWER9:
     case POWERPC_EXCP_POWER10:
         p9_deliver_interrupt(env, interrupt);
-- 
2.25.1