[PATCH] target/ppc: restore powerpc_excp_booke doorbell interrupts

[Nicholas Piggin]

This partially reverts commit 9dc20cc37db9 ("target/ppc: Simplify
powerpc_excp_booke"), which removed DOORI and DOORCI interrupts.
Without this patch, a -cpu e5500 -smp 2 machine booting Linux
crashes with:

  qemu: fatal: Invalid PowerPC exception 36. Aborting

Signed-off-by: Nicholas Piggin <npig...@gmail.com>
---
 target/ppc/excp_helper.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/target/ppc/excp_helper.c b/target/ppc/excp_helper.c
index 214acf5ac4..43f2480e94 100644
--- a/target/ppc/excp_helper.c
+++ b/target/ppc/excp_helper.c
@@ -1247,6 +1247,12 @@ static void powerpc_excp_booke(PowerPCCPU *cpu, int excp)
     case POWERPC_EXCP_SPEU:   /* SPE/embedded floating-point unavailable/VPU  
*/
         env->spr[SPR_BOOKE_ESR] = ESR_SPV;
         break;
+    case POWERPC_EXCP_DOORI:     /* Embedded doorbell interrupt              */
+        break;
+    case POWERPC_EXCP_DOORCI:    /* Embedded doorbell critical interrupt     */
+        srr0 = SPR_BOOKE_CSRR0;
+        srr1 = SPR_BOOKE_CSRR1;
+        break;
     case POWERPC_EXCP_RESET:     /* System reset exception                   */
         if (FIELD_EX64(env->msr, MSR, POW)) {
             cpu_abort(cs, "Trying to deliver power-saving system reset "
-- 
2.37.2