Subject: [PATCH 8/8] powerpc/pseries: remove unused exception code, small cleanups

From: Nicholas Piggin <[email-masked]>
Date: Tue, 13 Sep 2016 13:08:46 +1000

This was not done before the big patches because I only noticed
them afterwards. It has become much easier to see which handlers
are branched to from which exception vectors now, and to see
exactly what vector space is being used for what.

Signed-off-by: Nicholas Piggin <[email-masked]>
---
 arch/powerpc/kernel/exceptions-64s.S | 26 ++++++++++++++++----------
 1 file changed, 16 insertions(+), 10 deletions(-)

diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index a647779..4d06af3 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -89,6 +89,9 @@ USE_FIXED_SECTION(real_vectors)
 	.globl __start_interrupts
 __start_interrupts:
 
+/* No virt vectors corresponding with 0x0..0x100 */
+VECTOR_HANDLER_VIRT_NONE(0x4000, 0x4100)
+
 VECTOR_HANDLER_REAL_BEGIN(system_reset, 0x100, 0x200)
 	SET_SCRATCH0(r13)
 #ifdef CONFIG_PPC_P7_NAP
@@ -902,9 +905,7 @@ TRAMP_KVM(PACA_EXGEN, 0xd00)
 COMMON_HANDLER(single_step_common, 0xd00, single_step_exception)
 
 VECTOR_HANDLER_REAL_OOL_HV(h_data_storage, 0xe00, 0xe20)
-VECTOR_HANDLER_VIRT_BEGIN(unused, 0x4e00, 0x4e20)
-	b       .       /* Can't happen, see v2.07 Book III-S section 6.5 */
-VECTOR_HANDLER_VIRT_END(unused, 0x4e00, 0x4e20)
+VECTOR_HANDLER_VIRT_NONE(0x4e00, 0x4e20)
 TRAMP_KVM_HV_SKIP(PACA_EXGEN, 0xe00)
 COMMON_HANDLER_BEGIN(h_data_storage_common)
 	mfspr   r10,SPRN_HDAR
@@ -918,13 +919,10 @@ COMMON_HANDLER_BEGIN(h_data_storage_common)
 	bl      unknown_exception
 	b       ret_from_except
 COMMON_HANDLER_END(h_data_storage_common)
-COMMON_HANDLER(trap_0e_common, 0xe00, unknown_exception)

 VECTOR_HANDLER_REAL_OOL_HV(h_instr_storage, 0xe20, 0xe40)
-VECTOR_HANDLER_VIRT_BEGIN(unused, 0x4e20, 0x4e40)
-	b       .       /* Can't happen, see v2.07 Book III-S section 6.5 */
-VECTOR_HANDLER_VIRT_END(unused, 0x4e20, 0x4e40)
+VECTOR_HANDLER_VIRT_NONE(0x4e20, 0x4e40)
 TRAMP_KVM_HV(PACA_EXGEN, 0xe20)
 COMMON_HANDLER(h_instr_storage_common, 0xe20, unknown_exception)
 
@@ -935,11 +933,14 @@ TRAMP_KVM_HV(PACA_EXGEN, 0xe40)
 COMMON_HANDLER(emulation_assist_common, 0xe40, emulation_assist_interrupt)

+/*
+ * hmi_exception trampoline is a special case. It jumps to hmi_exception_early
+ * first, and then eventaully from there to the trampoline to get into virtual
+ * mode.
+ */
 __VECTOR_HANDLER_REAL_OOL_HV_DIRECT(hmi_exception, 0xe60, 0xe80, hmi_exception_early)
 __TRAMP_HANDLER_REAL_OOL_MASKABLE_HV(hmi_exception, 0xe60)
-VECTOR_HANDLER_VIRT_BEGIN(unused, 0x4e60, 0x4e80)
-	b       .       /* Can't happen, see v2.07 Book III-S section 6.5 */
-VECTOR_HANDLER_VIRT_END(unused, 0x4e60, 0x4e80)
+VECTOR_HANDLER_VIRT_NONE(0x4e60, 0x4e80)
 TRAMP_KVM_HV(PACA_EXGEN, 0xe60)
 COMMON_HANDLER_BEGIN(hmi_exception_early)
 	EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_HV, 0xe60)
@@ -1117,6 +1118,7 @@ TRAMP_KVM_HV_SKIP(PACA_EXGEN, 0x1200)
 COMMON_HANDLER(cbe_system_error_common, 0x1200, cbe_system_error_exception)
 #else /* CONFIG_CBE_RAS */
 VECTOR_HANDLER_REAL_NONE(0x1200, 0x1300)
+VECTOR_HANDLER_VIRT_NONE(0x5200, 0x5300)
 #endif

@@ -1231,6 +1233,7 @@ COMMON_HANDLER(cbe_maintenance_common, 0x1600, cbe_maintenance_exception)
 
 #else /* CONFIG_CBE_RAS */
 VECTOR_HANDLER_REAL_NONE(0x1600, 0x1700)
+VECTOR_HANDLER_VIRT_NONE(0x5600, 0x5700)
 #endif

@@ -1252,8 +1255,11 @@ COMMON_HANDLER(cbe_thermal_common, 0x1800, cbe_thermal_exception)
 
 #else /* CONFIG_CBE_RAS */
 VECTOR_HANDLER_REAL_NONE(0x1800, 0x1900)
+VECTOR_HANDLER_VIRT_NONE(0x5800, 0x5900)
 #endif
 
+/* Real vector area ends at 0x18ff */
+VECTOR_HANDLER_VIRT_NONE(0x5900, 0x6000)
 
 /*
  * An interrupt came in while soft-disabled. We set paca->irq_happened, then:
-- 
2.9.3