[Qemu-devel] [PATCH 1/9] exec: Map device_endian onto MemOp

[Tony Nguyen <tony.nguyen@bt.com>]

Preparation to replace device_endian with MemOp.

Mapping device_endian onto MemOp limits behaviour changes to this
relatively smaller patch.

The next patch will replace all device_endian usages with the
equivalent MemOp. That patch will be large but have no behaviour
changes.

A subsequent patch will then delete unused device_endian.

Signed-off-by: Tony Nguyen <tony.nguyen@bt.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
---
 hw/char/serial.c          | 18 ++++++------------
 include/exec/cpu-common.h | 10 +++++++---
 memory.c                  |  1 -
 3 files changed, 13 insertions(+), 16 deletions(-)

diff --git a/hw/char/serial.c b/hw/char/serial.c
index b4aa250950..6328476f52 100644
--- a/hw/char/serial.c
+++ b/hw/char/serial.c
@@ -1016,22 +1016,15 @@ static void serial_mm_write(void *opaque, hwaddr addr,
     serial_ioport_write(s, addr >> s->it_shift, value, 1);
 }
 
-static const MemoryRegionOps serial_mm_ops[3] = {
-    [DEVICE_NATIVE_ENDIAN] = {
-        .read = serial_mm_read,
-        .write = serial_mm_write,
-        .endianness = DEVICE_NATIVE_ENDIAN,
-        .valid.max_access_size = 8,
-        .impl.max_access_size = 8,
-    },
-    [DEVICE_LITTLE_ENDIAN] = {
+static const MemoryRegionOps serial_mm_ops[2] = {
+    [0] = {
         .read = serial_mm_read,
         .write = serial_mm_write,
         .endianness = DEVICE_LITTLE_ENDIAN,
         .valid.max_access_size = 8,
         .impl.max_access_size = 8,
     },
-    [DEVICE_BIG_ENDIAN] = {
+    [1] = {
         .read = serial_mm_read,
         .write = serial_mm_write,
         .endianness = DEVICE_BIG_ENDIAN,
@@ -1057,8 +1050,9 @@ SerialState *serial_mm_init(MemoryRegion *address_space,
     serial_realize_core(s, &error_fatal);
     vmstate_register(NULL, base, &vmstate_serial, s);
 
-    memory_region_init_io(&s->io, NULL, &serial_mm_ops[end], s,
-                          "serial", 8 << it_shift);
+    memory_region_init_io(&s->io, NULL,
+                          &serial_mm_ops[end == DEVICE_BIG_ENDIAN],
+                          s, "serial", 8 << it_shift);
     memory_region_add_subregion(address_space, base, &s->io);
     return s;
 }
diff --git a/include/exec/cpu-common.h b/include/exec/cpu-common.h
index f7dbe75fbc..c388453ed7 100644
--- a/include/exec/cpu-common.h
+++ b/include/exec/cpu-common.h
@@ -16,10 +16,14 @@ void tcg_flush_softmmu_tlb(CPUState *cs);
 
 #if !defined(CONFIG_USER_ONLY)
 
+#include "exec/memop.h"
+
 enum device_endian {
-    DEVICE_NATIVE_ENDIAN,
-    DEVICE_BIG_ENDIAN,
-    DEVICE_LITTLE_ENDIAN,
+#ifdef NEED_CPU_H
+    DEVICE_NATIVE_ENDIAN = MO_TE,
+#endif
+    DEVICE_BIG_ENDIAN = MO_BE,
+    DEVICE_LITTLE_ENDIAN = MO_LE,
 };
 
 #if defined(HOST_WORDS_BIGENDIAN)
diff --git a/memory.c b/memory.c
index 11a9b08060..f30ce520c9 100644
--- a/memory.c
+++ b/memory.c
@@ -3283,7 +3283,6 @@ MemOp devend_memop(enum device_endian end)
     switch (end) {
     case DEVICE_LITTLE_ENDIAN:
     case DEVICE_BIG_ENDIAN:
-    case DEVICE_NATIVE_ENDIAN:
         return conv[end];
     default:
         g_assert_not_reached();
-- 
2.23.0