hw/mips/itu: Pass SAAR using QOM link property

QOM objects shouldn't access each other internals fields
except using the QOM API.

mips_cps_realize() instantiates a TYPE_MIPS_ITU object, and
directly sets the 'saar' pointer:

   if (saar_present) {
       s->itu.saar = &env->CP0_SAAR;
   }

In order to avoid that, pass the MIPS_CPU object via a QOM
link property, and set the 'saar' pointer in mips_itu_realize().

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Tested-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Message-Id: <20230203113650.78146-10-philmd@linaro.org>

1 files changed, 18 insertions, 8 deletions

diff --git a/hw/misc/mips_itu.c b/hw/misc/mips_itu.c
index a06cdd1..0eda302 100644
--- a/hw/misc/mips_itu.c
+++ b/hw/misc/mips_itu.c
@@ -93,10 +93,10 @@ void itc_reconfigure(MIPSITUState *tag)
     uint64_t size = (1 * KiB) + (am[1] & ITC_AM1_ADDR_MASK_MASK);
     bool is_enabled = (am[0] & ITC_AM0_EN_MASK) != 0;
 
-    if (tag->saar_present) {
-        address = ((*(uint64_t *) tag->saar) & 0xFFFFFFFFE000ULL) << 4;
-        size = 1ULL << ((*(uint64_t *) tag->saar >> 1) & 0x1f);
-        is_enabled = *(uint64_t *) tag->saar & 1;
+    if (tag->saar) {
+        address = (tag->saar[0] & 0xFFFFFFFFE000ULL) << 4;
+        size = 1ULL << ((tag->saar[0] >> 1) & 0x1f);
+        is_enabled = tag->saar[0] & 1;
     }
 
     memory_region_transaction_begin();
@@ -157,7 +157,7 @@ static inline ITCView get_itc_view(hwaddr addr)
 static inline int get_cell_stride_shift(const MIPSITUState *s)
 {
     /* Minimum interval (for EntryGain = 0) is 128 B */
-    if (s->saar_present) {
+    if (s->saar) {
         return 7 + ((s->icr0 >> ITC_ICR0_BLK_GRAIN) &
                     ITC_ICR0_BLK_GRAIN_MASK);
     } else {
@@ -515,6 +515,7 @@ static void mips_itu_init(Object *obj)
 static void mips_itu_realize(DeviceState *dev, Error **errp)
 {
     MIPSITUState *s = MIPS_ITU(dev);
+    CPUMIPSState *env;
 
     if (s->num_fifo > ITC_FIFO_NUM_MAX) {
         error_setg(errp, "Exceed maximum number of FIFO cells: %d",
@@ -526,6 +527,15 @@ static void mips_itu_realize(DeviceState *dev, Error **errp)
                    s->num_semaphores);
         return;
     }
+    if (!s->cpu0) {
+        error_setg(errp, "Missing 'cpu[0]' property");
+        return;
+    }
+
+    env = &s->cpu0->env;
+    if (env->saarp) {
+        s->saar = env->CP0_SAAR;
+    }
 
     s->cell = g_new(ITCStorageCell, get_num_cells(s));
 }
@@ -534,8 +544,8 @@ static void mips_itu_reset(DeviceState *dev)
 {
     MIPSITUState *s = MIPS_ITU(dev);
 
-    if (s->saar_present) {
-        *(uint64_t *) s->saar = 0x11 << 1;
+    if (s->saar) {
+        s->saar[0] = 0x11 << 1;
         s->icr0 = get_num_cells(s) << ITC_ICR0_CELL_NUM;
     } else {
         s->ITCAddressMap[0] = 0;
@@ -553,7 +563,7 @@ static Property mips_itu_properties[] = {
                       ITC_FIFO_NUM_MAX),
     DEFINE_PROP_UINT32("num-semaphores", MIPSITUState, num_semaphores,
                       ITC_SEMAPH_NUM_MAX),
-    DEFINE_PROP_BOOL("saar-present", MIPSITUState, saar_present, false),
+    DEFINE_PROP_LINK("cpu[0]", MIPSITUState, cpu0, TYPE_MIPS_CPU, MIPSCPU *),
     DEFINE_PROP_END_OF_LIST(),
 };