Mark the MemoryRegionCache structure const when it is only
accessed read-only.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 include/system/memory_cached.h          | 18 +++++++++---------
 include/system/memory_ldst_cached.h.inc | 15 +++++++++------
 system/physmem.c                        | 10 +++++-----
 3 files changed, 23 insertions(+), 20 deletions(-)

diff --git a/include/system/memory_cached.h b/include/system/memory_cached.h
index 760ecb38c19..09d46821bec 100644
--- a/include/system/memory_cached.h
+++ b/include/system/memory_cached.h
@@ -51,12 +51,12 @@ struct MemoryRegionCache {
 
 #define SUFFIX       _cached_slow
 #define ARG1         cache
-#define ARG1_DECL    MemoryRegionCache *cache
+#define ARG1_DECL    const MemoryRegionCache *cache
 #include "system/memory_ldst.h.inc"
 
 /* Inline fast path for direct RAM access.  */
 static inline
-uint8_t address_space_ldub_cached(MemoryRegionCache *cache, hwaddr addr,
+uint8_t address_space_ldub_cached(const MemoryRegionCache *cache, hwaddr addr,
                                   MemTxAttrs attrs, MemTxResult *result)
 {
     assert(addr < cache->len);
@@ -68,7 +68,7 @@ uint8_t address_space_ldub_cached(MemoryRegionCache *cache, hwaddr addr,
 }
 
 static inline
-void address_space_stb_cached(MemoryRegionCache *cache,
+void address_space_stb_cached(const MemoryRegionCache *cache,
                               hwaddr addr, uint8_t val,
                               MemTxAttrs attrs, MemTxResult *result)
 {
@@ -93,7 +93,7 @@ void address_space_stb_cached(MemoryRegionCache *cache,
 
 #define SUFFIX       _cached
 #define ARG1         cache
-#define ARG1_DECL    MemoryRegionCache *cache
+#define ARG1_DECL    const MemoryRegionCache *cache
 #include "system/memory_ldst_phys.h.inc"
 
 /**
@@ -145,7 +145,7 @@ static inline void address_space_cache_init_empty(MemoryRegionCache *cache)
  * address that was passed to @address_space_cache_init.
  * @access_len: The number of bytes that were written starting at @addr.
  */
-void address_space_cache_invalidate(MemoryRegionCache *cache,
+void address_space_cache_invalidate(const MemoryRegionCache *cache,
                                     hwaddr addr,
                                     hwaddr access_len);
 
@@ -160,9 +160,9 @@ void address_space_cache_destroy(MemoryRegionCache *cache);
  * Internal functions, part of the implementation of address_space_read_cached
  * and address_space_write_cached.
  */
-MemTxResult address_space_read_cached_slow(MemoryRegionCache *cache,
+MemTxResult address_space_read_cached_slow(const MemoryRegionCache *cache,
                                            hwaddr addr, void *buf, hwaddr len);
-MemTxResult address_space_write_cached_slow(MemoryRegionCache *cache,
+MemTxResult address_space_write_cached_slow(const MemoryRegionCache *cache,
                                             hwaddr addr, const void *buf,
                                             hwaddr len);
 
@@ -175,7 +175,7 @@ MemTxResult address_space_write_cached_slow(MemoryRegionCache *cache,
  * @len: length of the data transferred
  */
 static inline MemTxResult
-address_space_read_cached(MemoryRegionCache *cache, hwaddr addr,
+address_space_read_cached(const MemoryRegionCache *cache, hwaddr addr,
                           void *buf, hwaddr len)
 {
     assert(addr < cache->len && len <= cache->len - addr);
@@ -197,7 +197,7 @@ address_space_read_cached(MemoryRegionCache *cache, hwaddr addr,
  * @len: length of the data transferred
  */
 static inline MemTxResult
-address_space_write_cached(MemoryRegionCache *cache, hwaddr addr,
+address_space_write_cached(const MemoryRegionCache *cache, hwaddr addr,
                            const void *buf, hwaddr len)
 {
     assert(addr < cache->len && len <= cache->len - addr);
diff --git a/include/system/memory_ldst_cached.h.inc b/include/system/memory_ldst_cached.h.inc
index d7834f852c4..b4c696bff1f 100644
--- a/include/system/memory_ldst_cached.h.inc
+++ b/include/system/memory_ldst_cached.h.inc
@@ -24,7 +24,8 @@
 #define LD_P(size) \
     glue(glue(ld, size), glue(ENDIANNESS, _p))
 
-static inline uint16_t ADDRESS_SPACE_LD_CACHED(uw)(MemoryRegionCache *cache,
+static inline
+uint16_t ADDRESS_SPACE_LD_CACHED(uw)(const MemoryRegionCache *cache,
     hwaddr addr, MemTxAttrs attrs, MemTxResult *result)
 {
     assert(addr < cache->len && 2 <= cache->len - addr);
@@ -36,7 +37,8 @@ static inline uint16_t ADDRESS_SPACE_LD_CACHED(uw)(MemoryRegionCache *cache,
     }
 }
 
-static inline uint32_t ADDRESS_SPACE_LD_CACHED(l)(MemoryRegionCache *cache,
+static inline
+uint32_t ADDRESS_SPACE_LD_CACHED(l)(const MemoryRegionCache *cache,
     hwaddr addr, MemTxAttrs attrs, MemTxResult *result)
 {
     assert(addr < cache->len && 4 <= cache->len - addr);
@@ -48,7 +50,8 @@ static inline uint32_t ADDRESS_SPACE_LD_CACHED(l)(MemoryRegionCache *cache,
     }
 }
 
-static inline uint64_t ADDRESS_SPACE_LD_CACHED(q)(MemoryRegionCache *cache,
+static inline
+uint64_t ADDRESS_SPACE_LD_CACHED(q)(const MemoryRegionCache *cache,
     hwaddr addr, MemTxAttrs attrs, MemTxResult *result)
 {
     assert(addr < cache->len && 8 <= cache->len - addr);
@@ -71,7 +74,7 @@ static inline uint64_t ADDRESS_SPACE_LD_CACHED(q)(MemoryRegionCache *cache,
 #define ST_P(size) \
     glue(glue(st, size), glue(ENDIANNESS, _p))
 
-static inline void ADDRESS_SPACE_ST_CACHED(w)(MemoryRegionCache *cache,
+static inline void ADDRESS_SPACE_ST_CACHED(w)(const MemoryRegionCache *cache,
     hwaddr addr, uint16_t val, MemTxAttrs attrs, MemTxResult *result)
 {
     assert(addr < cache->len && 2 <= cache->len - addr);
@@ -82,7 +85,7 @@ static inline void ADDRESS_SPACE_ST_CACHED(w)(MemoryRegionCache *cache,
     }
 }
 
-static inline void ADDRESS_SPACE_ST_CACHED(l)(MemoryRegionCache *cache,
+static inline void ADDRESS_SPACE_ST_CACHED(l)(const MemoryRegionCache *cache,
     hwaddr addr, uint32_t val, MemTxAttrs attrs, MemTxResult *result)
 {
     assert(addr < cache->len && 4 <= cache->len - addr);
@@ -93,7 +96,7 @@ static inline void ADDRESS_SPACE_ST_CACHED(l)(MemoryRegionCache *cache,
     }
 }
 
-static inline void ADDRESS_SPACE_ST_CACHED(q)(MemoryRegionCache *cache,
+static inline void ADDRESS_SPACE_ST_CACHED(q)(const MemoryRegionCache *cache,
     hwaddr addr, uint64_t val, MemTxAttrs attrs, MemTxResult *result)
 {
     assert(addr < cache->len && 8 <= cache->len - addr);
diff --git a/system/physmem.c b/system/physmem.c
index 8327b7c3de1..5f1be89649e 100644
--- a/system/physmem.c
+++ b/system/physmem.c
@@ -3886,7 +3886,7 @@ int64_t address_space_cache_init(MemoryRegionCache *cache,
     return l;
 }
 
-void address_space_cache_invalidate(MemoryRegionCache *cache,
+void address_space_cache_invalidate(const MemoryRegionCache *cache,
                                     hwaddr addr,
                                     hwaddr access_len)
 {
@@ -3917,7 +3917,7 @@ void address_space_cache_destroy(MemoryRegionCache *cache)
  * address_space_cache_init.
  */
 static inline MemoryRegion *address_space_translate_cached(
-    MemoryRegionCache *cache, hwaddr addr, hwaddr *xlat,
+    const MemoryRegionCache *cache, hwaddr addr, hwaddr *xlat,
     hwaddr *plen, bool is_write, MemTxAttrs attrs)
 {
     MemoryRegionSection section;
@@ -3998,7 +3998,7 @@ static MemTxResult address_space_read_continue_cached(MemTxAttrs attrs,
  * out of line function when the target is an MMIO or IOMMU region.
  */
 MemTxResult
-address_space_read_cached_slow(MemoryRegionCache *cache, hwaddr addr,
+address_space_read_cached_slow(const MemoryRegionCache *cache, hwaddr addr,
                                    void *buf, hwaddr len)
 {
     hwaddr mr_addr, l;
@@ -4015,7 +4015,7 @@ address_space_read_cached_slow(MemoryRegionCache *cache, hwaddr addr,
  * out of line function when the target is an MMIO or IOMMU region.
  */
 MemTxResult
-address_space_write_cached_slow(MemoryRegionCache *cache, hwaddr addr,
+address_space_write_cached_slow(const MemoryRegionCache *cache, hwaddr addr,
                                     const void *buf, hwaddr len)
 {
     hwaddr mr_addr, l;
@@ -4028,7 +4028,7 @@ address_space_write_cached_slow(MemoryRegionCache *cache, hwaddr addr,
                                                buf, len, mr_addr, l, mr);
 }
 
-#define ARG1_DECL                MemoryRegionCache *cache
+#define ARG1_DECL                const MemoryRegionCache *cache
 #define ARG1                     cache
 #define SUFFIX                   _cached_slow
 #define TRANSLATE(...)           address_space_translate_cached(cache, __VA_ARGS__)
-- 
2.53.0