memory: Replace io_mem_read/write with memory_region_dispatch_read/write

Rather than retaining io_mem_read/write as simple wrappers around
the memory_region_dispatch_read/write functions, make the latter
public and change all the callers to use them, since we need to
touch all the callsites anyway to add MemTxAttrs and MemTxResult
support. Delete io_mem_read and io_mem_write entirely.

(All the callers currently pass MEMTXATTRS_UNSPECIFIED
and convert the return value back to bool or ignore it.)

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>

include/exec/exec-all.h

@@ -341,10 +341,6 @@ void phys_mem_set_alloc(void *(*alloc)(size_t, uint64_t *align));
 
 struct MemoryRegion *iotlb_to_region(CPUState *cpu,
                                      hwaddr index);
-bool io_mem_read(struct MemoryRegion *mr, hwaddr addr,
-                 uint64_t *pvalue, unsigned size);
-bool io_mem_write(struct MemoryRegion *mr, hwaddr addr,
-                  uint64_t value, unsigned size);
 
 void tlb_fill(CPUState *cpu, target_ulong addr, int is_write, int mmu_idx,
               uintptr_t retaddr);

include/exec/memory.h

@@ -1052,6 +1052,37 @@ void memory_global_dirty_log_stop(void);
 
 void mtree_info(fprintf_function mon_printf, void *f);
 
+/**
+ * memory_region_dispatch_read: perform a read directly to the specified
+ * MemoryRegion.
+ *
+ * @mr: #MemoryRegion to access
+ * @addr: address within that region
+ * @pval: pointer to uint64_t which the data is written to
+ * @size: size of the access in bytes
+ * @attrs: memory transaction attributes to use for the access
+ */
+MemTxResult memory_region_dispatch_read(MemoryRegion *mr,
+                                        hwaddr addr,
+                                        uint64_t *pval,
+                                        unsigned size,
+                                        MemTxAttrs attrs);
+/**
+ * memory_region_dispatch_write: perform a write directly to the specified
+ * MemoryRegion.
+ *
+ * @mr: #MemoryRegion to access
+ * @addr: address within that region
+ * @data: data to write
+ * @size: size of the access in bytes
+ * @attrs: memory transaction attributes to use for the access
+ */
+MemTxResult memory_region_dispatch_write(MemoryRegion *mr,
+                                         hwaddr addr,
+                                         uint64_t data,
+                                         unsigned size,
+                                         MemTxAttrs attrs);
+
 /**
  * address_space_init: initializes an address space
  *