memory: learn about non-volatile memory region

[mirror_qemu.git] / include / exec / memory.h

diff --git a/include/exec/memory.h b/include/exec/memory.h
index d0c7f0d9e9fa55a4d33fab8b8f47ad8501135d55..8e61450de328144283f06de00311bf60abe85312 100644 (file)
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -355,6 +355,7 @@ struct MemoryRegion {
     bool ram;
     bool subpage;
     bool readonly; /* For RAM regions */
+    bool nonvolatile;
     bool rom_device;
     bool flush_coalesced_mmio;
     bool global_locking;
@@ -480,6 +481,7 @@ static inline FlatView *address_space_to_flatview(AddressSpace *as)
  * @offset_within_address_space: the address of the first byte of the section
  *     relative to the region's address space
  * @readonly: writes to this section are ignored
+ * @nonvolatile: this section is non-volatile
  */
 struct MemoryRegionSection {
     MemoryRegion *mr;
@@ -488,6 +490,7 @@ struct MemoryRegionSection {
     Int128 size;
     hwaddr offset_within_address_space;
     bool readonly;
+    bool nonvolatile;
 };
 
 /**
@@ -1170,6 +1173,17 @@ static inline bool memory_region_is_rom(MemoryRegion *mr)
     return mr->ram && mr->readonly;
 }
 
+/**
+ * memory_region_is_nonvolatile: check whether a memory region is non-volatile
+ *
+ * Returns %true is a memory region is non-volatile memory.
+ *
+ * @mr: the memory region being queried
+ */
+static inline bool memory_region_is_nonvolatile(MemoryRegion *mr)
+{
+    return mr->nonvolatile;
+}
 
 /**
  * memory_region_get_fd: Get a file descriptor backing a RAM memory region.
@@ -1341,6 +1355,17 @@ void memory_region_reset_dirty(MemoryRegion *mr, hwaddr addr,
  */
 void memory_region_set_readonly(MemoryRegion *mr, bool readonly);
 
+/**
+ * memory_region_set_nonvolatile: Turn a memory region non-volatile
+ *
+ * Allows a memory region to be marked as non-volatile.
+ * only useful on RAM regions.
+ *
+ * @mr: the region being updated.
+ * @nonvolatile: whether rhe region is to be non-volatile.
+ */
+void memory_region_set_nonvolatile(MemoryRegion *mr, bool nonvolatile);
+
 /**
  * memory_region_rom_device_set_romd: enable/disable ROMD mode
  *