ram: Export last_ram_offset()

Is the only way of knowing the RAM size.
Signed-off-by: NJuan Quintela <quintela@redhat.com>
Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>

cpu-all.h

@@ -518,6 +518,7 @@ extern int mem_prealloc;
 #define TLB_MMIO        (1 << 5)
 
 void dump_exec_info(FILE *f, fprintf_function cpu_fprintf);
+ram_addr_t last_ram_offset(void);
 #endif /* !CONFIG_USER_ONLY */
 
 int cpu_memory_rw_debug(CPUArchState *env, target_ulong addr,

exec.c

@@ -2454,7 +2454,7 @@ static ram_addr_t find_ram_offset(ram_addr_t size)
     return offset;
 }
 
-static ram_addr_t last_ram_offset(void)
+ram_addr_t last_ram_offset(void)
 {
     RAMBlock *block;
     ram_addr_t last = 0;