Adding usb memory pool functions

Ubiquitous/XiZi_AIoT/services/drivers/usb/components/mem/usb_mem.c

@@ -134,4 +134,46 @@ void usb_free_mem_page(usb_mem_page_t page){
         header = 0;
 
     usb_mem_pool.header = header;
+}
+
+
+int usb_used_page_num_mem_pool(){
+    int header, tail, used_num;
+    header = usb_mem_pool.header;
+    tail = usb_mem_pool.tail;
+
+    used_num = tail - header;
+
+    if(used_num < 0)
+        used_num += MEM_POOL_SIZE;
+
+    return used_num;
+}
+
+
+uintptr_t usb_mem_page_phy2vir(uintptr_t phy_addr){
+    int header, used_num, cnt;
+    uintptr_t vir_addr = 0;
+
+    header = usb_mem_pool.header;
+    used_num = usb_used_page_num_mem_pool();
+
+    cnt = 0;
+    while(cnt < used_num){
+        if(usb_mem_pool.pages[header].phy_addr == phy_addr){
+            vir_addr = usb_mem_pool.pages[header].vir_addr;
+            break;
+        }
+
+
+        header++;
+        
+        if(header == MEM_POOL_SIZE - 1)
+            header = 0;
+
+
+        cnt++;
+    }
+
+    return vir_addr;
 }

Ubiquitous/XiZi_AIoT/services/drivers/usb/components/mem/usb_mem.h

@@ -60,7 +60,8 @@ int usb_mem_pool_init();
 void usb_mem_pool_destory();
 int usb_alloc_mem_page(usb_mem_page_t page);
 void usb_free_mem_page(usb_mem_page_t page);
-
+int usb_used_page_num_mem_pool();
+uintptr_t usb_mem_page_phy2vir(uintptr_t phy_addr);
 
 
 #endif