From 1e8e6523dfde96cf359c5f329123f7cc0ca62d67 Mon Sep 17 00:00:00 2001
From: fslongjin <longjin@RinGoTek.cn>
Date: Sat, 20 Aug 2022 18:08:34 +0800
Subject: [PATCH] =?UTF-8?q?bugfix:=20mmio=E5=8C=BA=E5=9F=9F=E7=9A=84vma?=
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---
 kernel/mm/mmap.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/kernel/mm/mmap.c b/kernel/mm/mmap.c
index cd4b897a..b6fb249d 100644
--- a/kernel/mm/mmap.c
+++ b/kernel/mm/mmap.c
@@ -352,7 +352,12 @@ int mm_map_vma(struct vm_area_struct *vma, uint64_t paddr)
     // 获取物理地址对应的页面
     struct Page *pg;
     if (vma->vm_flags & VM_IO) // 对于mmio的内存，创建新的page结构体
-        pg = __create_mmio_page_struct(paddr);
+    {
+        if (unlikely(vma->anon_vma == NULL || vma->anon_vma->page == NULL))
+            pg = __create_mmio_page_struct(paddr);
+        else
+            pg = vma->anon_vma->page;
+    }
     else
         pg = Phy_to_2M_Page(paddr);