实现屏幕管理器大致的框架

kernel/common/printk.c

@@ -103,38 +103,17 @@ int printk_init(const int char_size_x, const int char_size_y)
     // 初始化自旋锁
     spin_init(&printk_lock);
 
-    // ======== 临时的将物理地址填写到0x0000000003000000处 之后会在mm内将帧缓存区重新映射=====
-
-    ul global_CR3 = (ul)get_CR3();
-    ul fb_virt_addr = (ul)pos.FB_address;
-    ul fb_phys_addr = VBE_FB_phys_addr;
-
-    // 计算帧缓冲区的线性地址对应的pml4页表项的地址
-    ul *tmp = phys_2_virt((ul *)((ul)global_CR3 & (~0xfffUL)) + ((fb_virt_addr >> PAGE_GDT_SHIFT) & 0x1ff));
-
-    tmp = phys_2_virt((ul *)(*tmp & (~0xfffUL)) + ((fb_virt_addr >> PAGE_1G_SHIFT) & 0x1ff));
-
-    ul *tmp1;
-    // 初始化2M物理页
-    for (ul i = 0; i < (pos.FB_length << 2); i += PAGE_2M_SIZE)
-    {
-        // 计算当前2M物理页对应的pdt的页表项的物理地址
-        tmp1 = phys_2_virt((ul *)(*tmp & (~0xfffUL)) + (((fb_virt_addr + i) >> PAGE_2M_SHIFT) & 0x1ff));
-
-        // 页面写穿，禁止缓存
-        set_pdt(tmp1, mk_pdt((ul)fb_phys_addr + i, PAGE_KERNEL_PAGE | PAGE_PWT | PAGE_PCD));
-    }
-
-    flush_tlb();
-
     pos.x = 0;
     pos.y = 0;
 
     cls();
-
+    
+    io_mfence();
     kdebug("width=%d\theight=%d", pos.width, pos.height);
     // 由于此时系统并未启用双缓冲，因此关闭滚动动画
     printk_disable_animation();
+
+    io_mfence();
     return 0;
 }
 
@@ -960,4 +939,3 @@ int sprintk(char *buf, const char *fmt, ...)
 
     return count;
 }
-