🆕 double buffer

kernel/driver/video/video.c

@@ -1,11 +1,97 @@
 #include "video.h"
+#include <mm/mm.h>
+#include <common/printk.h>
+#include <driver/multiboot2/multiboot2.h>
+#include <driver/timers/timer.h>
+#include <common/kprint.h>
+#include <mm/mm.h>
+#include <mm/slab.h>
+
+#define REFRESH_INTERVAL 15 // 启动刷新帧缓冲区任务的时间间隔
+
+ul VBE_FB_phys_addr; // 由bootloader传来的帧缓存区的物理地址
+struct screen_info_t
+{
+    int width, height;
+    uint64_t length;
+    uint64_t fb_vaddr, fb_paddr;
+    uint64_t double_fb_vaddr;
+} sc_info;
 
 /**
- * @brief 初始化显示模块
- * 
- * @return int 
+ * @brief VBE帧缓存区的地址重新映射
+ * 将帧缓存区映射到地址0xffff800003000000处
  */
-int video_init()
+void init_frame_buffer(bool level)
 {
+    kinfo("Re-mapping VBE frame buffer...");
 
+    uint64_t global_CR3 = (uint64_t)get_CR3();
+
+    if (level == false)
+    {
+        struct multiboot_tag_framebuffer_info_t info;
+        int reserved;
+
+        multiboot2_iter(multiboot2_get_Framebuffer_info, &info, &reserved);
+
+        sc_info.fb_vaddr = SPECIAL_MEMOEY_MAPPING_VIRT_ADDR_BASE + FRAME_BUFFER_MAPPING_OFFSET;
+
+        sc_info.fb_paddr = info.framebuffer_addr;
+        sc_info.width = info.framebuffer_width;
+        sc_info.height = info.framebuffer_height;
+
+        sc_info.length = 1UL * sc_info.width * sc_info.height;
+        mm_map_proc_page_table(global_CR3, true, sc_info.fb_vaddr, sc_info.fb_paddr, get_VBE_FB_length() << 2, PAGE_KERNEL_PAGE | PAGE_PWT | PAGE_PCD, false);
+        set_pos_VBE_FB_addr((uint *)sc_info.fb_vaddr);
+    }
+    else // 高级初始化，增加双缓冲区的支持
+    {
+        // 申请双重缓冲区
+        struct Page *p = alloc_pages(ZONE_NORMAL, PAGE_2M_ALIGN(sc_info.length << 2) / PAGE_2M_SIZE, 0);
+        sc_info.double_fb_vaddr = (uint64_t)phys_2_virt(p->addr_phys);
+        mm_map_proc_page_table(global_CR3, true, sc_info.double_fb_vaddr, p->addr_phys, PAGE_2M_ALIGN(sc_info.length << 2), PAGE_KERNEL_PAGE, false);
+
+        // 将原有的数据拷贝到double buffer里面
+        memcpy((void *)sc_info.double_fb_vaddr, (void *)sc_info.fb_vaddr, sc_info.length << 2);
+        set_pos_VBE_FB_addr((uint *)sc_info.double_fb_vaddr);
+    }
+
+    flush_tlb();
+    kinfo("VBE frame buffer successfully Re-mapped!");
+}
+
+/**
+ * @brief 刷新帧缓冲区
+ *
+ */
+static void video_refresh_framebuffer()
+{
+    memcpy((void *)sc_info.fb_vaddr, (void *)sc_info.double_fb_vaddr, (sc_info.length << 2));
+    // 新增下一个刷新定时任务
+    struct timer_func_list_t *tmp = (struct timer_func_list_t *)kmalloc(sizeof(struct timer_func_list_t), 0);
+    timer_func_init(tmp, &video_refresh_framebuffer, NULL, REFRESH_INTERVAL);
+    timer_func_add(tmp);
+}
+
+/**
+ * @brief 初始化显示模块，需先低级初始化才能高级初始化
+ * @param level 初始化等级
+ * false -> 低级初始化：不使用double buffer
+ * true ->高级初始化：增加double buffer的支持
+ * @return int
+ */
+int video_init(bool level)
+{
+    init_frame_buffer(level);
+    if (level)
+    {
+        // 启用双缓冲后，使能printk滚动动画
+        printk_enable_animation();
+        // 初始化第一个屏幕刷新任务
+        struct timer_func_list_t *tmp = (struct timer_func_list_t *)kmalloc(sizeof(struct timer_func_list_t), 0);
+        timer_func_init(tmp, &video_refresh_framebuffer, NULL, REFRESH_INTERVAL);
+        timer_func_add(tmp);
+
+    }
 }

kernel/driver/video/video.h

@@ -1,8 +1,11 @@
 #pragma once
-
+#include <common/glib.h>
+#include <stdbool.h>
 /**
- * @brief 初始化显示模块
- * 
- * @return int 
+ * @brief 初始化显示模块，需先低级初始化才能高级初始化
+ * @param level 初始化等级
+ * false -> 低级初始化：不使用double buffer
+ * true ->高级初始化：增加double buffer的支持
+ * @return int
  */
-int video_init();
+int video_init(bool level);