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106 lines
3.6 KiB
C
106 lines
3.6 KiB
C
#include "video.h"
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#include <mm/mm.h>
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#include <common/printk.h>
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#include <driver/multiboot2/multiboot2.h>
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#include <driver/timers/timer.h>
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#include <common/kprint.h>
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#include <mm/mm.h>
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#include <mm/slab.h>
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#include <process/spinlock.h>
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// 每个时刻只能有1个进程新增定时任务
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spinlock_t video_timer_func_add_lock;
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#define REFRESH_INTERVAL 15 // 启动刷新帧缓冲区任务的时间间隔
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ul VBE_FB_phys_addr; // 由bootloader传来的帧缓存区的物理地址
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struct screen_info_t
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{
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int width, height;
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uint64_t length;
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uint64_t fb_vaddr, fb_paddr;
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uint64_t double_fb_vaddr;
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} sc_info;
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/**
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* @brief VBE帧缓存区的地址重新映射
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* 将帧缓存区映射到地址SPECIAL_MEMOEY_MAPPING_VIRT_ADDR_BASE处
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*/
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void init_frame_buffer(bool level)
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{
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kinfo("Re-mapping VBE frame buffer...");
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uint64_t global_CR3 = (uint64_t)get_CR3();
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if (level == false)
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{
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struct multiboot_tag_framebuffer_info_t info;
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int reserved;
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multiboot2_iter(multiboot2_get_Framebuffer_info, &info, &reserved);
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sc_info.fb_vaddr = SPECIAL_MEMOEY_MAPPING_VIRT_ADDR_BASE + FRAME_BUFFER_MAPPING_OFFSET;
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sc_info.fb_paddr = info.framebuffer_addr;
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sc_info.width = info.framebuffer_width;
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sc_info.height = info.framebuffer_height;
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sc_info.length = 1UL * sc_info.width * sc_info.height;
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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, true);
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set_pos_VBE_FB_addr((uint *)sc_info.fb_vaddr);
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}
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else // 高级初始化，增加双缓冲区的支持
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{
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// 申请双重缓冲区
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struct Page *p = alloc_pages(ZONE_NORMAL, PAGE_2M_ALIGN(sc_info.length << 2) / PAGE_2M_SIZE, 0);
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sc_info.double_fb_vaddr = (uint64_t)phys_2_virt(p->addr_phys);
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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, true);
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// 将原有的数据拷贝到double buffer里面
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memcpy((void *)sc_info.double_fb_vaddr, (void *)sc_info.fb_vaddr, sc_info.length << 2);
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set_pos_VBE_FB_addr((uint *)sc_info.double_fb_vaddr);
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}
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flush_tlb();
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kinfo("VBE frame buffer successfully Re-mapped!");
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}
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/**
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* @brief 刷新帧缓冲区
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*
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*/
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static void video_refresh_framebuffer()
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{
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// kdebug("pid%d flush fb", current_pcb->pid);
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memcpy((void *)sc_info.fb_vaddr, (void *)sc_info.double_fb_vaddr, (sc_info.length << 2));
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// 新增下一个刷新定时任务
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struct timer_func_list_t *tmp = (struct timer_func_list_t *)kmalloc(sizeof(struct timer_func_list_t), 0);
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spin_lock(&video_timer_func_add_lock);
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timer_func_init(tmp, &video_refresh_framebuffer, NULL, 10 * REFRESH_INTERVAL);
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timer_func_add(tmp);
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spin_unlock(&video_timer_func_add_lock);
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}
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/**
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* @brief 初始化显示模块，需先低级初始化才能高级初始化
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* @param level 初始化等级
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* false -> 低级初始化：不使用double buffer
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* true ->高级初始化：增加double buffer的支持
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* @return int
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*/
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int video_init(bool level)
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{
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init_frame_buffer(level);
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if (level)
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{
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spin_init(&video_timer_func_add_lock);
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// 启用双缓冲后，使能printk滚动动画
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// printk_enable_animation();
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// 初始化第一个屏幕刷新任务
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struct timer_func_list_t *tmp = (struct timer_func_list_t *)kmalloc(sizeof(struct timer_func_list_t), 0);
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timer_func_init(tmp, &video_refresh_framebuffer, NULL, REFRESH_INTERVAL);
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timer_func_add(tmp);
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}
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} |