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Code Issues Releases Wiki Activity

🐛 bug fix

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This commit is contained in:
fslongjin
2022-03-02 13:07:13 +08:00
parent db8604c1e3
commit e573e6f1db
7 changed files with 85 additions and 29 deletions
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8
kernel/mm/mm.c
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@ -492,7 +492,7 @@ void init_frame_buffer()
{
kinfo("Re-mapping VBE frame buffer...");
global_CR3 = get_CR3();
ul fb_virt_addr = 0xffff800003000000;
ul fb_virt_addr = 0xffff800008000000;
ul fb_phys_addr = get_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
@ -514,16 +514,16 @@ void init_frame_buffer()
ul vbe_fb_length = get_VBE_FB_length();
ul *tmp1;
// 初始化2M物理页
for (ul i = 0; i < vbe_fb_length; i += PAGE_2M_SIZE)
for (ul i = 0; i < (PAGE_2M_SIZE<<3); 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));
tmp1 = phys_2_virt((ul *)(*tmp & (~0xfffUL)) + (((ul)(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));
}
set_pos_VBE_FB_addr(fb_virt_addr);
set_pos_VBE_FB_addr((uint*)fb_virt_addr);
flush_tlb();
kinfo("VBE frame buffer successfully Re-mapped!");
}