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Code Issues Releases Wiki Activity

将内核层空间移动到0xffff800000000000

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This commit is contained in:
fslongjin
2022-04-09 21:11:07 +08:00
parent 24b351c9ec
commit 05dc7ac73b
14 changed files with 321 additions and 175 deletions
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48
kernel/mm/mm.c
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@ -6,7 +6,7 @@
ul Total_Memory = 0;
ul total_2M_pages = 0;
static ul root_page_table_phys_addr=0; // 内核层根页表的物理地址
void mm_init()
{
kinfo("Initializing memory management unit...");
@ -190,7 +190,7 @@ void mm_init()
}
global_CR3 = get_CR3();
//root_page_table_phys_addr = global_CR3;
kdebug("global_CR3\t:%#018lx", global_CR3);
kdebug("*global_CR3\t:%#018lx", *phys_2_virt(global_CR3) & (~0xff));
kdebug("**global_CR3\t:%#018lx", *phys_2_virt(*phys_2_virt(global_CR3) & (~0xff)) & (~0xff));
@ -539,7 +539,7 @@ void mm_map_phys_addr(ul virt_addr_start, ul phys_addr_start, ul length, ul flag
{
global_CR3 = get_CR3();
// 计算帧缓冲区的线性地址对应的pml4页表项的地址
// 计算线性地址对应的pml4页表项的地址
ul *tmp = phys_2_virt((ul *)((ul)global_CR3 & (~0xfffUL)) + ((virt_addr_start >> PAGE_GDT_SHIFT) & 0x1ff));
if (*tmp == 0)
{
@ -566,5 +566,47 @@ void mm_map_phys_addr(ul virt_addr_start, ul phys_addr_start, ul length, ul flag
set_pdt(tmp1, mk_pdt((ul)phys_addr_start + i, flags));
}
flush_tlb();
}
/**
* @brief 将将物理地址填写到进程的页表的函数
*
* @param proc_page_table_addr 进程的页表的虚拟基地址
* @param virt_addr_start 要映射到的虚拟地址的起始位置
* @param phys_addr_start 物理地址的起始位置
* @param length 要映射的区域的长度（字节）
* @param user 用户态是否可访问
*/
void mm_map_proc_page_table(ul *proc_page_table_addr, ul virt_addr_start, ul phys_addr_start, ul length, ul flags, bool user)
{
// 计算线性地址对应的pml4页表项的地址
ul *tmp = (ul *)((ul)proc_page_table_addr & (~0xfffUL)) + ((virt_addr_start >> PAGE_GDT_SHIFT) & 0x1ff);
if (*tmp == 0)
{
ul *virt_addr = kmalloc(PAGE_4K_SIZE, 0);
set_pml4t(tmp, mk_pml4t(virt_2_phys(virt_addr), (user ? PAGE_USER_PGT : PAGE_KERNEL_PGT)));
}
tmp = (ul *)(*tmp & (~0xfffUL)) + ((virt_addr_start >> PAGE_1G_SHIFT) & 0x1ff);
if (*tmp == 0)
{
ul *virt_addr = kmalloc(PAGE_4K_SIZE, 0);
set_pdpt(tmp, mk_pdpt(virt_2_phys(virt_addr), (user ? PAGE_USER_DIR : PAGE_KERNEL_DIR)));
}
ul *tmp1;
// 初始化2M物理页
for (ul i = 0; i < (length); 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 = ((ul *)(*tmp & (~0xfffUL)) + (((ul)(virt_addr_start + i) >> PAGE_2M_SHIFT) & 0x1ff));
// 页面写穿，禁止缓存
set_pdt(tmp1, mk_pdt((ul)phys_addr_start + i, flags | (user ? PAGE_USER_PAGE : PAGE_KERNEL_PAGE)));
}
flush_tlb();
}