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将内核定位到高地址（存在bug，中断时会访问低地址）

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This commit is contained in:
fslongjin
2022-04-10 21:30:16 +08:00
parent 3063a340e2
commit f5f36aafd8
23 changed files with 689 additions and 238 deletions
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84
kernel/mm/mm.c
View File

@ -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
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...");
@ -190,22 +190,16 @@ void mm_init()
}
global_CR3 = get_CR3();
//root_page_table_phys_addr = global_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));
kdebug("1.memory_management_struct.bmp:%#018lx\tzone->count_pages_using:%d\tzone_struct->count_pages_free:%d", *memory_management_struct.bmp, memory_management_struct.zones_struct->count_pages_using, memory_management_struct.zones_struct->count_pages_free);
//kinfo("Cleaning page table remapping at 0x0000");
kinfo("Memory management unit initialize complete!");
/*
kinfo("Cleaning page table remapping at 0x0000");
for (int i = 0; i < 10; ++i)
*(phys_2_virt(global_CR3) + i) = 0UL;
kinfo("Successfully cleaned page table remapping!\n");
*/
flush_tlb();
// 初始化slab内存池
slab_init();
@ -424,8 +418,9 @@ void free_pages(struct Page *page, int number)
*/
void page_table_init()
{
kinfo("Initializing page table...");
kinfo("Re-Initializing page table...");
global_CR3 = get_CR3();
/*
// 由于CR3寄存器的[11..0]位是PCID标志位，因此将低12位置0后，就是PML4页表的基地址
ul *pml4_addr = (ul *)((ul)phys_2_virt((ul)global_CR3 & (~0xfffUL)));
kdebug("PML4 addr=%#018lx *pml4=%#018lx", pml4_addr, *pml4_addr);
@ -435,7 +430,7 @@ void page_table_init()
ul *pd_addr = phys_2_virt(*pdpt_addr & (~0xfffUL));
kdebug("pd addr=%#018lx *pd=%#018lx", pd_addr, *pd_addr);
*/
ul *tmp_addr;
for (int i = 0; i < memory_management_struct.count_zones; ++i)
{
@ -447,6 +442,8 @@ void page_table_init()
for (int j = 0; j < z->count_pages; ++j)
{
mm_map_phys_addr((ul)phys_2_virt(p->addr_phys), p->addr_phys, PAGE_2M_SIZE, PAGE_KERNEL_PAGE);
/*
// 计算出PML4页表中的页表项的地址
tmp_addr = (ul *)((ul)pml4_addr + ((((ul)phys_2_virt(p->addr_phys)) >> PAGE_GDT_SHIFT) & 0x1ff) * 8);
@ -472,7 +469,7 @@ void page_table_init()
// 填入pd页表的页表项，映射2MB物理页
set_pdt(tmp_addr, mk_pdt(virt_2_phys(p->addr_phys), PAGE_KERNEL_PAGE));
*/
// 测试
if (j % 50 == 0)
kdebug("pd_addr=%#018lx, *pd_addr=%#018lx", tmp_addr, *tmp_addr);
@ -569,27 +566,77 @@ void mm_map_phys_addr(ul virt_addr_start, ul phys_addr_start, ul length, ul flag
flush_tlb();
}
void mm_map_phys_addr_user(ul virt_addr_start, ul phys_addr_start, ul length, ul flags)
{
global_CR3 = get_CR3();
// 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)
{
ul *virt_addr = kmalloc(PAGE_4K_SIZE, 0);
set_pml4t(tmp, mk_pml4t(virt_2_phys(virt_addr), PAGE_USER_PGT));
}
else
kdebug("*tmp != 0!!! \t tmp = %#018lx\t *tmp = %#018lx",tmp, *tmp);
tmp = phys_2_virt((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), PAGE_USER_DIR));
}
else
kdebug("*tmp != 0!!! \t tmp = %#018lx\t *tmp = %#018lx",tmp, *tmp);
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 = phys_2_virt((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 | PAGE_USER_PAGE));
kdebug("mk_pdt((ul)phys_addr_start + i, flags | PAGE_USER_PAGE) = %#018lx",mk_pdt((ul)phys_addr_start + i, flags | PAGE_USER_PAGE));
}
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 proc_page_table_addr 页表的基地址
* @param is_phys 页表的基地址是否为物理地址
* @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)
void mm_map_proc_page_table(ul *proc_page_table_addr, bool is_phys, 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);
ul *tmp;
if (is_phys)
tmp = phys_2_virt((ul *)((ul)proc_page_table_addr & (~0xfffUL)) + ((virt_addr_start >> PAGE_GDT_SHIFT) & 0x1ff));
else
tmp = (ul *)((ul)proc_page_table_addr & (~0xfffUL)) + ((virt_addr_start >> PAGE_GDT_SHIFT) & 0x1ff);
kdebug("tmp = %#018lx", tmp);
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)));
}
kdebug("*tmp = %#018lx", *tmp);
tmp = (ul *)(*tmp & (~0xfffUL)) + ((virt_addr_start >> PAGE_1G_SHIFT) & 0x1ff);
if (is_phys)
tmp = phys_2_virt((ul *)(*tmp & (~0xfffUL)) + ((virt_addr_start >> PAGE_1G_SHIFT) & 0x1ff));
else
tmp = (ul *)(*tmp & (~0xfffUL)) + ((virt_addr_start >> PAGE_1G_SHIFT) & 0x1ff);
if (*tmp == 0)
{
@ -602,7 +649,10 @@ void mm_map_proc_page_table(ul *proc_page_table_addr, ul virt_addr_start, ul phy
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));
if (is_phys)
tmp1 = phys_2_virt(((ul *)(*tmp & (~0xfffUL)) + (((ul)(virt_addr_start + i) >> PAGE_2M_SHIFT) & 0x1ff)));
else
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)));

10
kernel/mm/mm.h
View File

@ -8,7 +8,7 @@
// 内核层的起始地址
#define PAGE_OFFSET ((unsigned long)0xffff800000000000)
#define KERNEL_BASE_PHYS_ADDR ((unsigned long)0xffff800000000000)
#define KERNEL_BASE_LINEAR_ADDR ((unsigned long)0xffff800000000000)
#define PAGE_4K_SHIFT 12
#define PAGE_2M_SHIFT 21
@ -365,10 +365,14 @@ void mm_map_phys_addr(ul virt_addr_start, ul phys_addr_start, ul length, ul flag
/**
* @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 proc_page_table_addr 页表的基地址
* @param is_phys 页表的基地址是否为物理地址
* @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);
void mm_map_proc_page_table(ul *proc_page_table_addr, bool is_phys, ul virt_addr_start, ul phys_addr_start, ul length, ul flags, bool user);
void mm_map_phys_addr_user(ul virt_addr_start, ul phys_addr_start, ul length, ul flags);