xref: /DragonOS/kernel/src/mm/mm.h (revision 46e234aef65c081393fb7652e0ad2bae26786ce4) 
1 #pragma once
2 
3 #include <common/glib.h>
4 #include <process/process.h>
5 
6 extern void rs_pseudo_map_phys(uint64_t virt_addr, uint64_t phys_addr, uint64_t size);
7 extern void rs_map_phys(uint64_t virt_addr, uint64_t phys_addr, uint64_t size, uint64_t flags);
8 extern uint64_t rs_unmap_at_low_addr();
9 
10 // 内核层的起始地址
11 #define PAGE_OFFSET 0xffff800000000000UL
12 #define KERNEL_BASE_LINEAR_ADDR 0xffff800000000000UL
13 #define USER_MAX_LINEAR_ADDR 0x00007fffffffffffUL
14 // MMIO虚拟地址空间：1TB
15 #define MMIO_BASE 0xffffa10000000000UL
16 #define MMIO_TOP 0xffffa20000000000UL
17 
18 #define PAGE_4K_SHIFT 12
19 #define PAGE_2M_SHIFT 21
20 #define PAGE_1G_SHIFT 30
21 #define PAGE_GDT_SHIFT 39
22 
23 // 不同大小的页的容量
24 #define PAGE_4K_SIZE (1UL << PAGE_4K_SHIFT)
25 #define PAGE_2M_SIZE (1UL << PAGE_2M_SHIFT)
26 #define PAGE_1G_SIZE (1UL << PAGE_1G_SHIFT)
27 
28 // 屏蔽低于x的数值
29 #define PAGE_4K_MASK (~(PAGE_4K_SIZE - 1))
30 #define PAGE_2M_MASK (~(PAGE_2M_SIZE - 1))
31 
32 // 将addr按照x的上边界对齐
33 #define PAGE_4K_ALIGN(addr) (((unsigned long)(addr) + PAGE_4K_SIZE - 1) & PAGE_4K_MASK)
34 #define PAGE_2M_ALIGN(addr) (((unsigned long)(addr) + PAGE_2M_SIZE - 1) & PAGE_2M_MASK)
35 
36 // 虚拟地址与物理地址转换
37 #define virt_2_phys(addr) ((unsigned long)(addr)-PAGE_OFFSET)
38 #define phys_2_virt(addr) ((unsigned long *)((unsigned long)(addr) + PAGE_OFFSET))
39 
40 // 在这个地址以上的虚拟空间，用来进行特殊的映射
41 #define SPECIAL_MEMOEY_MAPPING_VIRT_ADDR_BASE 0xffffa00000000000UL
42 #define FRAME_BUFFER_MAPPING_OFFSET 0x3000000UL
43 #define IO_APIC_MAPPING_OFFSET 0xfec00000UL
44 #define LOCAL_APIC_MAPPING_OFFSET 0xfee00000UL
45 #define AHCI_MAPPING_OFFSET 0xff200000UL // AHCI 映射偏移量,之后使用了4M的地址
46 
47 // ===== 页面属性 =====
48 // 页面在页表中已被映射 mapped=1 unmapped=0
49 #define PAGE_PGT_MAPPED (1 << 0)
50 
51 // 内核初始化所占用的页 init-code=1 normal-code/data=0
52 #define PAGE_KERNEL_INIT (1 << 1)
53 
54 // 1=设备MMIO映射的内存 0=物理内存
55 #define PAGE_DEVICE (1 << 2)
56 
57 // 内核层页 kernel=1 memory=0
58 #define PAGE_KERNEL (1 << 3)
59 
60 // 共享的页 shared=1 single-use=0
61 #define PAGE_SHARED (1 << 4)
62 
63 // =========== 页表项权限 ========
64 
65 //	bit 63	Execution Disable:
66 #define PAGE_XD (1UL << 63)
67 
68 //	bit 12	Page Attribute Table
69 #define PAGE_PAT (1UL << 12)
70 // 对于PTE而言，第7位是PAT
71 #define PAGE_4K_PAT (1UL << 7)
72 
73 //	bit 8	Global Page:1,global;0,part
74 #define PAGE_GLOBAL (1UL << 8)
75 
76 //	bit 7	Page Size:1,big page;0,small page;
77 #define PAGE_PS (1UL << 7)
78 
79 //	bit 6	Dirty:1,dirty;0,clean;
80 #define PAGE_DIRTY (1UL << 6)
81 
82 //	bit 5	Accessed:1,visited;0,unvisited;
83 #define PAGE_ACCESSED (1UL << 5)
84 
85 //	bit 4	Page Level Cache Disable
86 #define PAGE_PCD (1UL << 4)
87 
88 //	bit 3	Page Level Write Through
89 #define PAGE_PWT (1UL << 3)
90 
91 //	bit 2	User Supervisor:1,user and supervisor;0,supervisor;
92 #define PAGE_U_S (1UL << 2)
93 
94 //	bit 1	Read Write:1,read and write;0,read;
95 #define PAGE_R_W (1UL << 1)
96 
97 //	bit 0	Present:1,present;0,no present;
98 #define PAGE_PRESENT (1UL << 0)
99 
100 // 1,0
101 #define PAGE_KERNEL_PGT (PAGE_R_W | PAGE_PRESENT)
102 
103 // 1,0
104 #define PAGE_KERNEL_DIR (PAGE_R_W | PAGE_PRESENT)
105 
106 // 1,0 (4级页表在3级页表中的页表项的属性)
107 #define PAGE_KERNEL_PDE (PAGE_R_W | PAGE_PRESENT)
108 
109 // 7,1,0
110 #define PAGE_KERNEL_PAGE (PAGE_PS | PAGE_R_W | PAGE_PRESENT)
111 
112 #define PAGE_KERNEL_4K_PAGE (PAGE_R_W | PAGE_PRESENT)
113 
114 #define PAGE_USER_PGT (PAGE_U_S | PAGE_R_W | PAGE_PRESENT)
115 
116 // 2,1,0
117 #define PAGE_USER_DIR (PAGE_U_S | PAGE_R_W | PAGE_PRESENT)
118 
119 // 1,0 (4级页表在3级页表中的页表项的属性)
120 #define PAGE_USER_PDE (PAGE_U_S | PAGE_R_W | PAGE_PRESENT)
121 // 7,2,1,0
122 #define PAGE_USER_PAGE (PAGE_PS | PAGE_U_S | PAGE_R_W | PAGE_PRESENT)
123 
124 #define PAGE_USER_4K_PAGE (PAGE_U_S | PAGE_R_W | PAGE_PRESENT)
125 
126 /**
127  * @brief 刷新TLB的宏定义
128  * 由于任何写入cr3的操作都会刷新TLB，因此这个宏定义可以刷新TLB
129  */
130 #define flush_tlb()                                  \
131     do                                               \
132     {                                                \
133         ul tmp;                                      \
134         io_mfence();                                 \
135         __asm__ __volatile__("movq %%cr3, %0\n\t"    \
136                              "movq %0, %%cr3\n\t"    \
137                              : "=r"(tmp)::"memory"); \
138                                                      \
139     } while (0);
140 
141 
142 // 导出内核程序的几个段的起止地址
143 extern char _text;
144 extern char _etext;
145 extern char _data;
146 extern char _edata;
147 extern char _rodata;
148 extern char _erodata;
149 extern char _bss;
150 extern char _ebss;
151 extern char _end;
152 
153 /**
154  * @brief 读取CR3寄存器的值（存储了页目录的基地址）
155  *
156  * @return unsigned*  cr3的值的指针
157  */
158 unsigned long *get_CR3()
159 {
160     ul *tmp;
161     __asm__ __volatile__("movq %%cr3, %0\n\t"
162                          : "=r"(tmp)::"memory");
163     return tmp;
164 }
165 
166 /*
167  *  vm_area_struct中的vm_flags的可选值
168  * 对应的结构体请见mm-types.h
169  */
170 #define VM_NONE 0
171 #define VM_READ (1 << 0)
172 #define VM_WRITE (1 << 1)
173 #define VM_EXEC (1 << 2)
174 #define VM_SHARED (1 << 3)
175 #define VM_IO (1 << 4) // MMIO的内存区域
176 #define VM_SOFTDIRTY (1 << 5)
177 #define VM_MAYSHARE (1 << 6) // 该vma可被共享
178 #define VM_USER (1 << 7)     // 该vma可被用户态访问
179 #define VM_DONTCOPY (1 << 8) // 当fork的时候不拷贝该虚拟内存区域
180 
181 /* VMA basic access permission flags */
182 #define VM_ACCESS_FLAGS (VM_READ | VM_WRITE | VM_EXEC)
183