1 #pragma once 2 3 #include <common/glib.h> 4 #include <mm/mm-types.h> 5 #include <process/process.h> 6 7 extern void rs_pseudo_map_phys(uint64_t virt_addr, uint64_t phys_addr, uint64_t size); 8 extern void rs_map_phys(uint64_t virt_addr, uint64_t phys_addr, uint64_t size, uint64_t flags); 9 extern uint64_t rs_unmap_at_low_addr(); 10 11 // 内核层的起始地址 12 #define PAGE_OFFSET 0xffff800000000000UL 13 #define KERNEL_BASE_LINEAR_ADDR 0xffff800000000000UL 14 #define USER_MAX_LINEAR_ADDR 0x00007fffffffffffUL 15 // MMIO虚拟地址空间：1TB 16 #define MMIO_BASE 0xffffa10000000000UL 17 #define MMIO_TOP 0xffffa20000000000UL 18 19 #define PAGE_4K_SHIFT 12 20 #define PAGE_2M_SHIFT 21 21 #define PAGE_1G_SHIFT 30 22 #define PAGE_GDT_SHIFT 39 23 24 // 不同大小的页的容量 25 #define PAGE_4K_SIZE (1UL << PAGE_4K_SHIFT) 26 #define PAGE_2M_SIZE (1UL << PAGE_2M_SHIFT) 27 #define PAGE_1G_SIZE (1UL << PAGE_1G_SHIFT) 28 29 // 屏蔽低于x的数值 30 #define PAGE_4K_MASK (~(PAGE_4K_SIZE - 1)) 31 #define PAGE_2M_MASK (~(PAGE_2M_SIZE - 1)) 32 33 // 将addr按照x的上边界对齐 34 #define PAGE_4K_ALIGN(addr) (((unsigned long)(addr) + PAGE_4K_SIZE - 1) & PAGE_4K_MASK) 35 #define PAGE_2M_ALIGN(addr) (((unsigned long)(addr) + PAGE_2M_SIZE - 1) & PAGE_2M_MASK) 36 37 // 虚拟地址与物理地址转换 38 #define virt_2_phys(addr) ((unsigned long)(addr)-PAGE_OFFSET) 39 #define phys_2_virt(addr) ((unsigned long *)((unsigned long)(addr) + PAGE_OFFSET)) 40 41 // 在这个地址以上的虚拟空间，用来进行特殊的映射 42 #define SPECIAL_MEMOEY_MAPPING_VIRT_ADDR_BASE 0xffffa00000000000UL 43 #define FRAME_BUFFER_MAPPING_OFFSET 0x3000000UL 44 #define IO_APIC_MAPPING_OFFSET 0xfec00000UL 45 #define LOCAL_APIC_MAPPING_OFFSET 0xfee00000UL 46 #define AHCI_MAPPING_OFFSET 0xff200000UL // AHCI 映射偏移量,之后使用了4M的地址 47 48 // ===== 页面属性 ===== 49 // 页面在页表中已被映射 mapped=1 unmapped=0 50 #define PAGE_PGT_MAPPED (1 << 0) 51 52 // 内核初始化所占用的页 init-code=1 normal-code/data=0 53 #define PAGE_KERNEL_INIT (1 << 1) 54 55 // 1=设备MMIO映射的内存 0=物理内存 56 #define PAGE_DEVICE (1 << 2) 57 58 // 内核层页 kernel=1 memory=0 59 #define PAGE_KERNEL (1 << 3) 60 61 // 共享的页 shared=1 single-use=0 62 #define PAGE_SHARED (1 << 4) 63 64 // =========== 页表项权限 ======== 65 66 // bit 63 Execution Disable: 67 #define PAGE_XD (1UL << 63) 68 69 // bit 12 Page Attribute Table 70 #define PAGE_PAT (1UL << 12) 71 // 对于PTE而言，第7位是PAT 72 #define PAGE_4K_PAT (1UL << 7) 73 74 // bit 8 Global Page:1,global;0,part 75 #define PAGE_GLOBAL (1UL << 8) 76 77 // bit 7 Page Size:1,big page;0,small page; 78 #define PAGE_PS (1UL << 7) 79 80 // bit 6 Dirty:1,dirty;0,clean; 81 #define PAGE_DIRTY (1UL << 6) 82 83 // bit 5 Accessed:1,visited;0,unvisited; 84 #define PAGE_ACCESSED (1UL << 5) 85 86 // bit 4 Page Level Cache Disable 87 #define PAGE_PCD (1UL << 4) 88 89 // bit 3 Page Level Write Through 90 #define PAGE_PWT (1UL << 3) 91 92 // bit 2 User Supervisor:1,user and supervisor;0,supervisor; 93 #define PAGE_U_S (1UL << 2) 94 95 // bit 1 Read Write:1,read and write;0,read; 96 #define PAGE_R_W (1UL << 1) 97 98 // bit 0 Present:1,present;0,no present; 99 #define PAGE_PRESENT (1UL << 0) 100 101 // 1,0 102 #define PAGE_KERNEL_PGT (PAGE_R_W | PAGE_PRESENT) 103 104 // 1,0 105 #define PAGE_KERNEL_DIR (PAGE_R_W | PAGE_PRESENT) 106 107 // 1,0 (4级页表在3级页表中的页表项的属性) 108 #define PAGE_KERNEL_PDE (PAGE_R_W | PAGE_PRESENT) 109 110 // 7,1,0 111 #define PAGE_KERNEL_PAGE (PAGE_PS | PAGE_R_W | PAGE_PRESENT) 112 113 #define PAGE_KERNEL_4K_PAGE (PAGE_R_W | PAGE_PRESENT) 114 115 #define PAGE_USER_PGT (PAGE_U_S | PAGE_R_W | PAGE_PRESENT) 116 117 // 2,1,0 118 #define PAGE_USER_DIR (PAGE_U_S | PAGE_R_W | PAGE_PRESENT) 119 120 // 1,0 (4级页表在3级页表中的页表项的属性) 121 #define PAGE_USER_PDE (PAGE_U_S | PAGE_R_W | PAGE_PRESENT) 122 // 7,2,1,0 123 #define PAGE_USER_PAGE (PAGE_PS | PAGE_U_S | PAGE_R_W | PAGE_PRESENT) 124 125 #define PAGE_USER_4K_PAGE (PAGE_U_S | PAGE_R_W | PAGE_PRESENT) 126 127 /** 128 * @brief 刷新TLB的宏定义 129 * 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 130 */ 131 #define flush_tlb() \ 132 do \ 133 { \ 134 ul tmp; \ 135 io_mfence(); \ 136 __asm__ __volatile__("movq %%cr3, %0\n\t" \ 137 "movq %0, %%cr3\n\t" \ 138 : "=r"(tmp)::"memory"); \ 139 \ 140 } while (0); 141 142 143 // 导出内核程序的几个段的起止地址 144 extern char _text; 145 extern char _etext; 146 extern char _data; 147 extern char _edata; 148 extern char _rodata; 149 extern char _erodata; 150 extern char _bss; 151 extern char _ebss; 152 extern char _end; 153 154 /** 155 * @brief 读取CR3寄存器的值（存储了页目录的基地址） 156 * 157 * @return unsigned* cr3的值的指针 158 */ 159 unsigned long *get_CR3() 160 { 161 ul *tmp; 162 __asm__ __volatile__("movq %%cr3, %0\n\t" 163 : "=r"(tmp)::"memory"); 164 return tmp; 165 } 166 167 /* 168 * vm_area_struct中的vm_flags的可选值 169 * 对应的结构体请见mm-types.h 170 */ 171 #define VM_NONE 0 172 #define VM_READ (1 << 0) 173 #define VM_WRITE (1 << 1) 174 #define VM_EXEC (1 << 2) 175 #define VM_SHARED (1 << 3) 176 #define VM_IO (1 << 4) // MMIO的内存区域 177 #define VM_SOFTDIRTY (1 << 5) 178 #define VM_MAYSHARE (1 << 6) // 该vma可被共享 179 #define VM_USER (1 << 7) // 该vma可被用户态访问 180 #define VM_DONTCOPY (1 << 8) // 当fork的时候不拷贝该虚拟内存区域 181 182 /* VMA basic access permission flags */ 183 #define VM_ACCESS_FLAGS (VM_READ | VM_WRITE | VM_EXEC) 184