1 #pragma once 2 3 #include <common/glib.h> 4 #include <process/process.h> 5 6 #define PAGE_4K_SHIFT 12 7 #define PAGE_2M_SHIFT 21 8 #define PAGE_1G_SHIFT 30 9 #define PAGE_GDT_SHIFT 39 10 11 // 不同大小的页的容量 12 #define PAGE_4K_SIZE (1UL << PAGE_4K_SHIFT) 13 #define PAGE_2M_SIZE (1UL << PAGE_2M_SHIFT) 14 #define PAGE_1G_SIZE (1UL << PAGE_1G_SHIFT) 15 16 // 屏蔽低于x的数值 17 #define PAGE_4K_MASK (~(PAGE_4K_SIZE - 1)) 18 #define PAGE_2M_MASK (~(PAGE_2M_SIZE - 1)) 19 20 // 将addr按照x的上边界对齐 21 #define PAGE_4K_ALIGN(addr) \ 22 (((unsigned long)(addr) + PAGE_4K_SIZE - 1) & PAGE_4K_MASK) 23 #define PAGE_2M_ALIGN(addr) \ 24 (((unsigned long)(addr) + PAGE_2M_SIZE - 1) & PAGE_2M_MASK) 25 26 // 虚拟地址与物理地址转换 27 #define virt_2_phys(addr) ((unsigned long)(addr)-PAGE_OFFSET) 28 #define phys_2_virt(addr) \ 29 ((unsigned long *)((unsigned long)(addr) + PAGE_OFFSET)) 30 31 // ===== 页面属性 ===== 32 // 页面在页表中已被映射 mapped=1 unmapped=0 33 #define PAGE_PGT_MAPPED (1 << 0) 34 35 // 内核初始化所占用的页 init-code=1 normal-code/data=0 36 #define PAGE_KERNEL_INIT (1 << 1) 37 38 // 1=设备MMIO映射的内存 0=物理内存 39 #define PAGE_DEVICE (1 << 2) 40 41 // 内核层页 kernel=1 memory=0 42 #define PAGE_KERNEL (1 << 3) 43 44 // 共享的页 shared=1 single-use=0 45 #define PAGE_SHARED (1 << 4) 46 47 // =========== 页表项权限 ======== 48 49 // bit 63 Execution Disable: 50 #define PAGE_XD (1UL << 63) 51 52 // bit 12 Page Attribute Table 53 #define PAGE_PAT (1UL << 12) 54 // 对于PTE而言，第7位是PAT 55 #define PAGE_4K_PAT (1UL << 7) 56 57 // bit 8 Global Page:1,global;0,part 58 #define PAGE_GLOBAL (1UL << 8) 59 60 // bit 7 Page Size:1,big page;0,small page; 61 #define PAGE_PS (1UL << 7) 62 63 // bit 6 Dirty:1,dirty;0,clean; 64 #define PAGE_DIRTY (1UL << 6) 65 66 // bit 5 Accessed:1,visited;0,unvisited; 67 #define PAGE_ACCESSED (1UL << 5) 68 69 // bit 4 Page Level Cache Disable 70 #define PAGE_PCD (1UL << 4) 71 72 // bit 3 Page Level Write Through 73 #define PAGE_PWT (1UL << 3) 74 75 // bit 2 User Supervisor:1,user and supervisor;0,supervisor; 76 #define PAGE_U_S (1UL << 2) 77 78 // bit 1 Read Write:1,read and write;0,read; 79 #define PAGE_R_W (1UL << 1) 80 81 // bit 0 Present:1,present;0,no present; 82 #define PAGE_PRESENT (1UL << 0) 83 84 // 1,0 85 #define PAGE_KERNEL_PGT (PAGE_R_W | PAGE_PRESENT) 86 87 // 1,0 88 #define PAGE_KERNEL_DIR (PAGE_R_W | PAGE_PRESENT) 89 90 // 1,0 (4级页表在3级页表中的页表项的属性) 91 #define PAGE_KERNEL_PDE (PAGE_R_W | PAGE_PRESENT) 92 93 // 7,1,0 94 #define PAGE_KERNEL_PAGE (PAGE_PS | PAGE_R_W | PAGE_PRESENT) 95 96 #define PAGE_KERNEL_4K_PAGE (PAGE_R_W | PAGE_PRESENT) 97 98 #define PAGE_USER_PGT (PAGE_U_S | PAGE_R_W | PAGE_PRESENT) 99 100 // 2,1,0 101 #define PAGE_USER_DIR (PAGE_U_S | PAGE_R_W | PAGE_PRESENT) 102 103 // 1,0 (4级页表在3级页表中的页表项的属性) 104 #define PAGE_USER_PDE (PAGE_U_S | PAGE_R_W | PAGE_PRESENT) 105 // 7,2,1,0 106 #define PAGE_USER_PAGE (PAGE_PS | PAGE_U_S | PAGE_R_W | PAGE_PRESENT) 107 108 #define PAGE_USER_4K_PAGE (PAGE_U_S | PAGE_R_W | PAGE_PRESENT) 109 110 // 导出内核程序的几个段的起止地址 111 extern char _text; 112 extern char _etext; 113 extern char _data; 114 extern char _edata; 115 extern char _rodata; 116 extern char _erodata; 117 extern char _bss; 118 extern char _ebss; 119 extern char _end; 120 121 /* 122 * vm_area_struct中的vm_flags的可选值 123 * 对应的结构体请见mm-types.h 124 */ 125 #define VM_NONE 0 126 #define VM_READ (1 << 0) 127 #define VM_WRITE (1 << 1) 128 #define VM_EXEC (1 << 2) 129 #define VM_SHARED (1 << 3) 130 #define VM_IO (1 << 4) // MMIO的内存区域 131 #define VM_SOFTDIRTY (1 << 5) 132 #define VM_MAYSHARE (1 << 6) // 该vma可被共享 133 #define VM_USER (1 << 7) // 该vma可被用户态访问 134 #define VM_DONTCOPY (1 << 8) // 当fork的时候不拷贝该虚拟内存区域 135 136 /* VMA basic access permission flags */ 137 #define VM_ACCESS_FLAGS (VM_READ | VM_WRITE | VM_EXEC) 138