#ifndef X86_64_MEMM_H #define X86_64_MEMM_H 1 #include #include /* 页大小，以MEMM_PAGE_SIZE为单位 */ #define MEMM_PAGE_SIZE 4096 typedef enum __memm_page_size { MEMM_PAGE_SIZE_4K = 1, // 1个4KB页大小 MEMM_PAGE_SIZE_2M = 512, // 512个4KB页大小 MEMM_PAGE_SIZE_1G = 262144, // 262144个4KB页大小 } memm_page_size; extern u64 PML4[512]; #define MEMM_PAGE_TABLE_FLAGS_MASK ((u64)0xfff) /* 页对齐掩码 */ #define MEMM_4K_ALIGN_MASK ((u64)0xfff) #define MEMM_2M_ALIGN_MASK ((u64)0x1fffff) #define MEMM_1G_ALIGN_MASK ((u64)0x3fffffff) /* 页表项属性FLAGS */ #define MEMM_ENTRY_FLAG_PRESENT ((u64)1) #define MEMM_ENTRY_FLAG_WRITE ((u64)1 << 1) #define MEMM_ENTRY_FLAG_USER ((u64)1 << 2) #define MEMM_ENTRY_FLAG_PWT ((u64)1 << 3) #define MEMM_ENTRY_FLAG_PCD ((u64)1 << 4) #define MEMM_ENTRY_FLAG_ACCECED ((u64)1 << 5) #define MEMM_ENTRY_FLAG_DIRTY ((u64)1 << 6) #define MEMM_ENTRY_FLAG_PS ((u64)1 << 7) #define MEMM_ENTRY_FLAG_GLOBAL ((u64)1 << 8) #define MEMM_ENTRY_FLAG_PAT ((u64)1 << 12) #define MEMM_PTE_ENTRY_FLAG_PAT ((u64)1 << 7) #define MEMM_ENTRY_FLAG_XD ((u64)1 << 63) #define memm_entry_flag_get(entry, flag) \ ((entry & flag) ? true : false) /* 页表（大型页）项地址域掩码 */ #define MEMM_ENTRY_ADDRESS_MASK ((u64)0x000ffffffffff000) #define MEMM_BP_ENTRY_ADDRESS_MASK ((u64)0x000fffffffffe000) #define memm_entry_get_address(entry) \ ((entry) & (memm_entry_flag_get(entry, MEMM_ENTRY_FLAG_PS) \ ? MEMM_BP_ENTRY_ADDRESS_MASK \ : MEMM_ENTRY_ADDRESS_MASK)) /* 线性地址表项索引或页内偏移掩码 */ #define MEMM_LA_PML4EI_MASK ((u64)0x0000ff8000000000) #define MEMM_LA_PDPTEI_MASK ((u64)0x0000007fc0000000) #define MEMM_LA_PDEI_MASK ((u64)0x000000003fe00000) #define MEMM_LA_PEI_MASK ((u64)0x00000000001ff000) #define MEMM_LA_1GB_PAGE_OFFSET_MASK ((u64)0x000000003fffffff) #define MEMM_LA_2MB_PAGE_OFFSET_MASK ((u64)0x00000000001fffff) #define MEMM_LA_4KB_PAGE_OFFSET_MASK ((u64)0x0000000000000fff) /* 线性地址表项索引偏移位数 */ #define MEMM_LA_PML4EI_OFFSET (39) #define MEMM_LA_PDPTEI_OFFSET (30) #define MEMM_LA_PDEI_OFFSET (21) #define MEMM_LA_PEI_OFFSET (12) /* 获取线性地址中某个表项索引以及获取页内偏移 */ #define MEMM_LA_PML4EI #define MEMM_LA_PDPTEI #define MEMM_LA_PDEI #define MEMM_LA_PEI #define memm_la_get_entry_index(addr, entry) \ (((addr) & (entry##_MASK)) >> (entry##_OFFSET)) #define MEMM_LA_1GB_PAGE_OFFSET #define MEMM_LA_2MB_PAGE_OFFSET #define MEMM_LA_4KB_PAGE_OFFSET #define memm_la_get_offset(addr, page_type) \ ((addr) & (page_type##_MASK)) /* 仅支持canonical型地址 target与physical至少都是以MEMM_PAGE_SIZE对齐的 没有MEMM_PAGE_SIZE对齐的，和非canonical型地址都会返回false 当剩余长度超过1GB的一半且地址1GB对齐，则会映射一个1GB页； 当剩余长度超过2MB的一半且地址2MB对齐，则会映射一个2MB页； 否则映射4KB页。 */ bool memm_map_pageframes_to( u64 target, u64 physical, usize size, bool user, bool write); extern void reload_pml4(); #define is_user_address(addr) \ (((addr) > 0xffff7fffffffffff) ? true : false) #define is_cannonical(addr) \ (((addr) < 0x0000800000000000 || (addr) > 0xffff7fffffffffff) ? true : false) #define memm_get_page_align(addr) \ (is_aligned(addr, MEMM_PAGE_SIZE_1G) \ ? MEMM_PAGE_SIZE_1G \ : (is_aligned(addr, MEMM_PAGE_SIZE_2M) \ ? MEMM_PAGE_SIZE_2M \ : MEMM_PAGE_SIZE_4K)) #endif