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