kernel-dev/include/kernel/arch/x86_64/memm.h

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#ifndef X86_64_MEMM_H
#define X86_64_MEMM_H 1
#include <types.h>
#include <libk/bits.h>
/* 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