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finish lab2 page_table.c

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This commit is contained in:
KAAAsS 2021-05-13 14:34:13 +08:00
parent 5cf26522a5
commit 5eab974821
Signed by: KAAAsS
GPG Key ID: D56625F3E671882F
1 changed files with 85 additions and 2 deletions
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87
lab2/kernel/mm/page_table.c
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@ -162,7 +162,24 @@ static int get_next_ptp(ptp_t * cur_ptp, u32 level, vaddr_t va,
int query_in_pgtbl(vaddr_t * pgtbl, vaddr_t va, paddr_t * pa, pte_t ** entry)
{
// <lab2>
ptp_t * cur_ptp = (ptp_t *) pgtbl, *next_ptp;
int page_type;
// 遍历 L0-L3
for (u32 cur_level = 0; cur_level < 4; cur_level++) {
page_type = get_next_ptp(cur_ptp, cur_level, va, &next_ptp, entry, false);
if (page_type < 0) {
// 无法映射
return page_type;
} else if (page_type == BLOCK_PTP) {
// 遇到块项直接返回
break;
} else {
// 遇到页表项，向下遍历
cur_ptp = next_ptp;
}
}
*pa = GET_PADDR_IN_PTE((*entry)) | (va & PAGE_MASK);
// </lab2>
return 0;
}
@ -186,7 +203,40 @@ int map_range_in_pgtbl(vaddr_t * pgtbl, vaddr_t va, paddr_t pa,
size_t len, vmr_prop_t flags)
{
// <lab2>
vaddr_t va_start = va, va_end = va + len, va_cur;
ptp_t * cur_ptp, *next_ptp;
int page_type;
u32 cur_level;
pte_t *entry;
u64 cur_pfn;
// 遍历所有页
cur_pfn = pa >> PAGE_SHIFT;
va_start &= ~PAGE_MASK;
va_end &= ~PAGE_MASK;
if (va_end < va + len) {
va_end++; // 有不完整的一页
}
for (va_cur = va_start; va_cur < va_end; va_cur += PAGE_SIZE) {
// 创建一页
cur_ptp = (ptp_t *) pgtbl;
for (cur_level = 0; cur_level < 4; cur_level++) {
page_type = get_next_ptp(cur_ptp, cur_level, va, &next_ptp, &entry, true);
if (page_type < 0) {
// 无法映射
return page_type;
} else if (page_type == BLOCK_PTP) {
// 目前只支持页映射，遇到块项直接返回
return -ENOMAPPING;
} else {
// 遇到页表项，向下遍历
cur_ptp = next_ptp;
}
}
// 配置页
set_pte_flags(entry, flags, USER_PTE);
entry->l3_page.pfn = cur_pfn++;
}
flush_tlb();
// </lab2>
return 0;
}
@ -207,7 +257,40 @@ int map_range_in_pgtbl(vaddr_t * pgtbl, vaddr_t va, paddr_t pa,
int unmap_range_in_pgtbl(vaddr_t * pgtbl, vaddr_t va, size_t len)
{
// <lab2>
vaddr_t va_start = va, va_end = va + len, va_cur;
ptp_t * cur_ptp, *next_ptp;
int page_type;
u32 cur_level;
pte_t *entry;
// 遍历所有页
va_start &= ~PAGE_MASK;
va_end &= ~PAGE_MASK;
if (va_end < va + len) {
va_end++; // 有不完整的一页
}
for (va_cur = va_start; va_cur < va_end; va_cur += PAGE_SIZE) {
// 创建一页
cur_ptp = (ptp_t *) pgtbl;
for (cur_level = 0; cur_level < 4; cur_level++) {
page_type = get_next_ptp(cur_ptp, cur_level, va, &next_ptp, &entry, false);
if (page_type < 0) {
// 无法映射
break;
} else if (page_type == BLOCK_PTP) {
// 目前只支持页映射，遇到块项直接返回
return -ENOMAPPING;
} else {
// 遇到页表项，向下遍历
cur_ptp = next_ptp;
}
}
if (cur_level != 4) {
continue;
}
// 配置页
entry->pte = 0;
}
flush_tlb();
// </lab2>
return 0;
}