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再次修正页表 bug

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KAAAsS 2021-05-23 20:25:50 +08:00
parent 0c7b007570
commit 1be2b1fcdf
Signed by: KAAAsS
GPG Key ID: D56625F3E671882F
1 changed files with 16 additions and 6 deletions
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18
lab5/kernel/mm/page_table.c
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@ -217,9 +217,9 @@ int map_range_in_pgtbl(vaddr_t * pgtbl, vaddr_t va, paddr_t pa,
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
// 搜寻前 N 页
cur_ptp = (ptp_t *) pgtbl;
for (cur_level = 0; cur_level < 4; cur_level++) {
for (cur_level = 0; cur_level < 3; cur_level++) {
page_type = get_next_ptp(cur_ptp, cur_level, va_cur, &next_ptp, &entry, true);
if (page_type < 0) {
// 无法映射
@ -232,9 +232,19 @@ int map_range_in_pgtbl(vaddr_t * pgtbl, vaddr_t va, paddr_t pa,
cur_ptp = next_ptp;
}
}
// 三级页检查占用
page_type = get_next_ptp(cur_ptp, 3, va_cur, &next_ptp, &entry, false);
if (page_type == -ENOMAPPING) {
// 配置页
set_pte_flags(entry, flags, USER_PTE);
entry = &(cur_ptp->ent[GET_L3_INDEX(va_cur)]);
entry->pte = 0;
entry->l3_page.is_valid = 1;
entry->l3_page.is_page = 1;
entry->l3_page.pfn = cur_pfn++;
set_pte_flags(entry, flags, USER_PTE);
} else {
BUG("Page already mapped");
}
}
flush_tlb();
// </lab2>
@ -272,7 +282,7 @@ int unmap_range_in_pgtbl(vaddr_t * pgtbl, vaddr_t va, size_t len)
// 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);
page_type = get_next_ptp(cur_ptp, cur_level, va_cur, &next_ptp, &entry, false);
if (page_type < 0) {
// 无法映射
break;