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🐛 修复了物理页分配时，起始页号计算错误的问题

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fslongjin 2022-02-10 14:01:43 +08:00
parent 67633eb04e
commit 26c23e0e65
1 changed files with 1 additions and 1 deletions
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2
kernel/mm/mm.c
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@ -300,7 +300,7 @@ struct Page *alloc_pages(unsigned int zone_select, int num, ul flags)
// 寻找连续num个空页 // 寻找连续num个空页
if (!(((*p >> k) | (*(p + 1) << (64 - k))) & (num == 64 ? 0xffffffffffffffffUL : ((1UL << num) - 1)))) if (!(((*p >> k) | (*(p + 1) << (64 - k))) & (num == 64 ? 0xffffffffffffffffUL : ((1UL << num) - 1))))
{ {
ul start_page_num = j + k - 1; // 计算得到要开始获取的内存页的页号（书上的公式有问题，这个是改过之后的版本） ul start_page_num = j + k - shift; // 计算得到要开始获取的内存页的页号（书上的公式有问题，这个是改过之后的版本）
for (ul l = 0; l < num; ++l) for (ul l = 0; l < num; ++l)
{ {
struct Page *x = memory_management_struct.pages_struct + start_page_num + l; struct Page *x = memory_management_struct.pages_struct + start_page_num + l;