分配初始化零页

Posted 2020-12-30 yangjiguang

1.从bootmem分配一页

/*这里zero_page指向虚拟地址*/
void *zero_page = alloc_bootmem_low_pages(PAGE_SIZE);

2.找出zero_page对应的页框描述符page结构体

struct page * empty_zero_page = virt_to_page(zero_page);

3.flush_dcache_page(empty_zero_page);