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new: 初步完成了mmio地址空间自动分配（未测试）

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bugfix: mmio虚拟地址分配的bug
This commit is contained in:
fslongjin
2022-08-20 01:05:15 +08:00
parent 05477932de
commit 0223232f3f
14 changed files with 317 additions and 56 deletions
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18
kernel/mm/vma.c
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@ -229,7 +229,7 @@ int __anon_vma_free(struct anon_vma_t *anon_vma)
/**
* @brief 从anon_vma的管理范围中删除指定的vma
* (在进入这个函数之前，应该要加锁)
* (在进入这个函数之前，应该要对anon_vma加锁)
* @param vma 将要取消对应的anon_vma管理的vma结构体
* @return int 返回码
*/
@ -240,16 +240,20 @@ int __anon_vma_del(struct vm_area_struct *vma)
return -EINVAL;
list_del(&vma->anon_vma_list);
semaphore_down(&vma->anon_vma->sem);
atomic_dec(&vma->anon_vma->ref_count);
// 若当前anon_vma的引用计数归零，则意味着可以释放内存页
if (unlikely(atomic_read(&vma->anon_vma->ref_count) == 0)) // 应当释放该anon_vma
{
// 若页面结构体是mmio创建的，则释放页面结构体
if (vma->anon_vma->page->attr & PAGE_DEVICE)
kfree(vma->anon_vma->page);
else
free_pages(vma->anon_vma->page, 1);
__anon_vma_free(vma->anon_vma);
// 释放了anon_vma之后，清理当前vma的关联数据
vma->anon_vma = NULL;
list_init(&vma->anon_vma_list);
}
else
semaphore_up(&vma->anon_vma->sem);
// 清理当前vma的关联数据
vma->anon_vma = NULL;
list_init(&vma->anon_vma_list);
}