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# pmap.9

`pmap` — 虚拟内存子系统的机器相关部分

## 名称

`pmap`

## 概要

```c
#include <sys/param.h>
```

```c
#include <vm/vm.h>
```

```c
#include <vm/pmap.h>
```

## 描述

`pmap` 模块是 FreeBSD VM（虚拟内存）子系统的机器相关部分。此处记录的每个函数都必须有自己的架构相关实现。

`pmap` 模块负责管理硬件相关对象，如页表、地址映射、TLB 等。

机器相关代码必须提供头文件

```c
#include <machine/pmap.h>
```

此文件包含 `pmap` 结构的定义：

```c
struct pmap {
        /* 内容由 pmap 实现定义。 */
};
typedef struct pmap *pmap_t;
```

此头文件还可以定义 `pmap` 实现使用的其他数据结构。

头文件

```c
#include <vm/pmap.h>
```

定义了用于跟踪 `pmap` 统计信息的结构（见下文）。此结构定义为：

```c
struct pmap_statistics {
        long        resident_count; /* 已映射页面的数量 */
        long        wired_count;    /* 已固定页面的数量 */
};
```

实现的 `struct pmap` 必须包含一个名为 `pm_stats` 的此结构实例，并且必须在每次相关 `pmap` 操作后由实现更新。

## 参见

[pmap\_activate(9)](/man/man9/pmap_activate.9.md), [pmap\_clear\_modify(9)](/man/man9/pmap_clear_modify.9.md), [pmap\_copy(9)](/man/man9/pmap_copy.9.md), pmap\_copy\_page(9), [pmap\_enter(9)](/man/man9/pmap_enter.9.md), [pmap\_extract(9)](/man/man9/pmap_extract.9.md), pmap\_extract\_and\_hold(9), [pmap\_growkernel(9)](/man/man9/pmap_growkernel.9.md), [pmap\_init(9)](/man/man9/pmap_init.9.md), [pmap\_is\_modified(9)](/man/man9/pmap_is_modified.9.md), [pmap\_is\_prefaultable(9)](/man/man9/pmap_is_prefaultable.9.md), [pmap\_kextract(9)](/man/man9/pmap_kextract.9.md), [pmap\_map(9)](/man/man9/pmap_map.9.md), [pmap\_mincore(9)](/man/man9/pmap_mincore.9.md), [pmap\_object\_init\_pt(9)](/man/man9/pmap_object_init_pt.9.md), [pmap\_page\_exists\_quick(9)](/man/man9/pmap_page_exists_quick.9.md), [pmap\_page\_init(9)](/man/man9/pmap_page_init.9.md), [pmap\_pinit(9)](/man/man9/pmap_pinit.9.md), pmap\_pinit0(9), [pmap\_protect(9)](/man/man9/pmap_protect.9.md), [pmap\_qenter(9)](/man/man9/pmap_qenter.9.md), pmap\_qremove(9), [pmap\_quick\_enter\_page(9)](/man/man9/pmap_quick_enter_page.9.md), pmap\_quick\_remove\_page(9), [pmap\_release(9)](/man/man9/pmap_release.9.md), [pmap\_remove(9)](/man/man9/pmap_remove.9.md), pmap\_remove\_all(9), pmap\_remove\_pages(9), [pmap\_resident\_count(9)](/man/man9/pmap_resident_count.9.md), pmap\_ts\_referenced(9), [pmap\_unwire(9)](/man/man9/pmap_unwire.9.md), pmap\_wired\_count(9), pmap\_zero\_area(9), [pmap\_zero\_page(9)](/man/man9/pmap_zero_page.9.md), [vm\_map(9)](/man/man9/vm_map.9.md)

## 作者

本手册页由 Bruce M Simpson <bms@spc.org> 编写。


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