ladybird/Base/usr/share/man/man1/pmemdump.md

## Name

pmemdump - dump physical memory

## Synopsis

```**sh
$ pmemdump [-r] <offset> <length>
```

## Description

Dump a portion of the physical memory space.


## Options

* `-r`: Dump from /dev/mem with `read(2)` instead of doing `mmap(2)` on it.

## Examples

```sh
$ pmemdump -r 983040 65536 
$ pmemdump 983040 65536 
```

## Notes

The pmemdump utility opens the `/dev/mem` file, and gets a mapping by doing `mmap(2)`
on it.

Using the `-r` flag might be useful sometimes, especially when reading from an unaligned
reserved physical memory region when trying to `mmap(2)` `/dev/mem` on the specified
offset fails.

## See also

* [`mem`(4)](help://man/4/mem)
Userland: Introduce the pmemdump utility This utility helps to dump the physical memory space from /dev/mem. It supports both read(2) and mmap(2) on it so we could use mmap(2) for fast dumping of the memory, or read(2) when we need to read unaligned physical regions. 2021-12-24 07:04:34 +02:00			`## Name`

			`pmemdump - dump physical memory`

			`## Synopsis`

			```**sh
			`$ pmemdump [-r] <offset> <length>`
			```

			`## Description`

			`Dump a portion of the physical memory space.`


			`## Options`

			* `-r`: Dump from /dev/mem with `read(2)` instead of doing `mmap(2)` on it.

			`## Examples`

			```sh
			`$ pmemdump -r 983040 65536`
			`$ pmemdump 983040 65536`
			```

			`## Notes`

			The pmemdump utility opens the `/dev/mem` file, and gets a mapping by doing `mmap(2)`
			`on it.`

			Using the `-r` flag might be useful sometimes, especially when reading from an unaligned
			reserved physical memory region when trying to `mmap(2)` `/dev/mem` on the specified
			`offset fails.`

			`## See also`

markdown-check: Check that no old-style inter-manpage links are used We've had quite some instances of people reintroducing these kinds of links because they didn't know about the "new" help:// scheme. This check should now prevent that from happening, though it might in rare circumstances trigger a false positive. 2023-01-07 17:05:33 +01:00			* [`mem`(4)](help://man/4/mem)