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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.
38 lines
666 B
Markdown
38 lines
666 B
Markdown
## Name
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pmemdump - dump physical memory
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## Synopsis
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```**sh
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$ pmemdump [-r] <offset> <length>
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```
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## Description
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Dump a portion of the physical memory space.
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## Options
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* `-r`: Dump from /dev/mem with `read(2)` instead of doing `mmap(2)` on it.
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## Examples
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```sh
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$ pmemdump -r 983040 65536
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$ pmemdump 983040 65536
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```
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## Notes
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The pmemdump utility opens the `/dev/mem` file, and gets a mapping by doing `mmap(2)`
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on it.
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Using the `-r` flag might be useful sometimes, especially when reading from an unaligned
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reserved physical memory region when trying to `mmap(2)` `/dev/mem` on the specified
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offset fails.
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## See also
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* [`mem`(4)](../man4/mem.md)
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