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https://stackoverflow.com/questions/38316121/mmap-a-device-and-access-it-devices-memory-map
Some drivers support this, but most don't. If the device does support this, then we do the mmap with fdd. If it doesn't we have to do fdm = open("/dev/mem",O_RDWR) and pass fdm to mmap. Of course, now the mmap offset parameter will be radically different.
http://www.xml.com/ldd/chapter/book/ch13.html
As you might suspect, not every device lends itself to the mmap abstraction; it makes no sense, for instance, for serial ports and other stream-oriented devices. Another limitation of mmap is that mapping is PAGE_SIZE grained.
https://developer.blackberry.com/native/reference/core/com.qnx.doc.neutrino.lib_ref/topic/m/mmap_device_io.html
The mmap_device_io() function maps len bytes of device I/O memory at io and makes it accessible via the in*() and out*() functions in <hw/inout.h>. In order to map physical memory, your process must have the PROCMGR_AID_MEM_PHYS ability enabled.
https://www.sqlite.org/mmap.html
To activate memory-mapped I/O, use the mmap_size pragma and set the mmap_size to some large number, usually 256MB or larger, depending on how much address space your application can spare. The rest is automatic. The PRAGMA mmap_size statement will be a silent no-op on systems that do not support memory-mapped I/O.
https://www.gnu.org/software/libc/manual/html_node/Memory_002dmapped-I_002fO.html
Not all file descriptors may be mapped. Sockets, pipes, and most devices only allow sequential access and do not fit into the mapping abstraction. In addition, some regular files may not be mmapable, and older kernels may not support mapping at all. Thus, programs using mmap should have a fallback
https://forum.lumion.com/general-discussion/error-devicedriver-does-not-support-hardware-shadow-maps/
Sep 19, 2014 · IMPORTANT: Please do not send private messages and emails to members of staff - unless we specifically ask you to send us sensitive information, for example License Keys.
https://www.kernel.org/doc/html/latest/driver-api/uio-howto.html
The logic of controlling the device does not necessarily have to be within the kernel, as the device does not need to take advantage of any of other resources that the kernel provides. One such common class of devices that are like this are for industrial I/O cards.
https://labs.f-secure.com/assets/BlogFiles/mwri-mmap-exploitation-whitepaper-2017-09-18.pdf
The code above calls mmap on the ‘/dev/MWR_DEVICE’ driver file with size equal to 0x1000, file offset set to 0x1000 and a destination address set to ‘0x42424000’. A successful mapping result can be seen below: # cat /proc/23058/maps 42424000-42425000 rw-s 00001000 00:06 68639 /dev/MWR_DEVICE 2.2 Empty mmap Handler
https://stackoverflow.com/questions/11197680/does-a-kernel-driver-implementing-mmap-have-to-create-a-character-device
@Joshua, I cannot say if mmap() can be used without any file, but creating exactly a character device is not necessary. In my project, I create a file in debugfs, which is easier, and use that to be able to mmap a buffer in the kernel space to the user space and pass data through it.
https://www.easeus.com/storage-media-recovery/external-hard-drive-not-initialized.html
Aug 11, 2019 · Step 2. Scan for lost data. The software will start immediately to scan all over the selected drive for all lost data. During the scan, you could see more and more data showing up in the results.
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