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https://www.ibm.com/support/knowledgecenter/en/ssw_aix_72/filesreference/mem.html
The kmem special file provides access to the virtual memory address space for the current process, as it is seen by the kernel. The seek offset, set by the lseek subroutine, is used to specify the virtual address targeted for the read or write. The kmem pseudo-device driver only supports the open, close, read, readx, writex, and write subroutines.
http://lkml.iu.edu/hypermail/linux/kernel/1203.3/02348.html
@@ -6,6 +6,16 @@ menu "Character devices" source "drivers/tty/Kconfig" +config DEVMEM + bool "/dev/mem virtual device support" + default y + help + Say Y here if you want to support the /dev/mem device. + Some X server drivers access the video hardware using this device. + Accessing hardware directly from user space can be useful in some
https://stackoverflow.com/questions/10800884/how-to-use-dev-kmem
For the invalid argument in case 1, the problem is offset being non-page aligned. mmap(2) works by manipulating page tables, and such works only on multiplies of page-size for both size and offset As for the second case, I'm not sure if you're guaranteed to have kernel space begin at 3G boundary.
https://github.com/torvalds/linux/blob/master/drivers/char/Kconfig
Jul 15, 2019 · Say Y here if you want to support the /dev/mem device. The /dev/mem device is used to access areas of physical: memory. When in doubt, say "Y". config DEVKMEM: bool "/dev/kmem virtual device support" # On arm64, VMALLOC_START < PAGE_OFFSET, which confuses kmem read/write: depends on !ARM64: help: Say Y here if you want to support the /dev/kmem ...
https://www.kernel.org/doc/html/latest/trace/events-kmem.html
Subsystem Trace Points: kmem¶. The kmem tracing system captures events related to object and page allocation within the kernel. Broadly speaking there are five major subheadings.
https://www.quora.com/What-is-the-difference-between-dev-mem-and-dev-kmem
[code]/dev/mem[/code] is a device file that directly represents physical memory, so an [code]open(/dev/mem)[/code]/[code]seek(1000)[/code]/[code]read(10)[/code ...
http://man7.org/linux/man-pages/man4/mem.4.html
MEM(4) Linux Programmer's Manual MEM(4) NAME top mem, kmem, port - system memory, kernel memory and system ports DESCRIPTION top /dev/mem is a character device file that is an image of the main memory of the computer. It may be used, for example, to examine (and even patch) the system.
https://lkml.org/lkml/2012/3/29/357
Mar 29, 2012 · + Say Y here if you want to support the /dev/mem device. + Some X server drivers access the video hardware using this device. + Accessing hardware directly from user space can be useful in some + cases, but it is not without risks. + When in doubt, say "N". + config DEVKMEM bool "/dev/kmem virtual device support" default y
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