Linking with kernel code (Makefile)
The character device is a good idea!!!
But how would the device's mmap be implemented?
I know how the read and write work, but they copy the data from one space to another, which would be slow if there is much communication. Because this looses the benifits of shared memory
About the kernel linking, I'm not making a module driver, I'm trying to recompile the kernel after adding my file (kshared.c) I guess I should be able to access all structures and functions in the kernel, if I succeed to link correctly with the files containing those functions and structures, but I'm not so good at make files.
Quoted 20 lines · --- "Albert D. Cahalan
Quoted 2 lines
What I want to do:
create a shared memory segment between user space and kernel spaceCreate a character device.
Have the driver allocate memory.
Let the usermmap()it.Quoted 1 line
I can't link with the array or the function, this also happens
with
Quoted 2 lines
all functions that are not defined in 'ksyms'
Even though I declared 'newseg' and 'shm_segs' as 'extern' in myfile
...Quoted 1 line
But while making bzImage, it gives the error unresolved external
'newseg'
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So my question is how can I link to the kernel source code, or am I
not
Quoted 1 line
allowed to?
Quoted 8 lines
You are not allowed to use interfaces that are not exported. This is partly to prevent you from depending on code that is very likely to change, and partly to prevent a Microsoft Linux or similar abuse of the GPL.
If you really need it, make a non-module driver. Maybe after that gets accepted into the main kernel you could convince Linus to export the function you want for module use.
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