CODEWITHSUNDEEP
kernelmallocxv6
Dani
Dani

Reputation: 799

Dynamic memory allocation in XV6 kernel

I want to implement a Queue struct (using Node struct, similiral to the C code here) in files Queue.c and Queue.h in order to store processes in proc.c in XV6 kernel.

I don't know how to to do it, since it requires to use malloc, but I can't use it inside methods which I call from the kernel.

What can I use instead, in order to implement and use the Queue?

Upvotes: 1

Views: 3869

Answers (1)

Jet Blue
Jet Blue

Reputation: 5291

You will probably have to implement something similar to the user malloc code (user/malloc.c), for the kernel. For example, look at the file kernel/string.c. It's contents are very similar to user/ulib.c. In this way, the kernel and user space have their own versions of functions like memset.

The code from user/umalloc.c cannot just be copied and pasted into a kernel version. You'll have to make tweaks for it to work in kernel space. For example changing how morecore grows the space managed by the allocator...

Upvotes: 1

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