DW_README

The file containing my code is DW_kernel.asm

Here's the breakdown of what I added to the kernel to implement Kernel_Size and to get the stack and heap set up to play nicely with paging:

I added statics Ker_size and Ker_b. Make sure those get copied over when you implement my code.

I added new code that falls in the block from label __start to label null_ih. To implement my code, you can simply paste over the old kernel code between those labels the code in DW_kernel.asm between those labels. This code does the following:

Determines how many pages are necessary for kernel code.

Adds 5 to this number to give the kernel 5 pages for heap and stack, and sets this as a static value to be returned by Kernel_Size.

Initializes the stack to the limit of the kernel pagespace (so it's at the end of the final page of kernel space).

Initializes the heap to the base of kernel heap pagespace (that is, the base of the page following the last page of kernel code).

Makes sure all heap allocations are made in accordance with the above change.

Makes a function Kernel_Size that returns the number of pages to allocate for the kernel. Read my .asm code for this function for the specifics on how to call it (although I assume they are consistent with how K code works, I've never used K code). Kernel code should be able to access kernel size just by directly accessing the static Ker_size, but the function can be used if for some reason necessary.

Let me know if you have any questions!

--Daniel Webber