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Exokernel is one of the major sources for container and library OS techniques.

Emacs Lisp 0.02% Assembly 3.58% C 41.66% Perl 0.36% Shell 1.80% Objective-C 0.40% Python 0.55% Makefile 0.98% HTML 36.73% Roff 13.92%

kernel mit driver unix-like programming filesystem

-libraryos-exokernel_implementation's Introduction

Exokernel_Implementation

I love OS. I implement it.

According to the design principles from MIT's Exokernel, one of library OSes, I implemented this OS from scratch.

I devised essential OS modules such as booting, Memory management, User-level environments, Preemptive multitasking and a sehll.

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utsav2601 ligenjian007 wanglfcs ldfaiztt richagangwar prasadv90 johnhaxx7 antonulasevich rahulroshan96 sebanfica seth1002 praveenmunagapati snowelf amigomcu

-libraryos-exokernel_implementation's Issues

about check if there is enough memory for allocation in boot_alloc()

Thanks for your blog, it helped me a lot for understanding 6.828.
I find that in pmaps.c line 128 , you initialize nAvailPages with the value of npages ( the amout of physical memory) .
In my opinion, at boot_alloc() , the memory should be allocated between KERNBASE and KERNBASE+4MB, shows in entrypgdir.c, so for checking if the kernel is out of memory or not, we shoud do the following :

uintptr_t va_end = (uintptr_t) ROUNDUP((char*) ((uintptr_t) nextfree + (uintptr_t) n), PGSIZE);
if (va_end > (uintptr_t)KERNBASE  && 
     va_end < (uintptr_t)KERNBASE + 0x400000) {
     nextfree = (char *) va_end;
}

sorry for my english.

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