shithub: nix

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rethinking nix.
our original model was that there were ac's and tc's and ac's ran a very simple "kernel".
but the cpu model for that does not really exist.
It may be just as cheap/better to have a device that drops you into a
'lightweight' mode that disables all interrupts or swaps the idt for a lightweight
one and takes it from there. So it's time to take a pause and think about things.

--- a/sys/src/nix/pc64/acore.c

+++ b/sys/src/nix/pc64/acore.c

@@ -237,7 +237,7 @@

 	}

 Post:

 	nix->icc->rc = ICCTRAP;

-	//m->cr2 = getcr2();

+	nix->cr2 = getcr2();

 	memmove(m->proc->dbgreg, u, sizeof *u);

 	nix->icc->note = n;

 #ifdef ZERO

@@ -247,11 +247,12 @@

 	mfence();

 	nix->icc->fn = nil;

 	ready(m->proc);

-

+	print("proc ready\n");

 	//mwait(&m->icc->fn);

+	print("waiting on fn\n");

 	while(! nix->icc->fn)

 		;

-

+	print("fn back\n");

 	if(nix->icc->flushtlb)

 		acmmuswitch();

 	if(nix->icc->fn != actrapret)

--- a/sys/src/nix/pc64/nix.h

+++ b/sys/src/nix/pc64/nix.h

@@ -16,6 +16,7 @@

 	uvlong nicc;

 	int apicno; // not sure we need this? 

 	int online; // TODO: what is this really? };

+	uvlong cr2;

 };

 /*