shithub: drawcpu

ref: 8d93ccdbb2a2dee8d2eb1387da1b316fdf84b208
dir: /main.c/

#include "u.h"
#include "lib.h"
#include "kern/dat.h"
#include "kern/fns.h"
#include "user.h"
#include "drawcpu.h"
#include "arg.h"
#include "proc.h"

char *argv0;
int debug;

void
sizebug(void)
{
	/*
	 * Needed by various parts of the code.
	 * This is a huge bug.
	 */
	assert(sizeof(char)==1);
	assert(sizeof(short)==2);
	assert(sizeof(ushort)==2);
	assert(sizeof(int)==4);
	assert(sizeof(uint)==4);
	assert(sizeof(long)==4);
	assert(sizeof(ulong)==4);
	assert(sizeof(vlong)==8);
	assert(sizeof(uvlong)==8);
}

// TODO: remove libgui, or at least revamp as cpubody goes away
void cpubody(void) {}

char*
estrdup(char *s)
{
	s = strdup(s);
	if(s == nil)
		sysfatal("out of memory");
    return s;
}


static void
usage(void)
{
	fprintf(stderr, "usage: drawcpu [-p 9bin]\n");
	exit(1);
}

int
notehandler(void *, char *note)
{
	if(strncmp(note, "sys:", 4) == 0)
		return 0;
	
	if(strncmp(note, "emu:", 4) == 0)
		exits(note);

	addnote(note);
	return 1;
}

int
main(int argc, char **argv)
{
	extern ulong kerndate;
	char *path, *file;

	path = nil;
	kerndate = seconds();
	eve = getuser();
	if(eve == nil)
		eve = "drawcpu";

	ARGBEGIN {
	case 'p':
		path = EARGF(usage());
		break;
	default:
		usage();
	} ARGEND;

	sizebug();
	osinit();
	procinit0();
	printinit();

	chandevreset();
	chandevinit();
	quotefmtinstall();

	if(bind("#c", "/dev", MBEFORE) < 0)
		panic("bind #c: %r");
	if(bind("#e", "/env", MREPL|MCREATE) < 0)
		panic("bind #e: %r");
	if(bind("#I", "/net", MBEFORE) < 0)
		panic("bind #I: %r");
	if(bind("#U", "/root", MREPL|MCREATE) < 0)
		panic("bind #U: %r");
	bind("#C", "/", MAFTER);
	//bind("#P", "/proc", MBEFORE);

	if(bind("/root", "/", MAFTER) < 0)
		panic("bind /root: %r");

	//if(bind("/dev/fd", "/fd", MAFTER) < 0)
	//	panic("bind /fd: %r");

	if(path != nil)
		bind(path, "/bin", MAFTER);

	if(**argv == '/' || **argv == '.' || **argv == '#') {
		// TODO: Export loadtext from the kernel
		if(loadtext(*argv, argc, argv) < 0)
			sysfatal("loadtext: %r");
		return;
	}
	file = smprint("/bin/%s", *argv);
	if(loadtext(file, argc, argv) < 0)
		sysfatal("loadtext: %r");
	free(file);

	// TODO: Export step() from the kernel
	atnotify(notehandler, 1);
	for(;;) {
		// Kernel step, while this greys kernelspace/userspace this is the cleaner approach
		step();
		while((up->notein - up->noteout) % NNOTE) {
			donote(up->notes[up->noteout % NNOTE], 0);
			ainc(&up->noteout);
		}
	}
}