initial cut at sys structure for pc.  it's done in an ugly way, and
we're not using the stack and mach0 that we say we are, but at
least all the pieces are in the right place.  give up on different
ticks for different machines.  we don't have a light panel for
each processor.  :-)

Reference: /n/atom/patch/applied2013/fspcsys
Date: Tue Aug 27 15:28:28 CES 2013
Signed-off-by: quanstro@quanstro.net

--- /sys/src/fs/pc/l.s	Tue Aug 27 15:27:22 2013
+++ /sys/src/fs/pc/l.s	Tue Aug 27 15:27:23 2013
@@ -86,6 +86,7 @@
 	MOVL	$0,0(SP)
 	ADDL	$(MACHSIZE-4),SP	/* start stack under machine struct */
 	MOVL	$0, u(SB)
+	MOVL	$sys0(SB),sys(SB)
 
 	/*
 	 *  clear flags
@@ -102,7 +103,9 @@
 GLOBL	mach0+0(SB), $MACHSIZE
 GLOBL	u(SB), $4
 GLOBL	m(SB), $4
+GLOBL	sys(SB), $4
 GLOBL	tpt(SB), $(BY2PG*3)
+GLOBL	sys0(SB), $(MACHSTKSZ+MACHSZ+4*KiB+4*KiB+8*KiB)
 
 /*
  *  gdt to get us to 32-bit/segmented/unpaged mode
@@ -548,9 +551,10 @@
 	POPFL
 	RET
 
-TEXT	getstatus(SB),$0
+TEXT	islo(SB),$0
 	PUSHFL
 	POPL	AX
+	ANDL	$IFLAG, AX
 	RET
 
 TEXT _cycles(SB), $0				/* time stamp counter; cycles since power up */
--- /sys/src/fs/pc/archdat.h	Tue Aug 27 15:27:24 2013
+++ /sys/src/fs/pc/archdat.h	Tue Aug 27 15:27:24 2013
@@ -13,6 +13,7 @@
 typedef		u32int	Mpl;
 typedef	struct	Pcidev	Pcidev;
 typedef	struct	Segdesc	Segdesc;
+typedef	struct	Sys	Sys;
 typedef		ulong	uintmem;
 
 #pragma incomplete Pcidev
@@ -47,7 +48,7 @@
 struct	Mach
 {
 	int	machno;		/* physical id of processor */
-	long	ticks;		/* of the clock since boot time */
+//	long	ticks;		/* of the clock since boot time */
 	int	lights;		/* light lights, this processor */
 	Filter	idle;
 
@@ -88,11 +89,35 @@
 	ulong	topofmem;
 };
 
+struct Sys {
+	uchar	machstk[MACHSTKSZ];
+
+	union {
+		Mach	mach;
+		uchar	machpage[MACHSZ];
+	};
+	union {
+		struct {
+			long	ticks;		/* convert to u64int for tsc? */
+			u64int	epoch;		/* tsc synchronization */
+		};
+		uchar	syspage[4*KiB];
+	};
+	union {
+		Mach*	machptr[MACHMAX];
+		uchar	ptrpage[4*KiB];
+	};
+	uchar	pad[2][4096];
+};
+
+extern	Sys*	sys;
 extern	Mach	mach0;
 extern	Mconf	mconf;
 extern	char	nvrfile[128];
 extern	/*register*/	Mach*	m;
 extern	/*register*/	User*	u;
 
-#define	MACHP(n)	((Mach*)(MACHADDR+n*BY2PG))
-#define	Ticks		MACHP(0)->ticks
+//#define	MACHP(n)	((Mach*)(MACHADDR+n*BY2PG))
+//#define	Ticks		MACHP(0)->ticks
+#define		MACHP(n)	sys->machptr[n]
+#define		Ticks		sys->ticks
--- /sys/src/fs/pc/8253.c	Tue Aug 27 15:27:25 2013
+++ /sys/src/fs/pc/8253.c	Tue Aug 27 15:27:26 2013
@@ -168,7 +168,7 @@
 static void
 simplecycles(uvlong*x)
 {
-	*x = m->ticks;
+	*x = Ticks;
 }
 
 void	(*cycles)(uvlong*) = simplecycles;
--- /sys/src/fs/pc/ata.c	Tue Aug 27 15:27:28 2013
+++ /sys/src/fs/pc/ata.c	Tue Aug 27 15:27:30 2013
@@ -401,7 +401,7 @@
 	}
 	/* else we're in predawn with no u */
 	x = spllo();
-	for (start = m->ticks; TK2MS(Ticks - start) < msec && !fn(v); )
+	for (start = Ticks; TK2MS(Ticks - start) < msec && !fn(v); )
 		continue;
 	splx(x);
 }
--- /sys/src/fs/pc/lock.c	Tue Aug 27 15:27:30 2013
+++ /sys/src/fs/pc/lock.c	Tue Aug 27 15:27:31 2013
@@ -64,7 +64,7 @@
 	if(u)
 		dumpstack(u);
 	dotrace(0);
-	if(getstatus() & IFLAG)
+	if(islo())
 		sched();
 	else
 		print("ilock deadlock\n");
@@ -82,7 +82,7 @@
 
 	if(u && _xdec(&u->nlock) == 0)
 	if(u->delaysched)
-	if(getstatus() & IFLAG){
+	if(islo()){
 		/*
 		 * Call sched if the need arose while locks were held
 		 * But, don't do it from interrupt routines, hence the islo() test
@@ -126,7 +126,7 @@
 		while(l->sbsem)
 			;
 #else
-		if(getstatus() & IFLAG)
+		if(islo())
 			sched();
 		else
 			panic("ilock: locked & splhi\n");
@@ -155,7 +155,7 @@
 		panic("iunlock nolock: pc %#p", getcallerpc(&l));
 	if(l->isilock == 0)
 		print("iunlock lock: pc %#p held by %#p\n", getcallerpc(&l), l->pc);
-	if((getstatus()&IFLAG) != 0)
+	if(islo())
 		print("iunlock lo: %#p held by %#p\n", getcallerpc(&l), l->pc);
 
 	sr = l->sr;
--- /sys/src/fs/pc/fns.h	Tue Aug 27 15:27:32 2013
+++ /sys/src/fs/pc/fns.h	Tue Aug 27 15:27:32 2013
@@ -1,17 +1,15 @@
 #include "../port/portfns.h"
 
 void	aamloop(int);
+int	atainit(void);
 void	cgaputc(int);
 void	cgaputs(char*, int);
 void	cmd_e820(int, char**);
 void	(*coherence)(void);
 void	cpuid(char*, ulong*, ulong*);
+void	(*cycles)(uvlong*);
 void	etherinit(void);
 void	etherstart(void);
-int	floppyinit(void);
-void	floppyproc(void);
-Off	floppyread(int, void*, long, Devsize);
-Off	floppywrite(int, void*, long, Devsize);
 void	fpinit(void);
 vlong	getatapartoff(int, char*);
 char*	getconf(char*);
@@ -20,22 +18,19 @@
 ulong	getcr3(void);
 ulong	getcr4(void);
 int	getfields(char*, char**, int, int, char*);
-ulong	getstatus(void);
-int	atainit(void);
-Off	ataread(int, void*, long, Devsize);
-Off	atawrite(int, void*, long, Devsize);
 void	i8042a20(void);
 void	i8042reset(void);
 void	idle(void);
 int	inb(int);
+ulong	inl(int);
 void	insb(int, void*, int);
 ushort	ins(int);
-void	inss(int, void*, int);
-ulong	inl(int);
 void	insl(int, void*, int);
+void	inss(int, void*, int);
+int	islo(void);
+int	kbdgetc(void);
 void	kbdinit(void);
 int	kbdintr0(void);
-int	kbdgetc(void);
 ulong*	mapaddr(ulong);
 void	mb386(void);
 void	mb586(void);
@@ -44,42 +39,55 @@
 void	mmuinit(void);
 uchar	nvramread(int);
 void	outb(int, int);
+void	outl(int, ulong);
 void	outsb(int, void*, int);
 void	outs(int, ushort);
-void	outss(int, void*, int);
-void	outl(int, ulong);
 void	outsl(int, void*, int);
+void	outss(int, void*, int);
 void	printcpufreq(void);
-void	putgdt(Segdesc*, int);
-void	putidt(Segdesc*, int);
 void	putcr3(ulong);
 void	putcr4(ulong);
+void	putgdt(Segdesc*, int);
+void	putidt(Segdesc*, int);
 void	puttr(ulong);
 void	rdmsr(int, vlong*);
-void	wrmsr(int, vlong);
-void	(*cycles)(uvlong*);
-void	scsiinit(void);
-Off	scsiread(int, void*, long);
-Devsize	scsiseek(int, Devsize);
-Off	scsiwrite(int, void*, long);
-int	setatapart(int, char*);
-int	setscsipart(int, char*);
 void	setvec(int, void (*)(Ureg*, void*), void*);
-int	splhi(void);
-int	spllo(void);
-void	splx(int);
+Mpl	splhi(void);
+Mpl	spllo(void);
+void	splx(Mpl);
 int	tas(Lock*);
 void	trapinit(void);
-void	uartspecial(int, void (*)(int), int (*)(void), int);
 int	uartgetc(void);
 void	uartputc(int);
 void	uartputs(char*);
+void	uartspecial(int, void (*)(int), int (*)(void), int);
 void*	vmap(ulong, int);
+void	wrmsr(int, vlong);
+
+#define PTR2UINT(p)	((uintptr)(p))
+#define UINT2PTR(i)	((void*)(i))\
 
 #define PADDR(a)	((uintptr)(a)-KZERO)
 #define PCIWADDR(a)	PADDR(a)
 #define	Pciwaddrl(a)	PADDR(a)
 #define	Pciwaddrh(a)	0
+
+/* old ata */
+//Off	ataread(int, void*, long, Devsize);
+//Off	atawrite(int, void*, long, Devsize);
+
+/* floppy */
+//int	floppyinit(void);
+//void	floppyproc(void);
+//Off	floppyread(int, void*, long, Devsize);
+//Off	floppywrite(int, void*, long, Devsize);
+
+/* scsi */
+void	scsiinit(void);
+Off	scsiread(int, void*, long);
+Devsize	scsiseek(int, Devsize);
+Off	scsiwrite(int, void*, long);
+int	setatapart(int, char*);
 
 /* pata */
 void	ideinit(Device*);
--- /sys/src/fs/port/auth.c	Tue Aug 27 15:27:33 2013
+++ /sys/src/fs/port/auth.c	Tue Aug 27 15:27:34 2013
@@ -236,7 +236,7 @@
 	if(*why)
 		print("authentication failed: %s: %s\n", phasename[s->phase], why);
 
-	srand((uintptr)s + m->ticks);
+	srand((uintptr)s + Ticks);
 	for(i = 0; i < CHALLEN; i++)
 		s->tr.chal[i] = nrand(256);
 	s->uid = -1;
--- /sys/src/fs/port/clock.c	Tue Aug 27 15:27:34 2013
+++ /sys/src/fs/port/clock.c	Tue Aug 27 15:27:35 2013
@@ -96,7 +96,7 @@
 
 	clockreload(n);
 	if(m->machno == 0)
-		m->ticks++;		/* wrong */
+		sys->ticks++;
 
 	if(cons.profile) {
 		cons.profbuf[0] += TK2MS(1);
@@ -123,7 +123,7 @@
 			f.cons = -1;
 		}
 
-		lights(Lreal, (m->ticks>>6)&1);
+		lights(Lreal, (sys->ticks>>6)&1);
 
 		f.time += TK2MS(1);
 		while(f.time >= 1000) {