From 1c2496c3577f6a6396e9a7a399e7336a911ab3fe Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Wed, 12 Jun 1991 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 1991-06-12

---
 pc/dat.h | 180 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 pc/mmu.c |  13 ++++
 2 files changed, 193 insertions(+)
 create mode 100644 pc/dat.h
 create mode 100644 pc/mmu.c

diff --git a/pc/dat.h b/pc/dat.h
new file mode 100644
index 0000000000000000000000000000000000000000..a65313e09c41f662b2ab138b095595fb550ec98d
--- /dev/null
+++ b/pc/dat.h
@@ -0,0 +1,180 @@
+typedef struct Conf	Conf;
+typedef struct Label	Label;
+typedef struct Lock	Lock;
+typedef struct MMU	MMU;
+typedef struct Mach	Mach;
+typedef struct PMMU	PMMU;
+typedef struct Ureg	Ureg;
+typedef struct User	User;
+
+#define	MACHP(n)	(n==0? &mach0 : *(Mach**)0)
+
+extern	Mach	mach0;
+extern  void	(*kprofp)(ulong);
+
+/*
+ *  parameters for sysproc.c
+ */
+#define AOUT_MAGIC	I_MAGIC
+
+struct Lock
+{
+	char	key;
+	ulong	pc;
+};
+
+struct Label
+{
+	ulong	sp;
+	ulong	pc;
+	ushort	sr;
+};
+
+/*
+ * floating point registers
+ */
+enum
+{
+	FPinit,
+	FPactive,
+	FPdirty,
+};
+
+struct	FPsave
+{
+	uchar	type;
+	uchar	size;
+	short	reserved;
+	char	junk[212];	/* 68881: sizes 24, 180; 68882: 56, 212 */
+	char	reg[3*4+8*12];
+};
+
+struct Conf
+{
+	int	nmach;		/* processors */
+	int	nproc;		/* processes */
+	int	npgrp;		/* process groups */
+	ulong	npage0;		/* total physical pages of memory, bank 0 */
+	ulong	npage1;		/* total physical pages of memory, bank 1 */
+	ulong	base0;		/* base of bank 0 */
+	ulong	base1;		/* base of bank 1 */
+	ulong	npage;		/* total physical pages of memory */
+	ulong	norig;		/* origins */
+	ulong	npte;		/* contiguous page table entries */
+	ulong	nmod;		/* single (modifying) page table entries */
+	int	nalarm;		/* alarms */
+	int	nchan;		/* channels */
+	int	nenv;		/* distinct environment values */
+	int	nenvchar;	/* environment text storage */
+	int	npgenv;		/* environment files per process group */
+	int	nmtab;		/* mounted-upon channels per process group */
+	int	nmount;		/* mounts */
+	int	nmntdev;	/* mounted devices (devmnt.c) */
+	int	nmntbuf;	/* buffers for devmnt.c messages */
+	int	nmnthdr;	/* headers for devmnt.c messages */
+	int	nstream;	/* streams */
+	int	nqueue;		/* stream queues */
+	int	nblock;		/* stream blocks */
+	int	nsrv;		/* public servers (devsrv.c) */
+	int	nbitmap;	/* bitmap structs (devbit.c) */
+	int	nbitbyte;	/* bytes of bitmap data (devbit.c) */
+	int	nfont;		/* font structs (devbit.c) */
+	int	nurp;		/* max urp conversations */
+	int	nasync;		/* number of async protocol modules */
+	int	npipe;		/* number of pipes */
+	int	nservice;	/* number of services */
+	int	nfsyschan;	/* number of filsys open channels */
+	ulong	maxialloc;	/* maximum bytes used by ialloc */
+	int	copymode;	/* 0 is copy on write, 1 is copy on reference */
+	int	portispaged;	/* ??? */
+	int	nnoifc;
+	int	nnoconv;
+	ulong	ipif;		/* Ip protocol interfaces */
+	ulong	ip;		/* Ip conversations per interface */
+	ulong	arp;		/* Arp table size */
+	ulong	frag;		/* Ip fragment assemble queue size */
+	int	cntrlp;		/* panic on ^P */
+};
+
+/*
+ *  MMU stuff in proc
+ */
+struct PMMU
+{
+	MMU	*mmu;
+};
+
+#include "../port/portdat.h"
+
+/*
+ *  machine dependent definitions not used by ../port/dat.h
+ */
+
+struct Mach
+{
+	int	machno;			/* physical id of processor */
+	ulong	splpc;			/* pc of last caller to splhi */
+	int	mmask;			/* 1<<m->machno */
+	ulong	ticks;			/* of the clock since boot time */
+	Proc	*proc;			/* current process on this processor */
+	Label	sched;			/* scheduler wakeup */
+	Lock	alarmlock;		/* access to alarm list */
+	void	*alarm;			/* alarms bound to this clock */
+	int	fpstate;		/* state of fp registers on machine */
+
+	int	tlbfault;
+	int	tlbpurge;
+	int	pfault;
+	int	cs;
+	int	syscall;
+	int	spinlock;
+	int	intr;
+
+	int	stack[1];
+};
+
+/*
+ * Fake kmap
+ */
+typedef void		KMap;
+#define	VA(k)		((ulong)(k))
+#define	kmap(p)		(KMap*)(p->pa|KZERO)
+#define	kunmap(k)
+
+#define	NERR	15
+#define	NNOTE	5
+#define	NFD	100
+struct User
+{
+	Proc	*p;
+	int	nerrlab;
+	Label	errlab[NERR];
+	char	error[ERRLEN];
+	FPsave	fpsave;			/* address of this is known by vdb */
+	char	elem[NAMELEN];		/* last name element from namec */
+	Chan	*slash;
+	Chan	*dot;
+	Chan	*fd[NFD];
+	int	maxfd;			/* highest fd in use */
+	/*
+	 * Rest of structure controlled by devproc.c and friends.
+	 * lock(&p->debug) to modify.
+	 */
+	Note	note[NNOTE];
+	short	nnote;
+	short	notified;		/* sysnoted is due */
+	int	(*notify)(void*, char*);
+	void	*ureg;
+	ushort	svvo;
+	ushort	svsr;
+};
+
+struct
+{
+	Lock;
+	short	machs;
+	short	exiting;
+}active;
+
+extern Mach	*m;
+extern User	*u;
diff --git a/pc/mmu.c b/pc/mmu.c
new file mode 100644
index 0000000000000000000000000000000000000000..b91a6e22632f01c8dc9327f8d803c9f33c2b2778
--- /dev/null
+++ b/pc/mmu.c
@@ -0,0 +1,13 @@
+#include	"u.h"
+#include	"lib.h"
+#include	"mem.h"
+#include	"dat.h"
+#include	"fns.h"
+#include	"io.h"
+
+
+
+void
+mapstack(Proc *p)
+{
+}