From 6afafac33166edd6d29025634f81987a5af6c24a Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Tue, 9 Feb 1993 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 1993-02-09

---
 port/portdat.h |  1 -
 port/sysfile.c |  7 +++++++
 port/systab.h  |  3 +++
 power/mmu.c    | 40 ++++++++++++++++++++++++++++++++++++++++
 4 files changed, 50 insertions(+), 1 deletion(-)

diff --git a/port/portdat.h b/port/portdat.h
index e213594213e000e24965a2b69b83df55a6b3fa2a..750f382e499e010f6cfcfc5657657c3d81042311 100644
--- a/port/portdat.h
+++ b/port/portdat.h
@@ -344,7 +344,6 @@ struct Page
 	ulong	va;			/* Virtual address for user */
 	ulong	daddr;			/* Disc address on swap */
 	ushort	ref;			/* Reference count */
-	char	lock;			/* Software lock */
 	char	modref;			/* Simulated modify/reference bits */
 	char	cachectl[MAXMACH];	/* Cache flushing control for putmmu */
 	Image	*image;			/* Associated text or swap image */
diff --git a/port/sysfile.c b/port/sysfile.c
index fecd25f68e178fb41a8bb0a0bf0e8fccd8aee641..2d9232ffea533bb385c36e77f5a9994d4072011f 100644
--- a/port/sysfile.c
+++ b/port/sysfile.c
@@ -84,6 +84,13 @@ openmode(ulong o)
 	return o;
 }
 
+long
+sysfsession(ulong *arg)
+{
+	USED(arg);
+	return 0;
+}
+
 long
 syspipe(ulong *arg)
 {
diff --git a/port/systab.h b/port/systab.h
index 0c89c102c0f9806f2b8593aa0bfe3a37e578e2e6..aa617daa669e3b0c40f14f08036f7b1459872586 100644
--- a/port/systab.h
+++ b/port/systab.h
@@ -40,6 +40,7 @@ Syscall syssegflush;
 Syscall sysrendezvous;
 Syscall sysunmount;
 Syscall syswait;
+Syscall sysfsession;
 Syscall	sysdeath;
 
 Syscall *systab[]={
@@ -80,6 +81,7 @@ Syscall *systab[]={
 	[RENDEZVOUS]	sysrendezvous,
 	[UNMOUNT]	sysunmount,
 	[WAIT]		syswait,
+	[FSESSION]	sysfsession,
 };
 
 char *sysctab[]={
@@ -120,4 +122,5 @@ char *sysctab[]={
 	[RENDEZVOUS]	"Rendez",
 	[UNMOUNT]	"Unmount",
 	[WAIT]		"Wait",
+	[FSESSION]	"Fsession",
 };
diff --git a/power/mmu.c b/power/mmu.c
index 39635632545fdd4d852f7cb51ec6885982764d43..202124eddc42f8969fe21c364961caee17e77862 100644
--- a/power/mmu.c
+++ b/power/mmu.c
@@ -180,3 +180,43 @@ putstlb(ulong tlbvirt, ulong tlbphys)
 	if(tlbphys == 0)
 		entry->virt = 0;
 }
+
+/* Mapping routines for td's frame buffer
+Page*
+a16seg(Segment *s, ulong va)
+{
+	Page *pg;
+
+	pg = smalloc(sizeof(Page));
+	memset(pg, 0, sizeof(Page));
+	pg->va = va;
+	pg->pa = 0xd0000 + (va - s->base);
+	pg->ref = 1;
+	return pg;
+}
+
+Page*
+a32seg(Segment *s, ulong va)
+{
+	Page *pg;
+
+	pg = smalloc(sizeof(Page));
+	memset(pg, 0, sizeof(Page));
+	pg->va = va;
+	pg->pa = VMEA32SUP(ulong, va - s->base);
+	pg->ref = 1;
+	return pg;
+}
+
+void
+vmefree(Page *pg)
+{
+	int x;
+
+	lock(pg);
+	x = --pg->ref;
+	unlock(pg);
+	if(x <= 0)
+		free(pg);
+}
+*/