From a977d6c75f14582e9a1e812c1c70846411179311 Mon Sep 17 00:00:00 2001
From: Michael Shalayeff <mickey@cvs.openbsd.org>
Date: Thu, 25 Feb 1999 19:08:51 +0000
Subject: vmapbuf/vunmapbuf

---
 sys/arch/hppa/hppa/vm_machdep.c | 47 ++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 46 insertions(+), 1 deletion(-)

(limited to 'sys/arch')

diff --git a/sys/arch/hppa/hppa/vm_machdep.c b/sys/arch/hppa/hppa/vm_machdep.c
index 31a3b72fd8b..f88c8178770 100644
--- a/sys/arch/hppa/hppa/vm_machdep.c
+++ b/sys/arch/hppa/hppa/vm_machdep.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: vm_machdep.c,v 1.2 1999/01/10 13:34:18 niklas Exp $	*/
+/*	$OpenBSD: vm_machdep.c,v 1.3 1999/02/25 19:08:50 mickey Exp $	*/
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -8,6 +8,7 @@
 #include <sys/vnode.h>
 #include <sys/user.h>
 
+#include <vm/vm_kern.h>
 #include <machine/pmap.h>
 
 #include <vm/vm.h>
@@ -68,13 +69,21 @@ void
 cpu_fork(p1, p2)
 	struct proc *p1, *p2;
 {
+	p2->p_md.md_flags = p1->p_md.md_flags;
+
+	p2->p_addr->u_pcb = p1->p_addr->u_pcb;
+
+	/* TODO: create the child's kernel stack */
 }
 
 void
 cpu_exit(p)
 	struct proc *p;
 {
+	/* TODO: anything to be done about FPU */
 
+	vmspace_free(p->p_vmspace);
+	/* to the switch */
 }
 
 
@@ -94,18 +103,54 @@ cpu_set_kpc(p, pc, arg)
 
 }
 
+/*
+ * Map an IO request into kernel virtual address space.
+ */
 void
 vmapbuf(bp, len)
 	struct buf *bp;
 	vm_size_t len;
 {
+	vm_offset_t faddr, taddr, off, pa;
+	struct proc *p;
 
+	if ((bp->b_flags & B_PHYS) == 0)
+		panic("vmapbuf");
+	p = bp->b_proc;
+	faddr = trunc_page(bp->b_saveaddr = bp->b_data);
+	off = (vm_offset_t)bp->b_data - faddr;
+	len = round_page(off + len);
+	taddr = kmem_alloc_wait(phys_map, len);
+	bp->b_data = (caddr_t)(taddr + off);
+	len = atop(len);
+	while (len--) {
+		pa = pmap_extract(vm_map_pmap(&p->p_vmspace->vm_map), faddr);
+		if (pa == 0)
+			panic("vmapbuf: null page frame");
+		pmap_enter(vm_map_pmap(phys_map), taddr, trunc_page(pa),
+			   VM_PROT_READ|VM_PROT_WRITE, TRUE);
+		faddr += PAGE_SIZE;
+		taddr += PAGE_SIZE;
+	}
 }
 
+/*
+ * Unmap IO request from the kernel virtual address space.
+ */
 void
 vunmapbuf(bp, len)
 	struct buf *bp;
 	vm_size_t len;
 {
+	vm_offset_t addr, off;
+
+	if ((bp->b_flags & B_PHYS) == 0)
+		panic("vunmapbuf");
+	addr = trunc_page(bp->b_data);
+	off = (vm_offset_t)bp->b_data - addr;
+	len = round_page(off + len);
+	kmem_free_wakeup(phys_map, addr, len);
+	bp->b_data = bp->b_saveaddr;
+	bp->b_saveaddr = NULL;
 
 }
-- 
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