From ea9d8a9b849aea2d7bba1c8ce1b89dcc7558a64b Mon Sep 17 00:00:00 2001
From: Niklas Hallqvist <niklas@cvs.openbsd.org>
Date: Tue, 8 Feb 2000 00:14:13 +0000
Subject: Split low ISA memory (<16MB) into its own freelist, which is used
 last by the VM subsystem.  This makes isadmaattach panics go away on large
 memory systems.  Also use atop instead of btoc for consistency when dealing
 with the initial chunks of physical memory to give to UVM.

---
 sys/arch/i386/i386/machdep.c | 47 ++++++++++++++++++++++++++++++--------------
 1 file changed, 32 insertions(+), 15 deletions(-)

(limited to 'sys')

diff --git a/sys/arch/i386/i386/machdep.c b/sys/arch/i386/i386/machdep.c
index 5990d58e530..58bcba53120 100644
--- a/sys/arch/i386/i386/machdep.c
+++ b/sys/arch/i386/i386/machdep.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: machdep.c,v 1.123 2000/02/03 15:32:23 niklas Exp $	*/
+/*	$OpenBSD: machdep.c,v 1.124 2000/02/08 00:14:12 niklas Exp $	*/
 /*	$NetBSD: machdep.c,v 1.214 1996/11/10 03:16:17 thorpej Exp $	*/
 
 /*-
@@ -170,6 +170,8 @@ extern struct proc *npxproc;
 
 #include "bios.h"
 
+#define	MIN(a,b) (((a)<(b))?(a):(b))
+
 /*
  * The following defines are for the code in setup_buffers that tries to
  * ensure that enough ISA DMAable memory is still left after the buffercache
@@ -2039,9 +2041,9 @@ init386(first_avail)
 				printf("\nWARNING: CAN'T ALLOCATE RAM (%x-%x)"
 				       " FROM IOMEM EXTENT MAP!\n", a, e);
 
-			physmem += btoc(e - a);
-			dumpmem[i].start = btoc(a);
-			dumpmem[i].end = btoc(e);
+			physmem += atop(e - a);
+			dumpmem[i].start = atop(a);
+			dumpmem[i].end = atop(e);
 			i++;
 			avail_end = max(avail_end, e);
 		}
@@ -2052,7 +2054,7 @@ init386(first_avail)
 #ifdef DEBUG
 	printf(": %lx\n", avail_end);
 #endif
-	if (physmem < btoc(4 * 1024 * 1024)) {
+	if (physmem < atop(4 * 1024 * 1024)) {
 		printf("\awarning: too little memory available;"
 		       "running in degraded mode\npress a key to confirm\n\n");
 		cngetc();
@@ -2062,23 +2064,38 @@ init386(first_avail)
 	printf("physload: ");
 #endif
 	for (i = 0; i < ndumpmem; i++) {
-		register int32_t a, e;
+		register int32_t a, e, lim;
 
 		a = dumpmem[i].start;
 		e = dumpmem[i].end;
-		if (a < btoc(first_avail) && e > btoc(first_avail))
-			a = btoc(first_avail);
+		if (a < atop(first_avail) && e > atop(first_avail))
+			a = atop(first_avail);
 		if (e > atop(avail_end))
 			e = atop(avail_end);
-#ifdef DEBUG
-		printf (" %x-%x", a, e);
-#endif
+
 		if (a < e) {
 #ifdef UVM
-			if (e <= 16 * 1024 * 1024)
-				uvm_page_physload(a, e, a, e, VM_FREELIST_FIRST16);
-			else
-				uvm_page_physload(a, e, a, e, VM_FREELIST_DEFAULT);
+			if (a < atop(16 * 1024 * 1024)) {
+				lim = MIN(atop(16 * 1024 * 1024), e);
+#ifdef DEBUG
+				printf (" %x-%x (<16M)", a, lim);
+#endif
+				uvm_page_physload(a, lim, a, lim,
+				    VM_FREELIST_FIRST16);
+				if (e > lim) {
+#ifdef DEBUG
+					printf (" %x-%x", lim, e);
+#endif
+					uvm_page_physload(lim, e, lim, e,
+					    VM_FREELIST_DEFAULT);
+				}
+			} else {
+#ifdef DEBUG
+				printf (" %x-%x", a, e);
+#endif
+				uvm_page_physload(a, e, a, e,
+				    VM_FREELIST_DEFAULT);
+			}
 #else
 			vm_page_physload(a, e, a, e);
 #endif
-- 
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