[src/trunk]: src/sys/arch/pmax Add a second memory free list, which holds the...

[thorpej <thorpej%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/199ee0627c01
branches:  trunk
changeset: 472797:199ee0627c01
user:      thorpej <thorpej%NetBSD.org@localhost>
date:      Fri May 07 18:04:36 1999 +0000

description:
Add a second memory free list, which holds the first 8M of RAM.  This is
so that devices which must allocate DMA memory in this range (e.g.
PixelStamp graphics boards) have a better chance of doing so, without
an awful hack.

diffstat:

 sys/arch/pmax/include/vmparam.h |   9 ++++++---
 sys/arch/pmax/pmax/machdep.c    |  19 +++++++++++++++----
 2 files changed, 21 insertions(+), 7 deletions(-)

diffs (67 lines):

diff -r ff6945b77dd5 -r 199ee0627c01 sys/arch/pmax/include/vmparam.h
--- a/sys/arch/pmax/include/vmparam.h   Fri May 07 17:38:41 1999 +0000
+++ b/sys/arch/pmax/include/vmparam.h   Fri May 07 18:04:36 1999 +0000
@@ -1,14 +1,17 @@
-/*     $NetBSD: vmparam.h,v 1.8 1998/07/08 04:43:19 thorpej Exp $      */
+/*     $NetBSD: vmparam.h,v 1.9 1999/05/07 18:04:37 thorpej Exp $      */
 
 #include <mips/vmparam.h>
 
 /*
  * DECstation has one physical memory segment.
  */
-#define        VM_PHYSSEG_MAX          1
+#define        VM_PHYSSEG_MAX          2       /* 2 free lists */
+#define        VM_PHYSSEG_STRAT        VM_PSTRAT_BSEARCH
+#define        VM_PHYSSEG_NOADD                /* can't add RAM after vm_mem_init */
 
-#define        VM_NFREELIST            1
+#define        VM_NFREELIST            2
 #define        VM_FREELIST_DEFAULT     0
+#define        VM_FREELIST_FIRST8      1
 
 /* pcb base */
 /*#define      pcbb(p)         ((u_int)(p)->p_addr) */
diff -r ff6945b77dd5 -r 199ee0627c01 sys/arch/pmax/pmax/machdep.c
--- a/sys/arch/pmax/pmax/machdep.c      Fri May 07 17:38:41 1999 +0000
+++ b/sys/arch/pmax/pmax/machdep.c      Fri May 07 18:04:36 1999 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: machdep.c,v 1.139 1999/04/26 09:23:26 nisimura Exp $   */
+/*     $NetBSD: machdep.c,v 1.140 1999/05/07 18:04:36 thorpej Exp $    */
 
 /*
  * Copyright (c) 1988 University of Utah.
@@ -43,7 +43,7 @@
 
 #include <sys/cdefs.h>                 /* RCS ID & Copyright macro defns */
 
-__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.139 1999/04/26 09:23:26 nisimura Exp $");
+__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.140 1999/05/07 18:04:36 thorpej Exp $");
 
 /* from: Utah Hdr: machdep.c 1.63 91/04/24 */
 
@@ -439,11 +439,22 @@
 
        /*
         * Load the rest of the available pages into the VM system.
+        * Put the first 8M of RAM onto a lower-priority free list, since
+        * some TC boards (e.g. PixelStamp boards) are only able to DMA
+        * into this region, and we want them to have a fighting chance of
+        * allocating their DMA memory during autoconfiguratoin.
         */
        first = round_page(MIPS_KSEG0_TO_PHYS(kernend));
        last = mem_clusters[0].start + mem_clusters[0].size;
-       uvm_page_physload(atop(first), atop(last), atop(first), atop(last),
-           VM_FREELIST_DEFAULT);
+       if (last <= (8 * 1024 * 1024)) {
+               uvm_page_physload(atop(first), atop(last), atop(first),
+                   atop(last), VM_FREELIST_DEFAULT);
+       } else {
+               uvm_page_physload(atop(first), atop(8 * 1024 * 1024),
+                   atop(first), atop(8 * 1024 * 1024), VM_FREELIST_FIRST8);
+               uvm_page_physload(atop(8 * 1024 * 1024), atop(last),
+                   atop(8 * 1024 * 1024), atop(last), VM_FREELIST_DEFAULT);
+       }
 
        /*
         * Initialize error message buffer (at end of core).