[src/trunk]: src/sys/arch/arm Support directmapped systems with >1GB that sta...

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

details:   https://anonhg.NetBSD.org/src/rev/38238fc640a6
branches:  trunk
changeset: 808731:38238fc640a6
user:      matt <matt%NetBSD.org@localhost>
date:      Sat May 30 23:59:33 2015 +0000

description:
Support directmapped systems with >1GB that start memory at 0x80000000.

diffstat:

 sys/arch/arm/arm32/arm32_kvminit.c |  21 +++++++++++++++++----
 sys/arch/arm/arm32/pmap.c          |   7 ++++---
 sys/arch/arm/include/arm32/pmap.h  |   3 ++-
 3 files changed, 23 insertions(+), 8 deletions(-)

diffs (115 lines):

diff -r ddaf5f88e0d2 -r 38238fc640a6 sys/arch/arm/arm32/arm32_kvminit.c
--- a/sys/arch/arm/arm32/arm32_kvminit.c        Sat May 30 23:17:37 2015 +0000
+++ b/sys/arch/arm/arm32/arm32_kvminit.c        Sat May 30 23:59:33 2015 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: arm32_kvminit.c,v 1.33 2015/05/04 00:44:12 matt Exp $  */
+/*     $NetBSD: arm32_kvminit.c,v 1.34 2015/05/30 23:59:33 matt Exp $  */
 
 /*
  * Copyright (c) 2002, 2003, 2005  Genetec Corporation.  All rights reserved.
@@ -124,7 +124,7 @@
 #include "opt_multiprocessor.h"
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: arm32_kvminit.c,v 1.33 2015/05/04 00:44:12 matt Exp $");
+__KERNEL_RCSID(0, "$NetBSD: arm32_kvminit.c,v 1.34 2015/05/30 23:59:33 matt Exp $");
 
 #include <sys/param.h>
 #include <sys/device.h>
@@ -195,6 +195,7 @@
        if (physical_end == 0) {
                physical_end = -PAGE_SIZE;
                memsize -= PAGE_SIZE;
+               bmi->bmi_end -= PAGE_SIZE;
 #ifdef VERBOSE_INIT_ARM
                printf("%s: memsize shrunk by a page to avoid ending at 4GB\n",
                    __func__);
@@ -441,8 +442,10 @@
         * from TTBR0 to map some of the physical memory.  But try to use as
         * much high memory space as possible.
         */
-       if (kernel_vm_base - KERNEL_BASE < physical_size) {
-               pmap_directbase = kernel_vm_base - physical_size;
+       pmap_directlimit = kernel_vm_base;
+       if (kernel_vm_base - KERNEL_BASE < physical_size
+           && kernel_vm_base - physical_size >= physical_start) {
+               pmap_directbase -= KERNEL_BASE_VOFFSET;
                printf("%s: changing pmap_directbase to %#lx\n", __func__,
                    pmap_directbase);
        }
@@ -838,6 +841,9 @@
                    && cur_pv.pv_cache == PTE_CACHE) {
                        cur_pv.pv_size = bmi->bmi_end - cur_pv.pv_pa;
                } else {
+                       KASSERTMSG(cur_pv.pv_va + cur_pv.pv_size <= kernel_vm_base,
+                           "%#lx >= %#lx", cur_pv.pv_va + cur_pv.pv_size,
+                           kernel_vm_base);
 #ifdef VERBOSE_INIT_ARM
                        printf("%s: mapping chunk VA %#lx..%#lx "
                            "(PA %#lx, prot %d, cache %d)\n",
@@ -854,6 +860,13 @@
                }
        }
 
+       // The amount we can direct is limited by the start of the
+       // virtual part of the kernel address space.  Don't overrun
+       // into it.
+       if (mapallmem_p && cur_pv.pv_va + cur_pv.pv_size > kernel_vm_base) {
+               cur_pv.pv_size = kernel_vm_base - cur_pv.pv_va;
+       }
+
        /*
         * Now we map the final chunk.
         */
diff -r ddaf5f88e0d2 -r 38238fc640a6 sys/arch/arm/arm32/pmap.c
--- a/sys/arch/arm/arm32/pmap.c Sat May 30 23:17:37 2015 +0000
+++ b/sys/arch/arm/arm32/pmap.c Sat May 30 23:59:33 2015 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: pmap.c,v 1.322 2015/05/13 15:33:47 skrll Exp $ */
+/*     $NetBSD: pmap.c,v 1.323 2015/05/30 23:59:33 matt Exp $  */
 
 /*
  * Copyright 2003 Wasabi Systems, Inc.
@@ -216,7 +216,7 @@
 
 #include <arm/locore.h>
 
-__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.322 2015/05/13 15:33:47 skrll Exp $");
+__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.323 2015/05/30 23:59:33 matt Exp $");
 
 //#define PMAP_DEBUG
 #ifdef PMAP_DEBUG
@@ -517,6 +517,7 @@
  * Start of direct-mapped memory
  */
 vaddr_t pmap_directbase = KERNEL_BASE;
+vaddr_t pmap_directlimit;
 #endif
 
 /*
@@ -7859,7 +7860,7 @@
        if (physical_start <= pa && pa < physical_end) {
 #ifdef ARM_MMU_EXTENDED
                const vaddr_t newva = pmap_directbase + pa - physical_start;
-               if (newva >= KERNEL_BASE) {
+               if (newva >= KERNEL_BASE && newva < pmap_directlimit) {
                        va = newva;
                        ok = true;
                }
diff -r ddaf5f88e0d2 -r 38238fc640a6 sys/arch/arm/include/arm32/pmap.h
--- a/sys/arch/arm/include/arm32/pmap.h Sat May 30 23:17:37 2015 +0000
+++ b/sys/arch/arm/include/arm32/pmap.h Sat May 30 23:59:33 2015 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: pmap.h,v 1.139 2015/05/12 07:07:16 skrll Exp $ */
+/*     $NetBSD: pmap.h,v 1.140 2015/05/30 23:59:33 matt Exp $  */
 
 /*
  * Copyright (c) 2002, 2003 Wasabi Systems, Inc.
@@ -431,6 +431,7 @@
  * Starting VA of direct mapped memory (usually KERNEL_BASE).
  */
 extern vaddr_t pmap_directbase;
+extern vaddr_t pmap_directlimit;
 #endif
 
 /*