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Index: sys/amd64/amd64/machdep.c
===================================================================
--- sys/amd64/amd64/machdep.c
+++ sys/amd64/amd64/machdep.c
@@ -124,6 +124,7 @@
#include <machine/mp_watchdog.h>
#include <machine/pc/bios.h>
#include <machine/pcb.h>
+#include <machine/physmem.h>
#include <machine/proc.h>
#include <machine/reg.h>
#include <machine/sigframe.h>
@@ -210,21 +214,6 @@
long Maxmem = 0;
long realmem = 0;
-/*
- * The number of PHYSMAP entries must be one less than the number of
- * PHYSSEG entries because the PHYSMAP entry that spans the largest
- * physical address that is accessible by ISA DMA is split into two
- * PHYSSEG entries.
- */
-#define PHYSMAP_SIZE (2 * (VM_PHYSSEG_MAX - 1))
-
-vm_paddr_t phys_avail[PHYSMAP_SIZE + 2];
-vm_paddr_t dump_avail[PHYSMAP_SIZE + 2];
-
-/* must be 2 less so 0 0 can signal end of chunks */
-#define PHYS_AVAIL_ARRAY_END (nitems(phys_avail) - 2)
-#define DUMP_AVAIL_ARRAY_END (nitems(dump_avail) - 2)
-
struct kva_md_info kmi;
static struct trapframe proc0_tf;
Index: sys/amd64/include/physmem.h
===================================================================
--- /dev/null
+++ sys/amd64/include/physmem.h
@@ -0,0 +1,51 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2018 Johannes Lundberg
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef _MACHINE_PHYSMEM_H_
+#define _MACHINE_PHYSMEM_H_
+
+#include <sys/types.h>
+#include <vm/vm_param.h>
+
+/*
+ * The number of PHYSMAP entries must be one less than the number of
+ * PHYSSEG entries because the PHYSMAP entry that spans the largest
+ * physical address that is accessible by ISA DMA is split into two
+ * PHYSSEG entries.
+ */
+#define PHYSMAP_SIZE (2 * (VM_PHYSSEG_MAX - 1))
+
+/* must be 2 less so 0 0 can signal end of chunks */
+#define PHYS_AVAIL_ARRAY_END (nitems(phys_avail) - 2)
+#define DUMP_AVAIL_ARRAY_END (nitems(dump_avail) - 2)
+
+/* kern_physmem.c */
+extern vm_paddr_t phys_avail[PHYSMAP_SIZE + 2];
+extern vm_paddr_t dump_avail[PHYSMAP_SIZE + 2];
+void phys_avail_reserve(vm_paddr_t start, vm_paddr_t end);
+
+#endif /* _MACHINE_PHYSMEM_H_ */
Index: sys/amd64/include/pmap.h
===================================================================
--- sys/amd64/include/pmap.h
+++ sys/amd64/include/pmap.h
@@ -239,6 +239,8 @@
#include <vm/_vm_radix.h>
+#include <machine/physmem.h>
+
typedef u_int64_t pd_entry_t;
typedef u_int64_t pt_entry_t;
typedef u_int64_t pdp_entry_t;
@@ -393,8 +395,6 @@
extern caddr_t CADDR1;
extern pt_entry_t *CMAP1;
-extern vm_paddr_t phys_avail[];
-extern vm_paddr_t dump_avail[];
extern vm_offset_t virtual_avail;
extern vm_offset_t virtual_end;
extern vm_paddr_t dmaplimit;
Index: sys/conf/files.amd64
===================================================================
--- sys/conf/files.amd64
+++ sys/conf/files.amd64
@@ -618,6 +618,7 @@
isa/syscons_isa.c optional sc
isa/vga_isa.c optional vga
kern/kern_clocksource.c standard
+kern/kern_physmem.c standard
kern/imgact_aout.c optional compat_aout
kern/imgact_gzip.c optional gzip
kern/link_elf_obj.c standard
Index: sys/conf/files.i386
===================================================================
--- sys/conf/files.i386
+++ sys/conf/files.i386
@@ -542,6 +542,7 @@
isa/syscons_isa.c optional sc
isa/vga_isa.c optional vga
kern/kern_clocksource.c standard
+kern/kern_physmem.c standard
kern/imgact_aout.c optional compat_aout
kern/imgact_gzip.c optional gzip
kern/subr_sfbuf.c standard
Index: sys/i386/i386/machdep.c
===================================================================
--- sys/i386/i386/machdep.c
+++ sys/i386/i386/machdep.c
@@ -127,6 +127,7 @@
#include <machine/pc/bios.h>
#include <machine/pcb.h>
#include <machine/pcb_ext.h>
+#include <machine/physmem.h>
#include <machine/proc.h>
#include <machine/reg.h>
#include <machine/sigframe.h>
@@ -192,21 +196,6 @@
FEATURE(pae, "Physical Address Extensions");
#endif
-/*
- * The number of PHYSMAP entries must be one less than the number of
- * PHYSSEG entries because the PHYSMAP entry that spans the largest
- * physical address that is accessible by ISA DMA is split into two
- * PHYSSEG entries.
- */
-#define PHYSMAP_SIZE (2 * (VM_PHYSSEG_MAX - 1))
-
-vm_paddr_t phys_avail[PHYSMAP_SIZE + 2];
-vm_paddr_t dump_avail[PHYSMAP_SIZE + 2];
-
-/* must be 2 less so 0 0 can signal end of chunks */
-#define PHYS_AVAIL_ARRAY_END (nitems(phys_avail) - 2)
-#define DUMP_AVAIL_ARRAY_END (nitems(dump_avail) - 2)
-
struct kva_md_info kmi;
static struct trapframe proc0_tf;
Index: sys/i386/include/physmem.h
===================================================================
--- /dev/null
+++ sys/i386/include/physmem.h
@@ -0,0 +1,51 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2018 Johannes Lundberg
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef _MACHINE_PHYSMEM_H_
+#define _MACHINE_PHYSMEM_H_
+
+#include <sys/types.h>
+#include <vm/vm_param.h>
+
+/*
+ * The number of PHYSMAP entries must be one less than the number of
+ * PHYSSEG entries because the PHYSMAP entry that spans the largest
+ * physical address that is accessible by ISA DMA is split into two
+ * PHYSSEG entries.
+ */
+#define PHYSMAP_SIZE (2 * (VM_PHYSSEG_MAX - 1))
+
+/* must be 2 less so 0 0 can signal end of chunks */
+#define PHYS_AVAIL_ARRAY_END (nitems(phys_avail) - 2)
+#define DUMP_AVAIL_ARRAY_END (nitems(dump_avail) - 2)
+
+/* kern_physmem.c */
+extern vm_paddr_t phys_avail[PHYSMAP_SIZE + 2];
+extern vm_paddr_t dump_avail[PHYSMAP_SIZE + 2];
+void phys_avail_reserve(vm_paddr_t start, vm_paddr_t end);
+
+#endif /* _MACHINE_PHYSMEM_H_ */
Index: sys/i386/include/pmap.h
===================================================================
--- sys/i386/include/pmap.h
+++ sys/i386/include/pmap.h
@@ -171,6 +171,8 @@
#include <vm/_vm_radix.h>
+#include <machine/physmem.h>
+
#if defined(PAE) || defined(PAE_TABLES)
typedef uint64_t pdpt_entry_t;
@@ -358,8 +360,6 @@
extern caddr_t CADDR3;
extern pt_entry_t *CMAP3;
-extern vm_paddr_t phys_avail[];
-extern vm_paddr_t dump_avail[];
extern char *ptvmmap; /* poor name! */
extern vm_offset_t virtual_avail;
extern vm_offset_t virtual_end;
Index: sys/kern/kern_physmem.c
===================================================================
--- /dev/null
+++ sys/kern/kern_physmem.c
@@ -0,0 +1,157 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2018 Johannes Lundberg
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <machine/physmem.h>
+
+static void phys_avail_insert_at(unsigned int index, vm_paddr_t val);
+static void phys_avail_delete_at(unsigned int index);
+
+vm_paddr_t phys_avail[PHYSMAP_SIZE + 2];
+vm_paddr_t dump_avail[PHYSMAP_SIZE + 2];
+
+static void
+phys_avail_insert_at(unsigned int index, vm_paddr_t val)
+{
+ unsigned int i;
+
+ i = PHYS_AVAIL_ARRAY_END;
+ while (i >= index) {
+ phys_avail[i + 1] = phys_avail[i];
+ i--;
+ }
+ phys_avail[i + 1] = val;
+}
+
+static void
+phys_avail_delete_at(unsigned int index)
+{
+ unsigned int i;
+
+ i = index;
+ while (i <= PHYS_AVAIL_ARRAY_END) {
+ phys_avail[i] = phys_avail[i + 1];
+ i++;
+ }
+}
+
+void
+phys_avail_reserve(vm_paddr_t start, vm_paddr_t end)
+{
+ unsigned int i;
+ /* Check if inside a hole before first segment. */
+ if (end <= phys_avail[0])
+ return;
+
+ i = 0;
+ /* Check if inside any hole. */
+ while (phys_avail[i + 2] != 0) {
+ if (start >= phys_avail[i + 1] && end <= phys_avail[i + 2])
+ return;
+ i += 2;
+ }
+
+ /* Check if new hole is after last segment end (i+1). */
+ if (start >= phys_avail[i + 1])
+ return;
+
+ i=0;
+ /* Check if inside any segment */
+ while (phys_avail[i + 1] != 0) {
+ if (start > phys_avail[i] && end < phys_avail[i + 1]) {
+ phys_avail_insert_at(i + 1, end);
+ phys_avail_insert_at(i + 1, start);
+ return;
+ }
+ i += 2;
+ }
+
+ /* Other cases */
+ i=0;
+ while (phys_avail[i] < start && i <= PHYS_AVAIL_ARRAY_END) {
+ i++;
+ }
+
+ if (phys_avail[i + 1] == 0) {
+ /* The new hole starts in the last segment and ends after. */
+ phys_avail[i] = start;
+ return;
+ }
+
+ /* At the index located on or after the new hole start. */
+ if (i % 2 == 0) {
+ /*
+ * Even index mean beginning of a segment. If hole ends in
+ * segment, shrink the segment. If exact match, delete the
+ * segment. Other cases are handled below.
+ */
+ if (start == phys_avail[i]) {
+ if (end < phys_avail[i + 1]) {
+ phys_avail[i] = end;
+ return;
+ } else if (end == phys_avail[i + 1]) {
+ phys_avail_delete_at(i);
+ phys_avail_delete_at(i);
+ return;
+ }
+ }
+ } else {
+ /*
+ * Odd index mean the hole starts inside a memory segment.
+ * Shrink segment to hole start.
+ */
+ phys_avail[i] = start;
+ i++;
+ }
+
+ int deleted = 0;
+ while (phys_avail[i] <= end && phys_avail[i + 1] != 0) {
+ phys_avail_delete_at(i);
+ deleted++;
+ }
+
+ /* At the index located after the new hole end. */
+ if (i % 2 == 0 && deleted % 2 == 1) {
+ /*
+ * If index is even and odd number of entries have been deleted,
+ * we are at the end of a segment. Insert hole end before this
+ * segment end.
+ */
+ phys_avail_insert_at(i, end);
+ } else if (i % 2 == 1) {
+ /*
+ * Odd index mean our hole ends in the previous segment,
+ * move segment start to new hole end.
+ */
+ phys_avail[i-1] = start;
+ }
+}

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