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📄 Makefile(302 B)
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📄 capabilities.conf(13.67 KB)
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📄 cpufreq_if.m(2.27 KB)
📄 device_if.m(10.41 KB)
📄 firmw.S(2.15 KB)
📄 genassym.sh(1.11 KB)
📄 genoffset.c(1.68 KB)
📄 genoffset.sh(3.58 KB)
📄 imgact_aout.c(9.45 KB)
📄 imgact_binmisc.c(18.64 KB)
📄 imgact_elf.c(76.32 KB)
📄 imgact_elf32.c(1.47 KB)
📄 imgact_elf64.c(1.47 KB)
📄 imgact_shell.c(8.41 KB)
📄 init_main.c(24.31 KB)
📄 init_sysent.c(95.3 KB)
📄 kern_acct.c(19.03 KB)
📄 kern_alq.c(24.97 KB)
📄 kern_clock.c(21.12 KB)
📄 kern_clocksource.c(23.34 KB)
📄 kern_condvar.c(11.28 KB)
📄 kern_conf.c(36.14 KB)
📄 kern_cons.c(15.75 KB)
📄 kern_context.c(3.59 KB)
📄 kern_cpu.c(30.77 KB)
📄 kern_cpuset.c(59.78 KB)
📄 kern_ctf.c(8.73 KB)
📄 kern_descrip.c(112.87 KB)
📄 kern_dtrace.c(2.94 KB)
📄 kern_dump.c(8.51 KB)
📄 kern_environment.c(22.75 KB)
📄 kern_et.c(7.1 KB)
📄 kern_event.c(62.49 KB)
📄 kern_exec.c(46.67 KB)
📄 kern_exit.c(34.61 KB)
📄 kern_fail.c(29.32 KB)
📄 kern_ffclock.c(12.66 KB)
📄 kern_fork.c(28.29 KB)
📄 kern_hhook.c(13.58 KB)
📄 kern_idle.c(2.74 KB)
📄 kern_intr.c(40.44 KB)
📄 kern_jail.c(112.67 KB)
📄 kern_kcov.c(15.32 KB)
📄 kern_khelp.c(9.45 KB)
📄 kern_kthread.c(11.8 KB)
📄 kern_ktr.c(11.93 KB)
📄 kern_ktrace.c(31.41 KB)
📄 kern_linker.c(54.3 KB)
📄 kern_lock.c(46.99 KB)
📄 kern_lockf.c(64.46 KB)
📄 kern_lockstat.c(3.8 KB)
📄 kern_loginclass.c(6.69 KB)
📄 kern_malloc.c(37.09 KB)
📄 kern_mbuf.c(43.16 KB)
📄 kern_mib.c(24.26 KB)
📄 kern_module.c(11.05 KB)
📄 kern_mtxpool.c(5.82 KB)
📄 kern_mutex.c(33.62 KB)
📄 kern_ntptime.c(32.49 KB)
📄 kern_osd.c(12.37 KB)
📄 kern_physio.c(5.74 KB)
📄 kern_pmc.c(8.89 KB)
📄 kern_poll.c(15.86 KB)
📄 kern_priv.c(9.14 KB)
📄 kern_proc.c(80.01 KB)
📄 kern_procctl.c(19.48 KB)
📄 kern_prot.c(57.94 KB)
📄 kern_racct.c(34.01 KB)
📄 kern_rangelock.c(8.67 KB)
📄 kern_rctl.c(53.87 KB)
📄 kern_resource.c(36.66 KB)
📄 kern_rmlock.c(28.27 KB)
📄 kern_rwlock.c(40.72 KB)
📄 kern_sdt.c(2.05 KB)
📄 kern_sema.c(4.85 KB)
📄 kern_sendfile.c(33.97 KB)
📄 kern_sharedpage.c(10.37 KB)
📄 kern_shutdown.c(43.34 KB)
📄 kern_sig.c(101.89 KB)
📄 kern_switch.c(13.85 KB)
📄 kern_sx.c(40.27 KB)
📄 kern_synch.c(18.17 KB)
📄 kern_syscalls.c(6.74 KB)
📄 kern_sysctl.c(67.24 KB)
📄 kern_tc.c(55.73 KB)
📄 kern_thr.c(14.14 KB)
📄 kern_thread.c(41.75 KB)
📄 kern_time.c(40.89 KB)
📄 kern_timeout.c(43.08 KB)
📄 kern_tslog.c(3.44 KB)
📄 kern_ubsan.c(50.74 KB)
📄 kern_umtx.c(107.14 KB)
📄 kern_uuid.c(11.68 KB)
📄 kern_xxx.c(10.44 KB)
📄 ksched.c(6.56 KB)
📄 link_elf.c(47.99 KB)
📄 link_elf_obj.c(44.41 KB)
📄 linker_if.m(3.96 KB)
📄 makesyscalls.sh(23.57 KB)
📄 md4c.c(7.89 KB)
📄 md5c.c(9.56 KB)
📄 msi_if.m(2.48 KB)
📄 p1003_1b.c(8.84 KB)
📄 pic_if.m(3.9 KB)
📄 posix4_mib.c(5.59 KB)
📄 sched_4bsd.c(45.03 KB)
📄 sched_ule.c(82.65 KB)
📄 serdev_if.m(3.49 KB)
📄 stack_protector.c(613 B)
📄 subr_acl_nfs4.c(37.42 KB)
📄 subr_acl_posix1e.c(17.71 KB)
📄 subr_atomic64.c(3.97 KB)
📄 subr_autoconf.c(7.7 KB)
📄 subr_blist.c(31.88 KB)
📄 subr_boot.c(5.8 KB)
📄 subr_bufring.c(2.21 KB)
📄 subr_bus.c(145.4 KB)
📄 subr_bus_dma.c(19.67 KB)
📄 subr_busdma_bufalloc.c(5.24 KB)
📄 subr_capability.c(11.93 KB)
📄 subr_clock.c(10.61 KB)
📄 subr_compressor.c(13.11 KB)
📄 subr_counter.c(4.44 KB)
📄 subr_coverage.c(6.17 KB)
📄 subr_csan.c(25.39 KB)
📄 subr_devmap.c(9.8 KB)
📄 subr_devstat.c(16.21 KB)
📄 subr_disk.c(8.54 KB)
📄 subr_dummy_vdso_tc.c(1.7 KB)
📄 subr_early.c(2.26 KB)
📄 subr_epoch.c(25.02 KB)
📄 subr_eventhandler.c(9.17 KB)
📄 subr_fattime.c(9.98 KB)
📄 subr_filter.c(12.2 KB)
📄 subr_firmware.c(13.88 KB)
📄 subr_gtaskqueue.c(20.19 KB)
📄 subr_hash.c(4.8 KB)
📄 subr_hints.c(12.87 KB)
📄 subr_intr.c(40.61 KB)
📄 subr_kdb.c(16.13 KB)
📄 subr_kobj.c(7.1 KB)
📄 subr_lock.c(18.81 KB)
📄 subr_log.c(7.64 KB)
📄 subr_mchain.c(11.06 KB)
📄 subr_module.c(12.98 KB)
📄 subr_msgbuf.c(10.6 KB)
📄 subr_param.c(10.93 KB)
📄 subr_pcpu.c(10.18 KB)
📄 subr_pctrie.c(20.99 KB)
📄 subr_physmem.c(11.52 KB)
📄 subr_pidctrl.c(5.43 KB)
📄 subr_power.c(3.13 KB)
📄 subr_prf.c(27.42 KB)
📄 subr_prng.c(3.36 KB)
📄 subr_prof.c(15.43 KB)
📄 subr_rangeset.c(8.5 KB)
📄 subr_rman.c(27.61 KB)
📄 subr_rtc.c(11.42 KB)
📄 subr_sbuf.c(20.53 KB)
📄 subr_scanf.c(15.59 KB)
📄 subr_sfbuf.c(6.17 KB)
📄 subr_sglist.c(22.83 KB)
📄 subr_sleepqueue.c(39.43 KB)
📄 subr_smp.c(31.62 KB)
📄 subr_smr.c(20.17 KB)
📄 subr_stack.c(6.47 KB)
📄 subr_stats.c(103.01 KB)
📄 subr_syscall.c(7.98 KB)
📄 subr_taskqueue.c(21.1 KB)
📄 subr_terminal.c(15.52 KB)
📄 subr_trap.c(10.87 KB)
📄 subr_turnstile.c(35.58 KB)
📄 subr_uio.c(11.38 KB)
📄 subr_unit.c(22.97 KB)
📄 subr_vmem.c(43.25 KB)
📄 subr_witness.c(84.59 KB)
📄 sys_capability.c(15.06 KB)
📄 sys_eventfd.c(8.42 KB)
📄 sys_generic.c(44.22 KB)
📄 sys_getrandom.c(4.21 KB)
📄 sys_pipe.c(45.14 KB)
📄 sys_procdesc.c(14.57 KB)
📄 sys_process.c(30.73 KB)
📄 sys_socket.c(20.11 KB)
📄 syscalls.c(22.73 KB)
📄 syscalls.master(60.26 KB)
📄 systrace_args.c(178.49 KB)
📄 sysv_ipc.c(6.53 KB)
📄 sysv_msg.c(48.65 KB)
📄 sysv_sem.c(49.85 KB)
📄 sysv_shm.c(43.93 KB)
📄 tty.c(55.14 KB)
📄 tty_compat.c(11.46 KB)
📄 tty_info.c(9.93 KB)
📄 tty_inq.c(12.22 KB)
📄 tty_outq.c(8.74 KB)
📄 tty_pts.c(19.74 KB)
📄 tty_tty.c(2.83 KB)
📄 tty_ttydisc.c(28.6 KB)
📄 uipc_accf.c(8.07 KB)
📄 uipc_debug.c(12.42 KB)
📄 uipc_domain.c(13.13 KB)
📄 uipc_ktls.c(55.7 KB)
📄 uipc_mbuf.c(52.45 KB)
📄 uipc_mbuf2.c(12.64 KB)
📄 uipc_mbufhash.c(4.9 KB)
📄 uipc_mqueue.c(64.64 KB)
📄 uipc_sem.c(25.18 KB)
📄 uipc_shm.c(50.47 KB)
📄 uipc_sockbuf.c(42.9 KB)
📄 uipc_socket.c(110.61 KB)
📄 uipc_syscalls.c(35.94 KB)
📄 uipc_usrreq.c(75.11 KB)
📄 vfs_acl.c(14.5 KB)
📄 vfs_aio.c(76.32 KB)
📄 vfs_bio.c(145.39 KB)
📄 vfs_cache.c(143.09 KB)
📄 vfs_cluster.c(28.36 KB)
📄 vfs_default.c(33.16 KB)
📄 vfs_export.c(14.55 KB)
📄 vfs_extattr.c(17.91 KB)
📄 vfs_hash.c(6 KB)
📄 vfs_init.c(15.86 KB)
📄 vfs_lookup.c(45.48 KB)
📄 vfs_mount.c(62.58 KB)
📄 vfs_mountroot.c(26.23 KB)
📄 vfs_subr.c(167.52 KB)
📄 vfs_syscalls.c(106.86 KB)
📄 vfs_vnops.c(86.28 KB)
📄 vnode_if.src(13.66 KB)

Editing: subr_physmem.c

/*-
 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
 *
 * Copyright (c) 2014 Ian Lepore <ian@freebsd.org>
 * All rights reserved.
 *
 * 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 "opt_acpi.h"
#include "opt_ddb.h"

/*
 * Routines for describing and initializing anything related to physical memory.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/physmem.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/vm_page.h>
#include <vm/vm_phys.h>
#include <vm/vm_dumpset.h>
#include <machine/md_var.h>

/*
 * These structures are used internally to keep track of regions of physical
 * ram, and regions within the physical ram that need to be excluded.  An
 * exclusion region can be excluded from crash dumps, from the vm pool of pages
 * that can be allocated, or both, depending on the exclusion flags associated
 * with the region.
 */
#ifdef DEV_ACPI
#define	MAX_HWCNT	32	/* ACPI needs more regions */
#define	MAX_EXCNT	32
#else
#define	MAX_HWCNT	16
#define	MAX_EXCNT	16
#endif

#if defined(__arm__)
#define	MAX_PHYS_ADDR	0xFFFFFFFFull
#elif defined(__aarch64__) || defined(__riscv)
#define	MAX_PHYS_ADDR	0xFFFFFFFFFFFFFFFFull
#endif

struct region {
	vm_paddr_t	addr;
	vm_size_t	size;
	uint32_t	flags;
};

static struct region hwregions[MAX_HWCNT];
static struct region exregions[MAX_EXCNT];

static size_t hwcnt;
static size_t excnt;

/*
 * realmem is the total number of hardware pages, excluded or not.
 * Maxmem is one greater than the last physical page number.
 */
long realmem;
long Maxmem;

/*
 * Print the contents of the physical and excluded region tables using the
 * provided printf-like output function (which will be either printf or
 * db_printf).
 */
static void
physmem_dump_tables(int (*prfunc)(const char *, ...))
{
	int flags, i;
	uintmax_t addr, size;
	const unsigned int mbyte = 1024 * 1024;

prfunc("Physical memory chunk(s):\n");
	for (i = 0; i < hwcnt; ++i) {
		addr = hwregions[i].addr;
		size = hwregions[i].size;
		prfunc("  0x%08jx - 0x%08jx, %5ju MB (%7ju pages)\n", addr,
		    addr + size - 1, size / mbyte, size / PAGE_SIZE);
	}

prfunc("Excluded memory regions:\n");
	for (i = 0; i < excnt; ++i) {
		addr  = exregions[i].addr;
		size  = exregions[i].size;
		flags = exregions[i].flags;
		prfunc("  0x%08jx - 0x%08jx, %5ju MB (%7ju pages) %s %s\n",
		    addr, addr + size - 1, size / mbyte, size / PAGE_SIZE,
		    (flags & EXFLAG_NOALLOC) ? "NoAlloc" : "",
		    (flags & EXFLAG_NODUMP)  ? "NoDump" : "");
	}

#ifdef DEBUG
	prfunc("Avail lists:\n");
	for (i = 0; phys_avail[i] != 0; ++i) {
		prfunc("  phys_avail[%d] 0x%08x\n", i, phys_avail[i]);
	}
	for (i = 0; dump_avail[i] != 0; ++i) {
		prfunc("  dump_avail[%d] 0x%08x\n", i, dump_avail[i]);
	}
#endif
}

/*
 * Print the contents of the static mapping table.  Used for bootverbose.
 */
void
physmem_print_tables(void)
{

physmem_dump_tables(printf);
}

/*
 * Walk the list of hardware regions, processing it against the list of
 * exclusions that contain the given exflags, and generating an "avail list".
 * 
 * If maxphyssz is not zero it sets upper limit, in bytes, for the total
 * "avail list" size. Walk stops once the limit is reached and the last region
 * is cut short if necessary.
 *
 * Updates the value at *pavail with the sum of all pages in all hw regions.
 *
 * Returns the number of pages of non-excluded memory added to the avail list.
 */
static size_t
regions_to_avail(vm_paddr_t *avail, uint32_t exflags, size_t maxavail,
    uint64_t maxphyssz, long *pavail, long *prealmem)
{
	size_t acnt, exi, hwi;
	uint64_t end, start, xend, xstart;
	long availmem, totalmem;
	const struct region *exp, *hwp;
	uint64_t availsz;

totalmem = 0;
	availmem = 0;
	availsz = 0;
	acnt = 0;
	for (hwi = 0, hwp = hwregions; hwi < hwcnt; ++hwi, ++hwp) {
		start = hwp->addr;
		end   = hwp->size + start;
		totalmem += atop((vm_offset_t)(end - start));
		for (exi = 0, exp = exregions; exi < excnt; ++exi, ++exp) {
			/*
			 * If the excluded region does not match given flags,
			 * continue checking with the next excluded region.
			 */
			if ((exp->flags & exflags) == 0)
				continue;
			xstart = exp->addr;
			xend   = exp->size + xstart;
			/*
			 * If the excluded region ends before this hw region,
			 * continue checking with the next excluded region.
			 */
			if (xend <= start)
				continue;
			/*
			 * If the excluded region begins after this hw region
			 * we're done because both lists are sorted.
			 */
			if (xstart >= end)
				break;
			/*
			 * If the excluded region completely covers this hw
			 * region, shrink this hw region to zero size.
			 */
			if ((start >= xstart) && (end <= xend)) {
				start = xend;
				end = xend;
				break;
			}
			/*
			 * If the excluded region falls wholly within this hw
			 * region without abutting or overlapping the beginning
			 * or end, create an available entry from the leading
			 * fragment, then adjust the start of this hw region to
			 * the end of the excluded region, and continue checking
			 * the next excluded region because another exclusion
			 * could affect the remainder of this hw region.
			 */
			if ((xstart > start) && (xend < end)) {

if ((maxphyssz != 0) &&
				    (availsz + xstart - start > maxphyssz)) {
					xstart = maxphyssz + start - availsz;
				}
				if (xstart <= start)
					continue;
				if (acnt > 0 &&
				    avail[acnt - 1] == (vm_paddr_t)start) {
					avail[acnt - 1] = (vm_paddr_t)xstart;
				} else {
					avail[acnt++] = (vm_paddr_t)start;
					avail[acnt++] = (vm_paddr_t)xstart;
				}
				availsz += (xstart - start);
				availmem += atop((vm_offset_t)(xstart - start));
				start = xend;
				continue;
			}
			/*
			 * We know the excluded region overlaps either the start
			 * or end of this hardware region (but not both), trim
			 * the excluded portion off the appropriate end.
			 */
			if (xstart <= start)
				start = xend;
			else
				end = xstart;
		}
		/*
		 * If the trimming actions above left a non-zero size, create an
		 * available entry for it.
		 */
		if (end > start) {
			if ((maxphyssz != 0) &&
			    (availsz + end - start > maxphyssz)) {
				end = maxphyssz + start - availsz;
			}
			if (end <= start)
				break;

if (acnt > 0 && avail[acnt - 1] == (vm_paddr_t)start) {
				avail[acnt - 1] = (vm_paddr_t)end;
			} else {
				avail[acnt++] = (vm_paddr_t)start;
				avail[acnt++] = (vm_paddr_t)end;
			}
			availsz += end - start;
			availmem += atop((vm_offset_t)(end - start));
		}
		if (acnt >= maxavail)
			panic("Not enough space in the dump/phys_avail arrays");
	}

if (pavail != NULL)
		*pavail = availmem;
	if (prealmem != NULL)
		*prealmem = totalmem;
	return (acnt);
}

/*
 * Insertion-sort a new entry into a regions list; sorted by start address.
 */
static size_t
insert_region(struct region *regions, size_t rcnt, vm_paddr_t addr,
    vm_size_t size, uint32_t flags)
{
	size_t i;
	struct region *ep, *rp;

ep = regions + rcnt;
	for (i = 0, rp = regions; i < rcnt; ++i, ++rp) {
		if (rp->addr == addr && rp->size == size) /* Pure dup. */
			return (rcnt);
		if (flags == rp->flags) {
			if (addr + size == rp->addr) {
				rp->addr = addr;
				rp->size += size;
				return (rcnt);
			} else if (rp->addr + rp->size == addr) {
				rp->size += size;
				return (rcnt);
			}
		}
		if (addr < rp->addr) {
			bcopy(rp, rp + 1, (ep - rp) * sizeof(*rp));
			break;
		}
	}
	rp->addr  = addr;
	rp->size  = size;
	rp->flags = flags;
	rcnt++;

return (rcnt);
}

/*
 * Add a hardware memory region.
 */
void
physmem_hardware_region(uint64_t pa, uint64_t sz)
{
	vm_offset_t adj;

/*
	 * Filter out the page at PA 0x00000000.  The VM can't handle it, as
	 * pmap_extract() == 0 means failure.
	 */
	if (pa == 0) {
		if (sz <= PAGE_SIZE)
			return;
		pa  = PAGE_SIZE;
		sz -= PAGE_SIZE;
	} else if (pa > MAX_PHYS_ADDR) {
		/* This range is past usable memory, ignore it */
		return;
	}

/*
	 * Also filter out the page at the end of the physical address space --
	 * if addr is non-zero and addr+size is zero we wrapped to the next byte
	 * beyond what vm_paddr_t can express.  That leads to a NULL pointer
	 * deref early in startup; work around it by leaving the last page out.
	 *
	 * XXX This just in:  subtract out a whole megabyte, not just 1 page.
	 * Reducing the size by anything less than 1MB results in the NULL
	 * pointer deref in _vm_map_lock_read().  Better to give up a megabyte
	 * than leave some folks with an unusable system while we investigate.
	 */
	if ((pa + sz) > (MAX_PHYS_ADDR - 1024 * 1024)) {
		sz = MAX_PHYS_ADDR - pa + 1;
		if (sz <= 1024 * 1024)
			return;
		sz -= 1024 * 1024;
	}

/*
	 * Round the starting address up to a page boundary, and truncate the
	 * ending page down to a page boundary.
	 */
	adj = round_page(pa) - pa;
	pa  = round_page(pa);
	sz  = trunc_page(sz - adj);

if (sz > 0 && hwcnt < nitems(hwregions))
		hwcnt = insert_region(hwregions, hwcnt, pa, sz, 0);
}

/*
 * Add an exclusion region.
 */
void
physmem_exclude_region(vm_paddr_t pa, vm_size_t sz, uint32_t exflags)
{
	vm_offset_t adj;

/*
	 * Truncate the starting address down to a page boundary, and round the
	 * ending page up to a page boundary.
	 */
	adj = pa - trunc_page(pa);
	pa  = trunc_page(pa);
	sz  = round_page(sz + adj);

if (excnt >= nitems(exregions))
		panic("failed to exclude region %#jx-%#jx", (uintmax_t)pa,
		    (uintmax_t)(pa + sz));
	excnt = insert_region(exregions, excnt, pa, sz, exflags);
}

size_t
physmem_avail(vm_paddr_t *avail, size_t maxavail)
{

return (regions_to_avail(avail, EXFLAG_NOALLOC, maxavail, 0, NULL, NULL));
}

/*
 * Process all the regions added earlier into the global avail lists.
 *
 * Updates the kernel global 'physmem' with the number of physical pages
 * available for use (all pages not in any exclusion region).
 *
 * Updates the kernel global 'Maxmem' with the page number one greater then the
 * last page of physical memory in the system.
 */
void
physmem_init_kernel_globals(void)
{
	size_t nextidx;
	u_long hwphyssz;

hwphyssz = 0;
	TUNABLE_ULONG_FETCH("hw.physmem", &hwphyssz);

regions_to_avail(dump_avail, EXFLAG_NODUMP, PHYS_AVAIL_ENTRIES,
	    hwphyssz, NULL, NULL);
	nextidx = regions_to_avail(phys_avail, EXFLAG_NOALLOC,
	    PHYS_AVAIL_ENTRIES, hwphyssz, &physmem, &realmem);
	if (nextidx == 0)
		panic("No memory entries in phys_avail");
	Maxmem = atop(phys_avail[nextidx - 1]);
}

#ifdef DDB
#include <ddb/ddb.h>

DB_SHOW_COMMAND(physmem, db_show_physmem)
{

physmem_dump_tables(db_printf);
}

#endif /* DDB */

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