xref: /illumos-gate/usr/src/uts/common/os/space.c (revision b8ffbd31)

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 * Copyright 2016 Nexenta Systems, Inc.
 * Copyright 2020 Joyent, Inc.
 */

/*
 * The intent of this file is to contain any data that must remain
 * resident in the kernel.
 *
 * space_store(), space_fetch(), and space_free() have been added to
 * easily store and retrieve kernel resident data.
 * These functions are recommended rather than adding new variables to
 * this file.
 *
 * Note that it's possible for name collisions to occur.  In order to
 * prevent collisions, it's recommended that the convention in
 * PSARC/1997/389 be used.  If a collision occurs, then space_store will
 * fail.
 */

#include <sys/types.h>
#include <sys/param.h>
#include <sys/var.h>
#include <sys/proc.h>
#include <sys/signal.h>
#include <sys/utsname.h>
#include <sys/buf.h>
#include <sys/cred.h>
#include <sys/vfs.h>
#include <sys/vnode.h>
#include <sys/sysinfo.h>
#include <sys/t_lock.h>
#include <sys/vmem.h>
#include <sys/modhash.h>
#include <sys/cmn_err.h>

#include <sys/strredir.h>
#include <sys/kbio.h>
#include <sys/consdev.h>
#include <sys/wscons.h>
#include <sys/bootprops.h>

struct	buf	bfreelist;	/* Head of the free list of buffers */

sysinfo_t	sysinfo;
vminfo_t	vminfo;		/* VM stats protected by sysinfolock mutex */

#ifdef	lint
int	__lintzero;		/* Alway zero for shutting up lint */
#endif

/*
 * The following describe the physical memory configuration.
 *
 *	physmem	 -  The amount of physical memory configured
 *		    in pages.  ptob(physmem) is the amount
 *		    of physical memory in bytes.  Defined in
 *		    .../os/startup.c.
 *
 *	physmax  -  The highest numbered physical page in memory.
 *
 *	maxmem	 -  Maximum available memory, in pages.  Defined
 *		    in main.c.
 *
 *	physinstalled
 *		 -  Pages of physical memory installed;
 *		    includes use by PROM/boot not counted in
 *		    physmem.
 */

pfn_t	physmax;
pgcnt_t	physinstalled;

#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/kmem.h>
#include <sys/sysmacros.h>
#include <sys/bootconf.h>

/*
 * Data for segkmem pages that should be resident
 */
struct vnode kvps[KV_MAX];

/*
 * Data from swapgeneric.c that must be resident.
 */
struct vnode *rootvp;		/* vnode of the root device */
dev_t rootdev;			/* dev_t of the root device */
boolean_t root_is_ramdisk;	/* root is ramdisk */
uint32_t ramdisk_size;		/* (KB) currently set only for sparc netboots */

/*
 * dhcp
 */
#include <sys/socket.h>
#include <sys/errno.h>
#include <sys/sockio.h>
#include <sys/stream.h>
#include <sys/stropts.h>
#include <sys/dlpi.h>
#include <net/if.h>

int netboot;
int obpdebug;
char *dhcack;		/* dhcp response packet */
int dhcacklen;
char *netdev_path;	/* Used to cache the netdev_path handed up by boot */
char dhcifname[IFNAMSIZ];

/*
 * Data from arp.c that must be resident.
 */
#include <net/if_arp.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/if_ether.h>

ether_addr_t etherbroadcastaddr = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};

#include <sys/tty.h>
#include <sys/ptyvar.h>

static void store_fetch_initspace();

/*
 * Allocate tunable structures at runtime.
 */
void
space_init(void)
{
	pty_initspace();
	store_fetch_initspace();
}

int ts_dispatch_extended = -1; /* set in ts_getdptbl or set_platform_default */

/*
 * Previously defined in consmsconf.c ...
 */
dev_t kbddev = NODEV;
dev_t mousedev = NODEV;
dev_t stdindev = NODEV;
dev_t diagdev = NODEV;
struct vnode *wsconsvp;

dev_t fbdev = NODEV;
struct vnode *fbvp;
dev_info_t *fbdip;

/*
 * moved from cons.c because they must be resident in the kernel.
 */
vnode_t	*rconsvp;
dev_t	rconsdev;
dev_t	uconsdev = NODEV;

/*
 * serial virtual console vnode pointer.
 */
vnode_t		*vsconsvp = NULL;

/*
 * Flag whether console fb output is using PROM/PROM emulation
 * terminal emulator, or is using the kernel terminal emulator.
 */
int	consmode = CONS_FW;

/*
 * The following allows systems to disable use of the kernel
 * terminal emulator (retreat to PROM terminal emulator if there
 * is PROM).
 */
int	cons_tem_disable;

/*
 * consconfig() in autoconf.c sets this; it's the vnode of the distinguished
 * keyboard/frame buffer combination, aka the workstation console.
 */
vnode_t *rwsconsvp;
dev_t	rwsconsdev;

/*
 * Platform console abort policy.
 * Platforms may override the default software policy, if such hardware
 * (e.g. keyswitches with a secure position) exists.
 */
int abort_enable = KIOCABORTENABLE;

/* from cpc.c */
uint_t kcpc_key;	/* TSD key for CPU performance counter context */

/*
 * storing and retrieving data by string key
 *
 * this mechanism allows a consumer to store and retrieve by name a pointer
 * to some space maintained by the consumer.
 * For example, a driver or module may want to have persistent data
 * over unloading/loading cycles. The pointer is typically to some
 * kmem_alloced space and it should not be pointing to data that will
 * be destroyed when the module is unloaded.
 */
static mod_hash_t *space_hash;
static char *space_hash_name = "space_hash";
static size_t	space_hash_nchains = 8;

static void
store_fetch_initspace()
{
	space_hash = mod_hash_create_strhash(space_hash_name,
	    space_hash_nchains, mod_hash_null_valdtor);
	ASSERT(space_hash);
}

int
space_store(char *key, uintptr_t ptr)
{
	char *s;
	int rval;
	size_t l;

	/* some sanity checks first */
	if (key == NULL) {
		return (-1);
	}
	l = (size_t)strlen(key);
	if (l == 0) {
		return (-1);
	}

	/* increment for null terminator */
	l++;

	/* alloc space for the string, mod_hash_insert will deallocate */
	s = kmem_alloc(l, KM_SLEEP);
	bcopy(key, s, l);

	rval = mod_hash_insert(space_hash,
	    (mod_hash_key_t)s, (mod_hash_val_t)ptr);

	switch (rval) {
	case 0:
		break;
#ifdef DEBUG
	case MH_ERR_DUPLICATE:
		cmn_err(CE_WARN, "space_store: duplicate key %s", key);
		rval = -1;
		break;
	case MH_ERR_NOMEM:
		cmn_err(CE_WARN, "space_store: no mem for key %s", key);
		rval = -1;
		break;
	default:
		cmn_err(CE_WARN, "space_store: unspecified error for key %s",
		    key);
		rval = -1;
		break;
#else
	default:
		rval = -1;
		break;
#endif
	}

	return (rval);
}

uintptr_t
space_fetch(char *key)
{
	uintptr_t ptr = 0;
	mod_hash_val_t val;
	int rval;

	if (key) {
		rval = mod_hash_find(space_hash, (mod_hash_key_t)key, &val);
		if (rval == 0) {
			ptr = (uintptr_t)val;
		}
	}

	return (ptr);
}

void
space_free(char *key)
{
	if (key) {
		(void) mod_hash_destroy(space_hash, (mod_hash_key_t)key);
	}
}

/*
 * Support for CRC32.  At present all calculations are done in simple
 * macros, so all we need is somewhere to declare the global lookup table.
 */

#include <sys/crc32.h>

const uint32_t crc32_table[256] = { CRC32_TABLE };

/*
 * We need to fanout load from NIC which can overwhelm a single CPU.
 * This becomes especially important on systems having slow CPUs
 * (sun4v architecture). mac_soft_ring_enable is false on all
 * systems except sun4v. On sun4v, they get enabled by default (see
 * sun4v/os/mach_startup.c).
 */
boolean_t	mac_soft_ring_enable = B_FALSE;

/*
 * Global iscsi boot prop
 */
ib_boot_prop_t	*iscsiboot_prop = NULL;