/*
 * Copyright (c) 2006 The DragonFly Project.  All rights reserved.
 *
 * This code is derived from software contributed to The DragonFly Project
 * by Matthew Dillon <dillon@backplane.com>
 *
 * 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.
 * 3. Neither the name of The DragonFly Project nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific, prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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
 * COPYRIGHT HOLDERS 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.
 *
 * $DragonFly: src/sys/platform/vkernel/include/vmparam.h,v 1.5 2007/01/14 00:01:07 dillon Exp $
 */

#ifndef _MACHINE_VMPARAM_H_
#define _MACHINE_VMPARAM_H_

/*
 * Indicate that read access also means execution access (XXX newer PCs
 * have a separate bit).
 */
#define VM_PROT_READ_IS_EXEC

/*
 * Virtual memory related constants, all in bytes
 */
#define	MAXTSIZ		(32UL*1024*1024*1024)	/* max text size */

#ifndef DFLDSIZ
#define	DFLDSIZ		(128UL*1024*1024)	/* initial data size limit */
#endif
#ifndef MAXDSIZ
#define	MAXDSIZ		(32UL*1024*1024*1024)	/* max data size */
#endif
#ifndef	DFLSSIZ
#define	DFLSSIZ		(8UL*1024*1024)		/* initial stack size limit */
#endif
#ifndef	MAXSSIZ
#define	MAXSSIZ		(512UL*1024*1024)	/* max stack size */
#endif
#ifndef	MAXTHRSSIZ
#define	MAXTHRSSIZ	(128UL*1024*1024*1024) /* thread stack area */
#endif
#ifndef SGROWSIZ
#define	SGROWSIZ	(128UL*1024)		/* amount to grow stack */
#endif

/*
 * After this period of time allow a process to become swappable.  This
 * parameter is mostly obsolete now.
 */
#define	MAXSLP 		20

/*
 * For virtual kernels running as userland processes the user and kernel
 * address spaces exist in different VM spaces and can overlap.
 */
#define KERNEL_KVA_START	(512ULL << 30)	/* From 512GB */
#define KERNEL_KVA_SIZE		(512UL * 1024 * 1024 * 1024)
#define KERNEL_STACK_SIZE	(512 * PAGE_SIZE)

#define VKERNEL_USEABLE_PHYS_RAM_BASE (128ULL << 30) /* from 32GB */

/*
 * Do not allow the top 2MB of the user stack to be mapped to work around
 * an AMD bug wherein the cpu can lockup or destabilize if the instruction
 * prefetcher crosses over into non-canonical address space.  Only the top
 * 4KB needs to be disallowed, but taking out the whole 2MB allows potential
 * 2MB PTE optimizations to be retained.
 */
#define VM_MIN_USER_ADDRESS	((vm_offset_t)0)
#define VM_MAX_USER_ADDRESS	UVADDR(NUPML4E - 1, NPDPEPG - 1, NPDEPG - 1, 0)

#define DMAP_SIZE		(512UL * 1024 * 1024 * 1024)

#define KERNBASE		0xC0000000	/* XXX totally wrong */

#define USRSTACK		VM_MAX_USER_ADDRESS

extern void *dmap_min_address;
#define	PHYS_TO_DMAP(x)		((uint64_t)(x) + (uint64_t)dmap_min_address)
#define	DMAP_TO_PHYS(x)		((uint64_t)(x) - (uint64_t)dmap_min_address)

/*
 * Initial memory map preload
 */
#ifndef VM_INITIAL_PAGEIN
#define	VM_INITIAL_PAGEIN	16
#endif

#endif /* _MACHINE_VMPARAM_H_ */