riscv/include/vmparam.h

/*	$NetBSD: vmparam.h,v 1.3 2017/06/24 13:43:36 joerg Exp $	*/

/*-
 * Copyright (c) 2014 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Matt Thomas of 3am Software Foundry.
 *
 * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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 _RISCV_VMPARAM_H_
#define	_RISCV_VMPARAM_H_

#include <riscv/param.h>

#ifdef _KERNEL_OPT
#include "opt_multiprocessor.h"
#endif

/*
 * Machine dependent VM constants for RISCV.
 */

/*
 * We use a 8K page on RV64 and 4K on RV32 systems.
 * Override PAGE_* definitions to compile-time constants.
 */
#define	PAGE_SHIFT	PGSHIFT
#define	PAGE_SIZE	(1 << PAGE_SHIFT)
#define	PAGE_MASK	(PAGE_SIZE - 1)

/*
 * USRSTACK is the top (end) of the user stack.
 *
 * USRSTACK needs to start a page below the maxuser address so that a memory
 * access with a maximum displacement (0x7ff) won't cross into the kernel's
 * address space.  We use PAGE_SIZE instead of 0x800 since these need to be
 * page-aligned.
 */
#define	USRSTACK	(VM_MAXUSER_ADDRESS-PAGE_SIZE) /* Start of user stack */
#define	USRSTACK32	((uint32_t)VM_MAXUSER32_ADDRESS-PAGE_SIZE)

/*
 * Virtual memory related constants, all in bytes
 */
#ifndef MAXTSIZ
#define	MAXTSIZ		(128*1024*1024)		/* max text size */
#endif
#ifndef DFLDSIZ
#define	DFLDSIZ		(256*1024*1024)		/* initial data size limit */
#endif
#ifndef MAXDSIZ
#define	MAXDSIZ		(1536*1024*1024)	/* max data size */
#endif
#ifndef	DFLSSIZ
#define	DFLSSIZ		(16*1024*1024)		/* initial stack size limit */
#endif
#ifndef	MAXSSIZ
#define	MAXSSIZ		(120*1024*1024)		/* max stack size */
#endif

/*
 * Virtual memory related constants, all in bytes
 */
#ifndef MAXTSIZ32
#define	MAXTSIZ32	MAXTSIZ			/* max text size */
#endif
#ifndef DFLDSIZ32
#define	DFLDSIZ32	DFLDSIZ			/* initial data size limit */
#endif
#ifndef MAXDSIZ32
#define	MAXDSIZ32	MAXDSIZ			/* max data size */
#endif
#ifndef	DFLSSIZ32
#define	DFLSSIZ32	DFLTSIZ			/* initial stack size limit */
#endif
#ifndef	MAXSSIZ32
#define	MAXSSIZ32	MAXSSIZ			/* max stack size */
#endif

/*
 * PTEs for mapping user space into the kernel for phyio operations.
 * The default PTE number is enough to cover 8 disks * MAXBSIZE.
 */
#ifndef USRIOSIZE
#define USRIOSIZE	(MAXBSIZE/PAGE_SIZE * 8)
#endif

// user/kernel map constants
// These use negative addresses since RISCV addresses are signed.
#define VM_MIN_ADDRESS		((vaddr_t)0x00000000)
#ifdef _LP64
#define VM_MAXUSER_ADDRESS	((vaddr_t) 1L << 42)	/* 0x0000040000000000 */
// For 64-bit kernels, we could, in theory, have 8TB (42 (13+29) bits worth)
// of KVA space.  We need to divide that between KVA for direct-mapped memory,
// space for I/O devices (someday), the kernel's mapped space.  For now, we are
// going to restrict ourselves to use highest 8GB of KVA. The highest 2GB of
// that KVA will be used to direct map memory.
#define VM_MAX_KERNEL_ADDRESS	((vaddr_t) -PAGE_SIZE << 18)
							/* 0xFFFFFFFF80000000 */
#define VM_MIN_KERNEL_ADDRESS	((vaddr_t) -PAGE_SIZE << 20)
							/* 0xFFFFFFFE00000000 */
#else
#define VM_MAXUSER_ADDRESS	((vaddr_t)-0x7fffffff-1)/* 0xFFFFFFFF80000000 */
// We reserve the bottom (nonnegative) address for user, then split the upper
// 2GB into two 1GB, the lower for mapped KVA and the upper for direct-mapped.
#define VM_MIN_KERNEL_ADDRESS	((vaddr_t)-0x7fffffff-1)/* 0xFFFFFFFF80000000 */
#define VM_MAX_KERNEL_ADDRESS	((vaddr_t)-0x40000000)	/* 0xFFFFFFFFC0000000 */
#endif
#define VM_MAX_ADDRESS		VM_MAXUSER_ADDRESS
#define VM_MAXUSER32_ADDRESS	((vaddr_t)(1UL << 31))/* 0x0000000080000000 */

/*
 * The address to which unspecified mapping requests default
 */
#define __USE_TOPDOWN_VM

#define VM_DEFAULT_ADDRESS_TOPDOWN(da, sz) \
    trunc_page(USRSTACK - MAXSSIZ - (sz) - user_stack_guard_size)
#define VM_DEFAULT_ADDRESS_BOTTOMUP(da, sz) \
    round_page((vaddr_t)(da) + (vsize_t)maxdmap)

#define VM_DEFAULT_ADDRESS32_TOPDOWN(da, sz) \
    trunc_page(USRSTACK32 - MAXSSIZ32 - (sz) - user_stack_guard_size)
#define VM_DEFAULT_ADDRESS32_BOTTOMUP(da, sz) \
    round_page((vaddr_t)(da) + (vsize_t)MAXDSIZ32)

/* virtual sizes (bytes) for various kernel submaps */
#define VM_PHYS_SIZE		(USRIOSIZE*PAGE_SIZE)

/* VM_PHYSSEG_MAX defined by platform-dependent code. */
#ifndef VM_PHYSSEG_MAX
#define VM_PHYSSEG_MAX		1
#endif
#if VM_PHYSSEG_MAX == 1
#define	VM_PHYSSEG_STRAT	VM_PSTRAT_LINEAR
#else
#define	VM_PHYSSEG_STRAT	VM_PSTRAT_BSEARCH
#endif
#define	VM_PHYSSEG_NOADD	/* can add RAM after vm_mem_init */

#ifndef VM_NFREELIST
#define	VM_NFREELIST		2	/* 2 distinct memory segments */
#define VM_FREELIST_DEFAULT	0
#define VM_FREELIST_DIRECTMAP	1
#endif

#ifdef _KERNEL
#define	UVM_KM_VMFREELIST	riscv_poolpage_vmfreelist
extern int riscv_poolpage_vmfreelist;

#ifdef _LP64
void *	cpu_uarea_alloc(bool);
bool	cpu_uarea_free(void *);
#endif
#endif

#endif /* ! _RISCV_VMPARAM_H_ */