NetBSD/sys/arch/riscv/include/vmparam.h

180 lines
5.9 KiB
C

/* $NetBSD: vmparam.h,v 1.1 2014/09/19 17:36:26 matt 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))
#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))
#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_ */