180 lines
5.9 KiB
C
180 lines
5.9 KiB
C
/* $NetBSD: vmparam.h,v 1.1 2014/09/19 17:36:26 matt Exp $ */
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/*-
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* Copyright (c) 2014 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Matt Thomas of 3am Software Foundry.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _RISCV_VMPARAM_H_
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#define _RISCV_VMPARAM_H_
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#include <riscv/param.h>
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#ifdef _KERNEL_OPT
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#include "opt_multiprocessor.h"
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#endif
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/*
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* Machine dependent VM constants for RISCV.
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*/
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/*
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* We use a 8K page on RV64 and 4K on RV32 systems.
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* Override PAGE_* definitions to compile-time constants.
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*/
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#define PAGE_SHIFT PGSHIFT
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#define PAGE_SIZE (1 << PAGE_SHIFT)
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#define PAGE_MASK (PAGE_SIZE - 1)
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/*
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* USRSTACK is the top (end) of the user stack.
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*
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* USRSTACK needs to start a page below the maxuser address so that a memory
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* access with a maximum displacement (0x7ff) won't cross into the kernel's
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* address space. We use PAGE_SIZE instead of 0x800 since these need to be
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* page-aligned.
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*/
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#define USRSTACK (VM_MAXUSER_ADDRESS-PAGE_SIZE) /* Start of user stack */
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#define USRSTACK32 ((uint32_t)VM_MAXUSER32_ADDRESS-PAGE_SIZE)
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/*
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* Virtual memory related constants, all in bytes
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*/
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#ifndef MAXTSIZ
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#define MAXTSIZ (128*1024*1024) /* max text size */
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#endif
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#ifndef DFLDSIZ
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#define DFLDSIZ (256*1024*1024) /* initial data size limit */
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#endif
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#ifndef MAXDSIZ
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#define MAXDSIZ (1536*1024*1024) /* max data size */
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#endif
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#ifndef DFLSSIZ
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#define DFLSSIZ (16*1024*1024) /* initial stack size limit */
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#endif
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#ifndef MAXSSIZ
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#define MAXSSIZ (120*1024*1024) /* max stack size */
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#endif
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/*
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* Virtual memory related constants, all in bytes
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*/
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#ifndef MAXTSIZ32
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#define MAXTSIZ32 MAXTSIZ /* max text size */
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#endif
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#ifndef DFLDSIZ32
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#define DFLDSIZ32 DFLDSIZ /* initial data size limit */
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#endif
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#ifndef MAXDSIZ32
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#define MAXDSIZ32 MAXDSIZ /* max data size */
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#endif
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#ifndef DFLSSIZ32
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#define DFLSSIZ32 DFLTSIZ /* initial stack size limit */
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#endif
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#ifndef MAXSSIZ32
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#define MAXSSIZ32 MAXSSIZ /* max stack size */
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#endif
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/*
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* PTEs for mapping user space into the kernel for phyio operations.
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* The default PTE number is enough to cover 8 disks * MAXBSIZE.
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*/
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#ifndef USRIOSIZE
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#define USRIOSIZE (MAXBSIZE/PAGE_SIZE * 8)
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#endif
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// user/kernel map constants
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// These use negative addresses since RISCV addresses are signed.
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#define VM_MIN_ADDRESS ((vaddr_t)0x00000000)
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#ifdef _LP64
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#define VM_MAXUSER_ADDRESS ((vaddr_t) 1L << 42) /* 0x0000040000000000 */
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// For 64-bit kernels, we could, in theory, have 8TB (42 (13+29) bits worth)
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// of KVA space. We need to divide that between KVA for direct-mapped memory,
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// space for I/O devices (someday), the kernel's mapped space. For now, we are
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// going to restrict ourselves to use highest 8GB of KVA. The highest 2GB of
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// that KVA will be used to direct map memory.
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#define VM_MAX_KERNEL_ADDRESS ((vaddr_t) -PAGE_SIZE << 18)
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/* 0xFFFFFFFF80000000 */
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#define VM_MIN_KERNEL_ADDRESS ((vaddr_t) -PAGE_SIZE << 20)
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/* 0xFFFFFFFE00000000 */
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#else
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#define VM_MAXUSER_ADDRESS ((vaddr_t)-0x7fffffff-1)/* 0xFFFFFFFF80000000 */
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// We reserve the bottom (nonnegative) address for user, then split the upper
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// 2GB into two 1GB, the lower for mapped KVA and the upper for direct-mapped.
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#define VM_MIN_KERNEL_ADDRESS ((vaddr_t)-0x7fffffff-1)/* 0xFFFFFFFF80000000 */
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#define VM_MAX_KERNEL_ADDRESS ((vaddr_t)-0x40000000) /* 0xFFFFFFFFC0000000 */
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#endif
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#define VM_MAX_ADDRESS VM_MAXUSER_ADDRESS
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#define VM_MAXUSER32_ADDRESS ((vaddr_t)(1UL << 31))/* 0x0000000080000000 */
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/*
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* The address to which unspecified mapping requests default
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*/
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#define __USE_TOPDOWN_VM
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#define VM_DEFAULT_ADDRESS_TOPDOWN(da, sz) \
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trunc_page(USRSTACK - MAXSSIZ - (sz))
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#define VM_DEFAULT_ADDRESS_BOTTOMUP(da, sz) \
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round_page((vaddr_t)(da) + (vsize_t)maxdmap)
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#define VM_DEFAULT_ADDRESS32_TOPDOWN(da, sz) \
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trunc_page(USRSTACK32 - MAXSSIZ32 - (sz))
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#define VM_DEFAULT_ADDRESS32_BOTTOMUP(da, sz) \
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round_page((vaddr_t)(da) + (vsize_t)MAXDSIZ32)
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/* virtual sizes (bytes) for various kernel submaps */
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#define VM_PHYS_SIZE (USRIOSIZE*PAGE_SIZE)
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/* VM_PHYSSEG_MAX defined by platform-dependent code. */
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#ifndef VM_PHYSSEG_MAX
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#define VM_PHYSSEG_MAX 1
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#endif
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#if VM_PHYSSEG_MAX == 1
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#define VM_PHYSSEG_STRAT VM_PSTRAT_LINEAR
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#else
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#define VM_PHYSSEG_STRAT VM_PSTRAT_BSEARCH
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#endif
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#define VM_PHYSSEG_NOADD /* can add RAM after vm_mem_init */
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#ifndef VM_NFREELIST
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#define VM_NFREELIST 2 /* 2 distinct memory segments */
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#define VM_FREELIST_DEFAULT 0
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#define VM_FREELIST_DIRECTMAP 1
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#endif
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#ifdef _KERNEL
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#define UVM_KM_VMFREELIST riscv_poolpage_vmfreelist
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extern int riscv_poolpage_vmfreelist;
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#ifdef _LP64
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void * cpu_uarea_alloc(bool);
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bool cpu_uarea_free(void *);
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#endif
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#endif
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#endif /* ! _RISCV_VMPARAM_H_ */
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