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/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
* Copyright (c) 1994 John S. Dyson
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* 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 University 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 REGENTS 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 REGENTS 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.
* from: FreeBSD: src/sys/i386/include/vmparam.h,v 1.33 2000/03/30
*/
#ifndef _MACHINE_VMPARAM_H_
#define _MACHINE_VMPARAM_H_
/*
* Virtual memory related constants, all in bytes
*/
#ifndef MAXTSIZ
#define MAXTSIZ (1*1024*1024*1024) /* max text size */
#endif
#ifndef DFLDSIZ
#define DFLDSIZ (128*1024*1024) /* initial data size limit */
#endif
#ifndef MAXDSIZ
#define MAXDSIZ (1*1024*1024*1024) /* max data size */
#endif
#ifndef DFLSSIZ
#define DFLSSIZ (128*1024*1024) /* initial stack size limit */
#endif
#ifndef MAXSSIZ
#define MAXSSIZ (1*1024*1024*1024) /* max stack size */
#endif
#ifndef SGROWSIZ
#define SGROWSIZ (128*1024) /* amount to grow stack */
#endif
/*
* The physical address space is sparsely populated.
*/
#define VM_PHYSSEG_SPARSE
/*
* The number of PHYSSEG entries.
*/
#define VM_PHYSSEG_MAX 64
/*
* Create two free page pools: VM_FREEPOOL_DEFAULT is the default pool
* from which physical pages are allocated and VM_FREEPOOL_DIRECT is
* the pool from which physical pages for small UMA objects are
* allocated.
*/
#define VM_NFREEPOOL 2
#define VM_FREEPOOL_DEFAULT 0
#define VM_FREEPOOL_DIRECT 1
/*
* Create one free page list: VM_FREELIST_DEFAULT is for all physical
* pages.
*/
#define VM_NFREELIST 1
#define VM_FREELIST_DEFAULT 0
/*
* An allocation size of 16MB is supported in order to optimize the
* use of the direct map by UMA. Specifically, a cache line contains
* at most four TTEs, collectively mapping 16MB of physical memory.
* By reducing the number of distinct 16MB "pages" that are used by UMA,
* the physical memory allocator reduces the likelihood of both 4MB
* page TLB misses and cache misses caused by 4MB page TLB misses.
*/
#define VM_NFREEORDER 12
/*
* Enable superpage reservations: 1 level.
*/
#ifndef VM_NRESERVLEVEL
#define VM_NRESERVLEVEL 1
#endif
/*
* Level 0 reservations consist of 512 pages.
*/
#ifndef VM_LEVEL_0_ORDER
#define VM_LEVEL_0_ORDER 9
#endif
/**
* Address space layout.
*
* RISC-V implements multiple paging modes with different virtual address space
* sizes: SV32, SV39, SV48 and SV57. Only SV39 and SV48 are supported by
* FreeBSD. SV39 provides a 512GB virtual address space and uses three-level
* page tables, while SV48 provides a 256TB virtual address space and uses
* four-level page tables. 64-bit RISC-V implementations are required to provide
* at least SV39 mode; locore initially enables SV39 mode while bootstrapping
* page tables, and pmap_bootstrap() optionally switches to SV48 mode.
*
* The address space is split into two regions at each end of the 64-bit address
* space; the lower region is for use by user mode software, while the upper
* region is used for various kernel maps. The kernel map layout in SV48 mode
* is currently identical to that used in SV39 mode.
*
* SV39 memory map:
* 0x0000000000000000 - 0x0000003fffffffff 256GB user map
* 0x0000004000000000 - 0xffffffbfffffffff unmappable
* 0xffffffc000000000 - 0xffffffc7ffffffff 32GB kernel map
* 0xffffffc800000000 - 0xffffffcfffffffff 32GB unused
* 0xffffffd000000000 - 0xffffffefffffffff 128GB direct map
* 0xfffffff000000000 - 0xffffffffffffffff 64GB unused
*
* SV48 memory map:
* 0x0000000000000000 - 0x00007fffffffffff 128TB user map
* 0x0000800000000000 - 0xffff7fffffffffff unmappable
* 0xffff800000000000 - 0xffffffc7ffffffff 127.75TB hole
* 0xffffffc000000000 - 0xffffffc7ffffffff 32GB kernel map
* 0xffffffc800000000 - 0xffffffcfffffffff 32GB unused
* 0xffffffd000000000 - 0xffffffefffffffff 128GB direct map
* 0xfffffff000000000 - 0xffffffffffffffff 64GB unused
*
* The kernel is loaded at the beginning of the kernel map.
*
* We define some interesting address constants:
*
* VM_MIN_ADDRESS and VM_MAX_ADDRESS define the start and end of the entire
* 64 bit address space, mostly just for convenience.
*
* VM_MIN_KERNEL_ADDRESS and VM_MAX_KERNEL_ADDRESS define the start and end of
* mappable kernel virtual address space.
*
* VM_MIN_USER_ADDRESS and VM_MAX_USER_ADDRESS define the start and end of the
* user address space.
*/
#define VM_MIN_ADDRESS (0x0000000000000000UL)
#define VM_MAX_ADDRESS (0xffffffffffffffffUL)
#define VM_MIN_KERNEL_ADDRESS (0xffffffc000000000UL)
#define VM_MAX_KERNEL_ADDRESS (0xffffffc800000000UL)
#define DMAP_MIN_ADDRESS (0xffffffd000000000UL)
#define DMAP_MAX_ADDRESS (0xfffffff000000000UL)
#define DMAP_MIN_PHYSADDR (dmap_phys_base)
#define DMAP_MAX_PHYSADDR (dmap_phys_max)
/* True if pa is in the dmap range */
#define PHYS_IN_DMAP(pa) ((pa) >= DMAP_MIN_PHYSADDR && \
(pa) < DMAP_MAX_PHYSADDR)
/* True if va is in the dmap range */
#define VIRT_IN_DMAP(va) ((va) >= DMAP_MIN_ADDRESS && \
(va) < (dmap_max_addr))
#define PMAP_HAS_DMAP 1
#define PHYS_TO_DMAP(pa) \
({ \
KASSERT(PHYS_IN_DMAP(pa), \
("%s: PA out of range, PA: 0x%lx", __func__, \
(vm_paddr_t)(pa))); \
((pa) - dmap_phys_base) + DMAP_MIN_ADDRESS; \
})
#define DMAP_TO_PHYS(va) \
({ \
KASSERT(VIRT_IN_DMAP(va), \
("%s: VA out of range, VA: 0x%lx", __func__, \
(vm_offset_t)(va))); \
((va) - DMAP_MIN_ADDRESS) + dmap_phys_base; \
})
#define VM_MIN_USER_ADDRESS (0x0000000000000000UL)
#define VM_MAX_USER_ADDRESS_SV39 (0x0000004000000000UL)
#define VM_MAX_USER_ADDRESS_SV48 (0x0000800000000000UL)
#define VM_MAX_USER_ADDRESS VM_MAX_USER_ADDRESS_SV48
#define VM_MINUSER_ADDRESS (VM_MIN_USER_ADDRESS)
#define VM_MAXUSER_ADDRESS (VM_MAX_USER_ADDRESS)
#define KERNBASE (VM_MIN_KERNEL_ADDRESS)
#define SHAREDPAGE_SV39 (VM_MAX_USER_ADDRESS_SV39 - PAGE_SIZE)
#define SHAREDPAGE_SV48 (VM_MAX_USER_ADDRESS_SV48 - PAGE_SIZE)
#define SHAREDPAGE SHAREDPAGE_SV48
#define USRSTACK_SV39 SHAREDPAGE_SV39
#define USRSTACK_SV48 SHAREDPAGE_SV48
#define USRSTACK USRSTACK_SV48
#define PS_STRINGS_SV39 (USRSTACK_SV39 - sizeof(struct ps_strings))
#define PS_STRINGS_SV48 (USRSTACK_SV48 - sizeof(struct ps_strings))
/*
* How many physical pages per kmem arena virtual page.
*/
#ifndef VM_KMEM_SIZE_SCALE
#define VM_KMEM_SIZE_SCALE (1)
#endif
/*
* Optional ceiling (in bytes) on the size of the kmem arena: 60% of the
* kernel map.
*/
#ifndef VM_KMEM_SIZE_MAX
#define VM_KMEM_SIZE_MAX ((VM_MAX_KERNEL_ADDRESS - \
VM_MIN_KERNEL_ADDRESS + 1) * 3 / 5)
#endif
/*
* Initial pagein size of beginning of executable file.
*/
#ifndef VM_INITIAL_PAGEIN
#define VM_INITIAL_PAGEIN 16
#endif
#define UMA_USE_DMAP
#ifndef LOCORE
extern vm_paddr_t dmap_phys_base;
extern vm_paddr_t dmap_phys_max;
extern vm_offset_t dmap_max_addr;
#endif
#define ZERO_REGION_SIZE (64 * 1024) /* 64KB */
/*
* The top of KVA is reserved for early device mappings.
*/
#define DEVMAP_MAX_VADDR VM_MAX_KERNEL_ADDRESS
#define DEVMAP_MIN_VADDR (DEVMAP_MAX_VADDR - PMAP_MAPDEV_EARLY_SIZE)
#define PMAP_MAPDEV_EARLY_SIZE (4 * L2_SIZE)
/*
* No non-transparent large page support in the pmap.
*/
#define PMAP_HAS_LARGEPAGES 0
/*
* Need a page dump array for minidump.
*/
#define MINIDUMP_PAGE_TRACKING 1
#define MINIDUMP_STARTUP_PAGE_TRACKING 1
#endif /* !_MACHINE_VMPARAM_H_ */
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