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      1 /* $NetBSD: vmparam.h,v 1.21 2024/06/30 09:36:43 jmcneill Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2014 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Matt Thomas of 3am Software Foundry.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifndef _AARCH64_VMPARAM_H_
     33 #define _AARCH64_VMPARAM_H_
     34 
     35 #ifdef __aarch64__
     36 
     37 #define	__USE_TOPDOWN_VM
     38 
     39 /*
     40  * Default pager_map of 16MB is small and we have plenty of VA to burn.
     41  */
     42 #define	PAGER_MAP_DEFAULT_SIZE	(512 * 1024 * 1024)
     43 
     44 /*
     45  * Defaults for Unified Buffer Cache parameters.
     46  */
     47 
     48 #ifndef UBC_WINSHIFT
     49 #define	UBC_WINSHIFT	16	/* 64kB */
     50 #endif
     51 #ifndef UBC_NWINS
     52 #define	UBC_NWINS	4096	/* 256MB */
     53 #endif
     54 
     55 /*
     56  * AARCH64 supports 3 page sizes: 4KB, 16KB, 64KB.  Each page table can
     57  * even have its own page size.
     58  */
     59 
     60 #ifdef AARCH64_PAGE_SHIFT
     61 #if (1 << AARCH64_PAGE_SHIFT) & ~0x141000
     62 #error AARCH64_PAGE_SHIFT contains an unsupported value.
     63 #endif
     64 #define PAGE_SHIFT	AARCH64_PAGE_SHIFT
     65 #else
     66 #define PAGE_SHIFT	12
     67 #endif
     68 #define PAGE_SIZE	(1 << PAGE_SHIFT)
     69 #define PAGE_MASK	(PAGE_SIZE - 1)
     70 
     71 #if PAGE_SHIFT <= 14
     72 #define USPACE		32768
     73 #else
     74 #define USPACE		65536
     75 #endif
     76 #define	UPAGES		(USPACE >> PAGE_SHIFT)
     77 
     78 /*
     79  * USRSTACK is the top (end) of the user stack.  The user VA space is a
     80  * 48-bit address space starting at 0.  Place the stack at its top end.
     81  */
     82 #define USRSTACK	VM_MAXUSER_ADDRESS
     83 
     84 #ifndef MAXTSIZ
     85 #define	MAXTSIZ		(1L << 30)	/* max text size (1GB) */
     86 #endif
     87 
     88 #ifndef MAXDSIZ
     89 #define	MAXDSIZ		(1L << 36)	/* max data size (64GB) */
     90 #endif
     91 
     92 #ifndef MAXSSIZ
     93 #define	MAXSSIZ		(1L << 26)	/* max stack size (64MB) */
     94 #endif
     95 
     96 #ifndef DFLDSIZ
     97 #define	DFLDSIZ		(1L << 32)	/* default data size (4GB) */
     98 #endif
     99 
    100 #ifndef DFLSSIZ
    101 #define	DFLSSIZ		(1L << 23)	/* default stack size (8MB) */
    102 #endif
    103 
    104 #define USRSTACK32	VM_MAXUSER_ADDRESS32
    105 
    106 #ifndef	MAXDSIZ32
    107 #define	MAXDSIZ32	(3U*1024*1024*1024)	/* max data size */
    108 #endif
    109 
    110 #ifndef	MAXSSIZ32
    111 #define	MAXSSIZ32	(64*1024*1024)		/* max stack size */
    112 #endif
    113 
    114 #ifndef DFLDSIZ32
    115 #define	DFLDSIZ32	(1L << 27)	/* 32bit default data size (128MB) */
    116 #endif
    117 
    118 #ifndef DFLSSIZ32
    119 #define	DFLSSIZ32	(1L << 21)	/* 32bit default stack size (2MB) */
    120 #endif
    121 
    122 #define	VM_MIN_ADDRESS		((vaddr_t) 0x0)
    123 #define	VM_MAXUSER_ADDRESS	((vaddr_t) (1L << 48) - PAGE_SIZE)
    124 #define	VM_MAX_ADDRESS		VM_MAXUSER_ADDRESS
    125 
    126 #define VM_MAXUSER_ADDRESS32	((vaddr_t) 0xfffff000)
    127 
    128 /*
    129  * kernel virtual space layout:
    130  *   0xffff_0000_0000_0000  -   64T  direct mapping
    131  *   0xffff_4000_0000_0000  -   32T  (KASAN SHADOW MAP)
    132  *   0xffff_6000_0000_0000  -   32T  (not used)
    133  *   0xffff_8000_0000_0000  -    1G  (EFI_RUNTIME - legacy)
    134  *   0xffff_8000_4000_0000  -   64T  (not used)
    135  *   0xffff_c000_0000_0000  -   64T  KERNEL VM Space (including text/data/bss)
    136  *  (0xffff_c000_4000_0000     -1GB) KERNEL VM start of KVM
    137  *   0xffff_ffff_f000_0000  -  254M  KERNEL_IO for pmap_devmap
    138  *   0xffff_ffff_ffe0_0000  -    2M  RESERVED
    139  */
    140 #define VM_MIN_KERNEL_ADDRESS	((vaddr_t) 0xffffc00000000000L)
    141 #define VM_MAX_KERNEL_ADDRESS	((vaddr_t) 0xffffffffffe00000L)
    142 
    143 /*
    144  * Reserved space for EFI runtime services (legacy)
    145  */
    146 #define	EFI_RUNTIME_VA		0xffff800000000000L
    147 #define	EFI_RUNTIME_SIZE	0x0000000040000000L
    148 
    149 
    150 /*
    151  * last 254MB of kernel vm area (0xfffffffff0000000-0xffffffffffe00000)
    152  * may be used for devmap.  see aarch64/pmap.c:pmap_devmap_*
    153  */
    154 #define VM_KERNEL_IO_BASE	0xfffffffff0000000L
    155 #define VM_KERNEL_IO_SIZE	(VM_MAX_KERNEL_ADDRESS - VM_KERNEL_IO_BASE)
    156 
    157 #define VM_KERNEL_VM_BASE	(0xffffc00040000000L)
    158 #define VM_KERNEL_VM_SIZE	(VM_KERNEL_IO_BASE - VM_KERNEL_VM_BASE)
    159 
    160 /* virtual sizes (bytes) for various kernel submaps */
    161 #define USRIOSIZE		(PAGE_SIZE / 8)
    162 #define VM_PHYS_SIZE		(USRIOSIZE * PAGE_SIZE)
    163 
    164 #define VM_DEFAULT_ADDRESS32_TOPDOWN(da, sz) \
    165 	trunc_page(USRSTACK32 - MAXSSIZ32 - (sz) - user_stack_guard_size)
    166 #define VM_DEFAULT_ADDRESS32_BOTTOMUP(da, sz) \
    167 	round_page((vaddr_t)(da) + (vsize_t)MAXDSIZ32)
    168 
    169 /*
    170  * Since we have the address space, we map all of physical memory (RAM)
    171  * using block page table entries.
    172  */
    173 #define AARCH64_DIRECTMAP_MASK	((vaddr_t) 0xffff000000000000L)
    174 #define AARCH64_DIRECTMAP_SIZE	(1UL << 46)	/* 64TB */
    175 #define AARCH64_DIRECTMAP_START	AARCH64_DIRECTMAP_MASK
    176 #define AARCH64_DIRECTMAP_END	(AARCH64_DIRECTMAP_START + AARCH64_DIRECTMAP_SIZE)
    177 #define AARCH64_KVA_P(va)	(((vaddr_t) (va) & AARCH64_DIRECTMAP_MASK) != 0)
    178 #define AARCH64_PA_TO_KVA(pa)	((vaddr_t) ((pa) | AARCH64_DIRECTMAP_START))
    179 #define AARCH64_KVA_TO_PA(va)	((paddr_t) ((va) & ~AARCH64_DIRECTMAP_MASK))
    180 
    181 /* */
    182 #define VM_PHYSSEG_MAX		256              /* XXX */
    183 #define VM_PHYSSEG_STRAT	VM_PSTRAT_BSEARCH
    184 
    185 #define VM_NFREELIST		1
    186 #define VM_FREELIST_DEFAULT	0
    187 
    188 #elif defined(__arm__)
    189 
    190 #include <arm/vmparam.h>
    191 
    192 #endif /* __aarch64__/__arm__ */
    193 
    194 #endif /* _AARCH64_VMPARAM_H_ */
    195