2 * Copyright (c) 1990 The Regents of the University of California.
4 * Copyright (c) 1994 John S. Dyson
7 * This code is derived from software contributed to Berkeley by
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * from: @(#)vmparam.h 5.9 (Berkeley) 5/12/91
35 * from: FreeBSD: src/sys/i386/include/vmparam.h,v 1.33 2000/03/30
40 #include <arm/vmparam.h>
43 #ifndef _MACHINE_VMPARAM_H_
44 #define _MACHINE_VMPARAM_H_
47 * Virtual memory related constants, all in bytes
50 #define MAXTSIZ (1*1024*1024*1024) /* max text size */
53 #define DFLDSIZ (128*1024*1024) /* initial data size limit */
56 #define MAXDSIZ (1*1024*1024*1024) /* max data size */
59 #define DFLSSIZ (128*1024*1024) /* initial stack size limit */
62 #define MAXSSIZ (1*1024*1024*1024) /* max stack size */
65 #define SGROWSIZ (128*1024) /* amount to grow stack */
69 * The physical address space is sparsely populated.
71 #define VM_PHYSSEG_SPARSE
74 * The number of PHYSSEG entries.
76 #define VM_PHYSSEG_MAX 64
79 * Create two free page pools: VM_FREEPOOL_DEFAULT is the default pool
80 * from which physical pages are allocated and VM_FREEPOOL_DIRECT is
81 * the pool from which physical pages for small UMA objects are
84 #define VM_NFREEPOOL 2
85 #define VM_FREEPOOL_DEFAULT 0
86 #define VM_FREEPOOL_DIRECT 1
89 * Create one free page lists: VM_FREELIST_DEFAULT is for all physical
92 #define VM_NFREELIST 1
93 #define VM_FREELIST_DEFAULT 0
96 * When PAGE_SIZE is 4KB, an allocation size of 16MB is supported in order
97 * to optimize the use of the direct map by UMA. Specifically, a 64-byte
98 * cache line contains at most 8 L2 BLOCK entries, collectively mapping 16MB
99 * of physical memory. By reducing the number of distinct 16MB "pages" that
100 * are used by UMA, the physical memory allocator reduces the likelihood of
101 * both 2MB page TLB misses and cache misses during the page table walk when
102 * a 2MB page TLB miss does occur.
104 #define VM_NFREEORDER 13
107 * Enable superpage reservations: 1 level.
109 #ifndef VM_NRESERVLEVEL
110 #define VM_NRESERVLEVEL 1
114 * Level 0 reservations consist of 512 pages.
116 #ifndef VM_LEVEL_0_ORDER
117 #define VM_LEVEL_0_ORDER 9
121 * Address space layout.
123 * ARMv8 implements up to a 48 bit virtual address space. The address space is
124 * split into 2 regions at each end of the 64 bit address space, with an
125 * out of range "hole" in the middle.
127 * We use the full 48 bits for each region, however the kernel may only use
128 * a limited range within this space.
130 * Upper region: 0xffffffffffffffff Top of virtual memory
132 * 0xfffffeffffffffff End of DMAP
133 * 0xffffa00000000000 Start of DMAP
135 * 0xffff009fffffffff End of KASAN shadow map
136 * 0xffff008000000000 Start of KASAN shadow map
138 * 0xffff007fffffffff End of KVA
139 * 0xffff000000000000 Kernel base address & start of KVA
141 * Hole: 0xfffeffffffffffff
144 * Lower region: 0x0000ffffffffffff End of user address space
145 * 0x0000000000000000 Start of user address space
147 * We use the upper region for the kernel, and the lower region for userland.
149 * We define some interesting address constants:
151 * VM_MIN_ADDRESS and VM_MAX_ADDRESS define the start and end of the entire
152 * 64 bit address space, mostly just for convenience.
154 * VM_MIN_KERNEL_ADDRESS and VM_MAX_KERNEL_ADDRESS define the start and end of
155 * mappable kernel virtual address space.
157 * VM_MIN_USER_ADDRESS and VM_MAX_USER_ADDRESS define the start and end of the
158 * user address space.
160 #define VM_MIN_ADDRESS (0x0000000000000000UL)
161 #define VM_MAX_ADDRESS (0xffffffffffffffffUL)
163 /* 512 GiB of kernel addresses */
164 #define VM_MIN_KERNEL_ADDRESS (0xffff000000000000UL)
165 #define VM_MAX_KERNEL_ADDRESS (0xffff008000000000UL)
167 /* 128 GiB KASAN shadow map */
168 #define KASAN_MIN_ADDRESS (0xffff008000000000UL)
169 #define KASAN_MAX_ADDRESS (0xffff00a000000000UL)
171 /* The address bits that hold a pointer authentication code */
172 #define PAC_ADDR_MASK (0xff7f000000000000UL)
174 /* If true addr is in the kernel address space */
175 #define ADDR_IS_KERNEL(addr) (((addr) & (1ul << 55)) == (1ul << 55))
176 /* If true addr is in its canonical form (i.e. no TBI, PAC, etc.) */
177 #define ADDR_IS_CANONICAL(addr) \
178 (((addr) & 0xffff000000000000UL) == 0 || \
179 ((addr) & 0xffff000000000000UL) == 0xffff000000000000UL)
180 #define ADDR_MAKE_CANONICAL(addr) ({ \
181 __typeof(addr) _tmp_addr = (addr); \
183 _tmp_addr &= ~0xffff000000000000UL; \
184 if (ADDR_IS_KERNEL(addr)) \
185 _tmp_addr |= 0xffff000000000000UL; \
190 /* 95 TiB maximum for the direct map region */
191 #define DMAP_MIN_ADDRESS (0xffffa00000000000UL)
192 #define DMAP_MAX_ADDRESS (0xffffff0000000000UL)
194 #define DMAP_MIN_PHYSADDR (dmap_phys_base)
195 #define DMAP_MAX_PHYSADDR (dmap_phys_max)
197 /* True if pa is in the dmap range */
198 #define PHYS_IN_DMAP(pa) ((pa) >= DMAP_MIN_PHYSADDR && \
199 (pa) < DMAP_MAX_PHYSADDR)
200 /* True if va is in the dmap range */
201 #define VIRT_IN_DMAP(va) ((va) >= DMAP_MIN_ADDRESS && \
202 (va) < (dmap_max_addr))
204 #define PMAP_HAS_DMAP 1
205 #define PHYS_TO_DMAP(pa) \
207 KASSERT(PHYS_IN_DMAP(pa), \
208 ("%s: PA out of range, PA: 0x%lx", __func__, \
209 (vm_paddr_t)(pa))); \
210 ((pa) - dmap_phys_base) + DMAP_MIN_ADDRESS; \
213 #define DMAP_TO_PHYS(va) \
215 KASSERT(VIRT_IN_DMAP(va), \
216 ("%s: VA out of range, VA: 0x%lx", __func__, \
217 (vm_offset_t)(va))); \
218 ((va) - DMAP_MIN_ADDRESS) + dmap_phys_base; \
221 #define VM_MIN_USER_ADDRESS (0x0000000000000000UL)
222 #define VM_MAX_USER_ADDRESS (0x0001000000000000UL)
224 #define VM_MINUSER_ADDRESS (VM_MIN_USER_ADDRESS)
225 #define VM_MAXUSER_ADDRESS (VM_MAX_USER_ADDRESS)
227 #define KERNBASE (VM_MIN_KERNEL_ADDRESS)
228 #define SHAREDPAGE (VM_MAXUSER_ADDRESS - PAGE_SIZE)
229 #define USRSTACK SHAREDPAGE
232 * How many physical pages per kmem arena virtual page.
234 #ifndef VM_KMEM_SIZE_SCALE
235 #define VM_KMEM_SIZE_SCALE (1)
239 * Optional ceiling (in bytes) on the size of the kmem arena: 60% of the
242 #ifndef VM_KMEM_SIZE_MAX
243 #define VM_KMEM_SIZE_MAX ((VM_MAX_KERNEL_ADDRESS - \
244 VM_MIN_KERNEL_ADDRESS + 1) * 3 / 5)
248 * Initial pagein size of beginning of executable file.
250 #ifndef VM_INITIAL_PAGEIN
251 #define VM_INITIAL_PAGEIN 16
254 #if !defined(KASAN) && !defined(KMSAN)
255 #define UMA_MD_SMALL_ALLOC
260 extern vm_paddr_t dmap_phys_base;
261 extern vm_paddr_t dmap_phys_max;
262 extern vm_offset_t dmap_max_addr;
263 extern vm_offset_t vm_max_kernel_address;
267 #define ZERO_REGION_SIZE (64 * 1024) /* 64KB */
269 #define DEVMAP_MAX_VADDR VM_MAX_KERNEL_ADDRESS
272 * The pmap can create non-transparent large page mappings.
274 #define PMAP_HAS_LARGEPAGES 1
277 * Need a page dump array for minidump.
279 #define MINIDUMP_PAGE_TRACKING 1
281 #endif /* !_MACHINE_VMPARAM_H_ */
283 #endif /* !__arm__ */