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
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11 * modification, are permitted provided that the following conditions
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33 * from: FreeBSD: src/sys/i386/include/vmparam.h,v 1.33 2000/03/30
37 #include <arm/vmparam.h>
40 #ifndef _MACHINE_VMPARAM_H_
41 #define _MACHINE_VMPARAM_H_
44 * Virtual memory related constants, all in bytes
47 #define MAXTSIZ (1*1024*1024*1024) /* max text size */
50 #define DFLDSIZ (128*1024*1024) /* initial data size limit */
53 #define MAXDSIZ (1*1024*1024*1024) /* max data size */
56 #define DFLSSIZ (128*1024*1024) /* initial stack size limit */
59 #define MAXSSIZ (1*1024*1024*1024) /* max stack size */
62 #define SGROWSIZ (128*1024) /* amount to grow stack */
66 * The physical address space is sparsely populated.
68 #define VM_PHYSSEG_SPARSE
71 * The number of PHYSSEG entries.
73 #define VM_PHYSSEG_MAX 64
76 * Create two free page pools: VM_FREEPOOL_DEFAULT is the default pool
77 * from which physical pages are allocated and VM_FREEPOOL_DIRECT is
78 * the pool from which physical pages for small UMA objects are
81 #define VM_NFREEPOOL 2
82 #define VM_FREEPOOL_DEFAULT 0
83 #define VM_FREEPOOL_DIRECT 1
86 * Create one free page lists: VM_FREELIST_DEFAULT is for all physical
89 #define VM_NFREELIST 1
90 #define VM_FREELIST_DEFAULT 0
93 * When PAGE_SIZE is 4KB, an allocation size of 16MB is supported in order
94 * to optimize the use of the direct map by UMA. Specifically, a 64-byte
95 * cache line contains at most 8 L2 BLOCK entries, collectively mapping 16MB
96 * of physical memory. By reducing the number of distinct 16MB "pages" that
97 * are used by UMA, the physical memory allocator reduces the likelihood of
98 * both 2MB page TLB misses and cache misses during the page table walk when
99 * a 2MB page TLB miss does occur.
101 #define VM_NFREEORDER 13
104 * Enable superpage reservations: 1 level.
106 #ifndef VM_NRESERVLEVEL
107 #define VM_NRESERVLEVEL 1
111 * Level 0 reservations consist of 512 pages.
113 #ifndef VM_LEVEL_0_ORDER
114 #define VM_LEVEL_0_ORDER 9
118 * Address space layout.
120 * ARMv8 implements up to a 48 bit virtual address space. The address space is
121 * split into 2 regions at each end of the 64 bit address space, with an
122 * out of range "hole" in the middle.
124 * We use the full 48 bits for each region, however the kernel may only use
125 * a limited range within this space.
127 * Upper region: 0xffffffffffffffff Top of virtual memory
129 * 0xfffffeffffffffff End of DMAP
130 * 0xffffa00000000000 Start of DMAP
132 * 0xffff009fffffffff End of KASAN shadow map
133 * 0xffff008000000000 Start of KASAN shadow map
135 * 0xffff007fffffffff End of KVA
136 * 0xffff000000000000 Kernel base address & start of KVA
138 * Hole: 0xfffeffffffffffff
141 * Lower region: 0x0000ffffffffffff End of user address space
142 * 0x0000000000000000 Start of user address space
144 * We use the upper region for the kernel, and the lower region for userland.
146 * We define some interesting address constants:
148 * VM_MIN_ADDRESS and VM_MAX_ADDRESS define the start and end of the entire
149 * 64 bit address space, mostly just for convenience.
151 * VM_MIN_KERNEL_ADDRESS and VM_MAX_KERNEL_ADDRESS define the start and end of
152 * mappable kernel virtual address space.
154 * VM_MIN_USER_ADDRESS and VM_MAX_USER_ADDRESS define the start and end of the
155 * user address space.
157 #define VM_MIN_ADDRESS (0x0000000000000000UL)
158 #define VM_MAX_ADDRESS (0xffffffffffffffffUL)
160 /* 512 GiB of kernel addresses */
161 #define VM_MIN_KERNEL_ADDRESS (0xffff000000000000UL)
162 #define VM_MAX_KERNEL_ADDRESS (0xffff008000000000UL)
164 /* 128 GiB KASAN shadow map */
165 #define KASAN_MIN_ADDRESS (0xffff008000000000UL)
166 #define KASAN_MAX_ADDRESS (0xffff00a000000000UL)
168 /* The address bits that hold a pointer authentication code */
169 #define PAC_ADDR_MASK (0xff7f000000000000UL)
171 /* If true addr is in the kernel address space */
172 #define ADDR_IS_KERNEL(addr) (((addr) & (1ul << 55)) == (1ul << 55))
173 /* If true addr is in its canonical form (i.e. no TBI, PAC, etc.) */
174 #define ADDR_IS_CANONICAL(addr) \
175 (((addr) & 0xffff000000000000UL) == 0 || \
176 ((addr) & 0xffff000000000000UL) == 0xffff000000000000UL)
177 #define ADDR_MAKE_CANONICAL(addr) ({ \
178 __typeof(addr) _tmp_addr = (addr); \
180 _tmp_addr &= ~0xffff000000000000UL; \
181 if (ADDR_IS_KERNEL(addr)) \
182 _tmp_addr |= 0xffff000000000000UL; \
187 /* 95 TiB maximum for the direct map region */
188 #define DMAP_MIN_ADDRESS (0xffffa00000000000UL)
189 #define DMAP_MAX_ADDRESS (0xffffff0000000000UL)
191 #define DMAP_MIN_PHYSADDR (dmap_phys_base)
192 #define DMAP_MAX_PHYSADDR (dmap_phys_max)
194 /* True if pa is in the dmap range */
195 #define PHYS_IN_DMAP(pa) ((pa) >= DMAP_MIN_PHYSADDR && \
196 (pa) < DMAP_MAX_PHYSADDR)
197 /* True if va is in the dmap range */
198 #define VIRT_IN_DMAP(va) ((va) >= DMAP_MIN_ADDRESS && \
199 (va) < (dmap_max_addr))
201 #define PMAP_HAS_DMAP 1
202 #define PHYS_TO_DMAP(pa) \
204 KASSERT(PHYS_IN_DMAP(pa), \
205 ("%s: PA out of range, PA: 0x%lx", __func__, \
206 (vm_paddr_t)(pa))); \
207 ((pa) - dmap_phys_base) + DMAP_MIN_ADDRESS; \
210 #define DMAP_TO_PHYS(va) \
212 KASSERT(VIRT_IN_DMAP(va), \
213 ("%s: VA out of range, VA: 0x%lx", __func__, \
214 (vm_offset_t)(va))); \
215 ((va) - DMAP_MIN_ADDRESS) + dmap_phys_base; \
218 #define VM_MIN_USER_ADDRESS (0x0000000000000000UL)
219 #define VM_MAX_USER_ADDRESS (0x0001000000000000UL)
221 #define VM_MINUSER_ADDRESS (VM_MIN_USER_ADDRESS)
222 #define VM_MAXUSER_ADDRESS (VM_MAX_USER_ADDRESS)
224 #define KERNBASE (VM_MIN_KERNEL_ADDRESS)
225 #define SHAREDPAGE (VM_MAXUSER_ADDRESS - PAGE_SIZE)
226 #define USRSTACK SHAREDPAGE
229 * How many physical pages per kmem arena virtual page.
231 #ifndef VM_KMEM_SIZE_SCALE
232 #define VM_KMEM_SIZE_SCALE (1)
236 * Optional ceiling (in bytes) on the size of the kmem arena: 60% of the
239 #ifndef VM_KMEM_SIZE_MAX
240 #define VM_KMEM_SIZE_MAX ((VM_MAX_KERNEL_ADDRESS - \
241 VM_MIN_KERNEL_ADDRESS + 1) * 3 / 5)
245 * Initial pagein size of beginning of executable file.
247 #ifndef VM_INITIAL_PAGEIN
248 #define VM_INITIAL_PAGEIN 16
251 #if !defined(KASAN) && !defined(KMSAN)
252 #define UMA_MD_SMALL_ALLOC
257 extern vm_paddr_t dmap_phys_base;
258 extern vm_paddr_t dmap_phys_max;
259 extern vm_offset_t dmap_max_addr;
260 extern vm_offset_t vm_max_kernel_address;
264 #define ZERO_REGION_SIZE (64 * 1024) /* 64KB */
266 #define DEVMAP_MAX_VADDR VM_MAX_KERNEL_ADDRESS
269 * The pmap can create non-transparent large page mappings.
271 #define PMAP_HAS_LARGEPAGES 1
274 * Need a page dump array for minidump.
276 #define MINIDUMP_PAGE_TRACKING 1
278 #endif /* !_MACHINE_VMPARAM_H_ */
280 #endif /* !__arm__ */