2 * SPDX-License-Identifier: (BSD-3-Clause AND MIT-CMU)
4 * Copyright (c) 1991, 1993
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7 * This code is derived from software contributed to Berkeley by
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31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * from: @(#)vm_init.c 8.1 (Berkeley) 6/11/93
37 * Copyright (c) 1987, 1990 Carnegie-Mellon University.
38 * All rights reserved.
40 * Authors: Avadis Tevanian, Jr., Michael Wayne Young
42 * Permission to use, copy, modify and distribute this software and
43 * its documentation is hereby granted, provided that both the copyright
44 * notice and this permission notice appear in all copies of the
45 * software, derivative works or modified versions, and any portions
46 * thereof, and that both notices appear in supporting documentation.
48 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
49 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
50 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
52 * Carnegie Mellon requests users of this software to return to
54 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
55 * School of Computer Science
56 * Carnegie Mellon University
57 * Pittsburgh PA 15213-3890
59 * any improvements or extensions that they make and grant Carnegie the
60 * rights to redistribute these changes.
64 * Initialize the Virtual Memory subsystem.
67 #include <sys/cdefs.h>
68 #include <sys/param.h>
69 #include <sys/domainset.h>
70 #include <sys/kernel.h>
73 #include <sys/rwlock.h>
74 #include <sys/malloc.h>
75 #include <sys/sysctl.h>
76 #include <sys/systm.h>
77 #include <sys/selinfo.h>
83 #include <sys/vmmeter.h>
86 #include <vm/vm_param.h>
87 #include <vm/vm_kern.h>
88 #include <vm/vm_object.h>
89 #include <vm/vm_page.h>
90 #include <vm/vm_phys.h>
91 #include <vm/vm_pagequeue.h>
92 #include <vm/vm_map.h>
93 #include <vm/vm_pager.h>
94 #include <vm/vm_extern.h>
96 extern void uma_startup1(vm_offset_t);
101 * System initialization
103 static void vm_mem_init(void *);
104 SYSINIT(vm_mem, SI_SUB_VM, SI_ORDER_FIRST, vm_mem_init, NULL);
107 * vm_init initializes the virtual memory system.
108 * This is done only by the first cpu up.
111 vm_mem_init(void *dummy)
115 * Initialize static domainsets, used by various allocators.
120 * Initialize resident memory structures. From here on, all physical
121 * memory is accounted for, and we use only virtual addresses.
124 virtual_avail = vm_page_startup(virtual_avail);
127 * Set an initial domain policy for thread0 so that allocations
132 /* Bootstrap the kernel memory allocator. */
133 uma_startup1(virtual_avail);
136 * Initialize other VM packages
141 kmem_init(virtual_avail, virtual_end);
143 kmem_init_zero_region();
149 vm_ksubmap_init(struct kva_md_info *kmi)
151 caddr_t firstaddr, v;
159 * Allocate space for system data structures.
160 * The first available kernel virtual address is in "v".
161 * As pages of kernel virtual memory are allocated, "v" is incremented.
162 * As pages of memory are allocated and cleared,
163 * "firstaddr" is incremented.
167 * Make two passes. The first pass calculates how much memory is
168 * needed and allocates it. The second pass assigns virtual
169 * addresses to the various data structures.
176 * Discount the physical memory larger than the size of kernel_map
177 * to avoid eating up all of KVA space.
179 physmem_est = lmin(physmem, btoc(vm_map_max(kernel_map) -
180 vm_map_min(kernel_map)));
182 v = kern_vfs_bio_buffer_alloc(v, physmem_est);
185 * End of first pass, size has been calculated so allocate memory
187 if (firstaddr == NULL) {
189 #ifdef VM_FREELIST_DMA32
191 * Try to protect 32-bit DMAable memory from the largest
192 * early alloc of wired mem.
194 firstaddr = kmem_alloc_attr(size, M_ZERO | M_NOWAIT,
195 (vm_paddr_t)1 << 32, ~(vm_paddr_t)0, VM_MEMATTR_DEFAULT);
196 if (firstaddr == NULL)
198 firstaddr = kmem_malloc(size, M_ZERO | M_WAITOK);
199 if (firstaddr == NULL)
200 panic("startup: no room for tables");
205 * End of second pass, addresses have been assigned
207 if ((vm_size_t)(v - firstaddr) != size)
208 panic("startup: table size inconsistency");
211 * Allocate the clean map to hold all of I/O virtual memory.
213 size = (long)nbuf * BKVASIZE + (long)bio_transient_maxcnt * maxphys;
214 kmi->clean_sva = kva_alloc(size);
215 kmi->clean_eva = kmi->clean_sva + size;
218 * Allocate the buffer arena.
220 * Enable the quantum cache if we have more than 4 cpus. This
221 * avoids lock contention at the expense of some fragmentation.
223 size = (long)nbuf * BKVASIZE;
224 kmi->buffer_sva = kmi->clean_sva;
225 kmi->buffer_eva = kmi->buffer_sva + size;
226 vmem_init(buffer_arena, "buffer arena", kmi->buffer_sva, size,
227 PAGE_SIZE, (mp_ncpus > 4) ? BKVASIZE * 8 : 0, M_WAITOK);
230 * And optionally transient bio space.
232 if (bio_transient_maxcnt != 0) {
233 size = (long)bio_transient_maxcnt * maxphys;
234 vmem_init(transient_arena, "transient arena",
235 kmi->buffer_eva, size, PAGE_SIZE, 0, M_WAITOK);
239 * Allocate the pageable submaps. We may cache an exec map entry per
240 * CPU, so we therefore need to reserve space for at least ncpu+1
241 * entries to avoid deadlock. The exec map is also used by some image
242 * activators, so we leave a fixed number of pages for their use.
245 exec_map_entries = 8 * mp_ncpus;
247 exec_map_entries = 2 * mp_ncpus + 4;
249 exec_map_entry_size = round_page(PATH_MAX + ARG_MAX);
250 kmem_subinit(exec_map, kernel_map, &minaddr, &maxaddr,
251 exec_map_entries * exec_map_entry_size + 64 * PAGE_SIZE, false);
252 kmem_subinit(pipe_map, kernel_map, &minaddr, &maxaddr, maxpipekva,