2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1990 The Regents of the University of California.
7 * This code is derived from software contributed to Berkeley by
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34 * from: @(#)param.h 5.8 (Berkeley) 6/28/91
38 #ifndef _I386_INCLUDE_PARAM_H_
39 #define _I386_INCLUDE_PARAM_H_
41 #include <machine/_align.h>
44 * Machine dependent constants for Intel 386.
49 #define __PCI_REROUTE_INTERRUPT
52 #define MACHINE "i386"
55 #define MACHINE_ARCH "i386"
57 #define MID_MACHINE MID_I386
71 #define ALIGNBYTES _ALIGNBYTES
72 #define ALIGN(p) _ALIGN(p)
74 * ALIGNED_POINTER is a boolean macro that checks whether an address
75 * is valid to fetch data elements of type t from on this architecture.
76 * This does not reflect the optimal alignment, just the possibility
77 * (within reasonable limits).
79 #define ALIGNED_POINTER(p, t) 1
82 * CACHE_LINE_SIZE is the compile-time maximum cache line size for an
83 * architecture. It should be used with appropriate caution.
85 #define CACHE_LINE_SHIFT 6
86 #define CACHE_LINE_SIZE (1 << CACHE_LINE_SHIFT)
88 #define PAGE_SHIFT 12 /* LOG2(PAGE_SIZE) */
89 #define PAGE_SIZE (1 << PAGE_SHIFT) /* bytes/page */
90 #define PAGE_MASK (PAGE_SIZE - 1)
91 #define NPTEPG (PAGE_SIZE / sizeof(pt_entry_t))
93 /* Size in bytes of the page directory */
94 #define NBPTD (NPGPTD << PAGE_SHIFT)
95 /* Number of PDEs in page directory, 2048 for PAE, 1024 for non-PAE */
96 #define NPDEPTD (NBPTD / sizeof(pd_entry_t))
97 /* Number of PDEs in one page of the page directory, 512 vs. 1024 */
98 #define NPDEPG (PAGE_SIZE / sizeof(pd_entry_t))
99 #define PDRMASK (NBPDR - 1)
101 #define PDRSHIFT i386_pmap_PDRSHIFT
104 #define NBPDR (1 << PDRSHIFT) /* bytes/page dir */
107 #define MAXPAGESIZES 2 /* maximum number of supported page sizes */
109 #define IOPAGES 2 /* pages of i/o permission bitmap */
112 #define KSTACK_PAGES 4 /* Includes pcb! */
114 #define KSTACK_GUARD_PAGES 1 /* pages of kstack guard; 0 disables */
116 #define TD0_KSTACK_PAGES 4
118 #define TD0_KSTACK_PAGES KSTACK_PAGES
122 * Ceiling on amount of swblock kva space, can be changed via
123 * the kern.maxswzone /boot/loader.conf variable.
125 * 276 is sizeof(struct swblock), but we do not always have a definition
126 * in scope for struct swblock, so we have to hardcode it. Each struct
127 * swblock holds metadata for 32 pages, so in theory, this is enough for
128 * 16 GB of swap. In practice, however, the usable amount is considerably
129 * lower due to fragmentation.
131 #ifndef VM_SWZONE_SIZE_MAX
132 #define VM_SWZONE_SIZE_MAX (276 * 128 * 1024)
136 * Ceiling on size of buffer cache (really only effects write queueing,
137 * the VM page cache is not effected), can be changed via
138 * the kern.maxbcache /boot/loader.conf variable.
140 * The value is equal to the size of the auto-tuned buffer map for
141 * the machine with 4GB of RAM, see vfs_bio.c:kern_vfs_bio_buffer_alloc().
143 #ifndef VM_BCACHE_SIZE_MAX
144 #define VM_BCACHE_SIZE_MAX (7224 * 16 * 1024)
148 * Mach derived conversion macros
150 #define trunc_page(x) ((x) & ~PAGE_MASK)
151 #define round_page(x) (((x) + PAGE_MASK) & ~PAGE_MASK)
152 #define trunc_4mpage(x) ((x) & ~PDRMASK)
153 #define round_4mpage(x) ((((x)) + PDRMASK) & ~PDRMASK)
155 #define atop(x) ((x) >> PAGE_SHIFT)
156 #define ptoa(x) ((x) << PAGE_SHIFT)
158 #define i386_btop(x) ((x) >> PAGE_SHIFT)
159 #define i386_ptob(x) ((x) << PAGE_SHIFT)
161 #define pgtok(x) ((x) * (PAGE_SIZE / 1024))
163 #define INKERNEL(va) (TRUE)
165 #endif /* !_I386_INCLUDE_PARAM_H_ */