Annotation of sys/arch/m68k/include/vmparam.h, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: vmparam.h,v 1.5 2005/12/08 23:50:54 miod Exp $ */
2:
3: /*
4: * Copyright (c) 1988 University of Utah.
5: * Copyright (c) 1982, 1990 The Regents of the University of California.
6: * All rights reserved.
7: *
8: * This code is derived from software contributed to Berkeley by
9: * the Systems Programming Group of the University of Utah Computer
10: * Science Department.
11: *
12: * Redistribution and use in source and binary forms, with or without
13: * modification, are permitted provided that the following conditions
14: * are met:
15: * 1. Redistributions of source code must retain the above copyright
16: * notice, this list of conditions and the following disclaimer.
17: * 2. Redistributions in binary form must reproduce the above copyright
18: * notice, this list of conditions and the following disclaimer in the
19: * documentation and/or other materials provided with the distribution.
20: * 3. Neither the name of the University nor the names of its contributors
21: * may be used to endorse or promote products derived from this software
22: * without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34: * SUCH DAMAGE.
35: */
36:
37: /*
38: * Machine dependent constants for m68k-based platforms.
39: */
40: #ifndef _M68K_VMPARAM_H_
41: #define _M68K_VMPARAM_H_
42:
43: /*
44: * USRTEXT is the start of the user text/data space, while USRSTACK
45: * is the top (end) of the user stack. LOWPAGES and HIGHPAGES are
46: * the number of pages from the beginning of the P0 region to the
47: * beginning of the text and from the beginning of the P1 region to the
48: * beginning of the stack respectively.
49: *
50: * NOTE: the ONLY reason that HIGHPAGES is 0x100 instead of UPAGES (3)
51: * is for HPUX compatibility. Why?? Because HPUX's debuggers
52: * have the user's stack hard-wired at FFF00000 for post-mortems,
53: * and we must be compatible...
54: */
55: #define USRTEXT 8192
56: #define USRSTACK (-HIGHPAGES*NBPG) /* Start of user stack */
57: #define LOWPAGES 0
58: #define HIGHPAGES (0x100000/NBPG)
59:
60: /*
61: * Virtual memory related constants, all in bytes
62: */
63: #ifndef MAXTSIZ
64: #define MAXTSIZ (8*1024*1024) /* max text size */
65: #endif
66: #ifndef DFLDSIZ
67: #define DFLDSIZ (32*1024*1024) /* initial data size limit */
68: #endif
69: #ifndef MAXDSIZ
70: #define MAXDSIZ (64*1024*1024) /* max data size */
71: #endif
72: #ifndef DFLSSIZ
73: #define DFLSSIZ (2*1024*1024) /* initial stack size limit */
74: #endif
75: #ifndef MAXSSIZ
76: #define MAXSSIZ MAXDSIZ /* max stack size */
77: #endif
78:
79: #define STACKGAP_RANDOM 256*1024
80:
81: /*
82: * Sizes of the system and user portions of the system page table.
83: */
84: #define USRPTSIZE (1 * NPTEPG) /* 4mb */
85:
86: /*
87: * PTEs for mapping user space into the kernel for phyio operations.
88: * One page is enough to handle 4Mb of simultaneous raw IO operations.
89: */
90: #ifndef USRIOSIZE
91: #define USRIOSIZE (1 * NPTEPG) /* 4mb */
92: #endif
93:
94: /*
95: * PTEs for system V style shared memory.
96: * This is basically slop for kmempt which we actually allocate (malloc) from.
97: */
98: #ifndef SHMMAXPGS
99: #define SHMMAXPGS 1024 /* 4mb */
100: #endif
101:
102: /* user/kernel map constants */
103: #define VM_MIN_ADDRESS ((vaddr_t)0)
104: #define VM_MAXUSER_ADDRESS ((vaddr_t)(USRSTACK))
105: #define VM_MAX_ADDRESS ((vaddr_t)(0-(UPAGES*NBPG)))
106: #define VM_MIN_KERNEL_ADDRESS ((vaddr_t)0)
107: #define VM_MAX_KERNEL_ADDRESS ((vaddr_t)(0-NBPG))
108:
109: /* virtual sizes (bytes) for various kernel submaps */
110: #define VM_PHYS_SIZE (USRIOSIZE*PAGE_SIZE)
111:
112: /* # of kernel PT pages (initial only, can grow dynamically) */
113: #define VM_KERNEL_PT_PAGES ((vsize_t)2)
114:
115: /*
116: * Constants which control the way the VM system deals with memory segments.
117: */
118: #define VM_PHYSSEG_NOADD
119:
120: #define VM_NFREELIST 1
121: #define VM_FREELIST_DEFAULT 0
122:
123: #ifndef _LOCORE
124:
125: #include <machine/pte.h> /* st_entry_t */
126:
127: /* XXX - belongs in pmap.h, but put here because of ordering issues */
128: struct pv_entry {
129: struct pv_entry *pv_next; /* next pv_entry */
130: struct pmap *pv_pmap; /* pmap where mapping lies */
131: vaddr_t pv_va; /* virtual address for mapping */
132: st_entry_t *pv_ptste; /* non-zero if VA maps a PT page */
133: struct pmap *pv_ptpmap; /* if pv_ptste, pmap for PT page */
134: int pv_flags; /* flags */
135: };
136:
137: /*
138: * pv_flags carries some PTE permission bits as well - make sure extra flags
139: * values are > (1 << PG_SHIFT)
140: */
141: /* header: all entries are cache inhibited */
142: #define PV_CI (0x01 << PG_SHIFT)
143: /* header: entry maps a page table page */
144: #define PV_PTPAGE (0x02 << PG_SHIFT)
145:
146: #define __HAVE_VM_PAGE_MD
147: struct vm_page_md {
148: struct pv_entry pvent;
149: };
150:
151: #define VM_MDPAGE_INIT(pg) do { \
152: (pg)->mdpage.pvent.pv_next = NULL; \
153: (pg)->mdpage.pvent.pv_pmap = NULL; \
154: (pg)->mdpage.pvent.pv_va = 0; \
155: (pg)->mdpage.pvent.pv_ptste = NULL; \
156: (pg)->mdpage.pvent.pv_ptpmap = NULL; \
157: (pg)->mdpage.pvent.pv_flags = 0; \
158: } while (0)
159:
160: #endif /* _LOCORE */
161:
162: #endif /* !_M68K_VMPARAM_H_ */
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