Annotation of sys/arch/arm/include/param.h, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: param.h,v 1.11 2007/05/28 21:02:49 thib Exp $ */
2: /* $NetBSD: param.h,v 1.9 2002/03/24 03:37:23 thorpej Exp $ */
3:
4: /*
5: * Copyright (c) 1994,1995 Mark Brinicombe.
6: * All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed by the RiscBSD team.
19: * 4. The name "RiscBSD" nor the name of the author may be used to
20: * endorse or promote products derived from this software without specific
21: * prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY RISCBSD ``AS IS'' AND ANY EXPRESS OR IMPLIED
24: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25: * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26: * IN NO EVENT SHALL RISCBSD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
27: * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
28: * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
29: * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: */
35:
36: #ifndef _ARM_PARAM_H_
37: #define _ARM_PARAM_H_
38:
39: #define MACHINE_ARCH "arm"
40: #define _MACHINE_ARCH arm
41:
42: /*
43: * Machine dependent constants for ARM6+ processors
44: */
45: /* These are defined in the Port File before it includes
46: * this file. */
47:
48: #define PAGE_SHIFT 12 /* LOG2(NBPG) */
49: #define PGSHIFT 12 /* LOG2(NBPG) */
50: #define PAGE_SIZE (1 << PAGE_SHIFT) /* bytes/page */
51: #define NBPG (1 << PAGE_SHIFT) /* bytes/page */
52: #define PAGE_MASK (PAGE_SIZE - 1)
53: #define PGOFSET (PAGE_SIZE - 1)
54: #define NPTEPG (PAGE_SIZE/(sizeof (pt_entry_t)))
55:
56: #define UPAGES 2 /* pages of u-area */
57: #define USPACE (UPAGES * PAGE_SIZE) /* total size of u-area */
58: #define USPACE_ALIGN (0) /* u-area alignment 0-none */
59:
60: #ifndef MSGBUFSIZE
61: #define MSGBUFSIZE PAGE_SIZE /* default message buffer size */
62: #endif
63:
64: /*
65: * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized
66: * logical pages.
67: */
68: #define NKMEMPAGES_MIN_DEFAULT ((4 * 1024 * 1024) >> PAGE_SHIFT)
69: #define NKMEMPAGES_MAX_DEFAULT ((64 * 1024 * 1024) >> PAGE_SHIFT)
70:
71: /* Constants used to divide the USPACE area */
72:
73: /*
74: * The USPACE area contains :
75: * 1. the user structure for the process
76: * 2. the fp context for FP emulation
77: * 3. the kernel (svc) stack
78: * 4. the undefined instruction stack
79: *
80: * The layout of the area looks like this
81: *
82: * | user area | FP context | undefined stack | kernel stack |
83: *
84: * The size of the user area is known.
85: * The size of the FP context is variable depending of the FP emulator
86: * in use and whether there is hardware FP support. However we can put
87: * an upper limit on it.
88: * The undefined stack needs to be at least 512 bytes. This is a requirement
89: * if the FP emulators
90: * The kernel stack should be at least 4K is size.
91: *
92: * The stack top addresses are used to set the stack pointers. The stack bottom
93: * addresses at the addresses monitored by the diagnostic code for stack overflows
94: *
95: */
96:
97: #define FPCONTEXTSIZE (0x100)
98: #define USPACE_SVC_STACK_TOP (USPACE)
99: #define USPACE_SVC_STACK_BOTTOM (USPACE_SVC_STACK_TOP - 0x1000)
100: #define USPACE_UNDEF_STACK_TOP (USPACE_SVC_STACK_BOTTOM - 0x10)
101: #define USPACE_UNDEF_STACK_BOTTOM (sizeof(struct user) + FPCONTEXTSIZE + 10)
102:
103: #ifdef _KERNEL
104: #ifndef _LOCORE
105: void delay (unsigned);
106: #define DELAY(x) delay(x)
107: #endif
108: #endif
109:
110: /*
111: * Machine dependent constants for all ARM processors
112: */
113:
114: /*
115: * For KERNEL code:
116: * MACHINE must be defined by the individual port. This is so that
117: * uname returns the correct thing, etc.
118: *
119: * MACHINE_ARCH may be defined by individual ports as a temporary
120: * measure while we're finishing the conversion to ELF.
121: *
122: * For non-KERNEL code:
123: * If ELF, MACHINE and MACHINE_ARCH are forced to "arm/armeb".
124: */
125:
126:
127: #define MID_MACHINE MID_ARM6
128:
129: /*
130: * Round p (pointer or byte index) up to a correctly-aligned value
131: * for all data types (int, long, ...). The result is u_int and
132: * must be cast to any desired pointer type.
133: *
134: * ALIGNED_POINTER is a boolean macro that checks whether an address
135: * is valid to fetch data elements of type t from on this architecture.
136: * This does not reflect the optimal alignment, just the possibility
137: * (within reasonable limits).
138: *
139: */
140: #define ALIGNBYTES (sizeof(int) - 1)
141: #define ALIGN(p) (((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES)
142: #define ALIGNED_POINTER(p,t) ((((u_long)(p)) & (sizeof(t)-1)) == 0)
143: /* ARM-specific macro to align a stack pointer (downwards). */
144: #define STACKALIGNBYTES (8 - 1)
145: #define STACKALIGN(p) ((u_int)(p) &~ STACKALIGNBYTES)
146:
147: #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */
148: #define DEV_BSIZE (1 << DEV_BSHIFT)
149: #define BLKDEV_IOSIZE 2048
150:
151: #ifndef MAXPHYS
152: #define MAXPHYS 65536 /* max I/O transfer size */
153: #endif
154:
155: /* pages ("clicks") to disk blocks */
156: #define ctod(x) ((x) << (PAGE_SHIFT - DEV_BSHIFT))
157: #define dtoc(x) ((x) >> (PAGE_SHIFT - DEV_BSHIFT))
158: /*#define dtob(x) ((x) << DEV_BSHIFT)*/
159:
160: #define ctob(x) ((x) << PAGE_SHIFT)
161:
162: /* bytes to pages */
163: #define btoc(x) (((x) + PAGE_MASK) >> PAGE_SHIFT)
164:
165: #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \
166: ((bytes) >> DEV_BSHIFT)
167: #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \
168: ((db) << DEV_BSHIFT)
169:
170: /*
171: * Constants related to network buffer management.
172: */
173: #define NMBCLUSTERS 4096 /* map size, max cluster allocation */
174:
175: #define ovbcopy bcopy
176:
177: #ifdef _KERNEL
178: #ifdef _LOCORE
179: #include <machine/psl.h>
180: #else
181: #include <sys/param.h>
182: #include <machine/cpu.h>
183: #endif
184: #endif
185:
186: #endif /* _ARM_PARAM_H_ */
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