1/*      $NetBSD: param.h,v 1.13 2010/05/06 19:10:26 joerg Exp $ */
2
3/*
4 * Copyright (c) 1994,1995 Mark Brinicombe.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *      This product includes software developed by the RiscBSD team.
18 * 4. The name "RiscBSD" nor the name of the author may be used to
19 *    endorse or promote products derived from this software without specific
20 *    prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY RISCBSD ``AS IS'' AND ANY EXPRESS OR IMPLIED
23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL RISCBSD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
26 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
27 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
28 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#ifndef _AARCH64_PARAM_H_
36#define _AARCH64_PARAM_H_
37
38// TODO: These were based on the ARMv7 version. Verify that it is correct.
39
40/*
41 * Machine dependent constants for all ARM processors
42 */
43
44/*
45 * For KERNEL code:
46 *      MACHINE must be defined by the individual port.  This is so that
47 *      uname returns the correct thing, etc.
48 *
49 *      MACHINE_ARCH may be defined by individual ports as a temporary
50 *      measure while we're finishing the conversion to ELF.
51 *
52 * For non-KERNEL code:
53 *      If ELF, MACHINE and MACHINE_ARCH are forced to "arm/armeb".
54 */
55
56#if defined(_KERNEL)
57#undef _MACHINE
58#undef MACHINE
59#undef _MACHINE_ARCH
60#undef MACHINE_ARCH
61#define _MACHINE        aarch64
62#define MACHINE         "aarch64"
63#define _MACHINE_ARCH   aarch64
64#define MACHINE_ARCH    "aarch64"
65#endif /* !_KERNEL */
66
67#define MID_MACHINE     MID_AARCH64
68
69/*
70 * Round p (pointer or byte index) up to a correctly-aligned value
71 * for all data types (int, long, ...).   The result is u_int and
72 * must be cast to any desired pointer type.
73 *
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).
78 *
79 */
80#define ALIGNBYTES              (sizeof(int) - 1)
81#define ALIGN(p)                (((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES)
82#define ALIGNED_POINTER(p,t)    ((((u_long)(p)) & (sizeof(t)-1)) == 0)
83/* ARM-specific macro to align a stack pointer (downwards). */
84#define STACKALIGNBYTES         (8 - 1)
85#define STACKALIGN(p)           ((u_int)(p) &~ STACKALIGNBYTES)
86
87#define DEV_BSHIFT      9               /* log2(DEV_BSIZE) */
88#define DEV_BSIZE       (1 << DEV_BSHIFT)
89#define BLKDEV_IOSIZE   2048
90
91#ifndef MAXPHYS
92#define MAXPHYS         65536           /* max I/O transfer size */
93#endif
94
95/*
96 * Constants related to network buffer management.
97 * MCLBYTES must be no larger than NBPG (the software page size), and,
98 * on machines that exchange pages of input or output buffers with mbuf
99 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
100 * of the hardware page size.
101 */
102#define MSIZE           256             /* size of an mbuf */
103
104#ifndef MCLSHIFT
105#define MCLSHIFT        11              /* convert bytes to m_buf clusters */
106                                        /* 2K cluster can hold Ether frame */
107#endif  /* MCLSHIFT */
108
109#define MCLBYTES        (1 << MCLSHIFT) /* size of a m_buf cluster */
110
111#ifndef NMBCLUSTERS_MAX
112#define NMBCLUSTERS_MAX (0x2000000 / MCLBYTES)  /* Limit to 64MB for clusters */
113#endif
114
115/*
116 * Compatibility /dev/zero mapping.
117 */
118#ifdef _KERNEL
119#ifdef COMPAT_16
120#define COMPAT_ZERODEV(x)       (x == makedev(0, _DEV_ZERO_oARM))
121#endif
122#endif /* _KERNEL */
123
124#endif /* _AARCH64_PARAM_H_ */
125