1/* $OpenBSD: param.h,v 1.25 2023/12/14 13:26:49 claudio 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 _ARM_PARAM_H_
36#define _ARM_PARAM_H_
37
38#define MACHINE_ARCH "arm"
39#define _MACHINE_ARCH arm
40#define MID_MACHINE MID_ARM6
41
42#define PAGE_SHIFT 12
43#define PAGE_SIZE (1 << PAGE_SHIFT)
44#define PAGE_MASK (PAGE_SIZE - 1)
45
46#ifdef _KERNEL
47
48#define NPTEPG (PAGE_SIZE/(sizeof (pt_entry_t)))
49
50#define NBPG PAGE_SIZE
51#define PGSHIFT PAGE_SHIFT
52#define PGOFSET PAGE_MASK
53
54#define UPAGES 2 /* pages of u-area */
55#define USPACE (UPAGES * PAGE_SIZE) /* total size of u-area */
56#define USPACE_ALIGN 0 /* u-area alignment 0-none */
57
58#define NMBCLUSTERS (32 * 1024) /* max cluster allocation */
59
60/* Constants used to divide the USPACE area */
61/*
62 * The USPACE area contains :
63 * 1. the user structure for the process
64 * 2. the fp context for FP emulation
65 * 3. the kernel (svc) stack
66 * 4. the undefined instruction stack
67 *
68 * The layout of the area looks like this
69 *
70 * | user area | FP context | undefined stack | kernel stack |
71 *
72 * The size of the user area is known.
73 * The size of the FP context is variable depending of the FP emulator
74 * in use and whether there is hardware FP support. However we can put
75 * an upper limit on it.
76 * The undefined stack needs to be at least 512 bytes. This is a requirement
77 * of the FP emulators
78 * The kernel stack should be at least 4K in size.
79 *
80 * The stack top addresses are used to set the stack pointers. The stack bottom
81 * addresses are the addresses monitored by the diagnostic code for stack
82 * overflows.
83 */
84
85#define FPCONTEXTSIZE (0x100)
86#define USPACE_SVC_STACK_TOP (USPACE)
87#define USPACE_SVC_STACK_BOTTOM (USPACE_SVC_STACK_TOP - 0x1000)
88#define USPACE_UNDEF_STACK_TOP (USPACE_SVC_STACK_BOTTOM - 0x10)
89#define USPACE_UNDEF_STACK_BOTTOM (sizeof(struct user) + FPCONTEXTSIZE + 10)
90
91#ifndef _LOCORE
92void delay (unsigned);
93#define DELAY(x) delay(x)
94#endif
95
96#if !defined(_LOCORE)
97#include <machine/cpu.h>
98#endif
99
100/* ARM-specific macro to align a stack pointer (downwards). */
101#define STACKALIGNBYTES (8 - 1)
102#define STACKALIGN(p) ((u_long)(p) &~ STACKALIGNBYTES)
103
104#endif /* _KERNEL */
105
106#endif /* _ARM_PARAM_H_ */