xref: /netbsd-src/sys/arch/sun3/include/pmap3x.h (revision 03daa790ebb1227f96803546c28ec9033628154d)
1 /*	$NetBSD: pmap3x.h,v 1.32 2024/12/20 23:50:00 tsutsui Exp $	*/
2 
3 /*-
4  * Copyright (c) 1997 The NetBSD Foundation, Inc.
5  * All rights reserved.
6  *
7  * This code is derived from software contributed to The NetBSD Foundation
8  * by Jeremy Cooper.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29  * POSSIBILITY OF SUCH DAMAGE.
30  */
31 
32 #ifdef _KERNEL
33 /*
34  * Physical map structures exported to the VM code.
35  */
36 
37 struct pmap {
38 	struct a_tmgr_struct	*pm_a_tmgr; 	/* Level-A table manager */
39 	paddr_t              	pm_a_phys;  	/* MMU level-A phys addr */
40 	u_int             	pm_refcount;	/* reference count */
41 	int             	pm_version;
42 };
43 
44 /* Common function for pmap_resident_count(), pmap_wired_count() */
45 segsz_t pmap_count(pmap_t, int);
46 
47 /* This needs to be a macro for kern_sysctl.c */
48 #define	pmap_resident_count(pmap)	(pmap_count((pmap), 0))
49 
50 /* This needs to be a macro for vm_mmap.c */
51 #define	pmap_wired_count(pmap)  	(pmap_count((pmap), 1))
52 
53 /* We use the PA plus some low bits for device mmap. */
54 #define pmap_phys_address(addr) 	(addr)
55 
56 /* Map a given physical region to a virtual region */
57 vaddr_t pmap_map(vaddr_t, paddr_t, paddr_t, int);
58 
59 static __inline bool
60 pmap_remove_all(struct pmap *pmap)
61 {
62 	/* Nothing. */
63 	return false;
64 }
65 
66 /*
67  * Flags to tell pmap_enter `this is not to be cached', etc.
68  * Since physical addresses are always aligned, we can use
69  * the low order bits for this.
70  */
71 #define	PMAP_OBMEM	0x00	/* unused */
72 #define	PMAP_OBIO	0x00	/* unused */
73 #define	PMAP_VME16	0x10	/* pmap will add the necessary offset */
74 #define	PMAP_VME32	0x20	/* etc. */
75 #define	PMAP_NC		0x40	/* tells pmap_enter to set PTE_CI */
76 #define	PMAP_SPEC	0xFF	/* mask to get all above. */
77 
78 #endif	/* _KERNEL */
79 
80 /* MMU specific segment size */
81 #define	SEGSHIFT	19	        /* LOG2(NBSG) */
82 #define	NBSG		(1 << SEGSHIFT)	/* bytes/segment */
83 #define	SEGOFSET	(NBSG - 1)	/* byte offset into segment */
84 
85 #define	sun3x_round_seg(x)	((((vaddr_t)(x)) + SEGOFSET) & ~SEGOFSET)
86 #define	sun3x_trunc_seg(x)	((vaddr_t)(x) & ~SEGOFSET)
87 #define	sun3x_seg_offset(x)	((vaddr_t)(x) & SEGOFSET)
88