xref: /freebsd/sys/powerpc/include/slb.h (revision 6966ac055c3b7a39266fb982493330df7a097997)
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3  *
4  * Copyright (C) 2009 Nathan Whitehorn
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  *
16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19  * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26  *
27  * $FreeBSD$
28  */
29 
30 #ifndef _MACHINE_SLB_H_
31 #define	_MACHINE_SLB_H_
32 
33 /*
34  * Bit definitions for segment lookaside buffer entries.
35  *
36  * PowerPC Microprocessor Family: The Programming Environments for 64-bit
37  * Microprocessors, section 7.4.2.1
38  *
39  * Note that these bitmasks are relative to the values for one of the two
40  * values for slbmte, slbmfee, and slbmfev, not the internal SLB
41  * representation.
42  */
43 
44 #define	SLBV_KS		0x0000000000000800UL /* Supervisor-state prot key */
45 #define	SLBV_KP		0x0000000000000400UL /* User-state prot key */
46 #define	SLBV_N		0x0000000000000200UL /* No-execute protection */
47 #define	SLBV_L		0x0000000000000100UL /* Large page selector */
48 #define	SLBV_CLASS	0x0000000000000080UL /* Class selector */
49 #define	SLBV_VSID_MASK	0xfffffffffffff000UL /* Virtual segment ID mask */
50 #define	SLBV_VSID_SHIFT	12
51 
52 /*
53  * Make a predictable 1:1 map from ESIDs to VSIDs for the kernel. Hash table
54  * coverage is increased by swizzling the ESID and multiplying by a prime
55  * number (0x13bb).
56  */
57 #define	KERNEL_VSID_BIT	0x0000001000000000UL /* Bit set in all kernel VSIDs */
58 #define KERNEL_VSID(esid) ((((((uint64_t)esid << 8) | ((uint64_t)esid >> 28)) \
59 				* 0x13bbUL) & (KERNEL_VSID_BIT - 1)) | \
60 				KERNEL_VSID_BIT)
61 
62 #define	SLBE_VALID	0x0000000008000000UL /* SLB entry valid */
63 #define	SLBE_INDEX_MASK	0x0000000000000fffUL /* SLB index mask*/
64 #define	SLBE_ESID_MASK	0xfffffffff0000000UL /* Effective segment ID mask */
65 #define	SLBE_ESID_SHIFT	28
66 
67 /* Virtual real-mode VSID in LPARs */
68 #define VSID_VRMA	0x1ffffff
69 
70 /*
71  * User segment for copyin/out
72  */
73 #define USER_SLB_SLOT 0
74 #define USER_SLB_SLBE (((USER_ADDR >> ADDR_SR_SHFT) << SLBE_ESID_SHIFT) | \
75 			SLBE_VALID | USER_SLB_SLOT)
76 
77 struct slb {
78 	uint64_t	slbv;
79 	uint64_t	slbe;
80 };
81 
82 struct pmap;
83 void	handle_kernel_slb_spill(int, register_t, register_t);
84 int	handle_user_slb_spill(struct pmap *pm, vm_offset_t addr);
85 
86 #endif /* !_MACHINE_SLB_H_ */
87