Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * include/asm-xtensa/fixmap.h
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
7 *
8 * Copyright (C) 2001 - 2005 Tensilica Inc.
9 */
10
11#ifndef _XTENSA_FIXMAP_H
12#define _XTENSA_FIXMAP_H
13
14#include <asm/processor.h>
15
16#ifdef CONFIG_MMU
17
18/*
19 * Here we define all the compile-time virtual addresses.
20 */
21
22#if XCHAL_SEG_MAPPABLE_VADDR != 0
23# error "Current port requires virtual user space starting at 0"
24#endif
25#if XCHAL_SEG_MAPPABLE_SIZE < 0x80000000
26# error "Current port requires at least 0x8000000 bytes for user space"
27#endif
28
29/* Verify instruction/data ram/rom and xlmi don't overlay vmalloc space. */
30
31#define __IN_VMALLOC(addr) \
32 (((addr) >= VMALLOC_START) && ((addr) < VMALLOC_END))
33#define __SPAN_VMALLOC(start,end) \
34 (((start) < VMALLOC_START) && ((end) >= VMALLOC_END))
35#define INSIDE_VMALLOC(start,end) \
36 (__IN_VMALLOC((start)) || __IN_VMALLOC(end) || __SPAN_VMALLOC((start),(end)))
37
38#if XCHAL_NUM_INSTROM
39# if XCHAL_NUM_INSTROM == 1
40# if INSIDE_VMALLOC(XCHAL_INSTROM0_VADDR,XCHAL_INSTROM0_VADDR+XCHAL_INSTROM0_SIZE)
41# error vmalloc range conflicts with instrom0
42# endif
43# endif
44# if XCHAL_NUM_INSTROM == 2
45# if INSIDE_VMALLOC(XCHAL_INSTROM1_VADDR,XCHAL_INSTROM1_VADDR+XCHAL_INSTROM1_SIZE)
46# error vmalloc range conflicts with instrom1
47# endif
48# endif
49#endif
50
51#if XCHAL_NUM_INSTRAM
52# if XCHAL_NUM_INSTRAM == 1
53# if INSIDE_VMALLOC(XCHAL_INSTRAM0_VADDR,XCHAL_INSTRAM0_VADDR+XCHAL_INSTRAM0_SIZE)
54# error vmalloc range conflicts with instram0
55# endif
56# endif
57# if XCHAL_NUM_INSTRAM == 2
58# if INSIDE_VMALLOC(XCHAL_INSTRAM1_VADDR,XCHAL_INSTRAM1_VADDR+XCHAL_INSTRAM1_SIZE)
59# error vmalloc range conflicts with instram1
60# endif
61# endif
62#endif
63
64#if XCHAL_NUM_DATAROM
65# if XCHAL_NUM_DATAROM == 1
66# if INSIDE_VMALLOC(XCHAL_DATAROM0_VADDR,XCHAL_DATAROM0_VADDR+XCHAL_DATAROM0_SIZE)
67# error vmalloc range conflicts with datarom0
68# endif
69# endif
70# if XCHAL_NUM_DATAROM == 2
71# if INSIDE_VMALLOC(XCHAL_DATAROM1_VADDR,XCHAL_DATAROM1_VADDR+XCHAL_DATAROM1_SIZE)
72# error vmalloc range conflicts with datarom1
73# endif
74# endif
75#endif
76
77#if XCHAL_NUM_DATARAM
78# if XCHAL_NUM_DATARAM == 1
79# if INSIDE_VMALLOC(XCHAL_DATARAM0_VADDR,XCHAL_DATARAM0_VADDR+XCHAL_DATARAM0_SIZE)
80# error vmalloc range conflicts with dataram0
81# endif
82# endif
83# if XCHAL_NUM_DATARAM == 2
84# if INSIDE_VMALLOC(XCHAL_DATARAM1_VADDR,XCHAL_DATARAM1_VADDR+XCHAL_DATARAM1_SIZE)
85# error vmalloc range conflicts with dataram1
86# endif
87# endif
88#endif
89
90#if XCHAL_NUM_XLMI
91# if XCHAL_NUM_XLMI == 1
92# if INSIDE_VMALLOC(XCHAL_XLMI0_VADDR,XCHAL_XLMI0_VADDR+XCHAL_XLMI0_SIZE)
93# error vmalloc range conflicts with xlmi0
94# endif
95# endif
96# if XCHAL_NUM_XLMI == 2
97# if INSIDE_VMALLOC(XCHAL_XLMI1_VADDR,XCHAL_XLMI1_VADDR+XCHAL_XLMI1_SIZE)
98# error vmalloc range conflicts with xlmi1
99# endif
100# endif
101#endif
102
103#if (XCHAL_NUM_INSTROM > 2) || \
104 (XCHAL_NUM_INSTRAM > 2) || \
105 (XCHAL_NUM_DATARAM > 2) || \
106 (XCHAL_NUM_DATAROM > 2) || \
107 (XCHAL_NUM_XLMI > 2)
108# error Insufficient checks on vmalloc above for more than 2 devices
109#endif
110
111/*
112 * USER_VM_SIZE does not necessarily equal TASK_SIZE. We bumped
113 * TASK_SIZE down to 0x4000000 to simplify the handling of windowed
114 * call instructions (currently limited to a range of 1 GByte). User
115 * tasks may very well reclaim the VM space from 0x40000000 to
116 * 0x7fffffff in the future, so we do not want the kernel becoming
117 * accustomed to having any of its stuff (e.g., page tables) in this
118 * region. This VM region is no-man's land for now.
119 */
120
121#define USER_VM_START XCHAL_SEG_MAPPABLE_VADDR
122#define USER_VM_SIZE 0x80000000
123
124/* Size of page table: */
125
126#define PGTABLE_SIZE_BITS (32 - XCHAL_MMU_MIN_PTE_PAGE_SIZE + 2)
127#define PGTABLE_SIZE (1L << PGTABLE_SIZE_BITS)
128
129/* All kernel-mappable space: */
130
131#define KERNEL_ALLMAP_START (USER_VM_START + USER_VM_SIZE)
132#define KERNEL_ALLMAP_SIZE (XCHAL_SEG_MAPPABLE_SIZE - KERNEL_ALLMAP_START)
133
134/* Carve out page table at start of kernel-mappable area: */
135
136#if KERNEL_ALLMAP_SIZE < PGTABLE_SIZE
137#error "Gimme some space for page table!"
138#endif
139#define PGTABLE_START KERNEL_ALLMAP_START
140
141/* Remaining kernel-mappable space: */
142
143#define KERNEL_MAPPED_START (KERNEL_ALLMAP_START + PGTABLE_SIZE)
144#define KERNEL_MAPPED_SIZE (KERNEL_ALLMAP_SIZE - PGTABLE_SIZE)
145
146#if KERNEL_MAPPED_SIZE < 0x01000000 /* 16 MB is arbitrary for now */
147# error "Shouldn't the kernel have at least *some* mappable space?"
148#endif
149
150#define MAX_LOW_MEMORY XCHAL_KSEG_CACHED_SIZE
151
152#endif
153
154/*
155 * Some constants used elsewhere, but perhaps only in Xtensa header
156 * files, so maybe we can get rid of some and access compile-time HAL
157 * directly...
158 *
159 * Note: We assume that system RAM is located at the very start of the
160 * kernel segments !!
161 */
162#define KERNEL_VM_LOW XCHAL_KSEG_CACHED_VADDR
163#define KERNEL_VM_HIGH XCHAL_KSEG_BYPASS_VADDR
164#define KERNEL_SPACE XCHAL_KSEG_CACHED_VADDR
165
166/*
167 * Returns the physical/virtual addresses of the kernel space
168 * (works with the cached kernel segment only, which is the
169 * one normally used for kernel operation).
170 */
171
172/* PHYSICAL BYPASS CACHED
173 *
174 * bypass vaddr bypass paddr * cached vaddr
175 * cached vaddr cached paddr bypass vaddr *
176 * bypass paddr * bypass vaddr cached vaddr
177 * cached paddr * bypass vaddr cached vaddr
178 * other * * *
179 */
180
181#define PHYSADDR(a) \
182(((unsigned)(a) >= XCHAL_KSEG_BYPASS_VADDR \
183 && (unsigned)(a) < XCHAL_KSEG_BYPASS_VADDR + XCHAL_KSEG_BYPASS_SIZE) ? \
184 (unsigned)(a) - XCHAL_KSEG_BYPASS_VADDR + XCHAL_KSEG_BYPASS_PADDR : \
185 ((unsigned)(a) >= XCHAL_KSEG_CACHED_VADDR \
186 && (unsigned)(a) < XCHAL_KSEG_CACHED_VADDR + XCHAL_KSEG_CACHED_SIZE) ? \
187 (unsigned)(a) - XCHAL_KSEG_CACHED_VADDR + XCHAL_KSEG_CACHED_PADDR : \
188 (unsigned)(a))
189
190#define BYPASS_ADDR(a) \
191(((unsigned)(a) >= XCHAL_KSEG_BYPASS_PADDR \
192 && (unsigned)(a) < XCHAL_KSEG_BYPASS_PADDR + XCHAL_KSEG_BYPASS_SIZE) ? \
193 (unsigned)(a) - XCHAL_KSEG_BYPASS_PADDR + XCHAL_KSEG_BYPASS_VADDR : \
194 ((unsigned)(a) >= XCHAL_KSEG_CACHED_PADDR \
195 && (unsigned)(a) < XCHAL_KSEG_CACHED_PADDR + XCHAL_KSEG_CACHED_SIZE) ? \
196 (unsigned)(a) - XCHAL_KSEG_CACHED_PADDR + XCHAL_KSEG_BYPASS_VADDR : \
197 ((unsigned)(a) >= XCHAL_KSEG_CACHED_VADDR \
198 && (unsigned)(a) < XCHAL_KSEG_CACHED_VADDR+XCHAL_KSEG_CACHED_SIZE)? \
199 (unsigned)(a) - XCHAL_KSEG_CACHED_VADDR+XCHAL_KSEG_BYPASS_VADDR: \
200 (unsigned)(a))
201
202#define CACHED_ADDR(a) \
203(((unsigned)(a) >= XCHAL_KSEG_BYPASS_PADDR \
204 && (unsigned)(a) < XCHAL_KSEG_BYPASS_PADDR + XCHAL_KSEG_BYPASS_SIZE) ? \
205 (unsigned)(a) - XCHAL_KSEG_BYPASS_PADDR + XCHAL_KSEG_CACHED_VADDR : \
206 ((unsigned)(a) >= XCHAL_KSEG_CACHED_PADDR \
207 && (unsigned)(a) < XCHAL_KSEG_CACHED_PADDR + XCHAL_KSEG_CACHED_SIZE) ? \
208 (unsigned)(a) - XCHAL_KSEG_CACHED_PADDR + XCHAL_KSEG_CACHED_VADDR : \
209 ((unsigned)(a) >= XCHAL_KSEG_BYPASS_VADDR \
210 && (unsigned)(a) < XCHAL_KSEG_BYPASS_VADDR+XCHAL_KSEG_BYPASS_SIZE) ? \
211 (unsigned)(a) - XCHAL_KSEG_BYPASS_VADDR+XCHAL_KSEG_CACHED_VADDR : \
212 (unsigned)(a))
213
214#define PHYSADDR_IO(a) \
215(((unsigned)(a) >= XCHAL_KIO_BYPASS_VADDR \
216 && (unsigned)(a) < XCHAL_KIO_BYPASS_VADDR + XCHAL_KIO_BYPASS_SIZE) ? \
217 (unsigned)(a) - XCHAL_KIO_BYPASS_VADDR + XCHAL_KIO_BYPASS_PADDR : \
218 ((unsigned)(a) >= XCHAL_KIO_CACHED_VADDR \
219 && (unsigned)(a) < XCHAL_KIO_CACHED_VADDR + XCHAL_KIO_CACHED_SIZE) ? \
220 (unsigned)(a) - XCHAL_KIO_CACHED_VADDR + XCHAL_KIO_CACHED_PADDR : \
221 (unsigned)(a))
222
223#define BYPASS_ADDR_IO(a) \
224(((unsigned)(a) >= XCHAL_KIO_BYPASS_PADDR \
225 && (unsigned)(a) < XCHAL_KIO_BYPASS_PADDR + XCHAL_KIO_BYPASS_SIZE) ? \
226 (unsigned)(a) - XCHAL_KIO_BYPASS_PADDR + XCHAL_KIO_BYPASS_VADDR : \
227 ((unsigned)(a) >= XCHAL_KIO_CACHED_PADDR \
228 && (unsigned)(a) < XCHAL_KIO_CACHED_PADDR + XCHAL_KIO_CACHED_SIZE) ? \
229 (unsigned)(a) - XCHAL_KIO_CACHED_PADDR + XCHAL_KIO_BYPASS_VADDR : \
230 ((unsigned)(a) >= XCHAL_KIO_CACHED_VADDR \
231 && (unsigned)(a) < XCHAL_KIO_CACHED_VADDR + XCHAL_KIO_CACHED_SIZE) ? \
232 (unsigned)(a) - XCHAL_KIO_CACHED_VADDR + XCHAL_KIO_BYPASS_VADDR : \
233 (unsigned)(a))
234
235#define CACHED_ADDR_IO(a) \
236(((unsigned)(a) >= XCHAL_KIO_BYPASS_PADDR \
237 && (unsigned)(a) < XCHAL_KIO_BYPASS_PADDR + XCHAL_KIO_BYPASS_SIZE) ? \
238 (unsigned)(a) - XCHAL_KIO_BYPASS_PADDR + XCHAL_KIO_CACHED_VADDR : \
239 ((unsigned)(a) >= XCHAL_KIO_CACHED_PADDR \
240 && (unsigned)(a) < XCHAL_KIO_CACHED_PADDR + XCHAL_KIO_CACHED_SIZE) ? \
241 (unsigned)(a) - XCHAL_KIO_CACHED_PADDR + XCHAL_KIO_CACHED_VADDR : \
242 ((unsigned)(a) >= XCHAL_KIO_BYPASS_VADDR \
243 && (unsigned)(a) < XCHAL_KIO_BYPASS_VADDR + XCHAL_KIO_BYPASS_SIZE) ? \
244 (unsigned)(a) - XCHAL_KIO_BYPASS_VADDR + XCHAL_KIO_CACHED_VADDR : \
245 (unsigned)(a))
246
247#endif /* _XTENSA_ADDRSPACE_H */
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