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1 | /* highmem.h: virtual kernel memory mappings for high memory |
2 | * | |
3 | * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * - Derived from include/asm-i386/highmem.h | |
6 | * | |
7 | * See Documentation/fujitsu/frv/mmu-layout.txt for more information. | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * as published by the Free Software Foundation; either version | |
12 | * 2 of the License, or (at your option) any later version. | |
13 | */ | |
14 | ||
15 | #ifndef _ASM_HIGHMEM_H | |
16 | #define _ASM_HIGHMEM_H | |
17 | ||
18 | #ifdef __KERNEL__ | |
19 | ||
20 | #include <linux/config.h> | |
21 | #include <linux/init.h> | |
22 | #include <asm/mem-layout.h> | |
23 | #include <asm/spr-regs.h> | |
24 | #include <asm/mb-regs.h> | |
25 | ||
26 | #define NR_TLB_LINES 64 /* number of lines in the TLB */ | |
27 | ||
28 | #ifndef __ASSEMBLY__ | |
29 | ||
30 | #include <linux/interrupt.h> | |
31 | #include <asm/kmap_types.h> | |
32 | #include <asm/pgtable.h> | |
33 | ||
34 | #ifdef CONFIG_DEBUG_HIGHMEM | |
35 | #define HIGHMEM_DEBUG 1 | |
36 | #else | |
37 | #define HIGHMEM_DEBUG 0 | |
38 | #endif | |
39 | ||
40 | /* declarations for highmem.c */ | |
41 | extern unsigned long highstart_pfn, highend_pfn; | |
42 | ||
43 | #define kmap_prot PAGE_KERNEL | |
44 | #define kmap_pte ______kmap_pte_in_TLB | |
45 | extern pte_t *pkmap_page_table; | |
46 | ||
47 | #define flush_cache_kmaps() do { } while (0) | |
48 | ||
49 | /* | |
50 | * Right now we initialize only a single pte table. It can be extended | |
51 | * easily, subsequent pte tables have to be allocated in one physical | |
52 | * chunk of RAM. | |
53 | */ | |
54 | #define LAST_PKMAP PTRS_PER_PTE | |
55 | #define LAST_PKMAP_MASK (LAST_PKMAP - 1) | |
56 | #define PKMAP_NR(virt) ((virt - PKMAP_BASE) >> PAGE_SHIFT) | |
57 | #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) | |
58 | ||
59 | extern void *kmap_high(struct page *page); | |
60 | extern void kunmap_high(struct page *page); | |
61 | ||
62 | extern void *kmap(struct page *page); | |
63 | extern void kunmap(struct page *page); | |
64 | ||
65 | extern struct page *kmap_atomic_to_page(void *ptr); | |
66 | ||
67 | #endif /* !__ASSEMBLY__ */ | |
68 | ||
69 | /* | |
70 | * The use of kmap_atomic/kunmap_atomic is discouraged - kmap/kunmap | |
71 | * gives a more generic (and caching) interface. But kmap_atomic can | |
72 | * be used in IRQ contexts, so in some (very limited) cases we need | |
73 | * it. | |
74 | */ | |
75 | #define KMAP_ATOMIC_CACHE_DAMR 8 | |
76 | ||
77 | #ifndef __ASSEMBLY__ | |
78 | ||
79 | #define __kmap_atomic_primary(type, paddr, ampr) \ | |
80 | ({ \ | |
81 | unsigned long damlr, dampr; \ | |
82 | \ | |
83 | dampr = paddr | xAMPRx_L | xAMPRx_M | xAMPRx_S | xAMPRx_SS_16Kb | xAMPRx_V; \ | |
84 | \ | |
85 | if (type != __KM_CACHE) \ | |
86 | asm volatile("movgs %0,dampr"#ampr :: "r"(dampr)); \ | |
87 | else \ | |
88 | asm volatile("movgs %0,iampr"#ampr"\n" \ | |
89 | "movgs %0,dampr"#ampr"\n" \ | |
90 | :: "r"(dampr) \ | |
91 | ); \ | |
92 | \ | |
93 | asm("movsg damlr"#ampr",%0" : "=r"(damlr)); \ | |
94 | \ | |
95 | /*printk("DAMR"#ampr": PRIM sl=%d L=%08lx P=%08lx\n", type, damlr, dampr);*/ \ | |
96 | \ | |
97 | (void *) damlr; \ | |
98 | }) | |
99 | ||
100 | #define __kmap_atomic_secondary(slot, paddr) \ | |
101 | ({ \ | |
102 | unsigned long damlr = KMAP_ATOMIC_SECONDARY_FRAME + (slot) * PAGE_SIZE; \ | |
103 | unsigned long dampr = paddr | xAMPRx_L | xAMPRx_M | xAMPRx_S | xAMPRx_SS_16Kb | xAMPRx_V; \ | |
104 | \ | |
105 | asm volatile("movgs %0,tplr \n" \ | |
106 | "movgs %1,tppr \n" \ | |
107 | "tlbpr %0,gr0,#2,#1" \ | |
108 | : : "r"(damlr), "r"(dampr)); \ | |
109 | \ | |
110 | /*printk("TLB: SECN sl=%d L=%08lx P=%08lx\n", slot, damlr, dampr);*/ \ | |
111 | \ | |
112 | (void *) damlr; \ | |
113 | }) | |
114 | ||
115 | static inline void *kmap_atomic(struct page *page, enum km_type type) | |
116 | { | |
117 | unsigned long paddr; | |
118 | ||
119 | preempt_disable(); | |
120 | paddr = page_to_phys(page); | |
121 | ||
122 | switch (type) { | |
123 | case 0: return __kmap_atomic_primary(0, paddr, 2); | |
124 | case 1: return __kmap_atomic_primary(1, paddr, 3); | |
125 | case 2: return __kmap_atomic_primary(2, paddr, 4); | |
126 | case 3: return __kmap_atomic_primary(3, paddr, 5); | |
127 | case 4: return __kmap_atomic_primary(4, paddr, 6); | |
128 | case 5: return __kmap_atomic_primary(5, paddr, 7); | |
129 | case 6: return __kmap_atomic_primary(6, paddr, 8); | |
130 | case 7: return __kmap_atomic_primary(7, paddr, 9); | |
131 | case 8: return __kmap_atomic_primary(8, paddr, 10); | |
132 | ||
133 | case 9 ... 9 + NR_TLB_LINES - 1: | |
134 | return __kmap_atomic_secondary(type - 9, paddr); | |
135 | ||
136 | default: | |
137 | BUG(); | |
138 | return 0; | |
139 | } | |
140 | } | |
141 | ||
142 | #define __kunmap_atomic_primary(type, ampr) \ | |
143 | do { \ | |
144 | asm volatile("movgs gr0,dampr"#ampr"\n"); \ | |
145 | if (type == __KM_CACHE) \ | |
146 | asm volatile("movgs gr0,iampr"#ampr"\n"); \ | |
147 | } while(0) | |
148 | ||
149 | #define __kunmap_atomic_secondary(slot, vaddr) \ | |
150 | do { \ | |
151 | asm volatile("tlbpr %0,gr0,#4,#1" : : "r"(vaddr)); \ | |
152 | } while(0) | |
153 | ||
154 | static inline void kunmap_atomic(void *kvaddr, enum km_type type) | |
155 | { | |
156 | switch (type) { | |
157 | case 0: __kunmap_atomic_primary(0, 2); break; | |
158 | case 1: __kunmap_atomic_primary(1, 3); break; | |
159 | case 2: __kunmap_atomic_primary(2, 4); break; | |
160 | case 3: __kunmap_atomic_primary(3, 5); break; | |
161 | case 4: __kunmap_atomic_primary(4, 6); break; | |
162 | case 5: __kunmap_atomic_primary(5, 7); break; | |
163 | case 6: __kunmap_atomic_primary(6, 8); break; | |
164 | case 7: __kunmap_atomic_primary(7, 9); break; | |
165 | case 8: __kunmap_atomic_primary(8, 10); break; | |
166 | ||
167 | case 9 ... 9 + NR_TLB_LINES - 1: | |
168 | __kunmap_atomic_secondary(type - 9, kvaddr); | |
169 | break; | |
170 | ||
171 | default: | |
172 | BUG(); | |
173 | } | |
174 | preempt_enable(); | |
175 | } | |
176 | ||
177 | #endif /* !__ASSEMBLY__ */ | |
178 | ||
179 | #endif /* __KERNEL__ */ | |
180 | ||
181 | #endif /* _ASM_HIGHMEM_H */ |