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/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/init.h>
21 #include <linux/highmem.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) : "memory"); \
87 else \
88 asm volatile("movgs %0,iampr"#ampr"\n" \
89 "movgs %0,dampr"#ampr"\n" \
90 :: "r"(dampr) : "memory" \
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) : "memory"); \
109 \
110 /*printk("TLB: SECN sl=%d L=%08lx P=%08lx\n", slot, damlr, dampr);*/ \
111 \
112 (void *) damlr; \
113 })
114
kmap_atomic_primary(struct page * page,enum km_type type)115 static inline void *kmap_atomic_primary(struct page *page, enum km_type type)
116 {
117 unsigned long paddr;
118
119 pagefault_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
128 default:
129 BUG();
130 return NULL;
131 }
132 }
133
134 #define __kunmap_atomic_primary(type, ampr) \
135 do { \
136 asm volatile("movgs gr0,dampr"#ampr"\n" ::: "memory"); \
137 if (type == __KM_CACHE) \
138 asm volatile("movgs gr0,iampr"#ampr"\n" ::: "memory"); \
139 } while(0)
140
141 #define __kunmap_atomic_secondary(slot, vaddr) \
142 do { \
143 asm volatile("tlbpr %0,gr0,#4,#1" : : "r"(vaddr) : "memory"); \
144 } while(0)
145
kunmap_atomic_primary(void * kvaddr,enum km_type type)146 static inline void kunmap_atomic_primary(void *kvaddr, enum km_type type)
147 {
148 switch (type) {
149 case 0: __kunmap_atomic_primary(0, 2); break;
150 case 1: __kunmap_atomic_primary(1, 3); break;
151 case 2: __kunmap_atomic_primary(2, 4); break;
152 case 3: __kunmap_atomic_primary(3, 5); break;
153
154 default:
155 BUG();
156 }
157 pagefault_enable();
158 }
159
160 void *__kmap_atomic(struct page *page);
161 void __kunmap_atomic(void *kvaddr);
162
163 #endif /* !__ASSEMBLY__ */
164
165 #endif /* __KERNEL__ */
166
167 #endif /* _ASM_HIGHMEM_H */
168