1 /* highmem.h: virtual kernel memory mappings for high memory
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
7 * See Documentation/fujitsu/frv/mmu-layout.txt for more information.
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.
15 #ifndef _ASM_HIGHMEM_H
16 #define _ASM_HIGHMEM_H
20 #include <linux/init.h>
21 #include <asm/mem-layout.h>
22 #include <asm/spr-regs.h>
23 #include <asm/mb-regs.h>
25 #define NR_TLB_LINES 64 /* number of lines in the TLB */
29 #include <linux/interrupt.h>
30 #include <asm/kmap_types.h>
31 #include <asm/pgtable.h>
33 #ifdef CONFIG_DEBUG_HIGHMEM
34 #define HIGHMEM_DEBUG 1
36 #define HIGHMEM_DEBUG 0
39 /* declarations for highmem.c */
40 extern unsigned long highstart_pfn
, highend_pfn
;
42 #define kmap_prot PAGE_KERNEL
43 #define kmap_pte ______kmap_pte_in_TLB
44 extern pte_t
*pkmap_page_table
;
46 #define flush_cache_kmaps() do { } while (0)
49 * Right now we initialize only a single pte table. It can be extended
50 * easily, subsequent pte tables have to be allocated in one physical
53 #define LAST_PKMAP PTRS_PER_PTE
54 #define LAST_PKMAP_MASK (LAST_PKMAP - 1)
55 #define PKMAP_NR(virt) ((virt - PKMAP_BASE) >> PAGE_SHIFT)
56 #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT))
58 extern void *kmap_high(struct page
*page
);
59 extern void kunmap_high(struct page
*page
);
61 extern void *kmap(struct page
*page
);
62 extern void kunmap(struct page
*page
);
64 extern struct page
*kmap_atomic_to_page(void *ptr
);
66 #endif /* !__ASSEMBLY__ */
69 * The use of kmap_atomic/kunmap_atomic is discouraged - kmap/kunmap
70 * gives a more generic (and caching) interface. But kmap_atomic can
71 * be used in IRQ contexts, so in some (very limited) cases we need
74 #define KMAP_ATOMIC_CACHE_DAMR 8
78 #define __kmap_atomic_primary(type, paddr, ampr) \
80 unsigned long damlr, dampr; \
82 dampr = paddr | xAMPRx_L | xAMPRx_M | xAMPRx_S | xAMPRx_SS_16Kb | xAMPRx_V; \
84 if (type != __KM_CACHE) \
85 asm volatile("movgs %0,dampr"#ampr :: "r"(dampr) : "memory"); \
87 asm volatile("movgs %0,iampr"#ampr"\n" \
88 "movgs %0,dampr"#ampr"\n" \
89 :: "r"(dampr) : "memory" \
92 asm("movsg damlr"#ampr",%0" : "=r"(damlr)); \
94 /*printk("DAMR"#ampr": PRIM sl=%d L=%08lx P=%08lx\n", type, damlr, dampr);*/ \
99 #define __kmap_atomic_secondary(slot, paddr) \
101 unsigned long damlr = KMAP_ATOMIC_SECONDARY_FRAME + (slot) * PAGE_SIZE; \
102 unsigned long dampr = paddr | xAMPRx_L | xAMPRx_M | xAMPRx_S | xAMPRx_SS_16Kb | xAMPRx_V; \
104 asm volatile("movgs %0,tplr \n" \
106 "tlbpr %0,gr0,#2,#1" \
107 : : "r"(damlr), "r"(dampr) : "memory"); \
109 /*printk("TLB: SECN sl=%d L=%08lx P=%08lx\n", slot, damlr, dampr);*/ \
114 static inline void *kmap_atomic(struct page
*page
, enum km_type type
)
119 paddr
= page_to_phys(page
);
122 case 0: return __kmap_atomic_primary(0, paddr
, 2);
123 case 1: return __kmap_atomic_primary(1, paddr
, 3);
124 case 2: return __kmap_atomic_primary(2, paddr
, 4);
125 case 3: return __kmap_atomic_primary(3, paddr
, 5);
126 case 4: return __kmap_atomic_primary(4, paddr
, 6);
127 case 5: return __kmap_atomic_primary(5, paddr
, 7);
128 case 6: return __kmap_atomic_primary(6, paddr
, 8);
129 case 7: return __kmap_atomic_primary(7, paddr
, 9);
130 case 8: return __kmap_atomic_primary(8, paddr
, 10);
132 case 9 ... 9 + NR_TLB_LINES
- 1:
133 return __kmap_atomic_secondary(type
- 9, paddr
);
141 #define __kunmap_atomic_primary(type, ampr) \
143 asm volatile("movgs gr0,dampr"#ampr"\n" ::: "memory"); \
144 if (type == __KM_CACHE) \
145 asm volatile("movgs gr0,iampr"#ampr"\n" ::: "memory"); \
148 #define __kunmap_atomic_secondary(slot, vaddr) \
150 asm volatile("tlbpr %0,gr0,#4,#1" : : "r"(vaddr) : "memory"); \
153 static inline void kunmap_atomic(void *kvaddr
, enum km_type type
)
156 case 0: __kunmap_atomic_primary(0, 2); break;
157 case 1: __kunmap_atomic_primary(1, 3); break;
158 case 2: __kunmap_atomic_primary(2, 4); break;
159 case 3: __kunmap_atomic_primary(3, 5); break;
160 case 4: __kunmap_atomic_primary(4, 6); break;
161 case 5: __kunmap_atomic_primary(5, 7); break;
162 case 6: __kunmap_atomic_primary(6, 8); break;
163 case 7: __kunmap_atomic_primary(7, 9); break;
164 case 8: __kunmap_atomic_primary(8, 10); break;
166 case 9 ... 9 + NR_TLB_LINES
- 1:
167 __kunmap_atomic_secondary(type
- 9, kvaddr
);
176 #endif /* !__ASSEMBLY__ */
178 #endif /* __KERNEL__ */
180 #endif /* _ASM_HIGHMEM_H */
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