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(cached, 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 (!cached) \
86 asm volatile("movgs %0,dampr"#ampr :: "r"(dampr) : "memory"); \
87 else \
88 /* cache flush page attachment point */ \
89 asm volatile("movgs %0,iampr"#ampr"\n" \
90 "movgs %0,dampr"#ampr"\n" \
91 :: "r"(dampr) : "memory" \
92 ); \
93 \
94 asm("movsg damlr"#ampr",%0" : "=r"(damlr)); \
95 \
96 /*printk("DAMR"#ampr": PRIM sl=%d L=%08lx P=%08lx\n", type, damlr, dampr);*/ \
97 \
98 (void *) damlr; \
99 })
100
101 #define __kmap_atomic_secondary(slot, paddr) \
102 ({ \
103 unsigned long damlr = KMAP_ATOMIC_SECONDARY_FRAME + (slot) * PAGE_SIZE; \
104 unsigned long dampr = paddr | xAMPRx_L | xAMPRx_M | xAMPRx_S | xAMPRx_SS_16Kb | xAMPRx_V; \
105 \
106 asm volatile("movgs %0,tplr \n" \
107 "movgs %1,tppr \n" \
108 "tlbpr %0,gr0,#2,#1" \
109 : : "r"(damlr), "r"(dampr) : "memory"); \
110 \
111 /*printk("TLB: SECN sl=%d L=%08lx P=%08lx\n", slot, damlr, dampr);*/ \
112 \
113 (void *) damlr; \
114 })
115
kmap_atomic_primary(struct page * page)116 static inline void *kmap_atomic_primary(struct page *page)
117 {
118 unsigned long paddr;
119
120 pagefault_disable();
121 paddr = page_to_phys(page);
122
123 return __kmap_atomic_primary(1, paddr, 2);
124 }
125
126 #define __kunmap_atomic_primary(cached, ampr) \
127 do { \
128 asm volatile("movgs gr0,dampr"#ampr"\n" ::: "memory"); \
129 if (cached) \
130 asm volatile("movgs gr0,iampr"#ampr"\n" ::: "memory"); \
131 } while(0)
132
133 #define __kunmap_atomic_secondary(slot, vaddr) \
134 do { \
135 asm volatile("tlbpr %0,gr0,#4,#1" : : "r"(vaddr) : "memory"); \
136 } while(0)
137
kunmap_atomic_primary(void * kvaddr)138 static inline void kunmap_atomic_primary(void *kvaddr)
139 {
140 __kunmap_atomic_primary(1, 2);
141 pagefault_enable();
142 }
143
144 void *kmap_atomic(struct page *page);
145 void __kunmap_atomic(void *kvaddr);
146
147 #endif /* !__ASSEMBLY__ */
148
149 #endif /* __KERNEL__ */
150
151 #endif /* _ASM_HIGHMEM_H */
152