Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx
[linux-2.6.git] / arch / frv / include / asm / highmem.h
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
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
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 */