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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/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
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
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 */