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/config.h>
21 #include <linux/init.h>
22 #include <asm/mem-layout.h>
23 #include <asm/spr-regs.h>
24 #include <asm/mb-regs.h>
26 #define NR_TLB_LINES 64 /* number of lines in the TLB */
30 #include <linux/interrupt.h>
31 #include <asm/kmap_types.h>
32 #include <asm/pgtable.h>
34 #ifdef CONFIG_DEBUG_HIGHMEM
35 #define HIGHMEM_DEBUG 1
37 #define HIGHMEM_DEBUG 0
40 /* declarations for highmem.c */
41 extern unsigned long highstart_pfn, highend_pfn;
43 #define kmap_prot PAGE_KERNEL
44 #define kmap_pte ______kmap_pte_in_TLB
45 extern pte_t *pkmap_page_table;
47 extern void kmap_init(void);
49 #define flush_cache_kmaps() do { } while (0)
52 * Right now we initialize only a single pte table. It can be extended
53 * easily, subsequent pte tables have to be allocated in one physical
56 #define LAST_PKMAP PTRS_PER_PTE
57 #define LAST_PKMAP_MASK (LAST_PKMAP - 1)
58 #define PKMAP_NR(virt) ((virt - PKMAP_BASE) >> PAGE_SHIFT)
59 #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT))
61 extern void *kmap_high(struct page *page);
62 extern void kunmap_high(struct page *page);
64 extern void *kmap(struct page *page);
65 extern void kunmap(struct page *page);
67 extern struct page *kmap_atomic_to_page(void *ptr);
69 #endif /* !__ASSEMBLY__ */
72 * The use of kmap_atomic/kunmap_atomic is discouraged - kmap/kunmap
73 * gives a more generic (and caching) interface. But kmap_atomic can
74 * be used in IRQ contexts, so in some (very limited) cases we need
77 #define KMAP_ATOMIC_CACHE_DAMR 8
81 #define __kmap_atomic_primary(type, paddr, ampr) \
83 unsigned long damlr, dampr; \
85 dampr = paddr | xAMPRx_L | xAMPRx_M | xAMPRx_S | xAMPRx_SS_16Kb | xAMPRx_V; \
87 if (type != __KM_CACHE) \
88 asm volatile("movgs %0,dampr"#ampr :: "r"(dampr)); \
90 asm volatile("movgs %0,iampr"#ampr"\n" \
91 "movgs %0,dampr"#ampr"\n" \
95 asm("movsg damlr"#ampr",%0" : "=r"(damlr)); \
97 /*printk("DAMR"#ampr": PRIM sl=%d L=%08lx P=%08lx\n", type, damlr, dampr);*/ \
102 #define __kmap_atomic_secondary(slot, paddr) \
104 unsigned long damlr = KMAP_ATOMIC_SECONDARY_FRAME + (slot) * PAGE_SIZE; \
105 unsigned long dampr = paddr | xAMPRx_L | xAMPRx_M | xAMPRx_S | xAMPRx_SS_16Kb | xAMPRx_V; \
107 asm volatile("movgs %0,tplr \n" \
109 "tlbpr %0,gr0,#2,#1" \
110 : : "r"(damlr), "r"(dampr)); \
112 /*printk("TLB: SECN sl=%d L=%08lx P=%08lx\n", slot, damlr, dampr);*/ \
117 static inline void *kmap_atomic(struct page *page, enum km_type type)
122 paddr = page_to_phys(page);
125 case 0: return __kmap_atomic_primary(0, paddr, 2);
126 case 1: return __kmap_atomic_primary(1, paddr, 3);
127 case 2: return __kmap_atomic_primary(2, paddr, 4);
128 case 3: return __kmap_atomic_primary(3, paddr, 5);
129 case 4: return __kmap_atomic_primary(4, paddr, 6);
130 case 5: return __kmap_atomic_primary(5, paddr, 7);
131 case 6: return __kmap_atomic_primary(6, paddr, 8);
132 case 7: return __kmap_atomic_primary(7, paddr, 9);
133 case 8: return __kmap_atomic_primary(8, paddr, 10);
135 case 9 ... 9 + NR_TLB_LINES - 1:
136 return __kmap_atomic_secondary(type - 9, paddr);
144 #define __kunmap_atomic_primary(type, ampr) \
146 asm volatile("movgs gr0,dampr"#ampr"\n"); \
147 if (type == __KM_CACHE) \
148 asm volatile("movgs gr0,iampr"#ampr"\n"); \
151 #define __kunmap_atomic_secondary(slot, vaddr) \
153 asm volatile("tlbpr %0,gr0,#4,#1" : : "r"(vaddr)); \
156 static inline void kunmap_atomic(void *kvaddr, enum km_type type)
159 case 0: __kunmap_atomic_primary(0, 2); break;
160 case 1: __kunmap_atomic_primary(1, 3); break;
161 case 2: __kunmap_atomic_primary(2, 4); break;
162 case 3: __kunmap_atomic_primary(3, 5); break;
163 case 4: __kunmap_atomic_primary(4, 6); break;
164 case 5: __kunmap_atomic_primary(5, 7); break;
165 case 6: __kunmap_atomic_primary(6, 8); break;
166 case 7: __kunmap_atomic_primary(7, 9); break;
167 case 8: __kunmap_atomic_primary(8, 10); break;
169 case 9 ... 9 + NR_TLB_LINES - 1:
170 __kunmap_atomic_secondary(type - 9, kvaddr);
179 #endif /* !__ASSEMBLY__ */
181 #endif /* __KERNEL__ */
183 #endif /* _ASM_HIGHMEM_H */