linux/include/asm-frv/highmem.h
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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 <asm/mem-layout.h>
  22#include <asm/spr-regs.h>
  23#include <asm/mb-regs.h>
  24
  25#define NR_TLB_LINES            64      /* number of lines in the TLB */
  26
  27#ifndef __ASSEMBLY__
  28
  29#include <linux/interrupt.h>
  30#include <asm/kmap_types.h>
  31#include <asm/pgtable.h>
  32
  33#ifdef CONFIG_DEBUG_HIGHMEM
  34#define HIGHMEM_DEBUG 1
  35#else
  36#define HIGHMEM_DEBUG 0
  37#endif
  38
  39/* declarations for highmem.c */
  40extern unsigned long highstart_pfn, highend_pfn;
  41
  42#define kmap_prot PAGE_KERNEL
  43#define kmap_pte ______kmap_pte_in_TLB
  44extern pte_t *pkmap_page_table;
  45
  46#define flush_cache_kmaps()  do { } while (0)
  47
  48/*
  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
  51 * chunk of RAM.
  52 */
  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))
  57
  58extern void *kmap_high(struct page *page);
  59extern void kunmap_high(struct page *page);
  60
  61extern void *kmap(struct page *page);
  62extern void kunmap(struct page *page);
  63
  64extern struct page *kmap_atomic_to_page(void *ptr);
  65
  66#endif /* !__ASSEMBLY__ */
  67
  68/*
  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
  72 * it.
  73 */
  74#define KMAP_ATOMIC_CACHE_DAMR          8
  75
  76#ifndef __ASSEMBLY__
  77
  78#define __kmap_atomic_primary(type, paddr, ampr)                                                \
  79({                                                                                              \
  80        unsigned long damlr, dampr;                                                             \
  81                                                                                                \
  82        dampr = paddr | xAMPRx_L | xAMPRx_M | xAMPRx_S | xAMPRx_SS_16Kb | xAMPRx_V;             \
  83                                                                                                \
  84        if (type != __KM_CACHE)                                                                 \
  85                asm volatile("movgs %0,dampr"#ampr :: "r"(dampr) : "memory");                   \
  86        else                                                                                    \
  87                asm volatile("movgs %0,iampr"#ampr"\n"                                          \
  88                             "movgs %0,dampr"#ampr"\n"                                          \
  89                             :: "r"(dampr) : "memory"                                           \
  90                             );                                                                 \
  91                                                                                                \
  92        asm("movsg damlr"#ampr",%0" : "=r"(damlr));                                             \
  93                                                                                                \
  94        /*printk("DAMR"#ampr": PRIM sl=%d L=%08lx P=%08lx\n", type, damlr, dampr);*/            \
  95                                                                                                \
  96        (void *) damlr;                                                                         \
  97})
  98
  99#define __kmap_atomic_secondary(slot, paddr)                                                      \
 100({                                                                                                \
 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; \
 103                                                                                                  \
 104        asm volatile("movgs %0,tplr \n"                                                           \
 105                     "movgs %1,tppr \n"                                                           \
 106                     "tlbpr %0,gr0,#2,#1"                                                         \
 107                     : : "r"(damlr), "r"(dampr) : "memory");                                      \
 108                                                                                                  \
 109        /*printk("TLB: SECN sl=%d L=%08lx P=%08lx\n", slot, damlr, dampr);*/                      \
 110                                                                                                  \
 111        (void *) damlr;                                                                           \
 112})
 113
 114static inline void *kmap_atomic(struct page *page, enum km_type type)
 115{
 116        unsigned long paddr;
 117
 118        pagefault_disable();
 119        paddr = page_to_phys(page);
 120
 121        switch (type) {
 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);
 131
 132        case 9 ... 9 + NR_TLB_LINES - 1:
 133                return __kmap_atomic_secondary(type - 9, paddr);
 134
 135        default:
 136                BUG();
 137                return NULL;
 138        }
 139}
 140
 141#define __kunmap_atomic_primary(type, ampr)                             \
 142do {                                                                    \
 143        asm volatile("movgs gr0,dampr"#ampr"\n" ::: "memory");          \
 144        if (type == __KM_CACHE)                                         \
 145                asm volatile("movgs gr0,iampr"#ampr"\n" ::: "memory");  \
 146} while(0)
 147
 148#define __kunmap_atomic_secondary(slot, vaddr)                          \
 149do {                                                                    \
 150        asm volatile("tlbpr %0,gr0,#4,#1" : : "r"(vaddr) : "memory");   \
 151} while(0)
 152
 153static inline void kunmap_atomic(void *kvaddr, enum km_type type)
 154{
 155        switch (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;
 165
 166        case 9 ... 9 + NR_TLB_LINES - 1:
 167                __kunmap_atomic_secondary(type - 9, kvaddr);
 168                break;
 169
 170        default:
 171                BUG();
 172        }
 173        pagefault_enable();
 174}
 175
 176#endif /* !__ASSEMBLY__ */
 177
 178#endif /* __KERNEL__ */
 179
 180#endif /* _ASM_HIGHMEM_H */
 181