LXR linux/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 */
  41extern unsigned long highstart_pfn, highend_pfn;
  42
  43#define kmap_prot PAGE_KERNEL
  44#define kmap_pte ______kmap_pte_in_TLB
  45extern 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
  59extern void *kmap_high(struct page *page);
  60extern void kunmap_high(struct page *page);
  61
  62extern void *kmap(struct page *page);
  63extern void kunmap(struct page *page);
  64
  65extern 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
 116static 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)                           \
 127do {                                                                    \
 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)                          \
 134do {                                                                    \
 135        asm volatile("tlbpr %0,gr0,#4,#1" : : "r"(vaddr) : "memory");   \
 136} while(0)
 137
 138static inline void kunmap_atomic_primary(void *kvaddr)
 139{
 140        __kunmap_atomic_primary(1, 2);
 141        pagefault_enable();
 142}
 143
 144void *kmap_atomic(struct page *page);
 145void __kunmap_atomic(void *kvaddr);
 146
 147#endif /* !__ASSEMBLY__ */
 148
 149#endif /* __KERNEL__ */
 150
 151#endif /* _ASM_HIGHMEM_H */
 152