Logo Search packages:      
Sourcecode: linux version File versions  Download package

highmem.h

/* highmem.h: virtual kernel memory mappings for high memory
 *
 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 * - Derived from include/asm-i386/highmem.h
 *
 * See Documentation/frv/mmu-layout.txt for more information.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#ifndef _ASM_HIGHMEM_H
#define _ASM_HIGHMEM_H

#ifdef __KERNEL__

#include <linux/init.h>
#include <linux/highmem.h>
#include <asm/mem-layout.h>
#include <asm/spr-regs.h>
#include <asm/mb-regs.h>

#define NR_TLB_LINES          64    /* number of lines in the TLB */

#ifndef __ASSEMBLY__

#include <linux/interrupt.h>
#include <asm/kmap_types.h>
#include <asm/pgtable.h>

#ifdef CONFIG_DEBUG_HIGHMEM
#define HIGHMEM_DEBUG 1
#else
#define HIGHMEM_DEBUG 0
#endif

/* declarations for highmem.c */
extern unsigned long highstart_pfn, highend_pfn;

#define kmap_prot PAGE_KERNEL
#define kmap_pte ______kmap_pte_in_TLB
extern pte_t *pkmap_page_table;

#define flush_cache_kmaps()  do { } while (0)

/*
 * Right now we initialize only a single pte table. It can be extended
 * easily, subsequent pte tables have to be allocated in one physical
 * chunk of RAM.
 */
#define LAST_PKMAP      PTRS_PER_PTE
#define LAST_PKMAP_MASK (LAST_PKMAP - 1)
#define PKMAP_NR(virt)  ((virt - PKMAP_BASE) >> PAGE_SHIFT)
#define PKMAP_ADDR(nr)  (PKMAP_BASE + ((nr) << PAGE_SHIFT))

extern void *kmap_high(struct page *page);
extern void kunmap_high(struct page *page);

extern void *kmap(struct page *page);
extern void kunmap(struct page *page);

extern struct page *kmap_atomic_to_page(void *ptr);

#endif /* !__ASSEMBLY__ */

/*
 * The use of kmap_atomic/kunmap_atomic is discouraged - kmap/kunmap
 * gives a more generic (and caching) interface. But kmap_atomic can
 * be used in IRQ contexts, so in some (very limited) cases we need
 * it.
 */
#define KMAP_ATOMIC_CACHE_DAMR            8

#ifndef __ASSEMBLY__

#define __kmap_atomic_primary(type, paddr, ampr)                                    \
({                                                                      \
      unsigned long damlr, dampr;                                             \
                                                                        \
      dampr = paddr | xAMPRx_L | xAMPRx_M | xAMPRx_S | xAMPRx_SS_16Kb | xAMPRx_V;         \
                                                                        \
      if (type != __KM_CACHE)                                                 \
            asm volatile("movgs %0,dampr"#ampr :: "r"(dampr) : "memory");                 \
      else                                                              \
            asm volatile("movgs %0,iampr"#ampr"\n"                                  \
                       "movgs %0,dampr"#ampr"\n"                                    \
                       :: "r"(dampr) : "memory"                               \
                       );                                                     \
                                                                        \
      asm("movsg damlr"#ampr",%0" : "=r"(damlr));                                   \
                                                                        \
      /*printk("DAMR"#ampr": PRIM sl=%d L=%08lx P=%08lx\n", type, damlr, dampr);*/        \
                                                                        \
      (void *) damlr;                                                         \
})

#define __kmap_atomic_secondary(slot, paddr)                                          \
({                                                                        \
      unsigned long damlr = KMAP_ATOMIC_SECONDARY_FRAME + (slot) * PAGE_SIZE;               \
      unsigned long dampr = paddr | xAMPRx_L | xAMPRx_M | xAMPRx_S | xAMPRx_SS_16Kb | xAMPRx_V; \
                                                                          \
      asm volatile("movgs %0,tplr \n"                                                 \
                 "movgs %1,tppr \n"                                             \
                 "tlbpr %0,gr0,#2,#1"                                           \
                 : : "r"(damlr), "r"(dampr) : "memory");                              \
                                                                          \
      /*printk("TLB: SECN sl=%d L=%08lx P=%08lx\n", slot, damlr, dampr);*/                  \
                                                                          \
      (void *) damlr;                                                           \
})

static inline void *kmap_atomic_primary(struct page *page, enum km_type type)
{
      unsigned long paddr;

      pagefault_disable();
      paddr = page_to_phys(page);

      switch (type) {
        case 0:         return __kmap_atomic_primary(0, paddr, 2);
        case 1:         return __kmap_atomic_primary(1, paddr, 3);
        case 2:         return __kmap_atomic_primary(2, paddr, 4);
        case 3:         return __kmap_atomic_primary(3, paddr, 5);

      default:
            BUG();
            return NULL;
      }
}

#define __kunmap_atomic_primary(type, ampr)                       \
do {                                                  \
      asm volatile("movgs gr0,dampr"#ampr"\n" ::: "memory");            \
      if (type == __KM_CACHE)                               \
            asm volatile("movgs gr0,iampr"#ampr"\n" ::: "memory");      \
} while(0)

#define __kunmap_atomic_secondary(slot, vaddr)                    \
do {                                                  \
      asm volatile("tlbpr %0,gr0,#4,#1" : : "r"(vaddr) : "memory");     \
} while(0)

static inline void kunmap_atomic_primary(void *kvaddr, enum km_type type)
{
      switch (type) {
        case 0:         __kunmap_atomic_primary(0, 2);      break;
        case 1:         __kunmap_atomic_primary(1, 3);      break;
        case 2:         __kunmap_atomic_primary(2, 4);      break;
        case 3:         __kunmap_atomic_primary(3, 5);      break;

      default:
            BUG();
      }
      pagefault_enable();
}

void *__kmap_atomic(struct page *page);
void __kunmap_atomic(void *kvaddr);

#endif /* !__ASSEMBLY__ */

#endif /* __KERNEL__ */

#endif /* _ASM_HIGHMEM_H */

Generated by  Doxygen 1.6.0   Back to index