FreeBSD/Linux Kernel Cross Reference
sys/compat/linuxkpi/common/include/linux/page.h

     /*-
      * Copyright (c) 2010 Isilon Systems, Inc.
      * Copyright (c) 2010 iX Systems, Inc.
      * Copyright (c) 2010 Panasas, Inc.
      * Copyright (c) 2013-2016 Mellanox Technologies, Ltd.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice unmodified, this list of conditions, and the following
     *    disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    #ifndef _LINUXKPI_LINUX_PAGE_H_
    #define _LINUXKPI_LINUX_PAGE_H_
    
    #include <linux/types.h>
    
    #include <sys/param.h>
    #include <sys/vmmeter.h>
    
    #include <machine/atomic.h>
    #include <vm/vm.h>
    #include <vm/vm_page.h>
    #include <vm/pmap.h>
    
    #if defined(__i386__) || defined(__amd64__)
    #include <machine/md_var.h>
    #endif
    
    typedef unsigned long linux_pte_t;
    typedef unsigned long linux_pmd_t;
    typedef unsigned long linux_pgd_t;
    typedef unsigned long pgprot_t;
    
    #define page    vm_page
    
    #define LINUXKPI_PROT_VALID (1 << 3)
    #define LINUXKPI_CACHE_MODE_SHIFT 4
    
    CTASSERT((VM_PROT_ALL & -LINUXKPI_PROT_VALID) == 0);
    
    #define PAGE_KERNEL_IO  0x0000
    
    static inline pgprot_t
    cachemode2protval(vm_memattr_t attr)
    {
            return ((attr << LINUXKPI_CACHE_MODE_SHIFT) | LINUXKPI_PROT_VALID);
    }
    
    static inline vm_memattr_t
    pgprot2cachemode(pgprot_t prot)
    {
            if (prot & LINUXKPI_PROT_VALID)
                    return (prot >> LINUXKPI_CACHE_MODE_SHIFT);
            else
                    return (VM_MEMATTR_DEFAULT);
    }
    
    #define virt_to_page(x)         PHYS_TO_VM_PAGE(vtophys(x))
    #define page_to_pfn(pp)         (VM_PAGE_TO_PHYS(pp) >> PAGE_SHIFT)
    #define pfn_to_page(pfn)        (PHYS_TO_VM_PAGE((pfn) << PAGE_SHIFT))
    #define nth_page(page,n)        pfn_to_page(page_to_pfn(page) + (n))
    #define page_to_phys(page)      VM_PAGE_TO_PHYS(page)
    
    #define clear_page(page)                memset(page, 0, PAGE_SIZE)
    #define pgprot_noncached(prot)          \
            (((prot) & VM_PROT_ALL) | cachemode2protval(VM_MEMATTR_UNCACHEABLE))
    #ifdef VM_MEMATTR_WRITE_COMBINING
    #define pgprot_writecombine(prot)       \
            (((prot) & VM_PROT_ALL) | cachemode2protval(VM_MEMATTR_WRITE_COMBINING))
    #else
    #define pgprot_writecombine(prot)       pgprot_noncached(prot)
    #endif
    
    #undef  PAGE_MASK
    #define PAGE_MASK       (~(PAGE_SIZE-1))
    /*
     * Modifying PAGE_MASK in the above way breaks trunc_page, round_page,
     * and btoc macros. Therefore, redefine them in a way that makes sense
     * so the LinuxKPI consumers don't get totally broken behavior.
     */
   #undef  btoc
   #define btoc(x) (((vm_offset_t)(x) + PAGE_SIZE - 1) >> PAGE_SHIFT)
   #undef  round_page
   #define round_page(x)   ((((uintptr_t)(x)) + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1))
   #undef  trunc_page
   #define trunc_page(x)   ((uintptr_t)(x) & ~(PAGE_SIZE - 1))
   
   #if defined(__i386__) || defined(__amd64__)
   #undef clflush
   #undef clflushopt
   static inline void
   lkpi_clflushopt(unsigned long addr)
   {
           if (cpu_stdext_feature & CPUID_STDEXT_CLFLUSHOPT)
                   clflushopt(addr);
           else if (cpu_feature & CPUID_CLFSH)
                   clflush(addr);
           else
                   pmap_invalidate_cache();
   }
   #define clflush(x)      clflush((unsigned long)(x))
   #define clflushopt(x)   lkpi_clflushopt((unsigned long)(x))
   
   static inline void
   clflush_cache_range(void *addr, unsigned int size)
   {
           pmap_force_invalidate_cache_range((vm_offset_t)addr,
               (vm_offset_t)addr + size);
   }
   #endif
   
   #endif  /* _LINUXKPI_LINUX_PAGE_H_ */

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