FreeBSD/Linux Kernel Cross Reference
sys/dev/drm/drm_pci.h

     /**
      * \file drm_pci.h
      * \brief PCI consistent, DMA-accessible memory functions.
      *
      * \author Eric Anholt <anholt@FreeBSD.org>
      */
     
     /*-
      * Copyright 2003 Eric Anholt.
     * All Rights Reserved.
     *
     * Permission is hereby granted, free of charge, to any person obtaining a
     * copy of this software and associated documentation files (the "Software"),
     * to deal in the Software without restriction, including without limitation
     * the rights to use, copy, modify, merge, publish, distribute, sublicense,
     * and/or sell copies of the Software, and to permit persons to whom the
     * Software is furnished to do so, subject to the following conditions:
     *
     * The above copyright notice and this permission notice (including the next
     * paragraph) shall be included in all copies or substantial portions of the
     * Software.
     *
     * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
     * AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
     * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
     * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     *
     * $FreeBSD$
     */
    
    #include "dev/drm/drmP.h"
    
    /**********************************************************************/
    /** \name PCI memory */
    /*@{*/
    
    /**
     * \brief Allocate a physically contiguous DMA-accessible consistent 
     * memory block.
     */
    void *
    DRM(pci_alloc)(drm_device_t *dev, size_t size, size_t align, dma_addr_t maxaddr,
        dma_addr_t *busaddr)
    {
            void *vaddr;
    
            vaddr = contigmalloc(size, DRM(M_DRM), M_NOWAIT, 0ul, maxaddr, align,
                0);
            *busaddr = vtophys(vaddr);
            
            return vaddr;
    }
    
    /**
     * \brief Free a DMA-accessible consistent memory block.
     */
    void
    DRM(pci_free)(drm_device_t *dev, size_t size, void *vaddr, dma_addr_t busaddr)
    {
    #if __FreeBSD_version > 500000
            contigfree(vaddr, size, DRM(M_DRM));    /* Not available on 4.x */
    #endif
    }
    
    /*@}*/

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