!C99Shell v. 1.0 pre-release build #13!

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uname -a: Linux snow.he.net 4.4.276-v2-mono-1 #1 SMP Wed Jul 21 11:21:17 PDT 2021 i686 

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Viewing file:     pci-dma.c (1.03 KB)      -rw-r--r--
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/* 
 * Copyright (C) 2001 David J. Mckay (david.mckay@st.com)
 *
 * May be copied or modified under the terms of the GNU General Public
 * License.  See linux/COPYING for more information.                            
 *
 * Dynamic DMA mapping support.
 */

#include <linux/types.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/pci.h>
#include <asm/io.h>
#include <asm/addrspace.h>


void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size,
               dma_addr_t * dma_handle)
{
    void *ret;
    int gfp = GFP_ATOMIC;

    ret = (void *) __get_free_pages(gfp, get_order(size));

    if (ret != NULL) {
            /* Is it neccessary to do the memset? */
        memset(ret, 0, size);
        *dma_handle = virt_to_bus(ret);
    }
    /* We must flush the cache before we pass it on to the device */
    dma_cache_wback_inv(ret, size);
    return  P2SEGADDR(ret);
}

void pci_free_consistent(struct pci_dev *hwdev, size_t size,
             void *vaddr, dma_addr_t dma_handle)
{
        unsigned long p1addr=P1SEGADDR((unsigned long)vaddr);

    free_pages(p1addr, get_order(size));
}

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