43 lines
1.0 KiB
C
43 lines
1.0 KiB
C
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/*
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* Copyright (C) 2001 David J. Mckay (david.mckay@st.com)
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*
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* May be copied or modified under the terms of the GNU General Public
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* License. See linux/COPYING for more information.
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*
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* Dynamic DMA mapping support.
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*/
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#include <linux/types.h>
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#include <linux/mm.h>
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#include <linux/string.h>
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#include <linux/pci.h>
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#include <asm/io.h>
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#include <asm/addrspace.h>
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void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size,
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dma_addr_t * dma_handle)
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{
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void *ret;
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int gfp = GFP_ATOMIC;
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ret = (void *) __get_free_pages(gfp, get_order(size));
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if (ret != NULL) {
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/* Is it neccessary to do the memset? */
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memset(ret, 0, size);
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*dma_handle = virt_to_bus(ret);
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}
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/* We must flush the cache before we pass it on to the device */
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flush_cache_all();
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return P2SEGADDR(ret);
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}
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void pci_free_consistent(struct pci_dev *hwdev, size_t size,
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void *vaddr, dma_addr_t dma_handle)
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{
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unsigned long p1addr=P1SEGADDR((unsigned long)vaddr);
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free_pages(p1addr, get_order(size));
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}
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