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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 necessary to do the memset? */ memset(ret, 0, size); *dma_handle = virt_to_phys(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)); } |