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/* * Copyright (C) 2000 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. * * On the overdrive, we can only DMA from memory behind the PCI bus! * this means that all DMA'able memory must come from there. * this restriction will not apply to later boards. */ #include <linux/types.h> #include <linux/mm.h> #include <linux/string.h> #include <linux/pci.h> #include <asm/io.h> void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size, dma_addr_t * dma_handle) { void *ret; int gfp = GFP_ATOMIC; printk("BUG: pci_alloc_consistent() called - not yet supported\n"); /* We ALWAYS need DMA memory on the overdrive hardware, * due to it's extreme wierdness * Need to flush the cache here as well, since the memory * can still be seen through the cache! */ gfp |= GFP_DMA; ret = (void *) __get_free_pages(gfp, get_order(size)); if (ret != NULL) { memset(ret, 0, size); *dma_handle = virt_to_bus(ret); } return ret; } void pci_free_consistent(struct pci_dev *hwdev, size_t size, void *vaddr, dma_addr_t dma_handle) { free_pages((unsigned long) vaddr, get_order(size)); } |