95 lines
2.1 KiB
C
95 lines
2.1 KiB
C
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/* Fallback functions when the main IOMMU code is not compiled in. This
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code is roughly equivalent to i386. */
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#include <linux/mm.h>
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#include <linux/init.h>
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#include <linux/pci.h>
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#include <linux/string.h>
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#include <asm/proto.h>
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#include <asm/processor.h>
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int iommu_merge = 0;
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EXPORT_SYMBOL(iommu_merge);
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dma_addr_t bad_dma_address;
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EXPORT_SYMBOL(bad_dma_address);
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int iommu_bio_merge = 0;
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EXPORT_SYMBOL(iommu_bio_merge);
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int iommu_sac_force = 0;
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EXPORT_SYMBOL(iommu_sac_force);
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/*
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* Dummy IO MMU functions
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*/
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void *dma_alloc_coherent(struct device *hwdev, size_t size,
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dma_addr_t *dma_handle, unsigned gfp)
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{
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void *ret;
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u64 mask;
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int order = get_order(size);
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if (hwdev)
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mask = hwdev->coherent_dma_mask & *hwdev->dma_mask;
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else
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mask = 0xffffffff;
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for (;;) {
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ret = (void *)__get_free_pages(gfp, order);
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if (ret == NULL)
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return NULL;
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*dma_handle = virt_to_bus(ret);
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if ((*dma_handle & ~mask) == 0)
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break;
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free_pages((unsigned long)ret, order);
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if (gfp & GFP_DMA)
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return NULL;
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gfp |= GFP_DMA;
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}
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memset(ret, 0, size);
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return ret;
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}
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EXPORT_SYMBOL(dma_alloc_coherent);
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void dma_free_coherent(struct device *hwdev, size_t size,
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void *vaddr, dma_addr_t dma_handle)
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{
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free_pages((unsigned long)vaddr, get_order(size));
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}
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EXPORT_SYMBOL(dma_free_coherent);
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int dma_supported(struct device *hwdev, u64 mask)
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{
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/*
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* we fall back to GFP_DMA when the mask isn't all 1s,
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* so we can't guarantee allocations that must be
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* within a tighter range than GFP_DMA..
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* RED-PEN this won't work for pci_map_single. Caller has to
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* use GFP_DMA in the first place.
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*/
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if (mask < 0x00ffffff)
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return 0;
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return 1;
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}
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EXPORT_SYMBOL(dma_supported);
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int dma_get_cache_alignment(void)
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{
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return boot_cpu_data.x86_clflush_size;
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}
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EXPORT_SYMBOL(dma_get_cache_alignment);
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static int __init check_ram(void)
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{
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if (end_pfn >= 0xffffffff>>PAGE_SHIFT) {
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printk(
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KERN_ERR "WARNING more than 4GB of memory but IOMMU not compiled in.\n"
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KERN_ERR "WARNING 32bit PCI may malfunction.\n");
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}
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return 0;
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}
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__initcall(check_ram);
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