From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- arch/x86_64/kernel/pci-nommu.c | 94 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 94 insertions(+) create mode 100644 arch/x86_64/kernel/pci-nommu.c (limited to 'arch/x86_64/kernel/pci-nommu.c') diff --git a/arch/x86_64/kernel/pci-nommu.c b/arch/x86_64/kernel/pci-nommu.c new file mode 100644 index 00000000000..67d90b89af0 --- /dev/null +++ b/arch/x86_64/kernel/pci-nommu.c @@ -0,0 +1,94 @@ +/* Fallback functions when the main IOMMU code is not compiled in. This + code is roughly equivalent to i386. */ +#include +#include +#include +#include +#include +#include + +int iommu_merge = 0; +EXPORT_SYMBOL(iommu_merge); + +dma_addr_t bad_dma_address; +EXPORT_SYMBOL(bad_dma_address); + +int iommu_bio_merge = 0; +EXPORT_SYMBOL(iommu_bio_merge); + +int iommu_sac_force = 0; +EXPORT_SYMBOL(iommu_sac_force); + +/* + * Dummy IO MMU functions + */ + +void *dma_alloc_coherent(struct device *hwdev, size_t size, + dma_addr_t *dma_handle, unsigned gfp) +{ + void *ret; + u64 mask; + int order = get_order(size); + + if (hwdev) + mask = hwdev->coherent_dma_mask & *hwdev->dma_mask; + else + mask = 0xffffffff; + for (;;) { + ret = (void *)__get_free_pages(gfp, order); + if (ret == NULL) + return NULL; + *dma_handle = virt_to_bus(ret); + if ((*dma_handle & ~mask) == 0) + break; + free_pages((unsigned long)ret, order); + if (gfp & GFP_DMA) + return NULL; + gfp |= GFP_DMA; + } + + memset(ret, 0, size); + return ret; +} +EXPORT_SYMBOL(dma_alloc_coherent); + +void dma_free_coherent(struct device *hwdev, size_t size, + void *vaddr, dma_addr_t dma_handle) +{ + free_pages((unsigned long)vaddr, get_order(size)); +} +EXPORT_SYMBOL(dma_free_coherent); + +int dma_supported(struct device *hwdev, u64 mask) +{ + /* + * we fall back to GFP_DMA when the mask isn't all 1s, + * so we can't guarantee allocations that must be + * within a tighter range than GFP_DMA.. + * RED-PEN this won't work for pci_map_single. Caller has to + * use GFP_DMA in the first place. + */ + if (mask < 0x00ffffff) + return 0; + + return 1; +} +EXPORT_SYMBOL(dma_supported); + +int dma_get_cache_alignment(void) +{ + return boot_cpu_data.x86_clflush_size; +} +EXPORT_SYMBOL(dma_get_cache_alignment); + +static int __init check_ram(void) +{ + if (end_pfn >= 0xffffffff>>PAGE_SHIFT) { + printk( + KERN_ERR "WARNING more than 4GB of memory but IOMMU not compiled in.\n" + KERN_ERR "WARNING 32bit PCI may malfunction.\n"); + } + return 0; +} +__initcall(check_ram); + -- cgit v1.2.3-70-g09d2