C++ page_to_phys函数代码示例

unsigned long *crst_table_alloc(struct mm_struct *mm, int noexec)
{
	struct page *page = alloc_pages(GFP_KERNEL, ALLOC_ORDER);

	if (!page)
		return NULL;
	page->index = 0;
	if (noexec) {
		struct page *shadow = alloc_pages(GFP_KERNEL, ALLOC_ORDER);
		if (!shadow) {
			__free_pages(page, ALLOC_ORDER);
			return NULL;
		}
		page->index = page_to_phys(shadow);
	}
	return (unsigned long *) page_to_phys(page);
}

static dma_addr_t arc_dma_map_page(struct device *dev, struct page *page,
		unsigned long offset, size_t size, enum dma_data_direction dir,
		unsigned long attrs)
{
	phys_addr_t paddr = page_to_phys(page) + offset;
	_dma_cache_sync(paddr, size, dir);
	return plat_phys_to_dma(dev, paddr);
}

dma_addr_t dma_map_page(struct device *dev, struct page *page,
			unsigned long offset, size_t size,
			enum dma_data_direction dir)
{
	dma_addr_t handle = page_to_phys(page) + offset;

	dma_sync_single_for_device(dev, handle, size, dir);
	return handle;
}

static void tegra114_flush_dcache(struct page *page, unsigned long offset,
				  size_t size)
{
	phys_addr_t phys = page_to_phys(page) + offset;
	void *virt = page_address(page) + offset;

	__cpuc_flush_dcache_area(virt, size);
	outer_flush_range(phys, phys + size);
}

static phys_addr_t kvm_kaddr_to_phys(void *kaddr)
{
	if (!is_vmalloc_addr(kaddr)) {
		BUG_ON(!virt_addr_valid(kaddr));
		return __pa(kaddr);
	} else {
		return page_to_phys(vmalloc_to_page(kaddr)) +
		       offset_in_page(kaddr);
	}
}

void *dma_generic_alloc_coherent(struct device *dev, size_t size,
				 dma_addr_t *dma_addr, gfp_t flag,
				 struct dma_attrs *attrs)
{
	unsigned long dma_mask;
	struct page *page;
	unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
	dma_addr_t addr;

	dma_mask = dma_alloc_coherent_mask(dev, flag);

	flag &= ~__GFP_ZERO;
again:
	page = NULL;
	/* CMA can be used only in the context which permits sleeping */
	if (flag & __GFP_WAIT) {
		page = dma_alloc_from_contiguous(dev, count, get_order(size));
		if (page && page_to_phys(page) + size > dma_mask) {
			dma_release_from_contiguous(dev, page, count);
			page = NULL;
		}
	}
	/* fallback */
	if (!page)
		page = alloc_pages_node(dev_to_node(dev), flag, get_order(size));
	if (!page)
		return NULL;

	addr = page_to_phys(page);
	if (addr + size > dma_mask) {
		__free_pages(page, get_order(size));

		if (dma_mask < DMA_BIT_MASK(32) && !(flag & GFP_DMA)) {
			flag = (flag & ~GFP_DMA32) | GFP_DMA;
			goto again;
		}

		return NULL;
	}
	memset(page_address(page), 0, size);
	*dma_addr = addr;
	return page_address(page);
}

static void *ion_page_pool_alloc_pages(struct ion_page_pool *pool)
{
	struct page *page = alloc_pages(pool->gfp_mask, pool->order);

	if (!page)
		return NULL;
	dma_sync_single_for_device(NULL, (dma_addr_t)page_to_phys(page),
		PAGE_SIZE << pool->order, DMA_BIDIRECTIONAL);
	return page;
}

static inline void kmap_invalidate_coherent(struct page *page,
					    unsigned long vaddr)
{
	if (!DCACHE_ALIAS_EQ(page_to_phys(page), vaddr)) {
		unsigned long kvaddr;

		if (!PageHighMem(page)) {
			kvaddr = (unsigned long)page_to_virt(page);

			__invalidate_dcache_page(kvaddr);
		} else {
			kvaddr = TLBTEMP_BASE_1 +
				(page_to_phys(page) & DCACHE_ALIAS_MASK);

			__invalidate_dcache_page_alias(kvaddr,
						       page_to_phys(page));
		}
	}
}

/*
 * Do normal kexec
 */
static void __do_machine_kexec(void *data)
{
	relocate_kernel_t data_mover;
	struct kimage *image = data;

	data_mover = (relocate_kernel_t) page_to_phys(image->control_code_page);

	/* Call the moving routine */
	(*data_mover)(&image->head, image->start);
}

static int i460_insert_memory_small_io_page (struct agp_memory *mem,
				off_t pg_start, int type)
{
	unsigned long paddr, io_pg_start, io_page_size;
	int i, j, k, num_entries;
	void *temp;

	pr_debug("i460_insert_memory_small_io_page(mem=%p, pg_start=%ld, type=%d, paddr0=0x%lx)\n",
		 mem, pg_start, type, page_to_phys(mem->pages[0]));

	if (type >= AGP_USER_TYPES || mem->type >= AGP_USER_TYPES)
		return -EINVAL;

	io_pg_start = I460_IOPAGES_PER_KPAGE * pg_start;

	temp = agp_bridge->current_size;
	num_entries = A_SIZE_8(temp)->num_entries;

	if ((io_pg_start + I460_IOPAGES_PER_KPAGE * mem->page_count) > num_entries) {
		printk(KERN_ERR PFX "Looks like we're out of AGP memory\n");
		return -EINVAL;
	}

	j = io_pg_start;
	while (j < (io_pg_start + I460_IOPAGES_PER_KPAGE * mem->page_count)) {
		if (!PGE_EMPTY(agp_bridge, RD_GATT(j))) {
			pr_debug("i460_insert_memory_small_io_page: GATT[%d]=0x%x is busy\n",
				 j, RD_GATT(j));
			return -EBUSY;
		}
		j++;
	}

	io_page_size = 1UL << I460_IO_PAGE_SHIFT;
	for (i = 0, j = io_pg_start; i < mem->page_count; i++) {
		paddr = page_to_phys(mem->pages[i]);
		for (k = 0; k < I460_IOPAGES_PER_KPAGE; k++, j++, paddr += io_page_size)
			WR_GATT(j, i460_mask_memory(agp_bridge, paddr, mem->type));
	}
	WR_FLUSH_GATT(j - 1);
	return 0;
}

static dma_addr_t
__mic_dma_map_page(struct device *dev, struct page *page, unsigned long offset,
		   size_t size, enum dma_data_direction dir,
		   struct dma_attrs *attrs)
{
	void *va = phys_to_virt(page_to_phys(page)) + offset;
	struct scif_hw_dev *scdev = dev_get_drvdata(dev);
	struct mic_device *mdev = scdev_to_mdev(scdev);

	return mic_map_single(mdev, va, size);
}

unsigned long *crst_table_alloc(struct mm_struct *mm, int noexec)
{
	struct page *page = alloc_pages(GFP_KERNEL, ALLOC_ORDER);

	if (!page)
		return NULL;
	page->index = 0;
	if (noexec) {
		struct page *shadow = alloc_pages(GFP_KERNEL, ALLOC_ORDER);
		if (!shadow) {
			__free_pages(page, ALLOC_ORDER);
			return NULL;
		}
		page->index = page_to_phys(shadow);
	}
	spin_lock(&mm->page_table_lock);
	list_add(&page->lru, &mm->context.crst_list);
	spin_unlock(&mm->page_table_lock);
	return (unsigned long *) page_to_phys(page);
}

void flush_cache_page(struct vm_area_struct* vma, unsigned long address,
    		      unsigned long pfn)
{
	

	unsigned long phys = page_to_phys(pfn_to_page(pfn));
	unsigned long virt = TLBTEMP_BASE_1 + (address & DCACHE_ALIAS_MASK);

	__flush_invalidate_dcache_page_alias(virt, phys);
	__invalidate_icache_page_alias(virt, phys);
}

void local_flush_cache_page(struct vm_area_struct *vma, unsigned long address,
		      unsigned long pfn)
{
	/* Note that we have to use the 'alias' address to avoid multi-hit */

	unsigned long phys = page_to_phys(pfn_to_page(pfn));
	unsigned long virt = TLBTEMP_BASE_1 + (address & DCACHE_ALIAS_MASK);

	__flush_invalidate_dcache_page_alias(virt, phys);
	__invalidate_icache_page_alias(virt, phys);
}

static int pci_direct_map_sg(struct pci_dev *hwdev, struct scatterlist *sg,
		int nents, enum dma_data_direction direction)
{
	int i;

	for (i = 0; i < nents; i++, sg++) {
		sg->dma_address = page_to_phys(sg->page) + sg->offset;
		sg->dma_length = sg->length;
	}

	return nents;
}