C++ (Cpp) arm_lpae_restrict_pgsizesの例

コード例 #1

ファイル: io-pgtable-arm.c プロジェクト: Chong-Li/cse522

static struct arm_lpae_io_pgtable *
arm_lpae_alloc_pgtable(struct io_pgtable_cfg *cfg)
{
	unsigned long va_bits, pgd_bits;
	struct arm_lpae_io_pgtable *data;

	arm_lpae_restrict_pgsizes(cfg);

	if (!(cfg->pgsize_bitmap & (SZ_4K | SZ_16K | SZ_64K)))
		return NULL;

	if (cfg->ias > ARM_LPAE_MAX_ADDR_BITS)
		return NULL;

	if (cfg->oas > ARM_LPAE_MAX_ADDR_BITS)
		return NULL;

	if (!selftest_running && cfg->iommu_dev->dma_pfn_offset) {
		dev_err(cfg->iommu_dev, "Cannot accommodate DMA offset for IOMMU page tables\n");
		return NULL;
	}

	data = kmalloc(sizeof(*data), GFP_KERNEL);
	if (!data)
		return NULL;

	data->pg_shift = __ffs(cfg->pgsize_bitmap);
	data->bits_per_level = data->pg_shift - ilog2(sizeof(arm_lpae_iopte));

	va_bits = cfg->ias - data->pg_shift;
	data->levels = DIV_ROUND_UP(va_bits, data->bits_per_level);

	/* Calculate the actual size of our pgd (without concatenation) */
	pgd_bits = va_bits - (data->bits_per_level * (data->levels - 1));
	data->pgd_size = 1UL << (pgd_bits + ilog2(sizeof(arm_lpae_iopte)));

	data->iop.ops = (struct io_pgtable_ops) {
		.map		= arm_lpae_map,
		.unmap		= arm_lpae_unmap,
		.iova_to_phys	= arm_lpae_iova_to_phys,
	};

	return data;
}

コード例 #2

ファイル: io-pgtable-arm.c プロジェクト: avpatel/xvisor-next

static struct arm_lpae_io_pgtable *
arm_lpae_alloc_pgtable(struct io_pgtable_cfg *cfg)
{
	unsigned long va_bits, pgd_bits;
	struct arm_lpae_io_pgtable *data;

	arm_lpae_restrict_pgsizes(cfg);

	if (!(cfg->pgsize_bitmap & (SZ_4K | SZ_16K | SZ_64K)))
		return NULL;

	if (cfg->ias > ARM_LPAE_MAX_ADDR_BITS)
		return NULL;

	if (cfg->oas > ARM_LPAE_MAX_ADDR_BITS)
		return NULL;

	data = vmm_zalloc(sizeof(*data));
	if (!data)
		return NULL;

	data->pg_shift = __ffs(cfg->pgsize_bitmap);
	data->bits_per_level = data->pg_shift - ilog2(sizeof(arm_lpae_iopte));

	va_bits = cfg->ias - data->pg_shift;
	data->levels = DIV_ROUND_UP(va_bits, data->bits_per_level);

	/* Calculate the actual size of our pgd (without concatenation) */
	pgd_bits = va_bits - (data->bits_per_level * (data->levels - 1));
	data->pgd_size = 1UL << (pgd_bits + ilog2(sizeof(arm_lpae_iopte)));

	data->iop.ops = (struct io_pgtable_ops) {
		.map		= arm_lpae_map,
		.unmap		= arm_lpae_unmap,
		.iova_to_phys	= arm_lpae_iova_to_phys,
	};

	return data;
}