linux/include/asm-x86_64/pci.h

#ifndef __x8664_PCI_H
#define __x8664_PCI_H

#include <linux/config.h>
#include <asm/io.h>

#ifdef __KERNEL__

#include <linux/mm.h> /* for struct page */

/* Can be used to override the logic in pci_scan_bus for skipping
   already-configured bus numbers - to be used for buggy BIOSes
   or architectures with incomplete PCI setup by the loader */

#ifdef CONFIG_PCI
extern unsigned int pcibios_assign_all_busses(void);
#else
#define pcibios_assign_all_busses()	0
#endif
#define pcibios_scan_all_fns(a, b)	0

extern unsigned long pci_mem_start;
#define PCIBIOS_MIN_IO		0x1000
#define PCIBIOS_MIN_MEM		(pci_mem_start)

#define PCIBIOS_MIN_CARDBUS_IO	0x4000

void pcibios_config_init(void);
struct pci_bus * pcibios_scan_root(int bus);
extern int (*pci_config_read)(int seg, int bus, int dev, int fn, int reg, int len, u32 *value);
extern int (*pci_config_write)(int seg, int bus, int dev, int fn, int reg, int len, u32 value);

void pcibios_set_master(struct pci_dev *dev);
void pcibios_penalize_isa_irq(int irq, int active);
struct irq_routing_table *pcibios_get_irq_routing_table(void);
int pcibios_set_irq_routing(struct pci_dev *dev, int pin, int irq);

#include <linux/types.h>
#include <linux/slab.h>
#include <asm/scatterlist.h>
#include <linux/string.h>
#include <asm/page.h>
#include <linux/dma-mapping.h> /* for have_iommu */

extern int iommu_setup(char *opt);

/* The PCI address space does equal the physical memory
 * address space.  The networking and block device layers use
 * this boolean for bounce buffer decisions
 *
 * On AMD64 it mostly equals, but we set it to zero if a hardware
 * IOMMU (gart) of sotware IOMMU (swiotlb) is available.
 */
#define PCI_DMA_BUS_IS_PHYS (dma_ops->is_phys)

#ifdef CONFIG_GART_IOMMU

/*
 * x86-64 always supports DAC, but sometimes it is useful to force
 * devices through the IOMMU to get automatic sg list merging.
 * Optional right now.
 */
extern int iommu_sac_force;
#define pci_dac_dma_supported(pci_dev, mask)	(!iommu_sac_force)

#define DECLARE_PCI_UNMAP_ADDR(ADDR_NAME)	\
	dma_addr_t ADDR_NAME;
#define DECLARE_PCI_UNMAP_LEN(LEN_NAME)		\
	__u32 LEN_NAME;
#define pci_unmap_addr(PTR, ADDR_NAME)			\
	((PTR)->ADDR_NAME)
#define pci_unmap_addr_set(PTR, ADDR_NAME, VAL)		\
	(((PTR)->ADDR_NAME) = (VAL))
#define pci_unmap_len(PTR, LEN_NAME)			\
	((PTR)->LEN_NAME)
#define pci_unmap_len_set(PTR, LEN_NAME, VAL)		\
	(((PTR)->LEN_NAME) = (VAL))

#else
/* No IOMMU */

#define pci_dac_dma_supported(pci_dev, mask)    1

#define DECLARE_PCI_UNMAP_ADDR(ADDR_NAME)
#define DECLARE_PCI_UNMAP_LEN(LEN_NAME)
#define pci_unmap_addr(PTR, ADDR_NAME)		(0)
#define pci_unmap_addr_set(PTR, ADDR_NAME, VAL)	do { } while (0)
#define pci_unmap_len(PTR, LEN_NAME)		(0)
#define pci_unmap_len_set(PTR, LEN_NAME, VAL)	do { } while (0)

#endif

#include <asm-generic/pci-dma-compat.h>

static inline dma64_addr_t
pci_dac_page_to_dma(struct pci_dev *pdev, struct page *page, unsigned long offset, int direction)
{
	return ((dma64_addr_t) page_to_phys(page) +
		(dma64_addr_t) offset);
}

static inline struct page *
pci_dac_dma_to_page(struct pci_dev *pdev, dma64_addr_t dma_addr)
{
	return virt_to_page(__va(dma_addr)); 	
}

static inline unsigned long
pci_dac_dma_to_offset(struct pci_dev *pdev, dma64_addr_t dma_addr)
{
	return (dma_addr & ~PAGE_MASK);
}

static inline void
pci_dac_dma_sync_single_for_cpu(struct pci_dev *pdev, dma64_addr_t dma_addr, size_t len, int direction)
{
}

static inline void
pci_dac_dma_sync_single_for_device(struct pci_dev *pdev, dma64_addr_t dma_addr, size_t len, int direction)
{
	flush_write_buffers();
}

#ifdef CONFIG_PCI
static inline void pci_dma_burst_advice(struct pci_dev *pdev,
					enum pci_dma_burst_strategy *strat,
					unsigned long *strategy_parameter)
{
	*strat = PCI_DMA_BURST_INFINITY;
	*strategy_parameter = ~0UL;
}
#endif

#define HAVE_PCI_MMAP
extern int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
			       enum pci_mmap_state mmap_state, int write_combine);

static inline void pcibios_add_platform_entries(struct pci_dev *dev)
{
}

#endif /* __KERNEL__ */

/* generic pci stuff */
#ifdef CONFIG_PCI
#include <asm-generic/pci.h>
#endif

#endif /* __x8664_PCI_H */