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Directory :  /usr/src/linux-headers-3.13.0-170/arch/arm/include/asm/xen/

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Current File : /usr/src/linux-headers-3.13.0-170/arch/arm/include/asm/xen/page.h
#ifndef _ASM_ARM_XEN_PAGE_H
#define _ASM_ARM_XEN_PAGE_H

#include <asm/page.h>
#include <asm/pgtable.h>

#include <linux/pfn.h>
#include <linux/types.h>
#include <linux/dma-mapping.h>

#include <xen/xen.h>
#include <xen/interface/grant_table.h>

#define phys_to_machine_mapping_valid(pfn) (1)
#define mfn_to_virt(m)			(__va(mfn_to_pfn(m) << PAGE_SHIFT))

#define pte_mfn	    pte_pfn
#define mfn_pte	    pfn_pte

/* Xen machine address */
typedef struct xmaddr {
	phys_addr_t maddr;
} xmaddr_t;

/* Xen pseudo-physical address */
typedef struct xpaddr {
	phys_addr_t paddr;
} xpaddr_t;

#define XMADDR(x)	((xmaddr_t) { .maddr = (x) })
#define XPADDR(x)	((xpaddr_t) { .paddr = (x) })

#define INVALID_P2M_ENTRY      (~0UL)

unsigned long __pfn_to_mfn(unsigned long pfn);
unsigned long __mfn_to_pfn(unsigned long mfn);
extern struct rb_root phys_to_mach;

static inline unsigned long pfn_to_mfn(unsigned long pfn)
{
	unsigned long mfn;

	if (phys_to_mach.rb_node != NULL) {
		mfn = __pfn_to_mfn(pfn);
		if (mfn != INVALID_P2M_ENTRY)
			return mfn;
	}

	return pfn;
}

static inline unsigned long mfn_to_pfn(unsigned long mfn)
{
	unsigned long pfn;

	if (phys_to_mach.rb_node != NULL) {
		pfn = __mfn_to_pfn(mfn);
		if (pfn != INVALID_P2M_ENTRY)
			return pfn;
	}

	return mfn;
}

#define mfn_to_local_pfn(mfn) mfn_to_pfn(mfn)

static inline xmaddr_t phys_to_machine(xpaddr_t phys)
{
	unsigned offset = phys.paddr & ~PAGE_MASK;
	return XMADDR(PFN_PHYS(pfn_to_mfn(PFN_DOWN(phys.paddr))) | offset);
}

static inline xpaddr_t machine_to_phys(xmaddr_t machine)
{
	unsigned offset = machine.maddr & ~PAGE_MASK;
	return XPADDR(PFN_PHYS(mfn_to_pfn(PFN_DOWN(machine.maddr))) | offset);
}
/* VIRT <-> MACHINE conversion */
#define virt_to_machine(v)	(phys_to_machine(XPADDR(__pa(v))))
#define virt_to_pfn(v)          (PFN_DOWN(__pa(v)))
#define virt_to_mfn(v)		(pfn_to_mfn(virt_to_pfn(v)))
#define mfn_to_virt(m)		(__va(mfn_to_pfn(m) << PAGE_SHIFT))

static inline xmaddr_t arbitrary_virt_to_machine(void *vaddr)
{
	/* TODO: assuming it is mapped in the kernel 1:1 */
	return virt_to_machine(vaddr);
}

/* TODO: this shouldn't be here but it is because the frontend drivers
 * are using it (its rolled in headers) even though we won't hit the code path.
 * So for right now just punt with this.
 */
static inline pte_t *lookup_address(unsigned long address, unsigned int *level)
{
	BUG();
	return NULL;
}

static inline int m2p_add_override(unsigned long mfn, struct page *page,
		struct gnttab_map_grant_ref *kmap_op)
{
	return 0;
}

static inline int m2p_remove_override(struct page *page, bool clear_pte)
{
	return 0;
}

bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn);
bool __set_phys_to_machine_multi(unsigned long pfn, unsigned long mfn,
		unsigned long nr_pages);

static inline bool set_phys_to_machine(unsigned long pfn, unsigned long mfn)
{
	return __set_phys_to_machine(pfn, mfn);
}

#define xen_remap(cookie, size) ioremap_cache((cookie), (size));

#endif /* _ASM_ARM_XEN_PAGE_H */

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