#ifndef _I386_PAGE_H
#define _I386_PAGE_H

/* PAGE_SHIFT determines the page size */
#define PAGE_SHIFT	12
#define PAGE_SIZE	(1UL << PAGE_SHIFT)
#define PAGE_MASK	(~(PAGE_SIZE-1))

#ifdef __KERNEL__
#ifndef __ASSEMBLY__

#include <linux/config.h>
#include <asm/hypervisor-ifs/hypervisor-if.h>

#ifdef CONFIG_X86_USE_3DNOW

#include <asm/mmx.h>

#define clear_page(page)	mmx_clear_page((void *)(page))
#define copy_page(to,from)	mmx_copy_page(to,from)

#else

/*
 *	On older X86 processors its not a win to use MMX here it seems.
 *	Maybe the K6-III ?
 */
 
#define clear_page(page)	memset((void *)(page), 0, PAGE_SIZE)
#define copy_page(to,from)	memcpy((void *)(to), (void *)(from), PAGE_SIZE)

#endif

#define clear_user_page(page, vaddr)	clear_page(page)
#define copy_user_page(to, from, vaddr)	copy_page(to, from)

/**** MACHINE <-> PHYSICAL CONVERSION MACROS ****/
extern unsigned long *phys_to_machine_mapping;
#define pfn_to_mfn(_pfn) (phys_to_machine_mapping[(_pfn)])
#define mfn_to_pfn(_mfn) (machine_to_phys_mapping[(_mfn)])
static inline unsigned long phys_to_machine(unsigned long phys)
{
    unsigned long machine = pfn_to_mfn(phys >> PAGE_SHIFT);
    machine = (machine << PAGE_SHIFT) | (phys & ~PAGE_MASK);
    return machine;
}
static inline unsigned long machine_to_phys(unsigned long machine)
{
    unsigned long phys = mfn_to_pfn(machine >> PAGE_SHIFT);
    phys = (phys << PAGE_SHIFT) | (machine & ~PAGE_MASK);
    return phys;
}

/*
 * These are used to make use of C type-checking..
 */
#if CONFIG_X86_PAE
typedef struct { unsigned long pte_low, pte_high; } pte_t;
typedef struct { unsigned long long pmd; } pmd_t;
typedef struct { unsigned long long pgd; } pgd_t;
#define pte_val(x)	((x).pte_low | ((unsigned long long)(x).pte_high << 32))
#else
typedef struct { unsigned long pte_low; } pte_t;
typedef struct { unsigned long pmd; } pmd_t;
typedef struct { unsigned long pgd; } pgd_t;
static inline unsigned long pte_val(pte_t x)
{
    unsigned long ret = x.pte_low;
    if ( (ret & 1) ) ret = machine_to_phys(ret);
    return ret;
}
#endif
#define PTE_MASK	PAGE_MASK

typedef struct { unsigned long pgprot; } pgprot_t;

static inline unsigned long pmd_val(pmd_t x)
{
    unsigned long ret = x.pmd;
    if ( (ret & 1) ) ret = machine_to_phys(ret);
    return ret;
}
#define pgd_val(x)	({ BUG(); (unsigned long)0; })
#define pgprot_val(x)	((x).pgprot)

static inline pte_t __pte(unsigned long x)
{
    if ( (x & 1) ) x = phys_to_machine(x);
    return ((pte_t) { (x) });
}
static inline pmd_t __pmd(unsigned long x)
{
    if ( (x & 1) ) x = phys_to_machine(x);
    return ((pmd_t) { (x) });
}
#define __pgd(x) ({ BUG(); (pgprot_t) { 0 }; })
#define __pgprot(x)	((pgprot_t) { (x) } )

#endif /* !__ASSEMBLY__ */

/* to align the pointer to the (next) page boundary */
#define PAGE_ALIGN(addr)	(((addr)+PAGE_SIZE-1)&PAGE_MASK)

/*
 * This handles the memory map.. We could make this a config
 * option, but too many people screw it up, and too few need
 * it.
 *
 * A __PAGE_OFFSET of 0xC0000000 means that the kernel has
 * a virtual address space of one gigabyte, which limits the
 * amount of physical memory you can use to about 950MB. 
 *
 * If you want more physical memory than this then see the CONFIG_HIGHMEM4G
 * and CONFIG_HIGHMEM64G options in the kernel configuration.
 */

#define __PAGE_OFFSET		(0xC0000000)

#ifndef __ASSEMBLY__

/*
 * Tell the user there is some problem. Beep too, so we can
 * see^H^H^Hhear bugs in early bootup as well!
 * The offending file and line are encoded after the "officially
 * undefined" opcode for parsing in the trap handler.
 */

#if 1	/* Set to zero for a slightly smaller kernel */
#define BUG()				\
 __asm__ __volatile__(	"ud2\n"		\
			"\t.word %c0\n"	\
			"\t.long %c1\n"	\
			 : : "i" (__LINE__), "i" (__FILE__))
#else
#define BUG() __asm__ __volatile__("ud2\n")
#endif

#define PAGE_BUG(page) do { \
	BUG(); \
} while (0)

/* Pure 2^n version of get_order */
static __inline__ int get_order(unsigned long size)
{
	int order;

	size = (size-1) >> (PAGE_SHIFT-1);
	order = -1;
	do {
		size >>= 1;
		order++;
	} while (size);
	return order;
}

#endif /* __ASSEMBLY__ */

#define PAGE_OFFSET		((unsigned long)__PAGE_OFFSET)
#define __pa(x)			((unsigned long)(x)-PAGE_OFFSET)
#define __va(x)			((void *)((unsigned long)(x)+PAGE_OFFSET))
#define virt_to_page(kaddr)	(mem_map + (__pa(kaddr) >> PAGE_SHIFT))
#define VALID_PAGE(page)	((page - mem_map) < max_mapnr)

#define VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE | VM_EXEC | \
				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)

/* VIRT <-> MACHINE conversion */
#define virt_to_machine(_a) (phys_to_machine(__pa(_a)))
#define machine_to_virt(_m) (__va(machine_to_phys(_m)))

#endif /* __KERNEL__ */

#endif /* _I386_PAGE_H */