source: trunk/packages/xen-3.1/xen-3.1/linux-2.6-xen-sparse/include/asm-i386/mach-xen/asm/page.h @ 34

#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 CONFIG_X86_PAE
#define __PHYSICAL_MASK_SHIFT   40
#define __PHYSICAL_MASK         ((1ULL << __PHYSICAL_MASK_SHIFT) - 1)
#define PHYSICAL_PAGE_MASK      (~((1ULL << PAGE_SHIFT) - 1) & __PHYSICAL_MASK)
#else
#define __PHYSICAL_MASK_SHIFT   32
#define __PHYSICAL_MASK         (~0UL)
#define PHYSICAL_PAGE_MASK      (PAGE_MASK & __PHYSICAL_MASK)
#endif

#define LARGE_PAGE_MASK (~(LARGE_PAGE_SIZE-1))
#define LARGE_PAGE_SIZE (1UL << PMD_SHIFT)

#ifdef __KERNEL__

/*
 * Need to repeat this here in order to not include pgtable.h (which in turn
 * depends on definitions made here), but to be able to use the symbolic
 * below. The preprocessor will warn if the two definitions aren't identical.
 */
#define _PAGE_PRESENT   0x001

#ifndef __ASSEMBLY__

#include <linux/string.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <asm/bug.h>
#include <xen/interface/xen.h>
#include <xen/features.h>

#define arch_free_page(_page,_order)            \
({      int foreign = PageForeign(_page);       \
        if (foreign)                            \
                PageForeignDestructor(_page);   \
        foreign;                                \
})
#define HAVE_ARCH_FREE_PAGE

#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

#define alloc_zeroed_user_highpage(vma, vaddr) alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO, vma, vaddr)
#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE

/*
 *      On older X86 processors it's 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, pg)        clear_page(page)
#define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)

/*
 * These are used to make use of C type-checking..
 */
extern int nx_enabled;
#ifdef CONFIG_X86_PAE
extern unsigned long long __supported_pte_mask;
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;
typedef struct { unsigned long long pgprot; } pgprot_t;
#define pgprot_val(x)   ((x).pgprot)
#include <asm/maddr.h>
#define __pte(x) ({ unsigned long long _x = (x);        \
    if (_x & _PAGE_PRESENT) _x = pte_phys_to_machine(_x);   \
    ((pte_t) {(unsigned long)(_x), (unsigned long)(_x>>32)}); })
#define __pgd(x) ({ unsigned long long _x = (x); \
    (pgd_t) {((_x) & _PAGE_PRESENT) ? pte_phys_to_machine(_x) : (_x)}; })
#define __pmd(x) ({ unsigned long long _x = (x); \
    (pmd_t) {((_x) & _PAGE_PRESENT) ? pte_phys_to_machine(_x) : (_x)}; })
static inline unsigned long long pte_val_ma(pte_t x)
{
        return ((unsigned long long)x.pte_high << 32) | x.pte_low;
}
static inline unsigned long long pte_val(pte_t x)
{
        unsigned long long ret = pte_val_ma(x);
        if (x.pte_low & _PAGE_PRESENT) ret = pte_machine_to_phys(ret);
        return ret;
}
static inline unsigned long long pmd_val(pmd_t x)
{
        unsigned long long ret = x.pmd;
#if CONFIG_XEN_COMPAT <= 0x030002
        if (ret) ret = pte_machine_to_phys(ret) | _PAGE_PRESENT;
#else
        if (ret & _PAGE_PRESENT) ret = pte_machine_to_phys(ret);
#endif
        return ret;
}
static inline unsigned long long pgd_val(pgd_t x)
{
        unsigned long long ret = x.pgd;
        if (ret & _PAGE_PRESENT) ret = pte_machine_to_phys(ret);
        return ret;
}
#define HPAGE_SHIFT     21
#else
typedef struct { unsigned long pte_low; } pte_t;
typedef struct { unsigned long pgd; } pgd_t;
typedef struct { unsigned long pgprot; } pgprot_t;
#define pgprot_val(x)   ((x).pgprot)
#include <asm/maddr.h>
#define boot_pte_t pte_t /* or would you rather have a typedef */
#define pte_val(x)      (((x).pte_low & _PAGE_PRESENT) ? \
                         machine_to_phys((x).pte_low) : \
                         (x).pte_low)
#define pte_val_ma(x)   ((x).pte_low)
#define __pte(x) ({ unsigned long _x = (x); \
    (pte_t) {((_x) & _PAGE_PRESENT) ? phys_to_machine(_x) : (_x)}; })
#define __pgd(x) ({ unsigned long _x = (x); \
    (pgd_t) {((_x) & _PAGE_PRESENT) ? phys_to_machine(_x) : (_x)}; })
static inline unsigned long pgd_val(pgd_t x)
{
        unsigned long ret = x.pgd;
#if CONFIG_XEN_COMPAT <= 0x030002
        if (ret) ret = machine_to_phys(ret) | _PAGE_PRESENT;
#else
        if (ret & _PAGE_PRESENT) ret = machine_to_phys(ret);
#endif
        return ret;
}
#define HPAGE_SHIFT     22
#endif
#define PTE_MASK        PHYSICAL_PAGE_MASK

#ifdef CONFIG_HUGETLB_PAGE
#define HPAGE_SIZE      ((1UL) << HPAGE_SHIFT)
#define HPAGE_MASK      (~(HPAGE_SIZE - 1))
#define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
#define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
#endif

#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.
 */

#ifndef __ASSEMBLY__

struct vm_area_struct;

/*
 * This much address space is reserved for vmalloc() and iomap()
 * as well as fixmap mappings.
 */
extern unsigned int __VMALLOC_RESERVE;

extern int sysctl_legacy_va_layout;

extern int page_is_ram(unsigned long pagenr);

#endif /* __ASSEMBLY__ */

#ifdef __ASSEMBLY__
#define __PAGE_OFFSET           CONFIG_PAGE_OFFSET
#define __PHYSICAL_START        CONFIG_PHYSICAL_START
#else
#define __PAGE_OFFSET           ((unsigned long)CONFIG_PAGE_OFFSET)
#define __PHYSICAL_START        ((unsigned long)CONFIG_PHYSICAL_START)
#endif
#define __KERNEL_START          (__PAGE_OFFSET + __PHYSICAL_START)

#if CONFIG_XEN_COMPAT <= 0x030002
#undef LOAD_OFFSET
#define LOAD_OFFSET             0
#endif

#define PAGE_OFFSET             ((unsigned long)__PAGE_OFFSET)
#define VMALLOC_RESERVE         ((unsigned long)__VMALLOC_RESERVE)
#define MAXMEM                  (__FIXADDR_TOP-__PAGE_OFFSET-__VMALLOC_RESERVE)
#define __pa(x)                 ((unsigned long)(x)-PAGE_OFFSET)
#define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))
#define pfn_to_kaddr(pfn)      __va((pfn) << PAGE_SHIFT)
#ifdef CONFIG_FLATMEM
#define pfn_valid(pfn)          ((pfn) < max_mapnr)
#endif /* CONFIG_FLATMEM */
#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)

#define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)

#define VM_DATA_DEFAULT_FLAGS \
        (VM_READ | VM_WRITE | \
        ((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0 ) | \
                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)

#include <asm-generic/memory_model.h>
#include <asm-generic/page.h>

#define __HAVE_ARCH_GATE_AREA 1
#endif /* __KERNEL__ */

#endif /* _I386_PAGE_H */