- 根目录:
- arch
- ia64
- include
- asm
- page.h
#ifndef _ASM_IA64_PAGE_H
#define _ASM_IA64_PAGE_H
/*
* Pagetable related stuff.
*
* Copyright (C) 1998, 1999, 2002 Hewlett-Packard Co
* David Mosberger-Tang <davidm@hpl.hp.com>
*/
#include <asm/intrinsics.h>
#include <asm/types.h>
/*
* The top three bits of an IA64 address are its Region Number.
* Different regions are assigned to different purposes.
*/
#define RGN_SHIFT (61)
#define RGN_BASE(r) (__IA64_UL_CONST(r)<<RGN_SHIFT)
#define RGN_BITS (RGN_BASE(-1))
#define RGN_KERNEL 7 /* Identity mapped region */
#define RGN_UNCACHED 6 /* Identity mapped I/O region */
#define RGN_GATE 5 /* Gate page, Kernel text, etc */
#define RGN_HPAGE 4 /* For Huge TLB pages */
/*
* PAGE_SHIFT determines the actual kernel page size.
*/
#if defined(CONFIG_IA64_PAGE_SIZE_4KB)
# define PAGE_SHIFT 12
#elif defined(CONFIG_IA64_PAGE_SIZE_8KB)
# define PAGE_SHIFT 13
#elif defined(CONFIG_IA64_PAGE_SIZE_16KB)
# define PAGE_SHIFT 14
#elif defined(CONFIG_IA64_PAGE_SIZE_64KB)
# define PAGE_SHIFT 16
#else
# error Unsupported page size!
#endif
#define PAGE_SIZE (__IA64_UL_CONST(1) << PAGE_SHIFT)
#define PAGE_MASK (~(PAGE_SIZE - 1))
#define PERCPU_PAGE_SHIFT 18 /* log2() of max. size of per-CPU area */
#define PERCPU_PAGE_SIZE (__IA64_UL_CONST(1) << PERCPU_PAGE_SHIFT)
#ifdef CONFIG_HUGETLB_PAGE
# define HPAGE_REGION_BASE RGN_BASE(RGN_HPAGE)
# define HPAGE_SHIFT hpage_shift
# define HPAGE_SHIFT_DEFAULT 28 /* check ia64 SDM for architecture supported size */
# define HPAGE_SIZE (__IA64_UL_CONST(1) << HPAGE_SHIFT)
# define HPAGE_MASK (~(HPAGE_SIZE - 1))
# define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
#endif /* CONFIG_HUGETLB_PAGE */
#ifdef __ASSEMBLY__
# define __pa(x) ((x) - PAGE_OFFSET)
# define __va(x) ((x) + PAGE_OFFSET)
#else /* !__ASSEMBLY */
# define STRICT_MM_TYPECHECKS
extern void clear_page (void *page);
extern void copy_page (void *to, void *from);
/*
* clear_user_page() and copy_user_page() can't be inline functions because
* flush_dcache_page() can't be defined until later...
*/
#define clear_user_page(addr, vaddr, page) \
do { \
clear_page(addr); \
flush_dcache_page(page); \
} while (0)
#define copy_user_page(to, from, vaddr, page) \
do { \
copy_page((to), (from)); \
flush_dcache_page(page); \
} while (0)
#define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
({ \
struct page *page = alloc_page_vma( \
GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr); \
if (page) \
flush_dcache_page(page); \
page; \
})
#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
#ifdef CONFIG_VIRTUAL_MEM_MAP
extern int ia64_pfn_valid (unsigned long pfn);
#else
# define ia64_pfn_valid(pfn) 1
#endif
#ifdef CONFIG_VIRTUAL_MEM_MAP
extern struct page *vmem_map;
#ifdef CONFIG_DISCONTIGMEM
# define page_to_pfn(page) ((unsigned long) (page - vmem_map))
# define pfn_to_page(pfn) (vmem_map + (pfn))
#else
# include <asm-generic/memory_model.h>
#endif
#else
# include <asm-generic/memory_model.h>
#endif
#ifdef CONFIG_FLATMEM
# define pfn_valid(pfn) (((pfn) < max_mapnr) && ia64_pfn_valid(pfn))
#elif defined(CONFIG_DISCONTIGMEM)
extern unsigned long min_low_pfn;
extern unsigned long max_low_pfn;
# define pfn_valid(pfn) (((pfn) >= min_low_pfn) && ((pfn) < max_low_pfn) && ia64_pfn_valid(pfn))
#endif
#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
typedef union ia64_va {
struct {
unsigned long off : 61; /* intra-region offset */
unsigned long reg : 3; /* region number */
} f;
unsigned long l;
void *p;
} ia64_va;
/*
* Note: These macros depend on the fact that PAGE_OFFSET has all
* region bits set to 1 and all other bits set to zero. They are
* expressed in this way to ensure they result in a single "dep"
* instruction.
*/
#define __pa(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg = 0; _v.l;})
#define __va(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg = -1; _v.p;})
#define REGION_NUMBER(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg;})
#define REGION_OFFSET(x) ({ia64_va _v; _v.l = (long) (x); _v.f.off;})
#ifdef CONFIG_HUGETLB_PAGE
# define htlbpage_to_page(x) (((unsigned long) REGION_NUMBER(x) << 61) \
| (REGION_OFFSET(x) >> (HPAGE_SHIFT-PAGE_SHIFT)))
# define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
extern unsigned int hpage_shift;
#endif
static __inline__ int
get_order (unsigned long size)
{
long double d = size - 1;
long order;
order = ia64_getf_exp(d);
order = order - PAGE_SHIFT - 0xffff + 1;
if (order < 0)
order = 0;
return order;
}
#endif /* !__ASSEMBLY__ */
#ifdef STRICT_MM_TYPECHECKS
/*
* These are used to make use of C type-checking..
*/
typedef struct { unsigned long pte; } pte_t;
typedef struct { unsigned long pmd; } pmd_t;
#if CONFIG_PGTABLE_LEVELS == 4
typedef struct { unsigned long pud; } pud_t;
#endif
typedef struct { unsigned long pgd; } pgd_t;
typedef struct { unsigned long pgprot; } pgprot_t;
typedef struct page *pgtable_t;
# define pte_val(x) ((x).pte)
# define pmd_val(x) ((x).pmd)
#if CONFIG_PGTABLE_LEVELS == 4
# define pud_val(x) ((x).pud)
#endif
# define pgd_val(x) ((x).pgd)
# define pgprot_val(x) ((x).pgprot)
# define __pte(x) ((pte_t) { (x) } )
# define __pmd(x) ((pmd_t) { (x) } )
# define __pgprot(x) ((pgprot_t) { (x) } )
#else /* !STRICT_MM_TYPECHECKS */
/*
* .. while these make it easier on the compiler
*/
# ifndef __ASSEMBLY__
typedef unsigned long pte_t;
typedef unsigned long pmd_t;
typedef unsigned long pgd_t;
typedef unsigned long pgprot_t;
typedef struct page *pgtable_t;
# endif
# define pte_val(x) (x)
# define pmd_val(x) (x)
# define pgd_val(x) (x)
# define pgprot_val(x) (x)
# define __pte(x) (x)
# define __pgd(x) (x)
# define __pgprot(x) (x)
#endif /* !STRICT_MM_TYPECHECKS */
#define PAGE_OFFSET RGN_BASE(RGN_KERNEL)
#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \
VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC | \
(((current->personality & READ_IMPLIES_EXEC) != 0) \
? VM_EXEC : 0))
#define GATE_ADDR RGN_BASE(RGN_GATE)
/*
* 0xa000000000000000+2*PERCPU_PAGE_SIZE
* - 0xa000000000000000+3*PERCPU_PAGE_SIZE remain unmapped (guard page)
*/
#define KERNEL_START (GATE_ADDR+__IA64_UL_CONST(0x100000000))
#define PERCPU_ADDR (-PERCPU_PAGE_SIZE)
#define LOAD_OFFSET (KERNEL_START - KERNEL_TR_PAGE_SIZE)
#define __HAVE_ARCH_GATE_AREA 1
#endif /* _ASM_IA64_PAGE_H */