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# ifndef _ASM_POWERPC_BOOK3S_64_PGTABLE_H_
# define _ASM_POWERPC_BOOK3S_64_PGTABLE_H_
/*
* This file contains the functions and defines necessary to modify and use
* the ppc64 hashed page table .
*/
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# include <asm/book3s/64/hash.h>
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# include <asm/barrier.h>
/*
* The second half of the kernel virtual space is used for IO mappings ,
* it ' s itself carved into the PIO region ( ISA and PHB IO space ) and
* the ioremap space
*
* ISA_IO_BASE = KERN_IO_START , 64 K reserved area
* PHB_IO_BASE = ISA_IO_BASE + 64 K to ISA_IO_BASE + 2 G , PHB IO spaces
* IOREMAP_BASE = ISA_IO_BASE + 2 G to VMALLOC_START + PGTABLE_RANGE
*/
# define KERN_IO_START (KERN_VIRT_START + (KERN_VIRT_SIZE >> 1))
# define FULL_IO_SIZE 0x80000000ul
# define ISA_IO_BASE (KERN_IO_START)
# define ISA_IO_END (KERN_IO_START + 0x10000ul)
# define PHB_IO_BASE (ISA_IO_END)
# define PHB_IO_END (KERN_IO_START + FULL_IO_SIZE)
# define IOREMAP_BASE (PHB_IO_END)
# define IOREMAP_END (KERN_VIRT_START + KERN_VIRT_SIZE)
# define vmemmap ((struct page *)VMEMMAP_BASE)
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/* Advertise special mapping type for AGP */
# define HAVE_PAGE_AGP
/* Advertise support for _PAGE_SPECIAL */
# define __HAVE_ARCH_PTE_SPECIAL
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# ifndef __ASSEMBLY__
/*
* This is the default implementation of various PTE accessors , it ' s
* used in all cases except Book3S with 64 K pages where we have a
* concept of sub - pages
*/
# ifndef __real_pte
# ifdef CONFIG_STRICT_MM_TYPECHECKS
# define __real_pte(e,p) ((real_pte_t){(e)})
# define __rpte_to_pte(r) ((r).pte)
# else
# define __real_pte(e,p) (e)
# define __rpte_to_pte(r) (__pte(r))
# endif
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# define __rpte_to_hidx(r,index) (pte_val(__rpte_to_pte(r)) >>_PAGE_F_GIX_SHIFT)
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# define pte_iterate_hashed_subpages(rpte, psize, va, index, shift) \
do { \
index = 0 ; \
shift = mmu_psize_defs [ psize ] . shift ; \
# define pte_iterate_hashed_end() } while(0)
/*
* We expect this to be called only for user addresses or kernel virtual
* addresses other than the linear mapping .
*/
# define pte_pagesize_index(mm, addr, pte) MMU_PAGE_4K
# endif /* __real_pte */
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static inline void pmd_set ( pmd_t * pmdp , unsigned long val )
{
* pmdp = __pmd ( val ) ;
}
static inline void pmd_clear ( pmd_t * pmdp )
{
* pmdp = __pmd ( 0 ) ;
}
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# define pmd_none(pmd) (!pmd_val(pmd))
# define pmd_present(pmd) (!pmd_none(pmd))
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static inline void pud_set ( pud_t * pudp , unsigned long val )
{
* pudp = __pud ( val ) ;
}
static inline void pud_clear ( pud_t * pudp )
{
* pudp = __pud ( 0 ) ;
}
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# define pud_none(pud) (!pud_val(pud))
# define pud_present(pud) (pud_val(pud) != 0)
extern struct page * pud_page ( pud_t pud ) ;
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extern struct page * pmd_page ( pmd_t pmd ) ;
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static inline pte_t pud_pte ( pud_t pud )
{
return __pte ( pud_val ( pud ) ) ;
}
static inline pud_t pte_pud ( pte_t pte )
{
return __pud ( pte_val ( pte ) ) ;
}
# define pud_write(pud) pte_write(pud_pte(pud))
# define pgd_write(pgd) pte_write(pgd_pte(pgd))
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static inline void pgd_set ( pgd_t * pgdp , unsigned long val )
{
* pgdp = __pgd ( val ) ;
}
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/*
* Find an entry in a page - table - directory . We combine the address region
* ( the high order N bits ) and the pgd portion of the address .
*/
# define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
# define pmd_offset(pudp,addr) \
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( ( ( pmd_t * ) pud_page_vaddr ( * ( pudp ) ) ) + pmd_index ( addr ) )
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# define pte_offset_kernel(dir,addr) \
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( ( ( pte_t * ) pmd_page_vaddr ( * ( dir ) ) ) + pte_index ( addr ) )
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# define pte_offset_map(dir,addr) pte_offset_kernel((dir), (addr))
# define pte_unmap(pte) do { } while(0)
/* to find an entry in a kernel page-table-directory */
/* This now only contains the vmalloc pages */
# define pgd_offset_k(address) pgd_offset(&init_mm, address)
# define pte_ERROR(e) \
pr_err ( " %s:%d: bad pte %08lx. \n " , __FILE__ , __LINE__ , pte_val ( e ) )
# define pmd_ERROR(e) \
pr_err ( " %s:%d: bad pmd %08lx. \n " , __FILE__ , __LINE__ , pmd_val ( e ) )
# define pgd_ERROR(e) \
pr_err ( " %s:%d: bad pgd %08lx. \n " , __FILE__ , __LINE__ , pgd_val ( e ) )
/* Encode and de-code a swap entry */
# define MAX_SWAPFILES_CHECK() do { \
BUILD_BUG_ON ( MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS ) ; \
/* \
* Don ' t have overlapping bits with _PAGE_HPTEFLAGS \
* We filter HPTEFLAGS on set_pte . \
*/ \
BUILD_BUG_ON ( _PAGE_HPTEFLAGS & ( 0x1f < < _PAGE_BIT_SWAP_TYPE ) ) ; \
} while ( 0 )
/*
* on pte we don ' t need handle RADIX_TREE_EXCEPTIONAL_SHIFT ;
*/
# define SWP_TYPE_BITS 5
# define __swp_type(x) (((x).val >> _PAGE_BIT_SWAP_TYPE) \
& ( ( 1UL < < SWP_TYPE_BITS ) - 1 ) )
# define __swp_offset(x) ((x).val >> PTE_RPN_SHIFT)
# define __swp_entry(type, offset) ((swp_entry_t) { \
( ( type ) < < _PAGE_BIT_SWAP_TYPE ) \
| ( ( offset ) < < PTE_RPN_SHIFT ) } )
# define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val((pte)) })
# define __swp_entry_to_pte(x) __pte((x).val)
void pgtable_cache_add ( unsigned shift , void ( * ctor ) ( void * ) ) ;
void pgtable_cache_init ( void ) ;
struct page * realmode_pfn_to_page ( unsigned long pfn ) ;
# ifdef CONFIG_TRANSPARENT_HUGEPAGE
extern pmd_t pfn_pmd ( unsigned long pfn , pgprot_t pgprot ) ;
extern pmd_t mk_pmd ( struct page * page , pgprot_t pgprot ) ;
extern pmd_t pmd_modify ( pmd_t pmd , pgprot_t newprot ) ;
extern void set_pmd_at ( struct mm_struct * mm , unsigned long addr ,
pmd_t * pmdp , pmd_t pmd ) ;
extern void update_mmu_cache_pmd ( struct vm_area_struct * vma , unsigned long addr ,
pmd_t * pmd ) ;
extern int has_transparent_hugepage ( void ) ;
# endif /* CONFIG_TRANSPARENT_HUGEPAGE */
static inline pte_t pmd_pte ( pmd_t pmd )
{
return __pte ( pmd_val ( pmd ) ) ;
}
static inline pmd_t pte_pmd ( pte_t pte )
{
return __pmd ( pte_val ( pte ) ) ;
}
static inline pte_t * pmdp_ptep ( pmd_t * pmd )
{
return ( pte_t * ) pmd ;
}
# define pmd_pfn(pmd) pte_pfn(pmd_pte(pmd))
# define pmd_dirty(pmd) pte_dirty(pmd_pte(pmd))
# define pmd_young(pmd) pte_young(pmd_pte(pmd))
# define pmd_mkold(pmd) pte_pmd(pte_mkold(pmd_pte(pmd)))
# define pmd_wrprotect(pmd) pte_pmd(pte_wrprotect(pmd_pte(pmd)))
# define pmd_mkdirty(pmd) pte_pmd(pte_mkdirty(pmd_pte(pmd)))
# define pmd_mkyoung(pmd) pte_pmd(pte_mkyoung(pmd_pte(pmd)))
# define pmd_mkwrite(pmd) pte_pmd(pte_mkwrite(pmd_pte(pmd)))
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# ifdef CONFIG_NUMA_BALANCING
static inline int pmd_protnone ( pmd_t pmd )
{
return pte_protnone ( pmd_pte ( pmd ) ) ;
}
# endif /* CONFIG_NUMA_BALANCING */
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# define __HAVE_ARCH_PMD_WRITE
# define pmd_write(pmd) pte_write(pmd_pte(pmd))
static inline pmd_t pmd_mkhuge ( pmd_t pmd )
{
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return __pmd ( pmd_val ( pmd ) | ( _PAGE_PTE | _PAGE_THP_HUGE ) ) ;
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}
# define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
extern int pmdp_set_access_flags ( struct vm_area_struct * vma ,
unsigned long address , pmd_t * pmdp ,
pmd_t entry , int dirty ) ;
# define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
extern int pmdp_test_and_clear_young ( struct vm_area_struct * vma ,
unsigned long address , pmd_t * pmdp ) ;
# define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
extern int pmdp_clear_flush_young ( struct vm_area_struct * vma ,
unsigned long address , pmd_t * pmdp ) ;
# define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
extern pmd_t pmdp_huge_get_and_clear ( struct mm_struct * mm ,
unsigned long addr , pmd_t * pmdp ) ;
# define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
extern void pmdp_splitting_flush ( struct vm_area_struct * vma ,
unsigned long address , pmd_t * pmdp ) ;
extern pmd_t pmdp_collapse_flush ( struct vm_area_struct * vma ,
unsigned long address , pmd_t * pmdp ) ;
# define pmdp_collapse_flush pmdp_collapse_flush
# define __HAVE_ARCH_PGTABLE_DEPOSIT
extern void pgtable_trans_huge_deposit ( struct mm_struct * mm , pmd_t * pmdp ,
pgtable_t pgtable ) ;
# define __HAVE_ARCH_PGTABLE_WITHDRAW
extern pgtable_t pgtable_trans_huge_withdraw ( struct mm_struct * mm , pmd_t * pmdp ) ;
# define __HAVE_ARCH_PMDP_INVALIDATE
extern void pmdp_invalidate ( struct vm_area_struct * vma , unsigned long address ,
pmd_t * pmdp ) ;
# define pmd_move_must_withdraw pmd_move_must_withdraw
struct spinlock ;
static inline int pmd_move_must_withdraw ( struct spinlock * new_pmd_ptl ,
struct spinlock * old_pmd_ptl )
{
/*
* Archs like ppc64 use pgtable to store per pmd
* specific information . So when we switch the pmd ,
* we should also withdraw and deposit the pgtable
*/
return true ;
}
# endif /* __ASSEMBLY__ */
# endif /* _ASM_POWERPC_BOOK3S_64_PGTABLE_H_ */