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android_kernel_samsung_msm8976/include/asm-ia64/page.h
David Gibson 42b88befd6 [PATCH] hugepage: is_aligned_hugepage_range() cleanup 
Quite a long time back, prepare_hugepage_range() replaced
is_aligned_hugepage_range() as the callback from mm/mmap.c to arch code to
verify if an address range is suitable for a hugepage mapping.
is_aligned_hugepage_range() stuck around, but only to implement
prepare_hugepage_range() on archs which didn't implement their own.

Most archs (everything except ia64 and powerpc) used the same
implementation of is_aligned_hugepage_range().  On powerpc, which
implements its own prepare_hugepage_range(), the custom version was never
used.

In addition, "is_aligned_hugepage_range()" was a bad name, because it
suggests it returns true iff the given range is a good hugepage range,
whereas in fact it returns 0-or-error (so the sense is reversed).

This patch cleans up by abolishing is_aligned_hugepage_range().  Instead
prepare_hugepage_range() is defined directly.  Most archs use the default
version, which simply checks the given region is aligned to the size of a
hugepage.  ia64 and powerpc define custom versions.  The ia64 one simply
checks that the range is in the correct address space region in addition to
being suitably aligned.  The powerpc version (just as previously) checks
for suitable addresses, and if necessary performs low-level MMU frobbing to
set up new areas for use by hugepages.

No libhugetlbfs testsuite regressions on ppc64 (POWER5 LPAR).

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Zhang Yanmin <yanmin.zhang@intel.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: William Lee Irwin III <wli@holomorphy.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-22 07:54:04 -08:00

224 lines
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#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 <linux/config.h>
#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 PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
#define PERCPU_PAGE_SHIFT 16 /* 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
# define ARCH_HAS_HUGEPAGE_ONLY_RANGE
# define ARCH_HAS_PREPARE_HUGEPAGE_RANGE
# define ARCH_HAS_HUGETLB_FREE_PGD_RANGE
#endif /* CONFIG_HUGETLB_PAGE */
#ifdef __ASSEMBLY__
# define __pa(x) ((x) - PAGE_OFFSET)
# define __va(x) ((x) + PAGE_OFFSET)
#else /* !__ASSEMBLY */
# ifdef __KERNEL__
# 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(vma, vaddr) \
({ \
struct page *page = alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO, 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);
#elif defined(CONFIG_FLATMEM)
# define ia64_pfn_valid(pfn) 1
#endif
#ifdef CONFIG_FLATMEM
# define pfn_valid(pfn) (((pfn) < max_mapnr) && ia64_pfn_valid(pfn))
# define page_to_pfn(page) ((unsigned long) (page - mem_map))
# define pfn_to_page(pfn) (mem_map + (pfn))
#elif defined(CONFIG_DISCONTIGMEM)
extern struct page *vmem_map;
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))
# define page_to_pfn(page) ((unsigned long) (page - vmem_map))
# define pfn_to_page(pfn) (vmem_map + (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)
# define is_hugepage_only_range(mm, addr, len) \
(REGION_NUMBER(addr) == RGN_HPAGE && \
REGION_NUMBER((addr)+(len)-1) == RGN_HPAGE)
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 /* __KERNEL__ */
#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;
#ifdef CONFIG_PGTABLE_4
typedef struct { unsigned long pud; } pud_t;
#endif
typedef struct { unsigned long pgd; } pgd_t;
typedef struct { unsigned long pgprot; } pgprot_t;
# define pte_val(x) ((x).pte)
# define pmd_val(x) ((x).pmd)
#ifdef CONFIG_PGTABLE_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 __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;
# 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))
#endif /* _ASM_IA64_PAGE_H */
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