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Diffstat (limited to 'include/asm-ia64/page.h')
| -rw-r--r-- | include/asm-ia64/page.h | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/include/asm-ia64/page.h b/include/asm-ia64/page.h new file mode 100644 index 000000000000..24aab801a8ca --- /dev/null +++ b/include/asm-ia64/page.h @@ -0,0 +1,207 @@ +#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> + +/* + * 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) + +#define RGN_MAP_LIMIT ((1UL << (4*PAGE_SHIFT - 12)) - PAGE_SIZE) /* per region addr limit */ + +#ifdef CONFIG_HUGETLB_PAGE +# define REGION_HPAGE (4UL) /* note: this is hardcoded in reload_context()!*/ +# define REGION_SHIFT 61 +# define HPAGE_REGION_BASE (REGION_HPAGE << REGION_SHIFT) +# 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 +#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); +#else +# define ia64_pfn_valid(pfn) 1 +#endif + +#ifndef CONFIG_DISCONTIGMEM +# 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)) +#else +extern struct page *vmem_map; +extern unsigned long max_low_pfn; +# define pfn_valid(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) + +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;}) + +#define REGION_SIZE REGION_NUMBER(1) +#define REGION_KERNEL 7 + +#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) == REGION_HPAGE && \ + REGION_NUMBER((addr)+(len)) == REGION_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; + 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) +# 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 __IA64_UL_CONST(0xe000000000000000) + +#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 */ |