| #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_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 */ |