#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 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_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)) #endif #endif #if defined(CONFIG_FLATMEM) || defined(CONFIG_SPARSEMEM) /* FLATMEM always configures mem_map (mem_map = vmem_map if necessary) */ #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) # 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 */