63551ae0fe
A lot of the code in arch/*/mm/hugetlbpage.c is quite similar. This patch attempts to consolidate a lot of the code across the arch's, putting the combined version in mm/hugetlb.c. There are a couple of uglyish hacks in order to covert all the hugepage archs, but the result is a very large reduction in the total amount of code. It also means things like hugepage lazy allocation could be implemented in one place, instead of six. Tested, at least a little, on ppc64, i386 and x86_64. Notes: - this patch changes the meaning of set_huge_pte() to be more analagous to set_pte() - does SH4 need s special huge_ptep_get_and_clear()?? Acked-by: William Lee Irwin <wli@holomorphy.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
146 lines
4.2 KiB
C
146 lines
4.2 KiB
C
#ifndef __ASM_SH_PAGE_H
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#define __ASM_SH_PAGE_H
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/*
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* Copyright (C) 1999 Niibe Yutaka
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*/
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/*
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[ P0/U0 (virtual) ] 0x00000000 <------ User space
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[ P1 (fixed) cached ] 0x80000000 <------ Kernel space
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[ P2 (fixed) non-cachable] 0xA0000000 <------ Physical access
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[ P3 (virtual) cached] 0xC0000000 <------ vmalloced area
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[ P4 control ] 0xE0000000
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*/
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#include <linux/config.h>
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/* PAGE_SHIFT determines the page size */
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#define PAGE_SHIFT 12
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#define PAGE_SIZE (1UL << PAGE_SHIFT)
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#define PAGE_MASK (~(PAGE_SIZE-1))
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#define PTE_MASK PAGE_MASK
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#if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
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#define HPAGE_SHIFT 16
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#elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
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#define HPAGE_SHIFT 20
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#endif
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#ifdef CONFIG_HUGETLB_PAGE
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#define HPAGE_SIZE (1UL << HPAGE_SHIFT)
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#define HPAGE_MASK (~(HPAGE_SIZE-1))
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#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT-PAGE_SHIFT)
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#define ARCH_HAS_SETCLEAR_HUGE_PTE
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#endif
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#ifdef __KERNEL__
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#ifndef __ASSEMBLY__
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extern void (*clear_page)(void *to);
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extern void (*copy_page)(void *to, void *from);
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extern void clear_page_slow(void *to);
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extern void copy_page_slow(void *to, void *from);
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#if defined(CONFIG_SH7705_CACHE_32KB) && defined(CONFIG_MMU)
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struct page;
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extern void clear_user_page(void *to, unsigned long address, struct page *pg);
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extern void copy_user_page(void *to, void *from, unsigned long address, struct page *pg);
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extern void __clear_user_page(void *to, void *orig_to);
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extern void __copy_user_page(void *to, void *from, void *orig_to);
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#elif defined(CONFIG_CPU_SH2) || defined(CONFIG_CPU_SH3) || !defined(CONFIG_MMU)
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#define clear_user_page(page, vaddr, pg) clear_page(page)
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#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
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#elif defined(CONFIG_CPU_SH4)
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struct page;
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extern void clear_user_page(void *to, unsigned long address, struct page *pg);
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extern void copy_user_page(void *to, void *from, unsigned long address, struct page *pg);
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extern void __clear_user_page(void *to, void *orig_to);
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extern void __copy_user_page(void *to, void *from, void *orig_to);
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#endif
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/*
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* These are used to make use of C type-checking..
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*/
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typedef struct { unsigned long pte; } pte_t;
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typedef struct { unsigned long pmd; } pmd_t;
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typedef struct { unsigned long pgd; } pgd_t;
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typedef struct { unsigned long pgprot; } pgprot_t;
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#define pte_val(x) ((x).pte)
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#define pmd_val(x) ((x).pmd)
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#define pgd_val(x) ((x).pgd)
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#define pgprot_val(x) ((x).pgprot)
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#define __pte(x) ((pte_t) { (x) } )
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#define __pmd(x) ((pmd_t) { (x) } )
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#define __pgd(x) ((pgd_t) { (x) } )
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#define __pgprot(x) ((pgprot_t) { (x) } )
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#endif /* !__ASSEMBLY__ */
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/* to align the pointer to the (next) page boundary */
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#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
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/*
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* IF YOU CHANGE THIS, PLEASE ALSO CHANGE
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*
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* arch/sh/kernel/vmlinux.lds.S
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*
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* which has the same constant encoded..
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*/
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#define __MEMORY_START CONFIG_MEMORY_START
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#define __MEMORY_SIZE CONFIG_MEMORY_SIZE
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#ifdef CONFIG_DISCONTIGMEM
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/* Just for HP690, for now.. */
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#define __MEMORY_START_2ND (__MEMORY_START+0x02000000)
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#define __MEMORY_SIZE_2ND 0x001000000 /* 16MB */
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#endif
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#define PAGE_OFFSET (0x80000000UL)
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#define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
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#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
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#define MAP_NR(addr) (((unsigned long)(addr)-PAGE_OFFSET) >> PAGE_SHIFT)
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#ifndef CONFIG_DISCONTIGMEM
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#define phys_to_page(phys) (mem_map + (((phys)-__MEMORY_START) >> PAGE_SHIFT))
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#define page_to_phys(page) (((page - mem_map) << PAGE_SHIFT) + __MEMORY_START)
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#endif
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/* PFN start number, because of __MEMORY_START */
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#define PFN_START (__MEMORY_START >> PAGE_SHIFT)
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#define pfn_to_page(pfn) (mem_map + (pfn) - PFN_START)
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#define page_to_pfn(page) ((unsigned long)((page) - mem_map) + PFN_START)
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#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
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#define pfn_valid(pfn) (((pfn) - PFN_START) < max_mapnr)
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#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
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#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
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VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
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#ifndef __ASSEMBLY__
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/* Pure 2^n version of get_order */
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static __inline__ int get_order(unsigned long size)
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{
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int order;
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size = (size-1) >> (PAGE_SHIFT-1);
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order = -1;
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do {
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size >>= 1;
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order++;
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} while (size);
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return order;
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}
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#endif
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#endif /* __KERNEL__ */
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#endif /* __ASM_SH_PAGE_H */
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