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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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129 lines
3.6 KiB
C
129 lines
3.6 KiB
C
/* MN10300 Page table definitions
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*
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#ifndef _ASM_PAGE_H
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#define _ASM_PAGE_H
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/* PAGE_SHIFT determines the page size */
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#define PAGE_SHIFT 12
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#ifndef __ASSEMBLY__
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#define PAGE_SIZE (1UL << PAGE_SHIFT)
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#define PAGE_MASK (~(PAGE_SIZE - 1))
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#else
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#define PAGE_SIZE +(1 << PAGE_SHIFT) /* unary plus marks an
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* immediate val not an addr */
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#define PAGE_MASK +(~(PAGE_SIZE - 1))
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#endif
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#ifdef __KERNEL__
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#ifndef __ASSEMBLY__
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#define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
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#define copy_page(to, from) memcpy((void *)(to), (void *)(from), PAGE_SIZE)
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#define clear_user_page(addr, vaddr, page) clear_page(addr)
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#define copy_user_page(vto, vfrom, vaddr, to) copy_page(vto, vfrom)
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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 pgd; } pgd_t;
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typedef struct { unsigned long pgprot; } pgprot_t;
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typedef struct page *pgtable_t;
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#define PTE_MASK PAGE_MASK
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#define HPAGE_SHIFT 22
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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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#endif
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#define pte_val(x) ((x).pte)
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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 __pgd(x) ((pgd_t) { (x) })
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#define __pgprot(x) ((pgprot_t) { (x) })
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#include <asm-generic/pgtable-nopmd.h>
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#endif /* !__ASSEMBLY__ */
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/*
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* This handles the memory map.. We could make this a config
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* option, but too many people screw it up, and too few need
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* it.
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*
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* A __PAGE_OFFSET of 0xC0000000 means that the kernel has
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* a virtual address space of one gigabyte, which limits the
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* amount of physical memory you can use to about 950MB.
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*/
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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) __attribute__((const));
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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 /* __ASSEMBLY__ */
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#include <asm/page_offset.h>
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#define __PAGE_OFFSET (PAGE_OFFSET_RAW)
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#define PAGE_OFFSET ((unsigned long) __PAGE_OFFSET)
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/*
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* main RAM and kernel working space are coincident at 0x90000000, but to make
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* life more interesting, there's also an uncached virtual shadow at 0xb0000000
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* - these mappings are fixed in the MMU
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*/
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#define __pfn_disp (CONFIG_KERNEL_RAM_BASE_ADDRESS >> PAGE_SHIFT)
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#define __pa(x) ((unsigned long)(x))
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#define __va(x) ((void *)(unsigned long)(x))
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#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
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#define pfn_to_page(pfn) (mem_map + ((pfn) - __pfn_disp))
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#define page_to_pfn(page) ((unsigned long)((page) - mem_map) + __pfn_disp)
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#define pfn_valid(pfn) \
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({ \
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unsigned long __pfn = (pfn) - __pfn_disp; \
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__pfn < max_mapnr; \
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})
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#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
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#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
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#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
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#define VM_DATA_DEFAULT_FLAGS \
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(VM_READ | VM_WRITE | \
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((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \
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VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
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#endif /* __KERNEL__ */
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#endif /* _ASM_PAGE_H */
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