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