/* * linux/include/asm-xtensa/page.h * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version2 as * published by the Free Software Foundation. * * Copyright (C) 2001 - 2005 Tensilica Inc. */ #ifndef _XTENSA_PAGE_H #define _XTENSA_PAGE_H #ifdef __KERNEL__ #include <asm/processor.h> #include <linux/config.h> /* * PAGE_SHIFT determines the page size * PAGE_ALIGN(x) aligns the pointer to the (next) page boundary */ #define PAGE_SHIFT XCHAL_MMU_MIN_PTE_PAGE_SIZE #define PAGE_SIZE (1 << PAGE_SHIFT) #define PAGE_MASK (~(PAGE_SIZE-1)) #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE - 1) & PAGE_MASK) #define DCACHE_WAY_SIZE (XCHAL_DCACHE_SIZE / XCHAL_DCACHE_WAYS) #define PAGE_OFFSET XCHAL_KSEG_CACHED_VADDR #ifdef __ASSEMBLY__ #define __pgprot(x) (x) #else /* * These are used to make use of C type-checking.. */ typedef struct { unsigned long pte; } pte_t; /* page table entry */ typedef struct { unsigned long pgd; } pgd_t; /* PGD table entry */ typedef struct { unsigned long pgprot; } pgprot_t; #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) } ) /* * Pure 2^n version of get_order */ static inline int get_order(unsigned long size) { int order; #ifndef XCHAL_HAVE_NSU unsigned long x1, x2, x4, x8, x16; size = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; x1 = size & 0xAAAAAAAA; x2 = size & 0xCCCCCCCC; x4 = size & 0xF0F0F0F0; x8 = size & 0xFF00FF00; x16 = size & 0xFFFF0000; order = x2 ? 2 : 0; order += (x16 != 0) * 16; order += (x8 != 0) * 8; order += (x4 != 0) * 4; order += (x1 != 0); return order; #else size = (size - 1) >> PAGE_SHIFT; asm ("nsau %0, %1" : "=r" (order) : "r" (size)); return 32 - order; #endif } struct page; extern void clear_page(void *page); extern void copy_page(void *to, void *from); /* * If we have cache aliasing and writeback caches, we might have to do * some extra work */ #if (DCACHE_WAY_SIZE > PAGE_SIZE) void clear_user_page(void *addr, unsigned long vaddr, struct page* page); void copy_user_page(void *to,void* from,unsigned long vaddr,struct page* page); #else # define clear_user_page(page,vaddr,pg) clear_page(page) # define copy_user_page(to, from, vaddr, pg) copy_page(to, from) #endif /* * This handles the memory map. We handle pages at * XCHAL_KSEG_CACHED_VADDR for kernels with 32 bit address space. * These macros are for conversion of kernel address, not user * addresses. */ #define __pa(x) ((unsigned long) (x) - PAGE_OFFSET) #define __va(x) ((void *)((unsigned long) (x) + PAGE_OFFSET)) #define pfn_valid(pfn) ((unsigned long)pfn < max_mapnr) #ifndef CONFIG_DISCONTIGMEM # define pfn_to_page(pfn) (mem_map + (pfn)) # define page_to_pfn(page) ((unsigned long)((page) - mem_map)) #else # error CONFIG_DISCONTIGMEM not supported #endif #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) #define page_to_virt(page) __va(page_to_pfn(page) << 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 WANT_PAGE_VIRTUAL #endif /* __ASSEMBLY__ */ #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) #endif /* __KERNEL__ */ #endif /* _XTENSA_PAGE_H */