/* * linux/include/asm-arm/page.h * * Copyright (C) 1995-2003 Russell King * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #ifndef _ASMARM_PAGE_H #define _ASMARM_PAGE_H #include <linux/config.h> /* PAGE_SHIFT determines the page size */ #define PAGE_SHIFT 12 #define PAGE_SIZE (1UL << PAGE_SHIFT) #define PAGE_MASK (~(PAGE_SIZE-1)) #ifdef __KERNEL__ /* to align the pointer to the (next) page boundary */ #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK) #ifndef __ASSEMBLY__ #include <asm/glue.h> /* * User Space Model * ================ * * This section selects the correct set of functions for dealing with * page-based copying and clearing for user space for the particular * processor(s) we're building for. * * We have the following to choose from: * v3 - ARMv3 * v4wt - ARMv4 with writethrough cache, without minicache * v4wb - ARMv4 with writeback cache, without minicache * v4_mc - ARMv4 with minicache * xscale - Xscale */ #undef _USER #undef MULTI_USER #ifdef CONFIG_CPU_COPY_V3 # ifdef _USER # define MULTI_USER 1 # else # define _USER v3 # endif #endif #ifdef CONFIG_CPU_COPY_V4WT # ifdef _USER # define MULTI_USER 1 # else # define _USER v4wt # endif #endif #ifdef CONFIG_CPU_COPY_V4WB # ifdef _USER # define MULTI_USER 1 # else # define _USER v4wb # endif #endif #ifdef CONFIG_CPU_SA1100 # ifdef _USER # define MULTI_USER 1 # else # define _USER v4_mc # endif #endif #ifdef CONFIG_CPU_XSCALE # ifdef _USER # define MULTI_USER 1 # else # define _USER xscale_mc # endif #endif #ifdef CONFIG_CPU_COPY_V6 # define MULTI_USER 1 #endif #if !defined(_USER) && !defined(MULTI_USER) #error Unknown user operations model #endif struct cpu_user_fns { void (*cpu_clear_user_page)(void *p, unsigned long user); void (*cpu_copy_user_page)(void *to, const void *from, unsigned long user); }; #ifdef MULTI_USER extern struct cpu_user_fns cpu_user; #define __cpu_clear_user_page cpu_user.cpu_clear_user_page #define __cpu_copy_user_page cpu_user.cpu_copy_user_page #else #define __cpu_clear_user_page __glue(_USER,_clear_user_page) #define __cpu_copy_user_page __glue(_USER,_copy_user_page) extern void __cpu_clear_user_page(void *p, unsigned long user); extern void __cpu_copy_user_page(void *to, const void *from, unsigned long user); #endif #define clear_user_page(addr,vaddr,pg) __cpu_clear_user_page(addr, vaddr) #define copy_user_page(to,from,vaddr,pg) __cpu_copy_user_page(to, from, vaddr) #define clear_page(page) memzero((void *)(page), PAGE_SIZE) extern void copy_page(void *to, const void *from); #undef STRICT_MM_TYPECHECKS #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; typedef struct { unsigned long pgd[2]; } pgd_t; typedef struct { unsigned long pgprot; } pgprot_t; #define pte_val(x) ((x).pte) #define pmd_val(x) ((x).pmd) #define pgd_val(x) ((x).pgd[0]) #define pgprot_val(x) ((x).pgprot) #define __pte(x) ((pte_t) { (x) } ) #define __pmd(x) ((pmd_t) { (x) } ) #define __pgprot(x) ((pgprot_t) { (x) } ) #else /* * .. while these make it easier on the compiler */ typedef unsigned long pte_t; typedef unsigned long pmd_t; typedef unsigned long pgd_t[2]; typedef unsigned long pgprot_t; #define pte_val(x) (x) #define pmd_val(x) (x) #define pgd_val(x) ((x)[0]) #define pgprot_val(x) (x) #define __pte(x) (x) #define __pmd(x) (x) #define __pgprot(x) (x) #endif /* STRICT_MM_TYPECHECKS */ /* the upper-most page table pointer */ extern pmd_t *top_pmd; /* Pure 2^n version of get_order */ 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; } #include <asm/memory.h> #endif /* !__ASSEMBLY__ */ #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) #endif /* __KERNEL__ */ #endif