- 根目录:
- arch
- microblaze
- include
- asm
- page.h
/*
* VM ops
*
* Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
* Copyright (C) 2008-2009 PetaLogix
* Copyright (C) 2006 Atmark Techno, Inc.
* Changes for MMU support:
* Copyright (C) 2007 Xilinx, Inc. All rights reserved.
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#ifndef _ASM_MICROBLAZE_PAGE_H
#define _ASM_MICROBLAZE_PAGE_H
#include <linux/pfn.h>
#include <asm/setup.h>
#include <asm/asm-compat.h>
#include <linux/const.h>
#ifdef __KERNEL__
/* PAGE_SHIFT determines the page size */
#if defined(CONFIG_MICROBLAZE_64K_PAGES)
#define PAGE_SHIFT 16
#elif defined(CONFIG_MICROBLAZE_16K_PAGES)
#define PAGE_SHIFT 14
#else
#define PAGE_SHIFT 12
#endif
#define PAGE_SIZE (ASM_CONST(1) << PAGE_SHIFT)
#define PAGE_MASK (~(PAGE_SIZE-1))
#define LOAD_OFFSET ASM_CONST((CONFIG_KERNEL_START-CONFIG_KERNEL_BASE_ADDR))
#define PTE_SHIFT (PAGE_SHIFT - 2) /* 1024 ptes per page */
#ifndef __ASSEMBLY__
/* MS be sure that SLAB allocates aligned objects */
#define ARCH_DMA_MINALIGN L1_CACHE_BYTES
#define ARCH_SLAB_MINALIGN L1_CACHE_BYTES
#define PAGE_UP(addr) (((addr)+((PAGE_SIZE)-1))&(~((PAGE_SIZE)-1)))
#define PAGE_DOWN(addr) ((addr)&(~((PAGE_SIZE)-1)))
#ifndef CONFIG_MMU
/*
* PAGE_OFFSET -- the first address of the first page of memory. When not
* using MMU this corresponds to the first free page in physical memory (aligned
* on a page boundary).
*/
extern unsigned int __page_offset;
#define PAGE_OFFSET __page_offset
#else /* CONFIG_MMU */
/*
* PAGE_OFFSET -- the first address of the first page of memory. With MMU
* it is set to the kernel start address (aligned on a page boundary).
*
* CONFIG_KERNEL_START is defined in arch/microblaze/config.in and used
* in arch/microblaze/Makefile.
*/
#define PAGE_OFFSET CONFIG_KERNEL_START
/*
* The basic type of a PTE - 32 bit physical addressing.
*/
typedef unsigned long pte_basic_t;
#define PTE_FMT "%.8lx"
#endif /* CONFIG_MMU */
# define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)
# define clear_page(pgaddr) memset((pgaddr), 0, PAGE_SIZE)
# define clear_user_page(pgaddr, vaddr, page) memset((pgaddr), 0, PAGE_SIZE)
# define copy_user_page(vto, vfrom, vaddr, topg) \
memcpy((vto), (vfrom), PAGE_SIZE)
/*
* These are used to make use of C type-checking..
*/
typedef struct page *pgtable_t;
typedef struct { unsigned long pte; } pte_t;
typedef struct { unsigned long pgprot; } pgprot_t;
/* FIXME this can depend on linux kernel version */
# ifdef CONFIG_MMU
typedef struct { unsigned long pmd; } pmd_t;
typedef struct { unsigned long pgd; } pgd_t;
# else /* CONFIG_MMU */
typedef struct { unsigned long ste[64]; } pmd_t;
typedef struct { pmd_t pue[1]; } pud_t;
typedef struct { pud_t pge[1]; } pgd_t;
# endif /* CONFIG_MMU */
# define pte_val(x) ((x).pte)
# define pgprot_val(x) ((x).pgprot)
# ifdef CONFIG_MMU
# define pmd_val(x) ((x).pmd)
# define pgd_val(x) ((x).pgd)
# else /* CONFIG_MMU */
# define pmd_val(x) ((x).ste[0])
# define pud_val(x) ((x).pue[0])
# define pgd_val(x) ((x).pge[0])
# endif /* CONFIG_MMU */
# define __pte(x) ((pte_t) { (x) })
# define __pmd(x) ((pmd_t) { (x) })
# define __pgd(x) ((pgd_t) { (x) })
# define __pgprot(x) ((pgprot_t) { (x) })
/**
* Conversions for virtual address, physical address, pfn, and struct
* page are defined in the following files.
*
* virt -+
* | asm-microblaze/page.h
* phys -+
* | linux/pfn.h
* pfn -+
* | asm-generic/memory_model.h
* page -+
*
*/
extern unsigned long max_low_pfn;
extern unsigned long min_low_pfn;
extern unsigned long max_pfn;
extern unsigned long memory_start;
extern unsigned long memory_size;
extern unsigned long lowmem_size;
extern unsigned long kernel_tlb;
extern int page_is_ram(unsigned long pfn);
# define phys_to_pfn(phys) (PFN_DOWN(phys))
# define pfn_to_phys(pfn) (PFN_PHYS(pfn))
# define virt_to_pfn(vaddr) (phys_to_pfn((__pa(vaddr))))
# define pfn_to_virt(pfn) __va(pfn_to_phys((pfn)))
# ifdef CONFIG_MMU
# 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 page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
# else /* CONFIG_MMU */
# define virt_to_page(vaddr) (pfn_to_page(virt_to_pfn(vaddr)))
# define page_to_virt(page) (pfn_to_virt(page_to_pfn(page)))
# define page_to_phys(page) (pfn_to_phys(page_to_pfn(page)))
# define page_to_bus(page) (page_to_phys(page))
# define phys_to_page(paddr) (pfn_to_page(phys_to_pfn(paddr)))
# endif /* CONFIG_MMU */
# ifndef CONFIG_MMU
# define pfn_valid(pfn) (((pfn) >= min_low_pfn) && \
((pfn) <= (min_low_pfn + max_mapnr)))
# define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT)
# else /* CONFIG_MMU */
# define ARCH_PFN_OFFSET (memory_start >> PAGE_SHIFT)
# define pfn_valid(pfn) ((pfn) < (max_mapnr + ARCH_PFN_OFFSET))
# endif /* CONFIG_MMU */
# endif /* __ASSEMBLY__ */
#define virt_addr_valid(vaddr) (pfn_valid(virt_to_pfn(vaddr)))
# define __pa(x) __virt_to_phys((unsigned long)(x))
# define __va(x) ((void *)__phys_to_virt((unsigned long)(x)))
/* Convert between virtual and physical address for MMU. */
/* Handle MicroBlaze processor with virtual memory. */
#ifndef CONFIG_MMU
#define __virt_to_phys(addr) addr
#define __phys_to_virt(addr) addr
#define tophys(rd, rs) addik rd, rs, 0
#define tovirt(rd, rs) addik rd, rs, 0
#else
#define __virt_to_phys(addr) \
((addr) + CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
#define __phys_to_virt(addr) \
((addr) + CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
#define tophys(rd, rs) \
addik rd, rs, (CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
#define tovirt(rd, rs) \
addik rd, rs, (CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
#endif /* CONFIG_MMU */
#define TOPHYS(addr) __virt_to_phys(addr)
#ifdef CONFIG_MMU
#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
#endif /* CONFIG_MMU */
#endif /* __KERNEL__ */
#include <asm-generic/memory_model.h>
#include <asm-generic/getorder.h>
#endif /* _ASM_MICROBLAZE_PAGE_H */