de925d9d3b
Based on PowerPC patche 52142e756e
PowerPC description:
On platforms doing non-coherent DMA (4xx, 8xx, ...), it's important
that the kmalloc minimum alignment is set to the cache line size, to
avoid sharing cache lines between different objects, so that DMA to
one of the objects doesn't corrupt the other.
Signed-off-by: Michal Simek <monstr@monstr.eu>
219 lines
6.5 KiB
C
219 lines
6.5 KiB
C
/*
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* VM ops
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*
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* Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
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* Copyright (C) 2008-2009 PetaLogix
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* Copyright (C) 2006 Atmark Techno, Inc.
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* Changes for MMU support:
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* Copyright (C) 2007 Xilinx, Inc. All rights reserved.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#ifndef _ASM_MICROBLAZE_PAGE_H
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#define _ASM_MICROBLAZE_PAGE_H
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#include <linux/pfn.h>
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#include <asm/setup.h>
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#include <asm/asm-compat.h>
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#include <linux/const.h>
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#ifdef __KERNEL__
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/* PAGE_SHIFT determines the page size */
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#define PAGE_SHIFT (12)
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#define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
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#define PAGE_MASK (~(PAGE_SIZE-1))
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#define LOAD_OFFSET ASM_CONST((CONFIG_KERNEL_START-CONFIG_KERNEL_BASE_ADDR))
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#ifndef __ASSEMBLY__
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/* MS be sure that SLAB allocates aligned objects */
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#define ARCH_KMALLOC_MINALIGN L1_CACHE_BYTES
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#define PAGE_UP(addr) (((addr)+((PAGE_SIZE)-1))&(~((PAGE_SIZE)-1)))
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#define PAGE_DOWN(addr) ((addr)&(~((PAGE_SIZE)-1)))
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/* align addr on a size boundary - adjust address up/down if needed */
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#define _ALIGN_UP(addr, size) (((addr)+((size)-1))&(~((size)-1)))
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#define _ALIGN_DOWN(addr, size) ((addr)&(~((size)-1)))
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/* align addr on a size boundary - adjust address up if needed */
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#define _ALIGN(addr, size) _ALIGN_UP(addr, size)
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#ifndef CONFIG_MMU
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/*
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* PAGE_OFFSET -- the first address of the first page of memory. When not
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* using MMU this corresponds to the first free page in physical memory (aligned
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* on a page boundary).
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*/
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extern unsigned int __page_offset;
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#define PAGE_OFFSET __page_offset
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#else /* CONFIG_MMU */
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/*
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* PAGE_OFFSET -- the first address of the first page of memory. With MMU
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* it is set to the kernel start address (aligned on a page boundary).
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*
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* CONFIG_KERNEL_START is defined in arch/microblaze/config.in and used
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* in arch/microblaze/Makefile.
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*/
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#define PAGE_OFFSET CONFIG_KERNEL_START
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/*
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* The basic type of a PTE - 32 bit physical addressing.
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*/
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typedef unsigned long pte_basic_t;
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#define PTE_SHIFT (PAGE_SHIFT - 2) /* 1024 ptes per page */
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#define PTE_FMT "%.8lx"
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#endif /* CONFIG_MMU */
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# define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)
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# define clear_page(pgaddr) memset((pgaddr), 0, PAGE_SIZE)
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# define clear_user_page(pgaddr, vaddr, page) memset((pgaddr), 0, PAGE_SIZE)
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# define copy_user_page(vto, vfrom, vaddr, topg) \
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memcpy((vto), (vfrom), PAGE_SIZE)
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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 page *pgtable_t;
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typedef struct { unsigned long pte; } pte_t;
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typedef struct { unsigned long pgprot; } pgprot_t;
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/* FIXME this can depend on linux kernel version */
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# ifdef CONFIG_MMU
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typedef struct { unsigned long pmd; } pmd_t;
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typedef struct { unsigned long pgd; } pgd_t;
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# else /* CONFIG_MMU */
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typedef struct { unsigned long ste[64]; } pmd_t;
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typedef struct { pmd_t pue[1]; } pud_t;
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typedef struct { pud_t pge[1]; } pgd_t;
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# endif /* CONFIG_MMU */
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# define pte_val(x) ((x).pte)
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# define pgprot_val(x) ((x).pgprot)
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# ifdef CONFIG_MMU
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# define pmd_val(x) ((x).pmd)
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# define pgd_val(x) ((x).pgd)
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# else /* CONFIG_MMU */
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# define pmd_val(x) ((x).ste[0])
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# define pud_val(x) ((x).pue[0])
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# define pgd_val(x) ((x).pge[0])
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# endif /* CONFIG_MMU */
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# define __pte(x) ((pte_t) { (x) })
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# define __pmd(x) ((pmd_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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/**
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* Conversions for virtual address, physical address, pfn, and struct
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* page are defined in the following files.
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*
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* virt -+
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* | asm-microblaze/page.h
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* phys -+
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* | linux/pfn.h
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* pfn -+
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* | asm-generic/memory_model.h
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* page -+
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*
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*/
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extern unsigned long max_low_pfn;
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extern unsigned long min_low_pfn;
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extern unsigned long max_pfn;
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extern unsigned long memory_start;
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extern unsigned long memory_end;
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extern unsigned long memory_size;
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extern int page_is_ram(unsigned long pfn);
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# define phys_to_pfn(phys) (PFN_DOWN(phys))
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# define pfn_to_phys(pfn) (PFN_PHYS(pfn))
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# define virt_to_pfn(vaddr) (phys_to_pfn((__pa(vaddr))))
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# define pfn_to_virt(pfn) __va(pfn_to_phys((pfn)))
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# ifdef CONFIG_MMU
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# define virt_to_page(kaddr) (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT))
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# define page_to_virt(page) __va(page_to_pfn(page) << PAGE_SHIFT)
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# define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
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# else /* CONFIG_MMU */
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# define virt_to_page(vaddr) (pfn_to_page(virt_to_pfn(vaddr)))
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# define page_to_virt(page) (pfn_to_virt(page_to_pfn(page)))
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# define page_to_phys(page) (pfn_to_phys(page_to_pfn(page)))
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# define page_to_bus(page) (page_to_phys(page))
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# define phys_to_page(paddr) (pfn_to_page(phys_to_pfn(paddr)))
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# endif /* CONFIG_MMU */
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# ifndef CONFIG_MMU
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# define pfn_valid(pfn) (((pfn) >= min_low_pfn) && \
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((pfn) <= (min_low_pfn + max_mapnr)))
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# define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT)
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# else /* CONFIG_MMU */
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# define ARCH_PFN_OFFSET (memory_start >> PAGE_SHIFT)
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# define pfn_valid(pfn) ((pfn) < (max_mapnr + ARCH_PFN_OFFSET))
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# define VALID_PAGE(page) ((page - mem_map) < max_mapnr)
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# endif /* CONFIG_MMU */
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# endif /* __ASSEMBLY__ */
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#define virt_addr_valid(vaddr) (pfn_valid(virt_to_pfn(vaddr)))
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# ifndef CONFIG_MMU
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# define __pa(vaddr) ((unsigned long) (vaddr))
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# define __va(paddr) ((void *) (paddr))
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# else /* CONFIG_MMU */
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# define __pa(x) __virt_to_phys((unsigned long)(x))
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# define __va(x) ((void *)__phys_to_virt((unsigned long)(x)))
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# endif /* CONFIG_MMU */
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/* Convert between virtual and physical address for MMU. */
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/* Handle MicroBlaze processor with virtual memory. */
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#ifndef CONFIG_MMU
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#define __virt_to_phys(addr) addr
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#define __phys_to_virt(addr) addr
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#define tophys(rd, rs) addik rd, rs, 0
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#define tovirt(rd, rs) addik rd, rs, 0
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#else
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#define __virt_to_phys(addr) \
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((addr) + CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
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#define __phys_to_virt(addr) \
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((addr) + CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
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#define tophys(rd, rs) \
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addik rd, rs, (CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
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#define tovirt(rd, rs) \
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addik rd, rs, (CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
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#endif /* CONFIG_MMU */
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#define TOPHYS(addr) __virt_to_phys(addr)
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#ifdef CONFIG_MMU
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#ifdef CONFIG_CONTIGUOUS_PAGE_ALLOC
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#define WANT_PAGE_VIRTUAL 1 /* page alloc 2 relies on this */
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#endif
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#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
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VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
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#endif /* CONFIG_MMU */
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#endif /* __KERNEL__ */
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#include <asm-generic/memory_model.h>
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#include <asm-generic/getorder.h>
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#endif /* _ASM_MICROBLAZE_PAGE_H */
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