/* * 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 - 2007 Tensilica Inc. */ #ifndef _XTENSA_PAGE_H #define _XTENSA_PAGE_H #include <asm/processor.h> #include <asm/types.h> #include <asm/cache.h> #include <platform/hardware.h> #include <asm/kmem_layout.h> /* * PAGE_SHIFT determines the page size */ #define PAGE_SHIFT 12 #define PAGE_SIZE (__XTENSA_UL_CONST(1) << PAGE_SHIFT) #define PAGE_MASK (~(PAGE_SIZE-1)) #ifdef CONFIG_MMU #define PAGE_OFFSET XCHAL_KSEG_CACHED_VADDR #define PHYS_OFFSET XCHAL_KSEG_PADDR #define MAX_LOW_PFN (PHYS_PFN(XCHAL_KSEG_PADDR) + \ PHYS_PFN(XCHAL_KSEG_SIZE)) #else #define PAGE_OFFSET PLATFORM_DEFAULT_MEM_START #define PHYS_OFFSET PLATFORM_DEFAULT_MEM_START #define MAX_LOW_PFN PHYS_PFN(0xfffffffful) #endif #define PGTABLE_START 0x80000000 /* * Cache aliasing: * * If the cache size for one way is greater than the page size, we have to * deal with cache aliasing. The cache index is wider than the page size: * * | |cache| cache index * | pfn |off| virtual address * |xxxx:X|zzz| * | : | | * | \ / | | * |trans.| | * | / \ | | * |yyyy:Y|zzz| physical address * * When the page number is translated to the physical page address, the lowest * bit(s) (X) that are part of the cache index are also translated (Y). * If this translation changes bit(s) (X), the cache index is also afected, * thus resulting in a different cache line than before. * The kernel does not provide a mechanism to ensure that the page color * (represented by this bit) remains the same when allocated or when pages * are remapped. When user pages are mapped into kernel space, the color of * the page might also change. * * We use the address space VMALLOC_END ... VMALLOC_END + DCACHE_WAY_SIZE * 2 * to temporarily map a patch so we can match the color. */ #if DCACHE_WAY_SIZE > PAGE_SIZE # define DCACHE_ALIAS_ORDER (DCACHE_WAY_SHIFT - PAGE_SHIFT) # define DCACHE_ALIAS_MASK (PAGE_MASK & (DCACHE_WAY_SIZE - 1)) # define DCACHE_ALIAS(a) (((a) & DCACHE_ALIAS_MASK) >> PAGE_SHIFT) # define DCACHE_ALIAS_EQ(a,b) ((((a) ^ (b)) & DCACHE_ALIAS_MASK) == 0) #else # define DCACHE_ALIAS_ORDER 0 # define DCACHE_ALIAS(a) ((void)(a), 0) #endif #define DCACHE_N_COLORS (1 << DCACHE_ALIAS_ORDER) #if ICACHE_WAY_SIZE > PAGE_SIZE # define ICACHE_ALIAS_ORDER (ICACHE_WAY_SHIFT - PAGE_SHIFT) # define ICACHE_ALIAS_MASK (PAGE_MASK & (ICACHE_WAY_SIZE - 1)) # define ICACHE_ALIAS(a) (((a) & ICACHE_ALIAS_MASK) >> PAGE_SHIFT) # define ICACHE_ALIAS_EQ(a,b) ((((a) ^ (b)) & ICACHE_ALIAS_MASK) == 0) #else # define ICACHE_ALIAS_ORDER 0 #endif #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; typedef struct page *pgtable_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 * Use 'nsau' instructions if supported by the processor or the generic version. */ #if XCHAL_HAVE_NSA static inline __attribute_const__ int get_order(unsigned long size) { int lz; asm ("nsau %0, %1" : "=r" (lz) : "r" ((size - 1) >> PAGE_SHIFT)); return 32 - lz; } #else # include <asm-generic/getorder.h> #endif struct page; struct vm_area_struct; 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 defined(CONFIG_MMU) && DCACHE_WAY_SIZE > PAGE_SIZE extern void clear_page_alias(void *vaddr, unsigned long paddr); extern void copy_page_alias(void *to, void *from, unsigned long to_paddr, unsigned long from_paddr); #define clear_user_highpage clear_user_highpage void clear_user_highpage(struct page *page, unsigned long vaddr); #define __HAVE_ARCH_COPY_USER_HIGHPAGE void copy_user_highpage(struct page *to, struct page *from, unsigned long vaddr, struct vm_area_struct *vma); #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 ARCH_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) #ifdef CONFIG_MMU static inline unsigned long ___pa(unsigned long va) { unsigned long off = va - PAGE_OFFSET; if (off >= XCHAL_KSEG_SIZE) off -= XCHAL_KSEG_SIZE; return off + PHYS_OFFSET; } #define __pa(x) ___pa((unsigned long)(x)) #else #define __pa(x) \ ((unsigned long) (x) - PAGE_OFFSET + PHYS_OFFSET) #endif #define __va(x) \ ((void *)((unsigned long) (x) - PHYS_OFFSET + PAGE_OFFSET)) #define pfn_valid(pfn) \ ((pfn) >= ARCH_PFN_OFFSET && ((pfn) - ARCH_PFN_OFFSET) < max_mapnr) #ifdef CONFIG_DISCONTIGMEM # 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) #endif /* __ASSEMBLY__ */ #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) #include <asm-generic/memory_model.h> #endif /* _XTENSA_PAGE_H */
Name | Type | Size | Permission | Actions |
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Kbuild | File | 685 B | 0644 |
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asm-offsets.h | File | 35 B | 0644 |
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asm-uaccess.h | File | 4.11 KB | 0644 |
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asmmacro.h | File | 2.76 KB | 0644 |
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atomic.h | File | 7.38 KB | 0644 |
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barrier.h | File | 542 B | 0644 |
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bitops.h | File | 5.08 KB | 0644 |
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bootparam.h | File | 1.37 KB | 0644 |
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bugs.h | File | 451 B | 0644 |
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cache.h | File | 969 B | 0644 |
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cacheasm.h | File | 3.77 KB | 0644 |
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cacheflush.h | File | 5.76 KB | 0644 |
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checksum.h | File | 6 KB | 0644 |
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cmpxchg.h | File | 3.9 KB | 0644 |
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coprocessor.h | File | 5.05 KB | 0644 |
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current.h | File | 675 B | 0644 |
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delay.h | File | 1.63 KB | 0644 |
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dma-mapping.h | File | 855 B | 0644 |
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dma.h | File | 1.79 KB | 0644 |
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elf.h | File | 5.75 KB | 0644 |
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fixmap.h | File | 2.5 KB | 0644 |
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flat.h | File | 686 B | 0644 |
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ftrace.h | File | 979 B | 0644 |
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futex.h | File | 2.59 KB | 0644 |
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highmem.h | File | 2.33 KB | 0644 |
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hw_breakpoint.h | File | 1.45 KB | 0644 |
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hw_irq.h | File | 320 B | 0644 |
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initialize_mmu.h | File | 4.58 KB | 0644 |
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io.h | File | 2.09 KB | 0644 |
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irq.h | File | 1.46 KB | 0644 |
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irqflags.h | File | 1.99 KB | 0644 |
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kmem_layout.h | File | 2.07 KB | 0644 |
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mmu.h | File | 462 B | 0644 |
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mmu_context.h | File | 3.62 KB | 0644 |
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module.h | File | 525 B | 0644 |
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mxregs.h | File | 1.3 KB | 0644 |
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nommu_context.h | File | 602 B | 0644 |
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page.h | File | 5.69 KB | 0644 |
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pci-bridge.h | File | 2.16 KB | 0644 |
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pci.h | File | 1.37 KB | 0644 |
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perf_event.h | File | 108 B | 0644 |
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pgalloc.h | File | 1.84 KB | 0644 |
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pgtable.h | File | 14.89 KB | 0644 |
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platform.h | File | 1.75 KB | 0644 |
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processor.h | File | 7.44 KB | 0644 |
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ptrace.h | File | 3.74 KB | 0644 |
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regs.h | File | 3.87 KB | 0644 |
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segment.h | File | 376 B | 0644 |
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serial.h | File | 443 B | 0644 |
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shmparam.h | File | 561 B | 0644 |
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signal.h | File | 502 B | 0644 |
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smp.h | File | 967 B | 0644 |
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spinlock.h | File | 4.6 KB | 0644 |
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spinlock_types.h | File | 412 B | 0644 |
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stacktrace.h | File | 1.13 KB | 0644 |
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string.h | File | 2.65 KB | 0644 |
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switch_to.h | File | 601 B | 0644 |
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syscall.h | File | 982 B | 0644 |
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sysmem.h | File | 426 B | 0644 |
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thread_info.h | File | 3.62 KB | 0644 |
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timex.h | File | 1.79 KB | 0644 |
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tlb.h | File | 1.1 KB | 0644 |
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tlbflush.h | File | 5.53 KB | 0644 |
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traps.h | File | 1.87 KB | 0644 |
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types.h | File | 501 B | 0644 |
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uaccess.h | File | 8.67 KB | 0644 |
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ucontext.h | File | 540 B | 0644 |
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unaligned.h | File | 864 B | 0644 |
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unistd.h | File | 639 B | 0644 |
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user.h | File | 507 B | 0644 |
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vectors.h | File | 4.05 KB | 0644 |
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vga.h | File | 434 B | 0644 |
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