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Diffstat (limited to 'include/asm-xtensa/page.h')
| -rw-r--r-- | include/asm-xtensa/page.h | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/include/asm-xtensa/page.h b/include/asm-xtensa/page.h new file mode 100644 index 00000000000..b495e5b5a94 --- /dev/null +++ b/include/asm-xtensa/page.h @@ -0,0 +1,133 @@ +/* + * 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 + */ + +extern __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 */ |