| /* |
| * 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 |
| |
| #ifdef __KERNEL__ |
| |
| #include <asm/processor.h> |
| #include <asm/types.h> |
| |
| /* |
| * Fixed TLB translations in the processor. |
| */ |
| |
| #define XCHAL_KSEG_CACHED_VADDR 0xd0000000 |
| #define XCHAL_KSEG_BYPASS_VADDR 0xd8000000 |
| #define XCHAL_KSEG_PADDR 0x00000000 |
| #define XCHAL_KSEG_SIZE 0x08000000 |
| |
| /* |
| * PAGE_SHIFT determines the page size |
| * PAGE_ALIGN(x) aligns the pointer to the (next) page boundary |
| */ |
| |
| #define PAGE_SHIFT 12 |
| #define PAGE_SIZE (__XTENSA_UL_CONST(1) << PAGE_SHIFT) |
| #define PAGE_MASK (~(PAGE_SIZE-1)) |
| #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE - 1) & PAGE_MASK) |
| |
| #define PAGE_OFFSET XCHAL_KSEG_CACHED_VADDR |
| #define MAX_MEM_PFN XCHAL_KSEG_SIZE |
| #define PGTABLE_START 0x80000000 |
| |
| #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 |
| * 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/page.h> |
| |
| #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) |
| #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) |
| |
| #define WANT_PAGE_VIRTUAL |
| |
| |
| #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 /* __KERNEL__ */ |
| #endif /* _XTENSA_PAGE_H */ |