cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

page.h (2887B)

      1/*
      2 * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>
      3 * Copyright (C) 2004 Microtronix Datacom Ltd.
      4 *
      5 * MMU support based on asm/page.h from mips which is:
      6 *
      7 * Copyright (C) 1994 - 1999, 2000, 03 Ralf Baechle
      8 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
      9 *
     10 * This file is subject to the terms and conditions of the GNU General Public
     11 * License.  See the file "COPYING" in the main directory of this archive
     12 * for more details.
     13 */
     14
     15#ifndef _ASM_NIOS2_PAGE_H
     16#define _ASM_NIOS2_PAGE_H
     17
     18#include <linux/pfn.h>
     19#include <linux/const.h>
     20
     21/*
     22 * PAGE_SHIFT determines the page size
     23 */
     24#define PAGE_SHIFT	12
     25#define PAGE_SIZE	(_AC(1, UL) << PAGE_SHIFT)
     26#define PAGE_MASK	(~(PAGE_SIZE - 1))
     27
     28/*
     29 * PAGE_OFFSET -- the first address of the first page of memory.
     30 */
     31#define PAGE_OFFSET	\
     32	(CONFIG_NIOS2_MEM_BASE + CONFIG_NIOS2_KERNEL_REGION_BASE)
     33
     34#ifndef __ASSEMBLY__
     35
     36/*
     37 * This gives the physical RAM offset.
     38 */
     39#define PHYS_OFFSET		CONFIG_NIOS2_MEM_BASE
     40
     41/*
     42 * It's normally defined only for FLATMEM config but it's
     43 * used in our early mem init code for all memory models.
     44 * So always define it.
     45 */
     46#define ARCH_PFN_OFFSET		PFN_UP(PHYS_OFFSET)
     47
     48#define clear_page(page)	memset((page), 0, PAGE_SIZE)
     49#define copy_page(to, from)	memcpy((to), (from), PAGE_SIZE)
     50
     51struct page;
     52
     53extern void clear_user_page(void *addr, unsigned long vaddr, struct page *page);
     54extern void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
     55				struct page *to);
     56
     57/*
     58 * These are used to make use of C type-checking.
     59 */
     60typedef struct page *pgtable_t;
     61typedef struct { unsigned long pte; } pte_t;
     62typedef struct { unsigned long pgd; } pgd_t;
     63typedef struct { unsigned long pgprot; } pgprot_t;
     64
     65#define pte_val(x)	((x).pte)
     66#define pgd_val(x)	((x).pgd)
     67#define pgprot_val(x)	((x).pgprot)
     68
     69#define __pte(x)	((pte_t) { (x) })
     70#define __pgd(x)	((pgd_t) { (x) })
     71#define __pgprot(x)	((pgprot_t) { (x) })
     72
     73extern unsigned long memory_start;
     74extern unsigned long memory_end;
     75extern unsigned long memory_size;
     76
     77extern struct page *mem_map;
     78
     79# define __pa(x)		\
     80	((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
     81# define __va(x)		\
     82	((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
     83
     84#define page_to_virt(page)	\
     85	((void *)(((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET)
     86
     87# define pfn_to_kaddr(pfn)	__va((pfn) << PAGE_SHIFT)
     88
     89static inline bool pfn_valid(unsigned long pfn)
     90{
     91	/* avoid <linux/mm.h> include hell */
     92	extern unsigned long max_mapnr;
     93	unsigned long pfn_offset = ARCH_PFN_OFFSET;
     94
     95	return pfn >= pfn_offset && pfn < max_mapnr;
     96}
     97
     98# define virt_to_page(vaddr)	pfn_to_page(PFN_DOWN(virt_to_phys(vaddr)))
     99# define virt_addr_valid(vaddr)	pfn_valid(PFN_DOWN(virt_to_phys(vaddr)))
    100
    101# define VM_DATA_DEFAULT_FLAGS	VM_DATA_FLAGS_NON_EXEC
    102
    103#include <asm-generic/memory_model.h>
    104
    105#include <asm-generic/getorder.h>
    106
    107#endif /* !__ASSEMBLY__ */
    108
    109#endif /* _ASM_NIOS2_PAGE_H */