Viewing file:  page.h (3.22 KB) -rw-r--r--
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#ifndef _CRIS_PAGE_H
#define _CRIS_PAGE_H
#include <linux/config.h>
#include <asm/mmu.h>
/* PAGE_SHIFT determines the page size */
#define PAGE_SHIFT 13
#define PAGE_SIZE (1UL << PAGE_SHIFT)
#define PAGE_MASK (~(PAGE_SIZE-1))
#ifdef __KERNEL__
#define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
#define copy_page(to,from) memcpy((void *)(to), (void *)(from), PAGE_SIZE)
#define clear_user_page(page, vaddr) clear_page(page)
#define copy_user_page(to, from, vaddr) copy_page(to, from)
#define STRICT_MM_TYPECHECKS
#ifdef STRICT_MM_TYPECHECKS
/*
* These are used to make use of C type-checking..
*/
typedef struct { unsigned long pte; } pte_t;
typedef struct { unsigned long pmd; } pmd_t;
typedef struct { unsigned long pgd; } pgd_t;
typedef struct { unsigned long pgprot; } pgprot_t;
#define pte_val(x) ((x).pte)
#define pmd_val(x) ((x).pmd)
#define pgd_val(x) ((x).pgd)
#define pgprot_val(x) ((x).pgprot)
#define __pte(x) ((pte_t) { (x) } )
#define __pmd(x) ((pmd_t) { (x) } )
#define __pgd(x) ((pgd_t) { (x) } )
#define __pgprot(x) ((pgprot_t) { (x) } )
#else
/*
* .. while these make it easier on the compiler
*/
typedef unsigned long pte_t;
typedef unsigned long pmd_t;
typedef unsigned long pgd_t;
typedef unsigned long pgprot_t;
#define pte_val(x) (x)
#define pmd_val(x) (x)
#define pgd_val(x) (x)
#define pgprot_val(x) (x)
#define __pte(x) (x)
#define __pmd(x) (x)
#define __pgd(x) (x)
#define __pgprot(x) (x)
#endif
/* to align the pointer to the (next) page boundary */
#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
/* This handles the memory map.. */
#ifdef CONFIG_CRIS_LOW_MAP
#define PAGE_OFFSET KSEG_6 /* kseg_6 is mapped to physical ram */
#else
#define PAGE_OFFSET KSEG_C /* kseg_c is mapped to physical ram */
#endif
#ifndef __ASSEMBLY__
#define BUG() do { \
printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); \
} while (0)
#define PAGE_BUG(page) do { \
BUG(); \
} while (0)
#endif /* __ASSEMBLY__ */
/* macros to convert between really physical and virtual addresses
* by stripping a selected bit, we can convert between KSEG_x and 0x40000000 where
* the DRAM really resides
*/
#ifdef CONFIG_CRIS_LOW_MAP
/* we have DRAM virtually at 0x6 */
#define __pa(x) ((unsigned long)(x) & 0xdfffffff)
#define __va(x) ((void *)((unsigned long)(x) | 0x20000000))
#else
/* we have DRAM virtually at 0xc */
#define __pa(x) ((unsigned long)(x) & 0x7fffffff)
#define __va(x) ((void *)((unsigned long)(x) | 0x80000000))
#endif
/* to index into the page map. our pages all start at physical addr PAGE_OFFSET so
* we can let the map start there. notice that we subtract PAGE_OFFSET because
* we start our mem_map there - in other ports they map mem_map physically and
* use __pa instead. in our system both the physical and virtual address of DRAM
* is too high to let mem_map start at 0, so we do it this way instead (similar
* to arm and m68k I think)
*/
#define virt_to_page(kaddr) (mem_map + (((unsigned long)kaddr - PAGE_OFFSET) >> PAGE_SHIFT))
#define VALID_PAGE(page) ((page - mem_map) < max_mapnr)
/* from linker script */
extern unsigned long dram_start, dram_end;
#endif /* __KERNEL__ */
#endif /* _CRIS_PAGE_H */
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